Receptor Grade IGF-1 LR3 (100mcg)

Receptor Grade IGF-1 LR3 Peptide

Receptor Grade IGF-1 LR3 peptide is a research reagent examined in studies on cellular growth, IGF receptors, and IGF binding proteins. It contains an extended N-terminal structure of 13 amino acids and a replacement of the glutamic acid at residue 3. Additionally, the addition of arginine in the original sequence of recombinant IGF-1 (rhIGF-1), which ultimately leads to the formation of an 83 amino acid peptide. Hence, it is named IGF-1 Long R3.^[1,2] It appears to be potentially more influential on cellular activities than rhIGF-1 due to an apparent significant improvement in its biological activity. This is since it exhibits a stronger affinity for the IGF receptor and lower affinity towards other proteins that may inactivate it. Moreover, the classification of Receptor Grade refers to the purity of the material, which is considered higher than the standard Media Grade IGF-1 LR3. Media grate IGF-1 LR3 is routinely studied in cell cultures and as a research reagent, at an economical cost, for studies where biological potency is not crucial. Receptor Grade IGF-1 LR3 is considered the reagent of choice to achieve optimum results when performing any animal study and cell-based assays. Growth of mammalian cells in the presence of low concentrations of Long R3 IGF-1 appears to result in better productivity than standard concentrations of insulin and/or standard IGF-1.^[1] Researchers report that the peptide exhibited “equivalent or better performance using two recombinant CHO cell lines.” IGF-1 LR3 may be more capable of inducing the type 1 IGF receptor, potentially promoting an elevated level of intracellular signaling, cellular proliferation, and apoptosis inhibition.

Specifications

Molecular Formula: C₄₀₀H₆₂₅N₁₁₁O₁₁₅S₉

Molecular Weight: 9117.5 g/mol

Sequence: MFPAMPLSSL FVNGPRTLCG AELVDALQFV CGDRGFYFNK PTGYGSSSRR APQTGIVDEC CFRSCDLRRL EMYCAPLKPA KSA

Receptor Grade IGF-1 LR3 Research

Receptor Grade IGF-1 LR3 and Biological Activity
The peptide appears to bring about a more pronounced but short-lived impact than IGF-1 through a potential resistance in the association of inactivating proteins such as IGF binding proteins (IGFBPs).^[2] Insulin-like Growth Factor Binding Proteins (IGFBPs) are a category of proteins that may regulate the availability of Insulin-like Growth Factors (IGFs) within the bloodstream, possibly influencing their interactions with various tissues. It is conceivable that a decrease in the binding affinity of IGF-1 LR3 for IGFBPs might affect its bioavailability, potentially reducing its duration of action. Additionally, this weakened binding might alter how IGF-1 LR3 engages with targeted tissues in experimental settings. These changes could potentially enhance the potency of IGF-1 LR3, although possibly shortening its active duration. This suggests that the interactions between IGF-1 LR3 and IGFBPs might determine the functional outcomes of IGF-1 LR3 in specific experimental contexts. Consequently, this may result in IGF-1 LR3 being more potent but with a shorter duration of action compared to recombinant Insulin-like Growth Factor 1 (rhIGF-1). Studies in murine models indicate that IGF-1 LR3 may be cleared from the plasma faster, to be destributed more quickly into various tissue models as compared to IGF-1.^[3] The investigation into the tissue distribution patterns of IGF-1 LR3 suggested it might localize differently from IGF-1. Notably, elevated levels of IGF-1 LR3 were observed in specific tissues, including the kidneys, ovaries, and adrenal glands in murine models. ^[1] This distinct localization pattern implies that organs primarily involved in metabolic and reproductive functions might have different abilities to absorb or retain IGF-1 LR3 compared to IGF-1. It is speculated that these observed differences might be due to IGF-1 LR3’s reduced tendency to bind with IGF-binding proteins (IGFBPs). This reduced binding may affect its bioavailability and interactions with target tissues in experimental models. However, there is a hypothesis that a peptide with similar modifications, specifically the R3 modification found in IGF-1 LR3, may possess greater anabolic potential than regular IGF-1 despite a shorter duration of action. Further research is necessary to understand these mechanisms and their implications fully.^[4]

Receptor Grade IGF-1 LR3 and Insulin-Like Growth Factor Receptor Interactions
Naturally produced IGF-1 hormones interact with at least two cell surface receptors: the IGF-1 receptor (IGF-1R) and the insulin receptor.^[5] The researchers also note that “IR and IGF1R act as identical portals to the regulation of gene expression, with differences between insulin and IGF-1 effects due to a modulation of the amplitude of the signal created by the specific ligand-receptor interaction.” The IGF-1R is referred to as the “physiologic” receptor due to its potential higher affinity (approximately 100 times higher) for IGF-1 as compared to the insulin receptor. The association of IGF-1 and IGF-1R apparently leads to changes in metabolism, prevention of cell death (apoptosis), promotion of cell growth (hypertrophy), differentiation and cell division (hyperplasia), normal development, and even malignant growth. IGF-1R has been researched for its involvement in diverse types of cancer, such as prostate, breast, and lung cancer.^[6] IGF-1 also appears to stimulate insulin receptors and activate them, thereby promoting glucose uptake from the bloodstream by cells. IGF-1 displays a three-fold influence on muscle cells.

Receptor Grade IGF-1 LR3 and Muscle Cells
Preliminary research utilizing murine models suggests that IGF-1 LR3 might have significant anabolic (muscle-building) actions. Specifically, a study examined its impact on both normal mice and those experiencing catabolic (muscle-wasting) conditions induced by dexamethasone, a synthetic steroid.^[7] The researchers noted that IGF-1 LR3 appeared to be roughly 2.5 times more potent than regular IGF-1 in producing anabolic actions. These observed actions included weight gain, an increase in the weight of internal organs (visceral organs), and possibly improved efficiency in converting feed into body mass. These findings were noted when the murine models were subjected to continuous exposure to IGF-1 LR3. Unfortunately, there are no studies investigating the direct potential of IGF-1 LR3 on muscle cells. Considering the similaritied between the two peptides, IGF-1 LR3 is expected to have similar actions on muscle cells as IGF-1.

Based on research, studies posit that IGF-1 may promote an increase in the number of muscle cells, also known as hyperplasia. Secondly, IGF-1 appears to influence the lifespan of satellite cells of the skeletal muscles.^[8] Satellite cells appear to provide nutritional support to muscle cells, helping them to operate efficiently. IGF-1 may help to build muscle tissue by improving the lifespan of these cells. Finally, IGF-1 appears to promote the differentiation of myoblasts.^[9] In other words, it may encourage the commitment of stem cell progeny from non-specific pluripotent stem cells to dedicated muscle tissue. To conclude, IGF-1 may improve muscle development by enhancing the rate at which generic stem cells are transformed into muscle cells.

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References