{"id":758,"date":"2026-05-27T06:36:59","date_gmt":"2026-05-27T06:36:59","guid":{"rendered":"https:\/\/senopeptide.com\/?p=758"},"modified":"2026-05-27T08:04:38","modified_gmt":"2026-05-27T08:04:38","slug":"sont-des-peptides-steroides","status":"publish","type":"post","link":"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/","title":{"rendered":"Les peptides sont-ils des st\u00e9ro\u00efdes ?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Peptides_vs_Steroids_Explained_Simply\" >Les peptides et les st\u00e9ro\u00efdes : tout ce qu'il faut savoir<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Brielf_Overview\" >Brief aper\u00e7u<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#The_Short_Answer\" >La r\u00e9ponse en bref<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#No_%E2%80%94_peptides_are_not_steroids\" >Non, les peptides ne sont pas des st\u00e9ro\u00efdes.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#entirely_different_molecular_families\" >des familles mol\u00e9culaires totalement diff\u00e9rentes.<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#What_Are_Peptides\" >Que sont les peptides ?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#amino_acids\" >acides amin\u00e9s<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#peptide_bonds\" >liaisons peptidiques<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#What_Are_Steroids\" >Que sont les st\u00e9ro\u00efdes ?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#cholesterol-like_ring_structures\" >des structures cycliques de type cholest\u00e9rol.<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#The_Biggest_Difference\" >La plus grande diff\u00e9rence<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Peptides_are\" >Les peptides sont :<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Steroids_are\" >Les st\u00e9ro\u00efdes sont :<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Analogy\" >Analogie<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Why_People_Confuse_Peptides_and_Steroids\" >Pourquoi les gens confondent les peptides et les st\u00e9ro\u00efdes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Peptides_vs_Steroids_Molecular_Structure\" >Peptides et st\u00e9ro\u00efdes : structure mol\u00e9culaire<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Peptides\" >Peptides<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Peptide_Structure\" >Structure peptidique<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Steroids\" >St\u00e9ro\u00efdes<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Steroid_Structure\" >Structure des st\u00e9ro\u00efdes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Why_Structure_Changes_Everything\" >Pourquoi la structure change tout<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Peptides_vs_Steroids_How_They_Work\" >Peptides ou st\u00e9ro\u00efdes : comment fonctionnent-ils ?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Peptides-2\" >Peptides<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Steroids-2\" >St\u00e9ro\u00efdes<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Analogy-2\" >Analogie<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Peptides_are_like\" >Les peptides, c'est un peu comme :<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Steroids_are_more_like\" >Les st\u00e9ro\u00efdes, c'est plut\u00f4t :<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Why_Steroids_Often_Have_Longer_Effects\" >Pourquoi les st\u00e9ro\u00efdes ont-ils souvent des effets plus durables ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Why_Peptides_Often_Act_Faster\" >Pourquoi les peptides agissent-ils souvent plus rapidement ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Peptides_vs_Steroids_Manufacturing\" >Peptides et st\u00e9ro\u00efdes : fabrication<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Peptide_Manufacturing\" >Fabrication de peptides<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Solid-Phase_Peptide_Synthesis_SPPS\" >Synth\u00e8se de peptides en phase solide (SPPS)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Steroid_Manufacturing\" >Fabrication de st\u00e9ro\u00efdes<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Why_Peptides_Are_More_Fragile\" >Pourquoi les peptides sont-ils plus fragiles ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Why_Steroids_Are_Often_More_Stable\" >Pourquoi les st\u00e9ro\u00efdes sont souvent plus stables<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Peptides_vs_Steroids_in_Biological_Systems\" >Les peptides face aux st\u00e9ro\u00efdes dans les syst\u00e8mes biologiques<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Peptides-3\" >Peptides<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Steroids-3\" >St\u00e9ro\u00efdes<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-39\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#What_Most_Articles_Fail_to_Explain\" >Ce que la plupart des articles omettent d'expliquer<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-40\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#communication_architecture\" >architecture de communication.<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-41\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Peptides_Communication_Signals\" >Les peptides = signaux de communication<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-42\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Steroids_Regulatory_Controllers\" >St\u00e9ro\u00efdes = r\u00e9gulateurs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-43\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Simple_Analogy\" >Analogie simple<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-44\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Why_Researchers_Study_Both\" >Pourquoi les chercheurs \u00e9tudient-ils les deux ?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-45\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#peptides\" >peptides<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-46\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#steroids\" >st\u00e9ro\u00efdes<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-47\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Are_Any_Hormones_Peptides\" >Certaines hormones sont-elles des peptides ?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-48\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Important_Clarification\" >Pr\u00e9cision importante<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-49\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Hormones_are_a_function_category\" >Les hormones constituent une cat\u00e9gorie fonctionnelle.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-50\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Peptides_and_steroids_are_chemistry_categories\" >Les peptides et les st\u00e9ro\u00efdes sont des cat\u00e9gories de compos\u00e9s chimiques.<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-51\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Examples\" >Exemples<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-52\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Why_This_Matters_in_Research\" >Pourquoi cela est-il important dans le domaine de la recherche ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-53\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Scientific_Perspective\" >Point de vue scientifique<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-54\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Summary\" >R\u00e9sum\u00e9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-55\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#FAQ\" >FAQ<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-56\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Are_peptides_considered_steroids\" >Les peptides sont-ils consid\u00e9r\u00e9s comme des st\u00e9ro\u00efdes ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-57\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#What_are_peptides_made_of\" >De quoi sont compos\u00e9s les peptides ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-58\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#What_are_steroids_made_of\" >De quoi sont compos\u00e9s les st\u00e9ro\u00efdes ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-59\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Do_peptides_enter_cells_directly_like_steroids\" >Les peptides p\u00e9n\u00e8trent-ils directement dans les cellules, comme les st\u00e9ro\u00efdes ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-60\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#Why_are_peptides_more_fragile_than_steroids\" >Pourquoi les peptides sont-ils plus instables que les st\u00e9ro\u00efdes ?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-61\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/#References\" >R\u00e9f\u00e9rences<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 data-section-id=\"16rib9b\" data-start=\"27\" data-end=\"69\"><span class=\"ez-toc-section\" id=\"Peptides_vs_Steroids_Explained_Simply\"><\/span>Les peptides et les st\u00e9ro\u00efdes : tout ce qu'il faut savoir<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"70\" data-end=\"129\"><em data-start=\"70\" data-end=\"129\">Une approche ax\u00e9e sur la biologie mol\u00e9culaire et la signalisation biochimique<\/em><\/p>\n<hr data-start=\"131\" data-end=\"134\" \/>\n<h2 data-section-id=\"ul0zg4\" data-start=\"136\" data-end=\"154\"><span class=\"ez-toc-section\" id=\"Brielf_Overview\"><\/span>Brief aper\u00e7u<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<blockquote>\n<p data-start=\"156\" data-end=\"714\"><a href=\"https:\/\/senopeptide.com\/fr\/products\/\" data-internallinksmanager029f6b8e52c=\"1\" title=\"SENO Research-Grade Peptides Products Overseas Wholesale\">Peptides<\/a> Les peptides et les st\u00e9ro\u00efdes sont des types de mol\u00e9cules biologiques totalement diff\u00e9rents. Les peptides sont de courtes cha\u00eenes d'acides amin\u00e9s reli\u00e9s par des liaisons peptidiques, tandis que les st\u00e9ro\u00efdes sont des mol\u00e9cules \u00e0 base de lipides d\u00e9riv\u00e9es de structures cholest\u00e9riques. Les peptides agissent principalement par le biais de la signalisation des r\u00e9cepteurs \u00e0 la surface des cellules, tandis que les st\u00e9ro\u00efdes p\u00e9n\u00e8trent souvent directement dans les cellules et influencent l'expression g\u00e9n\u00e9tique \u00e0 l'int\u00e9rieur du noyau. Bien que les deux participent aux syst\u00e8mes de signalisation biologique, leur chimie, leurs m\u00e9thodes de production, leur comportement de transport et leurs m\u00e9canismes mol\u00e9culaires sont fondamentalement diff\u00e9rents.<\/p>\n<\/blockquote>\n<p data-start=\"156\" data-end=\"714\">OBTENIR LES DERNI\u00c8RES INFORMATIONS\u00a0<a href=\"https:\/\/senopeptide.com\/fr\/the-latest-research-peptide-products-and-prices-list\/\">LISTE DES PRODUITS ET DES PRIX<\/a><\/p>\n<hr data-start=\"716\" data-end=\"719\" \/>\n<h2 data-section-id=\"1nbyhjl\" data-start=\"721\" data-end=\"739\"><span class=\"ez-toc-section\" id=\"The_Short_Answer\"><\/span>La r\u00e9ponse en bref<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-section-id=\"13ix5km\" data-start=\"741\" data-end=\"775\"><span class=\"ez-toc-section\" id=\"No_%E2%80%94_peptides_are_not_steroids\"><\/span>Non, les peptides ne sont pas des st\u00e9ro\u00efdes.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"777\" data-end=\"822\">C'est l'une des id\u00e9es re\u00e7ues les plus r\u00e9pandues dans :<\/p>\n<ul data-start=\"823\" data-end=\"883\">\n<li data-section-id=\"vp8uyt\" data-start=\"823\" data-end=\"840\">science des peptides<\/li>\n<li data-section-id=\"mj2uoy\" data-start=\"841\" data-end=\"860\">biologie endocrinienne<\/li>\n<li data-section-id=\"1ap9qb5\" data-start=\"861\" data-end=\"883\">recherche biochimique<\/li>\n<\/ul>\n<p data-start=\"885\" data-end=\"962\">Cette confusion s'explique par le fait que :<br \/>\nles peptides et les st\u00e9ro\u00efdes peuvent tous deux intervenir dans :<\/p>\n<ul data-start=\"963\" data-end=\"1049\">\n<li data-section-id=\"64sltz\" data-start=\"963\" data-end=\"983\">voies de signalisation<\/li>\n<li data-section-id=\"1sjidd9\" data-start=\"984\" data-end=\"1003\">syst\u00e8mes endocriniens<\/li>\n<li data-section-id=\"12m7819\" data-start=\"1004\" data-end=\"1023\">r\u00e9gulation de la croissance<\/li>\n<li data-section-id=\"1ahw97i\" data-start=\"1024\" data-end=\"1049\">communication m\u00e9tabolique<\/li>\n<\/ul>\n<p data-start=\"1051\" data-end=\"1082\">Mais d'un point de vue chimique,<br \/>\nils appartiennent \u00e0 :<\/p>\n<h3 data-section-id=\"1ecl4a0\" data-start=\"1083\" data-end=\"1124\"><span class=\"ez-toc-section\" id=\"entirely_different_molecular_families\"><\/span>des familles mol\u00e9culaires totalement diff\u00e9rentes.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<hr data-start=\"1126\" data-end=\"1129\" \/>\n<h2 data-section-id=\"15sdo7j\" data-start=\"1131\" data-end=\"1151\"><span class=\"ez-toc-section\" id=\"What_Are_Peptides\"><\/span>Que sont les peptides ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"1153\" data-end=\"1166\">Les peptides sont :<\/p>\n<ul data-start=\"1167\" data-end=\"1193\">\n<li data-section-id=\"y239dt\" data-start=\"1167\" data-end=\"1193\">cha\u00eenes d'acides amin\u00e9s courtes.<\/li>\n<\/ul>\n<p data-start=\"1195\" data-end=\"1215\">Ils sont compos\u00e9s de :<\/p>\n<h3 data-section-id=\"9c5wzh\" data-start=\"1216\" data-end=\"1230\"><span class=\"ez-toc-section\" id=\"amino_acids\"><\/span>acides amin\u00e9s<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"1232\" data-end=\"1250\">connect\u00e9 via :<\/p>\n<h3 data-section-id=\"1edgwfc\" data-start=\"1251\" data-end=\"1267\"><span class=\"ez-toc-section\" id=\"peptide_bonds\"><\/span>liaisons peptidiques<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"1269\" data-end=\"1306\"><span class=\"inline-block align-middle\"><span class=\"katex\"><span class=\"katex-mathml\">Acide amin\u00e9 + acide amin\u00e9 \u2192 peptide Acide amin\u00e9 + acide amin\u00e9 \u2192 peptide<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">A<\/span><span class=\"mord mathnormal\">min<\/span><span class=\"mord mathnormal\">o<\/span><span class=\"mspace\">\u00a0<\/span><span class=\"mord mathnormal\">A<\/span><span class=\"mord mathnormal\">c<\/span><span class=\"mord mathnormal\">i<\/span><span class=\"mord mathnormal\">d<\/span><span class=\"mbin\">+<\/span><\/span><span class=\"base\"><span class=\"mord mathnormal\">A<\/span><span class=\"mord mathnormal\">min<\/span><span class=\"mord mathnormal\">o<\/span><span class=\"mspace\">\u00a0<\/span><span class=\"mord mathnormal\">A<\/span><span class=\"mord mathnormal\">c<\/span><span class=\"mord mathnormal\">i<\/span><span class=\"mord mathnormal\">d<\/span><span class=\"mrel\">\u2192<\/span><\/span><span class=\"base\"><span class=\"mord mathnormal\">P<\/span><span class=\"mord mathnormal\">e<\/span><span class=\"mord mathnormal\">pt<\/span><span class=\"mord mathnormal\">i<\/span><span class=\"mord mathnormal\">d<\/span><span class=\"mord mathnormal\">e<\/span><\/span><\/span><\/span><\/span><\/p>\n<hr data-start=\"1308\" data-end=\"1311\" \/>\n<h2 data-section-id=\"15n8mf8\" data-start=\"1313\" data-end=\"1333\"><span class=\"ez-toc-section\" id=\"What_Are_Steroids\"><\/span>Que sont les st\u00e9ro\u00efdes ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"1335\" data-end=\"1348\">Les st\u00e9ro\u00efdes sont :<\/p>\n<ul data-start=\"1349\" data-end=\"1374\">\n<li data-section-id=\"wzle6v\" data-start=\"1349\" data-end=\"1374\">mol\u00e9cules d\u00e9riv\u00e9es des lipides<\/li>\n<\/ul>\n<p data-start=\"1376\" data-end=\"1387\">compos\u00e9 de :<\/p>\n<h3 data-section-id=\"lc878n\" data-start=\"1388\" data-end=\"1424\"><span class=\"ez-toc-section\" id=\"cholesterol-like_ring_structures\"><\/span>des structures cycliques de type cholest\u00e9rol.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"1426\" data-end=\"1456\">Leur structure de base comprend :<\/p>\n<ul data-start=\"1457\" data-end=\"1483\">\n<li data-section-id=\"7a6ztn\" data-start=\"1457\" data-end=\"1483\">quatre anneaux de carbone fusionn\u00e9s.<\/li>\n<\/ul>\n<p data-start=\"1485\" data-end=\"1522\"><span class=\"inline-block align-middle\"><span class=\"katex\"><span class=\"katex-mathml\">Noyau Steroid = 4 anneaux de carbone fusionn\u00e9sNoyau Steroid = 4 anneaux de carbone fusionn\u00e9s<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">St<\/span><span class=\"mord mathnormal\">ero<\/span><span class=\"mord mathnormal\">i<\/span><span class=\"mord mathnormal\">d<\/span><span class=\"mspace\">\u00a0<\/span><span class=\"mord mathnormal\">C<\/span><span class=\"mord mathnormal\">minerai<\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\">4<\/span><span class=\"mspace\">\u00a0<\/span><span class=\"mord mathnormal\">F<\/span><span class=\"mord mathnormal\">u<\/span><span class=\"mord mathnormal\">se<\/span><span class=\"mord mathnormal\">d<\/span><span class=\"mspace\">\u00a0<\/span><span class=\"mord mathnormal\">C<\/span><span class=\"mord mathnormal\">a<\/span><span class=\"mord mathnormal\">r<\/span><span class=\"mord mathnormal\">b<\/span><span class=\"mord mathnormal\">o<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mspace\">\u00a0<\/span><span class=\"mord mathnormal\">R<\/span><span class=\"mord mathnormal\">dans<\/span><span class=\"mord mathnormal\">g<\/span><span class=\"mord mathnormal\">s<\/span><\/span><\/span><\/span><\/span><\/p>\n<hr data-start=\"1524\" data-end=\"1527\" \/>\n<h2 data-section-id=\"11vdkqp\" data-start=\"1529\" data-end=\"1553\"><span class=\"ez-toc-section\" id=\"The_Biggest_Difference\"><\/span>La plus grande diff\u00e9rence<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-section-id=\"fgn5qn\" data-start=\"1555\" data-end=\"1566\"><span class=\"ez-toc-section\" id=\"Peptides_are\"><\/span>Les peptides sont :<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul data-start=\"1572\" data-end=\"1607\">\n<li data-section-id=\"rhrqo2\" data-start=\"1572\" data-end=\"1607\">mol\u00e9cules de signalisation de type prot\u00e9ique.<\/li>\n<\/ul>\n<h3 data-section-id=\"1w0gvac\" data-start=\"1609\" data-end=\"1620\"><span class=\"ez-toc-section\" id=\"Steroids_are\"><\/span>Les st\u00e9ro\u00efdes sont :<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul data-start=\"1626\" data-end=\"1655\">\n<li data-section-id=\"1c7h8yp\" data-start=\"1626\" data-end=\"1655\">hormones lipidiques liposolubles.<\/li>\n<\/ul>\n<hr data-start=\"1657\" data-end=\"1660\" \/>\n<h2 data-section-id=\"2a1ahn\" data-start=\"1662\" data-end=\"1678\"><span class=\"ez-toc-section\" id=\"Analogy\"><\/span>Analogie<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"1680\" data-end=\"1707\">Un peptide, c'est un peu comme :<\/p>\n<ul data-start=\"1708\" data-end=\"1744\">\n<li data-section-id=\"11vbr00\" data-start=\"1708\" data-end=\"1744\">un message num\u00e9rique compos\u00e9 de mots.<\/li>\n<\/ul>\n<p data-start=\"1746\" data-end=\"1769\">Un st\u00e9ro\u00efde, c'est plut\u00f4t :<\/p>\n<ul data-start=\"1770\" data-end=\"1836\">\n<li data-section-id=\"bbi6tz\" data-start=\"1770\" data-end=\"1836\">une cl\u00e9 passe-partout \u00e0 base d'huile permettant d'acc\u00e9der physiquement aux locaux \u00e0 acc\u00e8s restreint.<\/li>\n<\/ul>\n<p data-start=\"1838\" data-end=\"1906\">Les deux transmettent des informations,<br \/>\nmais par le biais de syst\u00e8mes totalement diff\u00e9rents.<\/p>\n<hr data-start=\"1908\" data-end=\"1911\" \/>\n<h2 data-section-id=\"6piysk\" data-start=\"1913\" data-end=\"1955\"><span class=\"ez-toc-section\" id=\"Why_People_Confuse_Peptides_and_Steroids\"><\/span>Pourquoi les gens confondent les peptides et les st\u00e9ro\u00efdes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"1957\" data-end=\"1989\">De nombreux syst\u00e8mes biologiques se recoupent.<\/p>\n<p data-start=\"1991\" data-end=\"2003\">Par exemple :<\/p>\n<ul data-start=\"2004\" data-end=\"2127\">\n<li data-section-id=\"o4sz4d\" data-start=\"2004\" data-end=\"2044\">les deux peuvent influencer la signalisation endocrinienne<\/li>\n<li data-section-id=\"1r31v69\" data-start=\"2045\" data-end=\"2086\">les deux pourraient interagir avec les voies hormonales<\/li>\n<li data-section-id=\"wqfax2\" data-start=\"2087\" data-end=\"2127\">ces deux facteurs peuvent influencer la coordination m\u00e9tabolique<\/li>\n<\/ul>\n<p data-start=\"2129\" data-end=\"2139\">Mais leur :<\/p>\n<ul data-start=\"2140\" data-end=\"2236\">\n<li data-section-id=\"1ml6mmm\" data-start=\"2140\" data-end=\"2151\">chimie<\/li>\n<li data-section-id=\"1qrgxyk\" data-start=\"2152\" data-end=\"2171\">comportement des r\u00e9cepteurs<\/li>\n<li data-section-id=\"1ql7lct\" data-start=\"2172\" data-end=\"2191\">syst\u00e8mes de transport<\/li>\n<li data-section-id=\"uutijo\" data-start=\"2192\" data-end=\"2236\">m\u00e9thodes de production<br \/>\nsont totalement diff\u00e9rentes.<\/li>\n<\/ul>\n<hr data-start=\"2238\" data-end=\"2241\" \/>\n<h2 data-section-id=\"1xyny5h\" data-start=\"2243\" data-end=\"2286\"><span class=\"ez-toc-section\" id=\"Peptides_vs_Steroids_Molecular_Structure\"><\/span>Peptides et st\u00e9ro\u00efdes : structure mol\u00e9culaire<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-section-id=\"fgn5qn\" data-start=\"2288\" data-end=\"2299\"><span class=\"ez-toc-section\" id=\"Peptides\"><\/span>Peptides<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"2301\" data-end=\"2311\">Composition :<\/p>\n<ul data-start=\"2312\" data-end=\"2326\">\n<li data-section-id=\"1l4vzpa\" data-start=\"2312\" data-end=\"2326\">acides amin\u00e9s.<\/li>\n<\/ul>\n<p data-start=\"2328\" data-end=\"2337\">Exemples :<\/p>\n<ul data-start=\"2338\" data-end=\"2376\">\n<li data-section-id=\"eqjz5n\" data-start=\"2338\" data-end=\"2347\">glycine<\/li>\n<li data-section-id=\"168mkss\" data-start=\"2348\" data-end=\"2356\">lysine<\/li>\n<li data-section-id=\"1p42a7l\" data-start=\"2357\" data-end=\"2365\">valine<\/li>\n<li data-section-id=\"xmh309\" data-start=\"2366\" data-end=\"2376\">arginine<\/li>\n<\/ul>\n<hr data-start=\"2378\" data-end=\"2381\" \/>\n<h2 data-section-id=\"1ln1yyy\" data-start=\"2383\" data-end=\"2402\"><span class=\"ez-toc-section\" id=\"Peptide_Structure\"><\/span>Structure peptidique<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"2404\" data-end=\"2422\">Les peptides ressemblent \u00e0 :<\/p>\n<ul data-start=\"2423\" data-end=\"2468\">\n<li data-section-id=\"1bff67q\" data-start=\"2423\" data-end=\"2431\">cha\u00eenes<\/li>\n<li data-section-id=\"1lnh43y\" data-start=\"2432\" data-end=\"2441\">cha\u00eenes<\/li>\n<li data-section-id=\"1qm97vi\" data-start=\"2442\" data-end=\"2468\">c\u00e2bles mol\u00e9culaires repli\u00e9s.<\/li>\n<\/ul>\n<hr data-start=\"2470\" data-end=\"2473\" \/>\n<h3 data-section-id=\"1w0gvac\" data-start=\"2475\" data-end=\"2486\"><span class=\"ez-toc-section\" id=\"Steroids\"><\/span>St\u00e9ro\u00efdes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"2488\" data-end=\"2499\">Con\u00e7u \u00e0 partir de :<\/p>\n<ul data-start=\"2500\" data-end=\"2538\">\n<li data-section-id=\"y8tuuq\" data-start=\"2500\" data-end=\"2538\">squelettes lipidiques d\u00e9riv\u00e9s du cholest\u00e9rol.<\/li>\n<\/ul>\n<p data-start=\"2540\" data-end=\"2549\">Exemples :<\/p>\n<ul data-start=\"2550\" data-end=\"2586\">\n<li data-section-id=\"jx0fmt\" data-start=\"2550\" data-end=\"2564\">testost\u00e9rone<\/li>\n<li data-section-id=\"etrpqz\" data-start=\"2565\" data-end=\"2575\">\u0153strog\u00e8ne<\/li>\n<li data-section-id=\"1wyydjv\" data-start=\"2576\" data-end=\"2586\">cortisol<\/li>\n<\/ul>\n<hr data-start=\"2588\" data-end=\"2591\" \/>\n<h2 data-section-id=\"zase4h\" data-start=\"2593\" data-end=\"2612\"><span class=\"ez-toc-section\" id=\"Steroid_Structure\"><\/span>Structure des st\u00e9ro\u00efdes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"2614\" data-end=\"2632\">Les st\u00e9ro\u00efdes ressemblent \u00e0 :<\/p>\n<ul data-start=\"2633\" data-end=\"2664\">\n<li data-section-id=\"1mnavfd\" data-start=\"2633\" data-end=\"2664\">structures annulaires rigides en carbone.<\/li>\n<\/ul>\n<hr data-start=\"2666\" data-end=\"2669\" \/>\n<h2 data-section-id=\"18f1rup\" data-start=\"2671\" data-end=\"2705\"><span class=\"ez-toc-section\" id=\"Why_Structure_Changes_Everything\"><\/span>Pourquoi la structure change tout<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"2707\" data-end=\"2738\">La structure mol\u00e9culaire d\u00e9termine :<\/p>\n<ul data-start=\"2739\" data-end=\"2843\">\n<li data-section-id=\"h24lfy\" data-start=\"2739\" data-end=\"2751\">solubilit\u00e9<\/li>\n<li data-section-id=\"1x1u6mj\" data-start=\"2752\" data-end=\"2763\">transport<\/li>\n<li data-section-id=\"1y4cp0a\" data-start=\"2764\" data-end=\"2786\">interaction avec les r\u00e9cepteurs<\/li>\n<li data-section-id=\"16wup48\" data-start=\"2787\" data-end=\"2807\">dur\u00e9e de la signalisation<\/li>\n<li data-section-id=\"1jaomn7\" data-start=\"2808\" data-end=\"2820\">m\u00e9tabolisme<\/li>\n<li data-section-id=\"1sb5poo\" data-start=\"2821\" data-end=\"2843\">comportement de d\u00e9gradation<\/li>\n<\/ul>\n<hr data-start=\"2845\" data-end=\"2848\" \/>\n<h2 data-section-id=\"le7mwz\" data-start=\"2850\" data-end=\"2887\"><span class=\"ez-toc-section\" id=\"Peptides_vs_Steroids_How_They_Work\"><\/span>Peptides ou st\u00e9ro\u00efdes : comment fonctionnent-ils ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-section-id=\"fgn5qn\" data-start=\"2889\" data-end=\"2900\"><span class=\"ez-toc-section\" id=\"Peptides-2\"><\/span>Peptides<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"2902\" data-end=\"2924\">La plupart des peptides se lient \u00e0 :<\/p>\n<ul data-start=\"2925\" data-end=\"2950\">\n<li data-section-id=\"hsukrn\" data-start=\"2925\" data-end=\"2950\">r\u00e9cepteurs de surface cellulaire.<\/li>\n<\/ul>\n<p data-start=\"2952\" data-end=\"2974\">Ils se comportent g\u00e9n\u00e9ralement comme suit :<\/p>\n<ul data-start=\"2975\" data-end=\"3007\">\n<li data-section-id=\"1k4ktz9\" data-start=\"2975\" data-end=\"3007\">m\u00e9ssagers de signalisation externes.<\/li>\n<\/ul>\n<hr data-start=\"3009\" data-end=\"3012\" \/>\n<h3><span class=\"ez-toc-section\" id=\"Steroids-2\"><\/span>St\u00e9ro\u00efdes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"3027\" data-end=\"3040\">Les st\u00e9ro\u00efdes sont :<\/p>\n<ul data-start=\"3041\" data-end=\"3057\">\n<li data-section-id=\"ngxo3h\" data-start=\"3041\" data-end=\"3057\">liposoluble.<\/li>\n<\/ul>\n<p data-start=\"3059\" data-end=\"3092\">Ils passent souvent directement par :<\/p>\n<ul data-start=\"3093\" data-end=\"3109\">\n<li data-section-id=\"wvtppe\" data-start=\"3093\" data-end=\"3109\">membranes cellulaires<\/li>\n<\/ul>\n<p data-start=\"3111\" data-end=\"3129\">et interagir avec :<\/p>\n<ul data-start=\"3130\" data-end=\"3175\">\n<li data-section-id=\"83b1vj\" data-start=\"3130\" data-end=\"3155\">r\u00e9cepteurs intracellulaires<\/li>\n<li data-section-id=\"huj21d\" data-start=\"3156\" data-end=\"3175\">r\u00e9cepteurs nucl\u00e9aires<\/li>\n<\/ul>\n<hr data-start=\"3177\" data-end=\"3180\" \/>\n<h2 data-section-id=\"2a1ahn\" data-start=\"3182\" data-end=\"3198\"><span class=\"ez-toc-section\" id=\"Analogy-2\"><\/span>Analogie<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-section-id=\"15gb86j\" data-start=\"55\" data-end=\"77\"><span class=\"ez-toc-section\" id=\"Peptides_are_like\"><\/span>Les peptides, c'est un peu comme :<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"78\" data-end=\"124\"><strong data-start=\"78\" data-end=\"124\">sonner \u00e0 la porte depuis l'ext\u00e9rieur de la maison.<\/strong><\/p>\n<p data-start=\"126\" data-end=\"317\">Le peptide lui-m\u00eame reste g\u00e9n\u00e9ralement \u00e0 l'ext\u00e9rieur de la cellule.<br data-start=\"176\" data-end=\"179\" \/>Elle se lie \u00e0 un r\u00e9cepteur situ\u00e9 sur la membrane cellulaire \u2014 un peu comme si l'on appuyait sur une sonnette intelligente reli\u00e9e \u00e0 un syst\u00e8me de communication interne.<\/p>\n<p data-start=\"319\" data-end=\"350\">Une fois que l'on a appuy\u00e9 sur le \u201c bouton de la sonnette \u201d :<\/p>\n<ul data-start=\"351\" data-end=\"519\">\n<li data-section-id=\"5cva3n\" data-start=\"351\" data-end=\"393\">les signaux sont transmis \u00e0 l'int\u00e9rieur de la cellule,<\/li>\n<li data-section-id=\"dfy0me\" data-start=\"394\" data-end=\"424\">les prot\u00e9ines messag\u00e8res s'activent,<\/li>\n<li data-section-id=\"khrb0\" data-start=\"425\" data-end=\"452\">les cascades de signalisation se d\u00e9clenchent,<\/li>\n<li data-section-id=\"kc51gh\" data-start=\"453\" data-end=\"519\">et la cellule adapte son comportement en fonction du message re\u00e7u.<\/li>\n<\/ul>\n<p data-start=\"521\" data-end=\"563\">En biologie mol\u00e9culaire, cela implique souvent :<\/p>\n<ul data-start=\"564\" data-end=\"675\">\n<li data-section-id=\"76u41o\" data-start=\"564\" data-end=\"581\">la signalisation des GPCR,<\/li>\n<li data-section-id=\"evlsk9\" data-start=\"582\" data-end=\"602\">AMP cyclique (AMPc),<\/li>\n<li data-section-id=\"1fqhy7f\" data-start=\"603\" data-end=\"623\">activation de la kinase,<\/li>\n<li data-section-id=\"1i1hhd2\" data-start=\"624\" data-end=\"644\">signalisation du calcium,<\/li>\n<li data-section-id=\"g3tsz\" data-start=\"645\" data-end=\"675\">ou les voies de phosphorylation.<\/li>\n<\/ul>\n<p data-start=\"677\" data-end=\"763\">En g\u00e9n\u00e9ral, le peptide ne p\u00e9n\u00e8tre pas directement dans le noyau.<br data-start=\"733\" data-end=\"736\" \/>Au lieu de cela, il indique \u00e0 la cellule :<\/p>\n<blockquote data-start=\"764\" data-end=\"813\">\n<p data-start=\"766\" data-end=\"813\">\u201c Un message vient d'arriver \u2014 adaptez votre activit\u00e9. \u201d<\/p>\n<\/blockquote>\n<p data-start=\"815\" data-end=\"854\">C'est pourquoi la signalisation peptidique est souvent :<\/p>\n<ul data-start=\"855\" data-end=\"911\">\n<li data-section-id=\"1mirlwq\" data-start=\"855\" data-end=\"863\">rapide,<\/li>\n<li data-section-id=\"1iwzfzl\" data-start=\"864\" data-end=\"875\">flexible,<\/li>\n<li data-section-id=\"1a5ehu3\" data-start=\"876\" data-end=\"888\">pulsatile,<\/li>\n<li data-section-id=\"4a5kti\" data-start=\"889\" data-end=\"911\">et tr\u00e8s cibl\u00e9es.<\/li>\n<\/ul>\n<hr data-start=\"913\" data-end=\"916\" \/>\n<h3 data-section-id=\"kuwf05\" data-start=\"918\" data-end=\"945\"><span class=\"ez-toc-section\" id=\"Steroids_are_more_like\"><\/span>Les st\u00e9ro\u00efdes, c'est plut\u00f4t :<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"946\" data-end=\"991\"><strong data-start=\"946\" data-end=\"991\">en entrant directement dans la salle de contr\u00f4le.<\/strong><\/p>\n<p data-start=\"993\" data-end=\"1113\">Les mol\u00e9cules st\u00e9ro\u00efdiennes sont liposolubles, ce qui signifie qu'elles peuvent traverser la membrane cellulaire elle-m\u00eame au lieu de rester \u00e0 l'ext\u00e9rieur.<\/p>\n<p data-start=\"1115\" data-end=\"1173\">Au lieu d\u201c\u201d actionner la sonnette \u00bb d'un r\u00e9cepteur, les st\u00e9ro\u00efdes ont souvent pour effet :<\/p>\n<ul data-start=\"1174\" data-end=\"1296\">\n<li data-section-id=\"d6cx3w\" data-start=\"1174\" data-end=\"1195\">traverser la membrane,<\/li>\n<li data-section-id=\"1gxz9xf\" data-start=\"1196\" data-end=\"1222\">p\u00e9n\u00e9trer \u00e0 l'int\u00e9rieur de la cellule,<\/li>\n<li data-section-id=\"240ueq\" data-start=\"1223\" data-end=\"1254\">se lient aux r\u00e9cepteurs intracellulaires,<\/li>\n<li data-section-id=\"5fxsvs\" data-start=\"1255\" data-end=\"1296\">et se dirigent directement vers le noyau.<\/li>\n<\/ul>\n<p data-start=\"1298\" data-end=\"1349\">Une fois dans la \u201c salle de contr\u00f4le \u201d, ils peuvent influencer :<\/p>\n<ul data-start=\"1350\" data-end=\"1455\">\n<li data-section-id=\"1n3tmeb\" data-start=\"1350\" data-end=\"1371\">transcription g\u00e9n\u00e9tique,<\/li>\n<li data-section-id=\"v8uzb0\" data-start=\"1372\" data-end=\"1393\">la production de prot\u00e9ines,<\/li>\n<li data-section-id=\"dvxt6g\" data-start=\"1394\" data-end=\"1427\">programmation cellulaire \u00e0 long terme,<\/li>\n<li data-section-id=\"r1wgf\" data-start=\"1428\" data-end=\"1455\">et la r\u00e9gulation m\u00e9tabolique.<\/li>\n<\/ul>\n<p data-start=\"1457\" data-end=\"1475\">\u00c7a ressemble plut\u00f4t \u00e0 :<\/p>\n<blockquote data-start=\"1476\" data-end=\"1561\">\n<p data-start=\"1478\" data-end=\"1561\">ouvrir le panneau de commande principal du b\u00e2timent et r\u00e9\u00e9crire les consignes d'utilisation.<\/p>\n<\/blockquote>\n<p data-start=\"1563\" data-end=\"1643\">Comme les st\u00e9ro\u00efdes agissent sur les m\u00e9canismes de transcription, leurs effets se traduisent souvent par :<\/p>\n<ul data-start=\"1644\" data-end=\"1707\">\n<li data-section-id=\"kv26h4\" data-start=\"1644\" data-end=\"1662\">plus lent au d\u00e9but,<\/li>\n<li data-section-id=\"1dwidbp\" data-start=\"1663\" data-end=\"1685\">d'un point de vue biologique plus approfondi,<\/li>\n<li data-section-id=\"162pjui\" data-start=\"1686\" data-end=\"1707\">et plus durables.<\/li>\n<\/ul>\n<hr data-start=\"3334\" data-end=\"3337\" \/>\n<h2 data-section-id=\"1s3ncl0\" data-start=\"3339\" data-end=\"3379\"><span class=\"ez-toc-section\" id=\"Why_Steroids_Often_Have_Longer_Effects\"><\/span>Pourquoi les st\u00e9ro\u00efdes ont-ils souvent des effets plus durables ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"3381\" data-end=\"3411\">Les st\u00e9ro\u00efdes ont souvent une influence sur :<\/p>\n<ul data-start=\"3412\" data-end=\"3483\">\n<li data-section-id=\"rmc6un\" data-start=\"3412\" data-end=\"3432\">transcription g\u00e9n\u00e9tique<\/li>\n<li data-section-id=\"1cr6wfo\" data-start=\"3433\" data-end=\"3452\">signalisation nucl\u00e9aire<\/li>\n<li data-section-id=\"1lh0wpf\" data-start=\"3453\" data-end=\"3483\">r\u00e9gulation de la synth\u00e8se des prot\u00e9ines<\/li>\n<\/ul>\n<p data-start=\"3485\" data-end=\"3502\">Cela peut donner :<\/p>\n<ul data-start=\"3503\" data-end=\"3556\">\n<li data-section-id=\"1luzzko\" data-start=\"3503\" data-end=\"3511\">plus lent<\/li>\n<li data-section-id=\"1avqqzv\" data-start=\"3512\" data-end=\"3520\">plus profond\u00e9ment<\/li>\n<li data-section-id=\"10tpn52\" data-start=\"3521\" data-end=\"3556\">des effets de signalisation plus durables.<\/li>\n<\/ul>\n<hr data-start=\"3558\" data-end=\"3561\" \/>\n<h2 data-section-id=\"5kr9h9\" data-start=\"3563\" data-end=\"3594\"><span class=\"ez-toc-section\" id=\"Why_Peptides_Often_Act_Faster\"><\/span>Pourquoi les peptides agissent-ils souvent plus rapidement ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"3596\" data-end=\"3622\">Les peptides provoquent g\u00e9n\u00e9ralement :<\/p>\n<ul data-start=\"3623\" data-end=\"3701\">\n<li data-section-id=\"10u7y6x\" data-start=\"3623\" data-end=\"3649\">cascades de signalisation rapides<\/li>\n<li data-section-id=\"tjfv9w\" data-start=\"3650\" data-end=\"3671\">activation des r\u00e9cepteurs<\/li>\n<li data-section-id=\"tckb7b\" data-start=\"3672\" data-end=\"3701\">syst\u00e8mes de messagers secondaires<\/li>\n<\/ul>\n<p data-start=\"3703\" data-end=\"3724\">Leurs effets peuvent \u00eatre les suivants :<\/p>\n<ul data-start=\"3725\" data-end=\"3761\">\n<li data-section-id=\"1erqgn3\" data-start=\"3725\" data-end=\"3733\">plus rapidement<\/li>\n<li data-section-id=\"1o6abcd\" data-start=\"3734\" data-end=\"3743\">plus court<\/li>\n<li data-section-id=\"bggitg\" data-start=\"3744\" data-end=\"3761\">plus saccad\u00e9<\/li>\n<\/ul>\n<hr data-start=\"3763\" data-end=\"3766\" \/>\n<h2 data-section-id=\"1njqh02\" data-start=\"3768\" data-end=\"3805\"><span class=\"ez-toc-section\" id=\"Peptides_vs_Steroids_Manufacturing\"><\/span>Peptides et st\u00e9ro\u00efdes : fabrication<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-section-id=\"13kkoos\" data-start=\"3807\" data-end=\"3831\"><span class=\"ez-toc-section\" id=\"Peptide_Manufacturing\"><\/span>Fabrication de peptides<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"3833\" data-end=\"3869\">La plupart des peptides sont synth\u00e9tis\u00e9s \u00e0 l'aide de :<\/p>\n<h3 data-section-id=\"11585ee\" data-start=\"3870\" data-end=\"3909\"><span class=\"ez-toc-section\" id=\"Solid-Phase_Peptide_Synthesis_SPPS\"><\/span>Synth\u00e8se de peptides en phase solide (SPPS)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"3911\" data-end=\"3948\"><span class=\"inline-block align-middle\"><span class=\"katex\"><span class=\"katex-mathml\">Acide amin\u00e9 1 \u2192 Acide amin\u00e9 2 \u2192 Acide amin\u00e9 3 Acide\\ amin\u00e9_1 \\rightarrow Acide\\ amin\u00e9_2 \\rightarrow Acide\\ amin\u00e9_3<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">A<\/span><span class=\"mord mathnormal\">min<\/span><span class=\"mord mathnormal\">o<\/span><span class=\"mspace\">\u00a0<\/span><span class=\"mord mathnormal\">A<\/span><span class=\"mord mathnormal\">c<\/span><span class=\"mord mathnormal\">i<\/span><span class=\"mord\"><span class=\"mord mathnormal\">d<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mrel\">\u2192<\/span><\/span><span class=\"base\"><span class=\"mord mathnormal\">A<\/span><span class=\"mord mathnormal\">min<\/span><span class=\"mord mathnormal\">o<\/span><span class=\"mspace\">\u00a0<\/span><span class=\"mord mathnormal\">A<\/span><span class=\"mord mathnormal\">c<\/span><span class=\"mord mathnormal\">i<\/span><span class=\"mord\"><span class=\"mord mathnormal\">d<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mrel\">\u2192<\/span><\/span><span class=\"base\"><span class=\"mord mathnormal\">A<\/span><span class=\"mord mathnormal\">min<\/span><span class=\"mord mathnormal\">o<\/span><span class=\"mspace\">\u00a0<\/span><span class=\"mord mathnormal\">A<\/span><span class=\"mord mathnormal\">c<\/span><span class=\"mord mathnormal\">i<\/span><span class=\"mord\"><span class=\"mord mathnormal\">d<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">3<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p data-start=\"3950\" data-end=\"3973\">Ce processus rassemble :<\/p>\n<ul data-start=\"3974\" data-end=\"4007\">\n<li data-section-id=\"1y6zwua\" data-start=\"3974\" data-end=\"4007\">cha\u00eenes d'acides amin\u00e9s<br \/>\n\u00e9tape par \u00e9tape.<\/li>\n<\/ul>\n<hr data-start=\"4009\" data-end=\"4012\" \/>\n<h3 data-section-id=\"1jihpdj\" data-start=\"4014\" data-end=\"4038\"><span class=\"ez-toc-section\" id=\"Steroid_Manufacturing\"><\/span>Fabrication de st\u00e9ro\u00efdes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"4040\" data-end=\"4076\">La production de st\u00e9ro\u00efdes implique g\u00e9n\u00e9ralement :<\/p>\n<ul data-start=\"4077\" data-end=\"4177\">\n<li data-section-id=\"1s1l7rx\" data-start=\"4077\" data-end=\"4095\">chimie des st\u00e9rols<\/li>\n<li data-section-id=\"1q4ij5i\" data-start=\"4096\" data-end=\"4110\">fermentation<\/li>\n<li data-section-id=\"oj54gl\" data-start=\"4111\" data-end=\"4141\">synth\u00e8se organique en plusieurs \u00e9tapes<\/li>\n<li data-section-id=\"1gjkpx0\" data-start=\"4142\" data-end=\"4177\">interm\u00e9diaires d\u00e9riv\u00e9s du cholest\u00e9rol<\/li>\n<\/ul>\n<hr data-start=\"4179\" data-end=\"4182\" \/>\n<h2 data-section-id=\"152n9ff\" data-start=\"4184\" data-end=\"4215\"><span class=\"ez-toc-section\" id=\"Why_Peptides_Are_More_Fragile\"><\/span>Pourquoi les peptides sont-ils plus fragiles ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"4217\" data-end=\"4254\">Les peptides sont chimiquement sensibles \u00e0 :<\/p>\n<ul data-start=\"4255\" data-end=\"4310\">\n<li data-section-id=\"1j34afk\" data-start=\"4255\" data-end=\"4261\">chaleur<\/li>\n<li data-section-id=\"1eb46ak\" data-start=\"4262\" data-end=\"4274\">hydrolyse<\/li>\n<li data-section-id=\"1pn5kz3\" data-start=\"4275\" data-end=\"4286\">oxydation<\/li>\n<li data-section-id=\"1pc0d1a\" data-start=\"4287\" data-end=\"4310\">d\u00e9gradation enzymatique<\/li>\n<\/ul>\n<p data-start=\"4312\" data-end=\"4342\">C'est pourquoi de nombreux peptides sont :<\/p>\n<ul data-start=\"4343\" data-end=\"4394\">\n<li data-section-id=\"1tgbg9p\" data-start=\"4343\" data-end=\"4356\">lyophilis\u00e9<\/li>\n<li data-section-id=\"1mwle92\" data-start=\"4357\" data-end=\"4371\">r\u00e9frig\u00e9r\u00e9<\/li>\n<li data-section-id=\"i8ajj8\" data-start=\"4372\" data-end=\"4394\">soigneusement stabilis\u00e9<\/li>\n<\/ul>\n<hr data-start=\"4396\" data-end=\"4399\" \/>\n<h2 data-section-id=\"15w74ft\" data-start=\"4401\" data-end=\"4437\"><span class=\"ez-toc-section\" id=\"Why_Steroids_Are_Often_More_Stable\"><\/span>Pourquoi les st\u00e9ro\u00efdes sont souvent plus stables<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"4439\" data-end=\"4452\">Les st\u00e9ro\u00efdes sont :<\/p>\n<ul data-start=\"4453\" data-end=\"4487\">\n<li data-section-id=\"10jgib0\" data-start=\"4453\" data-end=\"4466\">\u00e0 base de lipides<\/li>\n<li data-section-id=\"yq1u0h\" data-start=\"4467\" data-end=\"4487\">structurellement rigide<\/li>\n<\/ul>\n<p data-start=\"4489\" data-end=\"4512\">ce qui les am\u00e8ne souvent \u00e0 :<\/p>\n<ul data-start=\"4513\" data-end=\"4553\">\n<li data-section-id=\"evdq1k\" data-start=\"4513\" data-end=\"4553\">plus r\u00e9sistant aux produits chimiques<br \/>\nque les peptides.<\/li>\n<\/ul>\n<hr data-start=\"4555\" data-end=\"4558\" \/>\n<h2 data-section-id=\"1yqltku\" data-start=\"4560\" data-end=\"4604\"><span class=\"ez-toc-section\" id=\"Peptides_vs_Steroids_in_Biological_Systems\"><\/span>Les peptides face aux st\u00e9ro\u00efdes dans les syst\u00e8mes biologiques<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-section-id=\"fgn5qn\" data-start=\"4606\" data-end=\"4617\"><span class=\"ez-toc-section\" id=\"Peptides-3\"><\/span>Peptides<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"4619\" data-end=\"4638\">En g\u00e9n\u00e9ral, on coordonne :<\/p>\n<ul data-start=\"4639\" data-end=\"4708\">\n<li data-section-id=\"1eg733q\" data-start=\"4639\" data-end=\"4664\">communication par signaux<\/li>\n<li data-section-id=\"tjfv9w\" data-start=\"4665\" data-end=\"4686\">activation des r\u00e9cepteurs<\/li>\n<li data-section-id=\"kai0kk\" data-start=\"4687\" data-end=\"4708\">communication mol\u00e9culaire<\/li>\n<\/ul>\n<hr data-start=\"4710\" data-end=\"4713\" \/>\n<h3 data-section-id=\"1w0gvac\" data-start=\"4715\" data-end=\"4726\"><span class=\"ez-toc-section\" id=\"Steroids-3\"><\/span>St\u00e9ro\u00efdes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"4728\" data-end=\"4747\">En g\u00e9n\u00e9ral, on coordonne :<\/p>\n<ul data-start=\"4748\" data-end=\"4829\">\n<li data-section-id=\"1j39qfb\" data-start=\"4748\" data-end=\"4780\">signalisation r\u00e9gulatrice \u00e0 long terme<\/li>\n<li data-section-id=\"149stxo\" data-start=\"4781\" data-end=\"4806\">r\u00e9gulation transcriptionnelle<\/li>\n<li data-section-id=\"1pui6sv\" data-start=\"4807\" data-end=\"4829\">r\u00e9gulation endocrinienne<\/li>\n<\/ul>\n<hr data-start=\"4831\" data-end=\"4834\" \/>\n<h2 data-section-id=\"3oaw1s\" data-start=\"4836\" data-end=\"4872\"><span class=\"ez-toc-section\" id=\"What_Most_Articles_Fail_to_Explain\"><\/span>Ce que la plupart des articles omettent d'expliquer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"4874\" data-end=\"4928\">De nombreux sites web comparent les peptides et les st\u00e9ro\u00efdes uniquement sur la base de :<\/p>\n<ul data-start=\"4929\" data-end=\"4973\">\n<li data-section-id=\"10dtct\" data-start=\"4929\" data-end=\"4946\">performance<br \/>\nou :<\/li>\n<li data-section-id=\"1a6wvmv\" data-start=\"4947\" data-end=\"4973\">perspectives esth\u00e9tiques.<\/li>\n<\/ul>\n<p data-start=\"4975\" data-end=\"5023\">Mais d'un point de vue scientifique,<br \/>\nLa diff\u00e9rence essentielle est la suivante :<\/p>\n<h3 data-section-id=\"6dke8u\" data-start=\"5024\" data-end=\"5054\"><span class=\"ez-toc-section\" id=\"communication_architecture\"><\/span>architecture de communication.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<hr data-start=\"5056\" data-end=\"5059\" \/>\n<h2 data-section-id=\"wix1h8\" data-start=\"5061\" data-end=\"5095\"><span class=\"ez-toc-section\" id=\"Peptides_Communication_Signals\"><\/span>Les peptides = signaux de communication<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"5097\" data-end=\"5116\">Les peptides sont souvent :<\/p>\n<ul data-start=\"5117\" data-end=\"5140\">\n<li data-section-id=\"1wqjmth\" data-start=\"5117\" data-end=\"5140\">supports d'information.<\/li>\n<\/ul>\n<p data-start=\"5142\" data-end=\"5158\">Ils aident les cellules \u00e0 :<\/p>\n<ul data-start=\"5159\" data-end=\"5243\">\n<li data-section-id=\"1jwsdx6\" data-start=\"5159\" data-end=\"5181\">coordonner les interventions<\/li>\n<li data-section-id=\"1691v96\" data-start=\"5182\" data-end=\"5215\">\u00e9changer des instructions mol\u00e9culaires<\/li>\n<li data-section-id=\"6wjs4f\" data-start=\"5216\" data-end=\"5243\">r\u00e9guler la synchronisation de la signalisation<\/li>\n<\/ul>\n<hr data-start=\"5245\" data-end=\"5248\" \/>\n<h2 data-section-id=\"j88y5p\" data-start=\"5250\" data-end=\"5285\"><span class=\"ez-toc-section\" id=\"Steroids_Regulatory_Controllers\"><\/span>St\u00e9ro\u00efdes = r\u00e9gulateurs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"5287\" data-end=\"5321\">Les st\u00e9ro\u00efdes agissent souvent plut\u00f4t comme :<\/p>\n<ul data-start=\"5322\" data-end=\"5384\">\n<li data-section-id=\"5b2bu\" data-start=\"5322\" data-end=\"5357\">r\u00e9gulateurs principaux<br \/>\nqui influencent :<\/li>\n<li data-section-id=\"c7kfx3\" data-start=\"5358\" data-end=\"5384\">des programmes g\u00e9n\u00e9tiques dans leur int\u00e9gralit\u00e9.<\/li>\n<\/ul>\n<hr data-start=\"5386\" data-end=\"5389\" \/>\n<h2 data-section-id=\"2a1ahn\" data-start=\"5391\" data-end=\"5407\"><span class=\"ez-toc-section\" id=\"Simple_Analogy\"><\/span>Analogie simple<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"5409\" data-end=\"5427\">Les peptides, c'est un peu comme :<\/p>\n<ul data-start=\"5428\" data-end=\"5472\">\n<li data-section-id=\"1dzq5pe\" data-start=\"5428\" data-end=\"5472\">l'\u00e9change de SMS entre les services.<\/li>\n<\/ul>\n<p data-start=\"5474\" data-end=\"5497\">Les st\u00e9ro\u00efdes, c'est plut\u00f4t :<\/p>\n<ul data-start=\"5498\" data-end=\"5533\">\n<li data-section-id=\"19ye4w7\" data-start=\"5498\" data-end=\"5533\">r\u00e9\u00e9criture des manuels de politique d'entreprise.<\/li>\n<\/ul>\n<hr data-start=\"5535\" data-end=\"5538\" \/>\n<h2 data-section-id=\"eumxpf\" data-start=\"5540\" data-end=\"5568\"><span class=\"ez-toc-section\" id=\"Why_Researchers_Study_Both\"><\/span>Pourquoi les chercheurs \u00e9tudient-ils les deux ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"5570\" data-end=\"5596\">Les laboratoires modernes \u00e9tudient :<\/p>\n<h3 data-section-id=\"52qzlb\" data-start=\"5597\" data-end=\"5608\"><span class=\"ez-toc-section\" id=\"peptides\"><\/span>peptides<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"5609\" data-end=\"5613\">pour :<\/p>\n<ul data-start=\"5614\" data-end=\"5689\">\n<li data-section-id=\"11pv6p0\" data-start=\"5614\" data-end=\"5636\">sp\u00e9cificit\u00e9 des r\u00e9cepteurs<\/li>\n<li data-section-id=\"1kkp0n4\" data-start=\"5637\" data-end=\"5658\">pr\u00e9cision de signalisation<\/li>\n<li data-section-id=\"1kpocbn\" data-start=\"5659\" data-end=\"5689\">ing\u00e9nierie cibl\u00e9e des voies m\u00e9taboliques<\/li>\n<\/ul>\n<p data-start=\"5691\" data-end=\"5701\">et \u00e9tudier :<\/p>\n<h3 data-section-id=\"1qnbt50\" data-start=\"5702\" data-end=\"5713\"><span class=\"ez-toc-section\" id=\"steroids\"><\/span>st\u00e9ro\u00efdes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"5714\" data-end=\"5718\">pour :<\/p>\n<ul data-start=\"5719\" data-end=\"5787\">\n<li data-section-id=\"1pui6sv\" data-start=\"5719\" data-end=\"5741\">r\u00e9gulation endocrinienne<\/li>\n<li data-section-id=\"1cr6wfo\" data-start=\"5742\" data-end=\"5761\">signalisation nucl\u00e9aire<\/li>\n<li data-section-id=\"fcc8gi\" data-start=\"5762\" data-end=\"5787\">biologie transcriptionnelle<\/li>\n<\/ul>\n<hr data-start=\"5789\" data-end=\"5792\" \/>\n<h2 data-section-id=\"x10r7g\" data-start=\"5794\" data-end=\"5822\"><span class=\"ez-toc-section\" id=\"Are_Any_Hormones_Peptides\"><\/span>Certaines hormones sont-elles des peptides ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"5824\" data-end=\"5828\">Oui.<\/p>\n<p data-start=\"5830\" data-end=\"5865\">Certaines hormones sont des hormones peptidiques.<\/p>\n<p data-start=\"5867\" data-end=\"5884\">En voici quelques exemples :<\/p>\n<ul data-start=\"5885\" data-end=\"5922\">\n<li data-section-id=\"24zkw2\" data-start=\"5885\" data-end=\"5894\">insuline<\/li>\n<li data-section-id=\"1lklg1e\" data-start=\"5895\" data-end=\"5905\">glucagon<\/li>\n<li data-section-id=\"1shz8bp\" data-start=\"5906\" data-end=\"5922\">hormone de croissance<\/li>\n<\/ul>\n<p data-start=\"5924\" data-end=\"5946\">Mais de nombreuses hormones sont :<\/p>\n<ul data-start=\"5947\" data-end=\"5972\">\n<li data-section-id=\"1mdp95q\" data-start=\"5947\" data-end=\"5972\">st\u00e9ro\u00efdes,<br \/>\npas des peptides.<\/li>\n<\/ul>\n<hr data-start=\"5974\" data-end=\"5977\" \/>\n<h1 data-section-id=\"1asrp8k\" data-start=\"5979\" data-end=\"6004\"><span class=\"ez-toc-section\" id=\"Important_Clarification\"><\/span>Pr\u00e9cision importante<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<h3 data-section-id=\"zjven5\" data-start=\"6006\" data-end=\"6042\"><span class=\"ez-toc-section\" id=\"Hormones_are_a_function_category\"><\/span>Les hormones constituent une cat\u00e9gorie fonctionnelle.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h3 data-section-id=\"15c3jxp\" data-start=\"6044\" data-end=\"6094\"><span class=\"ez-toc-section\" id=\"Peptides_and_steroids_are_chemistry_categories\"><\/span>Les peptides et les st\u00e9ro\u00efdes sont des cat\u00e9gories de compos\u00e9s chimiques.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"6096\" data-end=\"6136\">C'est l\u00e0 que beaucoup de lecteurs ont du mal \u00e0 comprendre.<\/p>\n<hr data-start=\"6138\" data-end=\"6141\" \/>\n<h2 data-section-id=\"36yu0t\" data-start=\"6143\" data-end=\"6153\"><span class=\"ez-toc-section\" id=\"Examples\"><\/span>Exemples<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"TyagGW_tableContainer\">\n<div class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"6155\" data-end=\"6318\">\n<thead data-start=\"6155\" data-end=\"6178\">\n<tr data-start=\"6155\" data-end=\"6178\">\n<th class=\"last:pe-10\" data-start=\"6155\" data-end=\"6166\" data-col-size=\"sm\">Mol\u00e9cule<\/th>\n<th class=\"last:pe-10\" data-start=\"6166\" data-end=\"6178\" data-col-size=\"sm\">Cat\u00e9gorie<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"6189\" data-end=\"6318\">\n<tr data-start=\"6189\" data-end=\"6218\">\n<td data-start=\"6189\" data-end=\"6199\" data-col-size=\"sm\">Insuline<\/td>\n<td data-start=\"6199\" data-end=\"6218\" data-col-size=\"sm\">hormone peptidique<\/td>\n<\/tr>\n<tr data-start=\"6219\" data-end=\"6252\">\n<td data-start=\"6219\" data-end=\"6225\" data-col-size=\"sm\">HGH<\/td>\n<td data-start=\"6225\" data-end=\"6252\" data-col-size=\"sm\">hormone prot\u00e9ique\/peptidique<\/td>\n<\/tr>\n<tr data-start=\"6253\" data-end=\"6287\">\n<td data-start=\"6253\" data-end=\"6268\" data-col-size=\"sm\">Testost\u00e9rone<\/td>\n<td data-start=\"6268\" data-end=\"6287\" data-col-size=\"sm\">hormone st\u00e9ro\u00efde<\/td>\n<\/tr>\n<tr data-start=\"6288\" data-end=\"6318\">\n<td data-start=\"6288\" data-end=\"6299\" data-col-size=\"sm\">Cortisol<\/td>\n<td data-start=\"6299\" data-end=\"6318\" data-col-size=\"sm\">hormone st\u00e9ro\u00efde<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<hr data-start=\"6320\" data-end=\"6323\" \/>\n<h2 data-section-id=\"2td5c\" data-start=\"6325\" data-end=\"6355\"><span class=\"ez-toc-section\" id=\"Why_This_Matters_in_Research\"><\/span>Pourquoi cela est-il important dans le domaine de la recherche ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"6357\" data-end=\"6386\">Le type de mol\u00e9cule d\u00e9termine :<\/p>\n<ul data-start=\"6387\" data-end=\"6495\">\n<li data-section-id=\"1y4cp0a\" data-start=\"6387\" data-end=\"6409\">interaction avec les r\u00e9cepteurs<\/li>\n<li data-section-id=\"1hd8qjr\" data-start=\"6410\" data-end=\"6430\">comportement en mati\u00e8re de transport<\/li>\n<li data-section-id=\"m4uw2o\" data-start=\"6431\" data-end=\"6442\">demi-vie<\/li>\n<li data-section-id=\"sdjeja\" data-start=\"6443\" data-end=\"6464\">m\u00e9thodes de formulation<\/li>\n<li data-section-id=\"9aw8el\" data-start=\"6465\" data-end=\"6476\">stabilit\u00e9<\/li>\n<li data-section-id=\"18cymaq\" data-start=\"6477\" data-end=\"6495\">syst\u00e8mes de distribution<\/li>\n<\/ul>\n<hr data-start=\"6497\" data-end=\"6500\" \/>\n<h2 data-section-id=\"hp8u91\" data-start=\"6502\" data-end=\"6532\"><span class=\"ez-toc-section\" id=\"Scientific_Perspective\"><\/span>Point de vue scientifique<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"6534\" data-end=\"6992\">Les peptides et les st\u00e9ro\u00efdes constituent des syst\u00e8mes mol\u00e9culaires fondamentalement diff\u00e9rents. Les peptides sont des mol\u00e9cules de signalisation \u00e0 base d'acides amin\u00e9s qui agissent g\u00e9n\u00e9ralement par l'interm\u00e9diaire de r\u00e9cepteurs situ\u00e9s \u00e0 la surface cellulaire, tandis que les st\u00e9ro\u00efdes sont des mol\u00e9cules lipidiques d\u00e9riv\u00e9es du cholest\u00e9rol qui p\u00e9n\u00e8trent souvent directement dans les cellules et r\u00e9gulent les voies de signalisation intracellulaires. Bien que les deux interviennent dans la biologie endocrinienne et la biologie de la signalisation, leur composition chimique, leur architecture mol\u00e9culaire et leurs m\u00e9canismes d'action sont totalement diff\u00e9rents.<\/p>\n<hr data-start=\"6994\" data-end=\"6997\" \/>\n<h2 data-section-id=\"1o3e2u7\" data-start=\"6999\" data-end=\"7015\"><span class=\"ez-toc-section\" id=\"Summary\"><\/span>R\u00e9sum\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"7017\" data-end=\"7372\">Les peptides ne sont pas des st\u00e9ro\u00efdes. Les peptides sont des cha\u00eenes d'acides amin\u00e9s destin\u00e9es \u00e0 la communication par signalisation, tandis que les st\u00e9ro\u00efdes sont des mol\u00e9cules d\u00e9riv\u00e9es des lipides, construites \u00e0 partir de structures cycliques de cholest\u00e9rol. Leurs r\u00f4les biologiques peuvent se recouper dans certains syst\u00e8mes endocriniens, mais leur composition chimique, le comportement de leurs r\u00e9cepteurs, leurs m\u00e9canismes de transport et leur architecture de signalisation sont totalement diff\u00e9rents.<\/p>\n<hr data-start=\"7374\" data-end=\"7377\" \/>\n<h2 data-section-id=\"1mpc0g\" data-start=\"7379\" data-end=\"7384\"><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-section-id=\"19tfpfx\" data-start=\"7386\" data-end=\"7422\"><span class=\"ez-toc-section\" id=\"Are_peptides_considered_steroids\"><\/span>Les peptides sont-ils consid\u00e9r\u00e9s comme des st\u00e9ro\u00efdes ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"7424\" data-end=\"7485\">Non. Les peptides et les st\u00e9ro\u00efdes appartiennent \u00e0 des cat\u00e9gories mol\u00e9culaires diff\u00e9rentes.<\/p>\n<hr data-start=\"7487\" data-end=\"7490\" \/>\n<h3 data-section-id=\"sufgko\" data-start=\"7492\" data-end=\"7521\"><span class=\"ez-toc-section\" id=\"What_are_peptides_made_of\"><\/span>De quoi sont compos\u00e9s les peptides ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"7523\" data-end=\"7546\">Les peptides sont compos\u00e9s de :<\/p>\n<ul data-start=\"7547\" data-end=\"7588\">\n<li data-section-id=\"uglyyf\" data-start=\"7547\" data-end=\"7588\">des acides amin\u00e9s reli\u00e9s par des liaisons peptidiques.<\/li>\n<\/ul>\n<hr data-start=\"7590\" data-end=\"7593\" \/>\n<h3 data-section-id=\"1cpuzvn\" data-start=\"7595\" data-end=\"7624\"><span class=\"ez-toc-section\" id=\"What_are_steroids_made_of\"><\/span>De quoi sont compos\u00e9s les st\u00e9ro\u00efdes ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"7626\" data-end=\"7652\">Les st\u00e9ro\u00efdes sont d\u00e9riv\u00e9s de :<\/p>\n<ul data-start=\"7653\" data-end=\"7694\">\n<li data-section-id=\"1qzs1w2\" data-start=\"7653\" data-end=\"7694\">structures cycliques lipidiques de type cholest\u00e9rol.<\/li>\n<\/ul>\n<hr data-start=\"7696\" data-end=\"7699\" \/>\n<h3 data-section-id=\"191a8tw\" data-start=\"7701\" data-end=\"7751\"><span class=\"ez-toc-section\" id=\"Do_peptides_enter_cells_directly_like_steroids\"><\/span>Les peptides p\u00e9n\u00e8trent-ils directement dans les cellules, comme les st\u00e9ro\u00efdes ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"7753\" data-end=\"7817\">En g\u00e9n\u00e9ral, non. La plupart des peptides se lient \u00e0 des r\u00e9cepteurs situ\u00e9s \u00e0 la surface des cellules.<\/p>\n<hr data-start=\"7819\" data-end=\"7822\" \/>\n<h3 data-section-id=\"1nh9jf9\" data-start=\"7824\" data-end=\"7871\"><span class=\"ez-toc-section\" id=\"Why_are_peptides_more_fragile_than_steroids\"><\/span>Pourquoi les peptides sont-ils plus instables que les st\u00e9ro\u00efdes ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"7873\" data-end=\"7918\">\u00c9tant donn\u00e9 que les liaisons peptidiques sont plus sensibles \u00e0 :<\/p>\n<ul data-start=\"7919\" data-end=\"7962\">\n<li data-section-id=\"1j34afk\" data-start=\"7919\" data-end=\"7925\">chaleur<\/li>\n<li data-section-id=\"1eb46ak\" data-start=\"7926\" data-end=\"7938\">hydrolyse<\/li>\n<li data-section-id=\"1pc0d1a\" data-start=\"7939\" data-end=\"7962\">d\u00e9gradation enzymatique<\/li>\n<\/ul>\n<p data-start=\"7964\" data-end=\"7999\">que les structures cycliques st\u00e9ro\u00efdiennes rigides.<\/p>\n<hr data-start=\"8001\" data-end=\"8004\" \/>\n<h2 data-section-id=\"1ue9448\" data-start=\"8006\" data-end=\"8030\"><span class=\"ez-toc-section\" id=\"References\"><\/span>R\u00e9f\u00e9rences<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"8032\" data-end=\"8143\">Alberts, B., Johnson, A., Lewis, J., et al. (2022). <em data-start=\"8084\" data-end=\"8115\">Biologie mol\u00e9culaire de la cellule<\/em> (7e \u00e9d.). Garland Science.<\/p>\n<p data-start=\"8145\" data-end=\"8326\">Fosgerau, K., &amp; Hoffmann, T. (2015). Th\u00e9rapies peptidiques : \u00e9tat des lieux et perspectives d'avenir. <em data-start=\"8242\" data-end=\"8264\">La recherche pharmaceutique aujourd'hui<\/em>, 20(1), 122\u2013128. <a class=\"decorated-link\" href=\"https:\/\/doi.org\/10.1016\/j.drudis.2014.10.003\" target=\"_new\" rel=\"noopener\" data-start=\"8282\" data-end=\"8326\">https:\/\/doi.org\/10.1016\/j.drudis.2014.10.003<\/a><\/p>\n<p data-start=\"8328\" data-end=\"8517\">Miller, W. L., &amp; Auchus, R. J. (2011). Biologie mol\u00e9culaire, biochimie et physiologie de la st\u00e9ro\u00efdogen\u00e8se humaine. <em data-start=\"8445\" data-end=\"8464\">Revues d'endocrinologie<\/em>, 32(1), 81\u2013151. <a class=\"decorated-link cursor-pointer\" href=\"https:\/\/doi.org\/10.1210\/er.2010-0013\" target=\"_new\" rel=\"noopener\" data-start=\"8481\" data-end=\"8517\">https:\/\/doi.org\/10.1210\/er.2010-0013<\/a><\/p>\n<p data-start=\"8519\" data-end=\"8556\"><span class=\"\" data-state=\"closed\"><a class=\"decorated-link\" href=\"https:\/\/doi.org\/10.1016\/j.drudis.2014.10.003?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noopener\">DOI : 10.1016\/j.drudis.2014.10.003<\/a><\/span><\/p>\n<p data-start=\"8558\" data-end=\"8595\" data-is-last-node=\"\" data-is-only-node=\"\"><span class=\"\" data-state=\"closed\"><a class=\"decorated-link cursor-pointer\" href=\"http:\/\/DOI:10.1210\/er.2010-0013\" target=\"_blank\" rel=\"noopener\">DOI : 10.1210\/er.2010-0013<\/a><\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Peptides vs Steroids Explained Simply A molecular biology and biochemical signaling perspective Brielf Overview Peptides and steroids are completely different types of biological molecules. Peptides are short chains of amino acids connected by peptide bonds, while steroids are lipid-based molecules derived from cholesterol structures. Peptides mainly function through receptor signaling on cell surfaces, whereas steroids &#8230; <a title=\"Les peptides sont-ils des st\u00e9ro\u00efdes ?\" class=\"read-more\" href=\"https:\/\/senopeptide.com\/fr\/are-peptides-steroids\/\" aria-label=\"En savoir plus sur Are Peptides Steroids?\">Lire la suite<\/a><\/p>","protected":false},"author":1,"featured_media":759,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-758","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seno-peptides-research"],"_links":{"self":[{"href":"https:\/\/senopeptide.com\/fr\/wp-json\/wp\/v2\/posts\/758","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/senopeptide.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/senopeptide.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/senopeptide.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/senopeptide.com\/fr\/wp-json\/wp\/v2\/comments?post=758"}],"version-history":[{"count":2,"href":"https:\/\/senopeptide.com\/fr\/wp-json\/wp\/v2\/posts\/758\/revisions"}],"predecessor-version":[{"id":767,"href":"https:\/\/senopeptide.com\/fr\/wp-json\/wp\/v2\/posts\/758\/revisions\/767"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/senopeptide.com\/fr\/wp-json\/wp\/v2\/media\/759"}],"wp:attachment":[{"href":"https:\/\/senopeptide.com\/fr\/wp-json\/wp\/v2\/media?parent=758"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/senopeptide.com\/fr\/wp-json\/wp\/v2\/categories?post=758"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/senopeptide.com\/fr\/wp-json\/wp\/v2\/tags?post=758"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}