{"id":138,"date":"2026-05-18T17:11:25","date_gmt":"2026-05-18T17:11:25","guid":{"rendered":"https:\/\/actinpeptides.com\/?post_type=product&#038;p=138"},"modified":"2026-08-07T13:01:06","modified_gmt":"2026-08-07T13:01:06","slug":"receptor-grade-igf-1-lr3-1mg","status":"publish","type":"product","link":"https:\/\/actinpeptides.com\/fr\/product\/receptor-grade-igf-1-lr3-1mg\/","title":{"rendered":"IGF-1 LR3 de qualit\u00e9 r\u00e9cepteur (1 mg)"},"content":{"rendered":"<h1>Receptor Grade IGF-1 LR3 Peptide: Research, Mechanism, and Cellular Signaling<\/h1>\n<h2>Introduction<\/h2>\n<p><strong>Peptide IGF-1 LR3 de qualit\u00e9 r\u00e9cepteur<\/strong> is a synthetic analog of insulin-like growth factor-1 (IGF-1) that researchers have developed for laboratory studies involving cellular growth, metabolism, protein synthesis, and receptor-mediated signaling. Also known as <strong>Long R3 IGF-1<\/strong>, <strong>IGF-1 LR3<\/strong>, or <strong>Long-(Arg3) insulin-like growth factor-I<\/strong>, this modified peptide differs structurally from native IGF-1 through an extended N-terminal sequence and an arginine substitution at position 3.<\/p>\n<p>IGF-1 is a naturally occurring 70-amino-acid peptide associated with growth-factor signaling. By comparison, IGF-1 LR3 contains 83 amino acids. Researchers have investigated this structural modification because it may alter the peptide&#8217;s interaction with IGF-binding proteins (IGFBPs) and consequently influence its availability in experimental systems.<\/p>\n<p>At Actin Peptides, <strong>Receptor Grade IGF-1 LR3 research<\/strong> is presented strictly within a laboratory and scientific context. It is particularly relevant to research involving growth-factor signaling, cellular metabolism, receptor interactions, and anabolic signaling pathways.<\/p>\n<hr \/>\n<h2>What Is Receptor Grade IGF-1 LR3?<\/h2>\n<p><strong>Receptor Grade IGF-1 LR3 is a modified 83-amino-acid analog of IGF-1 designed for receptor-focused laboratory research.<\/strong> Its structural differences from native IGF-1 may reduce its interaction with certain IGF-binding proteins, making it useful for investigating IGF-related signaling in experimental models.<\/p>\n<p>The peptide emerged from research into somatomedins and insulin-like growth factors. Scientists originally identified serum factors associated with growth hormone activity and later characterized them as insulin-like growth factors.<\/p>\n<p>Researchers subsequently developed modified IGF-1 analogs to investigate how structural changes affect receptor interactions, bioavailability, and biological signaling.<\/p>\n<hr \/>\n<h2>Receptor Grade IGF-1 LR3 Overview<\/h2>\n<p>Native IGF-1 contains 70 amino acids. IGF-1 LR3 contains an additional N-terminal sequence and an arginine substitution at residue 3, resulting in an 83-amino-acid structure.<\/p>\n<p>These modifications are important because IGF-binding proteins can regulate the availability and distribution of IGF molecules.<\/p>\n<p>Research suggests that IGF-1 LR3 may interact differently with IGFBPs than native IGF-1. Consequently, scientists have investigated whether these structural characteristics alter tissue distribution and receptor-mediated signaling in experimental models.<\/p>\n<h3>Key characteristics<\/h3>\n<ul>\n<li><strong>Peptide class:<\/strong> Modified insulin-like growth factor analog<\/li>\n<li><strong>Native counterpart:<\/strong> IGF-1<\/li>\n<li><strong>Length:<\/strong> 83 amino acids<\/li>\n<li><strong>Native IGF-1 length:<\/strong> 70 amino acids<\/li>\n<li><strong>Structural modification:<\/strong> Extended N-terminal region and Arg3 substitution<\/li>\n<li><strong>Primary research areas:<\/strong> Growth-factor signaling, cellular metabolism, receptor biology, and anabolic signaling<\/li>\n<li><strong>Research status:<\/strong> Preclinical and laboratory research<\/li>\n<\/ul>\n<hr \/>\n<h2>Receptor Grade IGF-1 LR3 Mechanism of Action<\/h2>\n<h2>IGF-1 Receptor Signaling<\/h2>\n<p>Le <strong>IGF-1 LR3 mechanism<\/strong> centers on research into insulin-like growth factor signaling. IGF-1 normally interacts with the insulin-like growth factor-1 receptor (IGF-1R), a receptor tyrosine kinase located on the surface of many cell types.<\/p>\n<p>Activation of IGF-1R can initiate intracellular signaling cascades associated with:<\/p>\n<ul>\n<li>Croissance cellulaire<\/li>\n<li>Survie cellulaire<\/li>\n<li>Protein synthesis<\/li>\n<li>Utilisation du glucose<\/li>\n<li>Diff\u00e9renciation cellulaire<\/li>\n<li>R\u00e9gulation m\u00e9tabolique<\/li>\n<\/ul>\n<p>Researchers have investigated whether IGF-1 LR3 can engage similar signaling systems while exhibiting altered interactions with IGF-binding proteins.<\/p>\n<hr \/>\n<h2>IGF-Binding Proteins and Bioavailability<\/h2>\n<p>IGF-binding proteins (IGFBPs) regulate the availability and distribution of IGF molecules within biological systems.<\/p>\n<p>Research suggests that the structural modifications incorporated into IGF-1 LR3 reduce its binding to some IGFBPs. This characteristic has attracted scientific interest because altered IGFBP interaction may change the peptide&#8217;s distribution and receptor availability in experimental systems.<\/p>\n<p>Animal research has examined the distribution of IGF-1 LR3 following exposure and detected the peptide in organs including the kidneys, ovaries, and adrenal glands.<\/p>\n<p>However, tissue distribution observed in animal models does not establish equivalent behavior in humans.<\/p>\n<hr \/>\n<h2>PI3K-Akt Signaling<\/h2>\n<p>One major signaling pathway associated with IGF research is the <strong>phosphoinositide 3-kinase (PI3K)-Akt pathway<\/strong>.<\/p>\n<p>When growth-factor receptors activate PI3K, downstream Akt signaling can influence several cellular processes, including:<\/p>\n<ul>\n<li>Survie cellulaire<\/li>\n<li>Protein synthesis<\/li>\n<li>Transport du glucose<\/li>\n<li>M\u00e9tabolisme cellulaire<\/li>\n<li>Growth-related signaling<\/li>\n<\/ul>\n<p>Researchers have therefore investigated IGF-1 analogs in experimental models to understand how modified IGF signaling may influence these intracellular processes.<\/p>\n<hr \/>\n<h2>AMPK and Cellular Metabolism<\/h2>\n<p>Le <strong>AMP-activated protein kinase (AMPK)<\/strong> pathway acts as an important cellular energy sensor.<\/p>\n<p>Research has explored potential relationships between IGF-related signaling, PI3K-Akt activity, and AMPK-associated metabolic regulation. These pathways can influence glucose transport and energy utilization within cells.<\/p>\n<p>Because IGF signaling intersects with metabolic pathways, IGF-1 LR3 has been investigated as a research tool for studying these relationships.<\/p>\n<hr \/>\n<h2>Autocrine and Paracrine Signaling<\/h2>\n<p>Growth-factor signaling can occur through both <strong>autocrine<\/strong> et <strong>paracrine<\/strong> mechanisms.<\/p>\n<ul>\n<li><strong>Autocrine signaling:<\/strong> A cell produces a signaling molecule that acts on the same cell.<\/li>\n<li><strong>Paracrine signaling:<\/strong> A signaling molecule influences nearby cells.<\/li>\n<\/ul>\n<p>Researchers have proposed that altered IGF-1 availability could influence these signaling patterns in experimental tissue models.<\/p>\n<hr \/>\n<h2>Chemical Makeup of Receptor Grade IGF-1 LR3<\/h2>\n<table>\n<thead>\n<tr>\n<th>Property<\/th>\n<th>D\u00e9tails<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Molecular Formula<\/strong><\/td>\n<td>C400H625N111O115S9<\/td>\n<\/tr>\n<tr>\n<td><strong>Molecular Weight<\/strong><\/td>\n<td>9,117.5 g\/mol<\/td>\n<\/tr>\n<tr>\n<td><strong>Longueur du peptide<\/strong><\/td>\n<td>83 amino acids<\/td>\n<\/tr>\n<tr>\n<td><strong>Native IGF-1 Length<\/strong><\/td>\n<td>70 amino acids<\/td>\n<\/tr>\n<tr>\n<td><strong>Other Known Titles<\/strong><\/td>\n<td>Long-(Arg3) insulin-like growth factor-I; Insulin-like growth factor long chain R3<\/td>\n<\/tr>\n<tr>\n<td><strong>Type de peptide<\/strong><\/td>\n<td>Modified IGF-1 analog<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The extended structure and Arg3 substitution distinguish IGF-1 LR3 from native IGF-1 and form the basis for much of the research surrounding its receptor interactions and IGFBP binding characteristics.<\/p>\n<hr \/>\n<h2>Receptor Grade IGF-1 LR3 Research and Studies<\/h2>\n<h2>IGF-1 LR3 and Tissue Anabolism<\/h2>\n<h3>Objectif de l'\u00e9tude<\/h3>\n<p>Researchers have investigated IGF-1 LR3 to understand how structural modifications to IGF-1 might influence anabolic signaling and tissue growth in experimental models.<\/p>\n<h3>M\u00e9thodologie<\/h3>\n<p>One study compared IGF-1 LR3 with native IGF-1 in normal and dexamethasone-induced catabolic animal models. Researchers examined parameters associated with anabolic activity, including body weight, organ weight, feed efficiency, and markers of protein degradation.<\/p>\n<h3>R\u00e9sultats<\/h3>\n<p>The researchers reported stronger effects from IGF-1 LR3 than native IGF-1 under certain experimental conditions. The study also reported changes in <strong>N\u03c4-methylhistidine excretion<\/strong>, a marker researchers use to investigate muscle protein degradation.<\/p>\n<h3>Importance scientifique<\/h3>\n<p>These findings have contributed to interest in IGF-1 LR3 as a laboratory model for studying growth-factor signaling and protein metabolism.<\/p>\n<p>Importantly, these findings come from experimental models and should not be interpreted as evidence of equivalent effects in humans.<\/p>\n<hr \/>\n<h2>IGF-1 LR3 and Growth-Factor Research<\/h2>\n<p>IGF-1 research has historically focused on the relationship between growth hormone (GH), IGF-1, and cellular growth.<\/p>\n<p>Researchers have developed recombinant and modified IGF-1 compounds to investigate these relationships under controlled experimental conditions.<\/p>\n<p>One example is recombinant human IGF-1 (rhIGF-1), which has been studied in experimental models involving IGF-1 deficiency and growth-related disorders. These studies provide broader context for understanding IGF signaling but should not be interpreted as direct evidence for the activity of IGF-1 LR3.<\/p>\n<p>For researchers investigating growth-factor signaling, related compounds such as <a href=\"https:\/\/actinpeptides.com\/fr\/product\/mgf-5mg\/\">MGF<\/a> provide additional models for examining peptide-mediated cellular signaling.<\/p>\n<hr \/>\n<h2>IGF-1 LR3 and Metabolic Signaling<\/h2>\n<h3>Objectif de l'\u00e9tude<\/h3>\n<p>Scientists have investigated whether IGF-related compounds influence glucose uptake and cellular energy metabolism.<\/p>\n<h3>Mechanistic Research<\/h3>\n<p>Studies have focused on signaling networks involving:<\/p>\n<ul>\n<li>IGF-1 receptors<\/li>\n<li>PI3K<\/li>\n<li>Akt<\/li>\n<li>AMPK<\/li>\n<li>GLUT4<\/li>\n<\/ul>\n<p>PI3K-Akt signaling can influence the movement of glucose transporters toward the cell membrane, while AMPK functions as an energy-sensing pathway.<\/p>\n<h3>Importance scientifique<\/h3>\n<p>These observations make IGF-related peptides relevant to laboratory research examining the relationship between growth-factor signaling and cellular metabolism.<\/p>\n<p>However, laboratory findings do not establish that IGF-1 LR3 produces a particular metabolic outcome in humans.<\/p>\n<hr \/>\n<h2>IGF-1 LR3 and Muscle Research<\/h2>\n<p>Researchers have also examined IGF-1 analogs in relation to muscle-cell signaling.<\/p>\n<p>One experimental study involving female mice investigated whether IGF-1 analogs, including IGF-1 LR3, could influence <strong>myostatin-related signaling<\/strong>.<\/p>\n<p>Myostatin is a growth-regulatory protein involved in skeletal muscle development and differentiation. Scientists study myostatin because changes in its signaling can alter experimental models of muscle-cell growth.<\/p>\n<p>The research suggested that IGF-1 analogs could influence pathways associated with muscle-cell survival and differentiation.<\/p>\n<p>These findings contribute to the broader field of <strong>IGF-1 LR3 muscle research<\/strong>, although they remain experimental and do not establish human performance or muscle-growth effects.<\/p>\n<p>For researchers examining related growth-factor systems, Actin Peptides also provides <a href=\"https:\/\/actinpeptides.com\/fr\/product\/mgf-5mg\/\">MGF research material<\/a> et <a href=\"https:\/\/actinpeptides.com\/fr\/product\/follistatin-344-1mg\/\">Follistatine-344<\/a> as additional research compounds with distinct molecular targets.<\/p>\n<hr \/>\n<h2>What Are the Potential Research Applications of IGF-1 LR3?<\/h2>\n<p>Current research interests surrounding IGF-1 LR3 include:<\/p>\n<ul>\n<li>IGF-1 receptor signaling<\/li>\n<li>Growth-factor biology<\/li>\n<li>Prolif\u00e9ration cellulaire<\/li>\n<li>Protein metabolism<\/li>\n<li>Glucose uptake<\/li>\n<li>PI3K-Akt signaling<\/li>\n<li>AMPK-related metabolism<\/li>\n<li>Muscle-cell signaling<\/li>\n<li>Myostatin research<\/li>\n<li>Autocrine and paracrine signaling<\/li>\n<li>IGF-binding protein interactions<\/li>\n<\/ul>\n<p>These applications describe <strong>research areas<\/strong>, rather than established medical uses.<\/p>\n<hr \/>\n<h2>What Makes Receptor Grade IGF-1 LR3 Unique?<\/h2>\n<p>IGF-1 LR3 differs from native IGF-1 because researchers modified its molecular structure by extending the N-terminal region and replacing the amino acid at position 3 with arginine.<\/p>\n<p>These changes may alter its interaction with IGF-binding proteins and influence how researchers can study IGF-mediated signaling in laboratory systems.<\/p>\n<p>Le <strong>Receptor Grade<\/strong> designation refers to the material&#8217;s intended research-grade purity classification and should not be interpreted as evidence of regulatory approval or clinical suitability.<\/p>\n<hr \/>\n<h2>Receptor Grade IGF-1 LR3 vs. Native IGF-1<\/h2>\n<table>\n<thead>\n<tr>\n<th>Caract\u00e9ristiques<\/th>\n<th>Native IGF-1<\/th>\n<th>IGF-1 LR3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Amino acids<\/td>\n<td>70<\/td>\n<td>83<\/td>\n<\/tr>\n<tr>\n<td>N-terminal extension<\/td>\n<td>Non<\/td>\n<td>Oui<\/td>\n<\/tr>\n<tr>\n<td>Arg3 modification<\/td>\n<td>Non<\/td>\n<td>Oui<\/td>\n<\/tr>\n<tr>\n<td>IGFBP interaction<\/td>\n<td>Stronger<\/td>\n<td>Altered\/reduced in research<\/td>\n<\/tr>\n<tr>\n<td>Research focus<\/td>\n<td>Natural growth-factor signaling<\/td>\n<td>Modified IGF signaling<\/td>\n<\/tr>\n<tr>\n<td>Application<\/td>\n<td>Biological and laboratory research<\/td>\n<td>Primarily laboratory research<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h2>Foire aux questions<\/h2>\n<h3>What is Receptor Grade IGF-1 LR3?<\/h3>\n<p>Receptor Grade IGF-1 LR3 is an 83-amino-acid synthetic analog of IGF-1. Researchers study it to investigate IGF receptor signaling, IGF-binding protein interactions, cellular metabolism, protein synthesis, and growth-factor biology.<\/p>\n<h3>How does IGF-1 LR3 work?<\/h3>\n<p>Research suggests that IGF-1 LR3 may interact with IGF-related signaling systems involving IGF-1 receptors and downstream pathways such as PI3K-Akt. Its structural modifications may also alter interactions with IGF-binding proteins.<\/p>\n<h3>What is IGF-1 LR3 researched for?<\/h3>\n<p>IGF-1 LR3 research includes growth-factor signaling, cellular metabolism, protein metabolism, muscle-cell signaling, receptor biology, and IGFBP interactions.<\/p>\n<h3>What is the difference between IGF-1 and IGF-1 LR3?<\/h3>\n<p>Native IGF-1 contains 70 amino acids, whereas IGF-1 LR3 contains 83. IGF-1 LR3 incorporates an extended N-terminal sequence and an arginine substitution at position 3.<\/p>\n<h3>Is IGF-1 LR3 approved for human use?<\/h3>\n<p>This research-grade product is not presented as an FDA-approved medication or as a product intended for human consumption. Its use on this page is limited to laboratory and research applications.<\/p>\n<h3>Where can researchers buy IGF-1 LR3?<\/h3>\n<p>Researchers seeking <strong>IGF-1 LR3 peptide for sale<\/strong> should evaluate product identity, purity documentation, analytical testing, storage information, and supplier transparency before purchasing research materials. <a href=\"https:\/\/actinpeptides.com\/fr\/\">Peptides d'actine<\/a> provides Receptor Grade IGF-1 LR3 as a research and laboratory product.<\/p>\n<hr \/>\n<h2>Recherche sur les peptides connexes<\/h2>\n<p>Researchers exploring IGF-1 LR3 may also investigate other compounds associated with growth-factor, cellular signaling, and metabolic research.<\/p>\n<p>Relevant Actin Peptides research products include:<\/p>\n<ul>\n<li><a href=\"https:\/\/actinpeptides.com\/fr\/product\/mgf-5mg\/\">Peptide MGF<\/a> \u2014 research involving growth-factor and muscle-cell signaling<\/li>\n<li><a href=\"https:\/\/actinpeptides.com\/fr\/product\/follistatin-344-1mg\/\">Follistatine-344<\/a> \u2014 research involving myostatin-related pathways<\/li>\n<li><a href=\"https:\/\/actinpeptides.com\/fr\/product\/ace-031-1mg\/\">ACE-031<\/a> \u2014 research involving activin receptor signaling<\/li>\n<li><a href=\"https:\/\/actinpeptides.com\/fr\/product\/aod-9604-5mg\/\">AOD-9604<\/a> \u2014 research involving growth-hormone-derived peptide signaling<\/li>\n<li><a href=\"https:\/\/actinpeptides.com\/fr\/product\/mots-c-10mg\/\">MOTS-C<\/a> \u2014 research involving cellular metabolism and mitochondrial signaling<\/li>\n<\/ul>\n<p>These compounds have different structures and biological targets, so they should not be considered interchangeable with IGF-1 LR3.<\/p>\n<hr \/>\n<h2>Conclusion<\/h2>\n<p><strong>Peptide IGF-1 LR3 de qualit\u00e9 r\u00e9cepteur<\/strong> is a modified IGF-1 analog that researchers study because its extended N-terminal structure and Arg3 substitution may alter IGF-binding protein interactions and growth-factor signaling.<\/p>\n<p>Research has explored its potential role in IGF-1 receptor signaling, PI3K-Akt pathways, glucose metabolism, protein metabolism, muscle-cell biology, and myostatin-related research. Experimental models have generated findings of scientific interest, but the available evidence remains primarily preclinical.<\/p>\n<p>For this reason, IGF-1 LR3 should be discussed in terms of <strong>research applications and molecular mechanisms rather than established therapeutic effects<\/strong>.<\/p>\n<h2>Avertissement relatif \u00e0 la recherche<\/h2>\n<p><strong>Receptor Grade IGF-1 LR3 peptide is available strictly for research and laboratory purposes only. It is not approved for human consumption, therapeutic use, or diagnostic applications. Please review our <a href=\"https:\/\/actinpeptides.com\/fr\/terms\/\">Termes et conditions<\/a> avant de passer commande.<\/strong><\/p>","protected":false},"excerpt":{"rendered":"<div class=\"et_pb_module et_pb_wc_description et_pb_wc_description_0_tb_body et_pb_bg_layout_light et_pb_text_align_left\">\n<div class=\"et_pb_module_inner\">\n<p>Dosage : 1 mg<br \/>\nContents: Receptor Grade IGF-1 LR3 (1mg)<br \/>\nForm: Lyophilized powder<br \/>\nPurity: &gt;99%<\/p>\n<p><strong>FREE Shipping on $200+ orders<\/strong><\/p>\n<\/div>\n<\/div>\n<div class=\"wccs-bulk-pricing-table-container\" data-product=\"239\">\n<table class=\"wccs-bulk-pricing-table wccs-horizontal-table\">\n<tbody>\n<tr>\n<th>Quantity<\/th>\n<th data-type=\"quantity\" data-quantity-min=\"5\" data-quantity-max=\"8\">5 \u2013 8<\/th>\n<th data-type=\"quantity\" data-quantity-min=\"9\" data-quantity-max=\"\">9 +<\/th>\n<\/tr>\n<tr>\n<td>Discount<\/td>\n<td data-type=\"discount\" data-quantity-min=\"5\" data-quantity-max=\"8\">5%<\/td>\n<td data-type=\"discount\" data-quantity-min=\"9\" data-quantity-max=\"\">10%<\/td>\n<\/tr>\n<tr>\n<td>Prix<\/td>\n<td data-type=\"price\" data-quantity-min=\"5\" data-quantity-max=\"8\"><strong><span class=\"woocommerce-Price-amount amount\"><bdi><span class=\"woocommerce-Price-currencySymbol\">$<\/span>142.50<\/bdi><\/span><\/strong><\/td>\n<td data-type=\"price\" data-quantity-min=\"9\" data-quantity-max=\"\"><strong><span class=\"woocommerce-Price-amount amount\"><bdi><span class=\"woocommerce-Price-currencySymbol\">$<\/span>135.00<\/bdi><\/span><\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>","protected":false},"featured_media":7030,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_cat":[72,30,79],"product_tag":[1715,1702],"class_list":["post-138","product","type-product","status-publish","has-post-thumbnail","product_brand-actin-peptides","product_cat-hormone-peptides","product_cat-muscle-growth-peptides","product_cat-peptides","product_tag-1mg-igf-1-lr3","product_tag-igf-1-lr3-1mg","first","instock","shipping-taxable","purchasable","product-type-simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.6.1 (Yoast SEO v28.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Receptor Grade IGF-1 LR3 (1mg) - ACTIN PEPTIDES<\/title>\n<meta name=\"description\" content=\"Buy Receptor Grade IGF-1 LR3 (1mg) online. 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