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IGF-1 LR3 Peptide

IGF-1 LR3 Peptide

IGF-1 is a peptide roughly the same structure and size as insulin, or about 70 amino acids long. It belongs to the peptide family of substances identified as growth factors. It is a highly anabolic hormone released in the liver as well as in peripheral tissues such as skeletal muscle. In the body, IGF-1 is released in response to the presence of Human Growth Hormone (HGH). After intense resistance training, the body experiences a surge in GH and IGF, and this is one way that new muscle is built. Although GH is considered to be highly anabolic, in actuality, IGF-1 is suspected to be responsible for the primary anabolic activities of GH.

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IGF-1 LR3


Insulin Like Growth Factor 1 Long R3


IGF-1 is a peptide roughly the same structure and size as insulin, or about 70 amino acids long. It belongs to the peptide family of substances identified as growth factors. It is a highly anabolic hormone released in the liver as well as in peripheral tissues such as skeletal muscle. In the body, IGF-1 is released in response to the presence of Human Growth Hormone (HGH). After intense resistance training, the body experiences a surge in GH and IGF, and this is one way that new muscle is built. Although GH is considered to be highly anabolic, in actuality, IGF-1 is suspected to be responsible for the primary anabolic activities of GH.

 

IGF-1 builds new muscle tissue by promoting nitrogen retention and protein synthesis. This causes the growth of muscles through both hyperplasia (which is an increase in number of muscle cells) and mitogenesis (which is the actual growth of new muscle fibers). Thus IGF-1 not only makes muscle fibers bigger, it makes more of them as well.
 

IGF-1’s effects are not limited to building new muscle, however. It has a potent effect on lipid (fat) metabolism, and helps the body burn fat at a significantly elevated rate. In addition, IGF-1 is both a neuroprotector and neuropromotor, which improves mental functions such as reflexes, memory, and learning ability. IGF is also important for production of connective tissue and insuring proper bone density.

Although IGF-1 is very potent at building muscle and burning fat, the Lr3 IGF-1 version is roughly 2-3x as powerful.

 

Lr3 IGF-1 (Long R3 Insulin-like Growth Factor-I or Long R3IGF-I) is an 83 amino acid analog of human IGF-I actually comprising the complete human IGF-1 sequence but with the substitution of an Arg for the Glu at position 3, as well as a 13 amino acid extension peptide at the N-terminus. This makes Long R3IGF-I significantly more potent (2-3x) than IGF-I in studies, because it has a lower affinity to be rendered inactive by IGF binding proteins, and consequently more potential activity in the body.


Molar Mass: 9117.5 g/mol

Molecular Formula:C400H625N111O115S9
CAS Number: 946870-92-4
What is IGF-1 LR3?

 
What is IGF-1 LR3?

 

IGF-1 LR3, also known as Long Arg3 IGF-1, is a recombinant protein analogue of human Insulin-Like Growth Factor-1 that has a molar mass of 9,200 Daltons and is comprised of 83 amino acids. IGF-1 LR3 comprises the complete IGF-1 sequence, but with a 13 amino acid extension on the B-Terminus domain and the substitution of an Arginine for the Glutamic Acid at position 3. The LR3 analogue of IGF-1 was created with the intent to drastically increase the biological activity of the protein and IGF-LR3 is several times more potent than rhIGF-1. This specific sequence alteration has decreased the affinity of binding to the IGFBPs, which control the biological actions of IGF-1 and prevent the protein from reaching the IGF-1 receptors.

 

IGF-1 LR3 is an 83 amino acid analogue of human IGF-1 that has been modified to include a 13 amino acid extension on its N-Terminus and the substitution of an Arginine amino acid for Glutamine at position 3.

 

While IGF-1 LR3 is comprised of the the complete human IGF-1 sequence, these modifications have rendered the LR3 version to be much more potent than IGF-1 in-vitro and in-vivo. The result of these modifications is that IGF-1 LR3 does not bind as strongly to the IGFBPs, which modify the biological actions of IGF-1. Resultantly, IGF-1 LR3 binds to the type 1 IGF-1 receptor with similar affinity to that of wild type IGF-1, but with higher biological activity and has several advantages over recombinant insulin.

 

The supplementation of mammalian cell cultures with Long R3 IGF-1 at a much lower concentration results in more highly elevated productivity than with standard concentrations of insulin and/or standard IGF-1. IGF-1 LR3 is better able to stimulate the type 1 IGF receptor and thus induce a higher level of activation of intracellular signaling, which is responsible for promoting cell proliferation and the inhibition of apoptosis.
What is the Amino Acid Sequence of IGF-1 LR3?

The amino acid sequence (three letter) is Met-Phe-Pro-Ala-Met-Pro-Leu-Ser-Ser-Leu-Phe-Val-Asn-Gly-Pro-Arg-Thr-Leu-Cys-Gly-Ala-Glu-Leu-Val-Asp-Ala-Leu-Gln-Phe-Val-Cys-Gly-Asp-Arg-Gly-Phe-Tyr-Phe-Asn-Lys-Pro-Thr-Gly-Tyr-Gly-Ser-Ser-Ser-Arg-Arg-Ala-Pro-Gln-Thr-Gly-Ile-Val-Asp-Glu-Cys-Cys-Phe-Arg-Ser-Cys-Asp-Leu-Arg-Arg-Leu-Glu-Met-Tyr-Cys-Ala-Pro-Leu-Lys-Pro-Ala- Lys-Ser-Ala

 

Receptor Grade vs Media Grade IGF-1 LR3

Genuine Receptor Grade LR3 IGF-I is a high quality research reagent for use in studies on cell growth, IGF receptors and IGF binding proteins and is more potent than rH IGF-1 and Media Grade IGF-1 LR3 both in vivo and in vitro due to the drastic increase in biological activity (stronger affinity for binding with the IGF receptor) and high-level purity. This combination of increased biological activity and purity is what sets Receptor Grade IGF-1 LR3 apart from standard IGF-1. Media grade LR3 IGF-I is more commonly used in commercial cell culture vs mammalian. It can also be used as a research reagent at an economical cost to enable studies where biological potency is of less value and higher quantities are required. To maximize results in an animal-based cell study or production Receptor Grade IGF-1 Long R3 should be used exclusively.

 

 

IGFB Binding and Increased Biological Activity

 

By resisting IGFBP-binding, IGF-1 LR3 has a greater physiologic effect than IGF-1 does. The longer duration of action allows for smaller amounts to be used with the same effects. Some IGF-1 derivatives, such as the GPE derivative, made up of just the last three N-terminal amino acids of the IGF-1 protein, have been shown to have therapeutic effects in neurological injuries like stroke. Most studies concerning the effects of IGF-1 derivatives have been carried out in animal models, with little to no data available for humans.

 

 

Insulin Like Growth Factor Receptor Interactions

 

IGF-1 Long R3 binds to at least two cell surface receptors: IGF-1R and the insulin receptor. The IGF-1 receptor is referred to as the "physiologic" receptor because IGF-1 binds to it with significantly higher affinity (approximately 100 times higher) than it does to the insulin receptor. By binding to IGF-1R, IGF-1 can affect metabolism, cell growth (hypertrophy), differentiation and cell division (hyperplasia), prevention of cell death (apoptosis), normal development, and even malignant growth.

 

IGF-1R has been implicated in several different types of cancer include breast, prostate, and lung cancer. IGF-1 also binds to the insulin receptor and activates it, thereby encouraging cells to take up glucose from the blood stream. The effects of IGF-1 on muscle cells are three-fold. Firstly, IGF-1 encourages hyperplasia, or an increase in the number of muscle cells. Secondly, IGF-1 has a strong effect on skeletal muscle - In regards to the life span of satellite cells. Satellite cells support muscle cells, providing them with needed nutrients and helping them to operate efficiently. By increasing the lifespan of these cells, IGF-1 helps to increase their number with muscle tissue.

 

Finally, IGF-1 encourages differentiation of myoblasts, which is to say that it encourages the conversion of stem cell progeny from nonspecific pluripotent stem cells into dedicated muscle tissue. In this way, IGF-1 increases the rate of muscle development by increasing the rate at which generic stem cells are converted to muscle cells.

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