
Categorías: IGF-1 Proteins
Secuencia: MFPAMP LSSLF VNGPR TLCGA ELVDALOFVC GDRGF YFNKP TGYGS SSRRA POTGIVDECCFR SCDLRR LEMY CAPLK PAKSAMasa molar: 9.111 Da
Sinónimos: Arg3 largo lGF-1 (grado de receptor)
IGF-1 R3 largo, grado receptor
IGFB Binding andThe increasedBiological Activityof Long R3 IGF-1
Al resistir la unión de lGFBP, el IGF-1 LR3 tiene un efecto mayor que el IGF-1. La mayor duración de la acción permite utilizar cantidades más pequeñas con los mismos efectos. Se ha demostrado que algunos derivados del IGF-1, como el derivado GPE, formado sólo por los tres últimos aminoácidos N-terminales de la proteína IGF-1, tienen efectos terapéuticos en lesiones neurológicas como el accidente cerebrovascular. La mayoría de los estudios sobre los efectos de los derivados de IGF-1 se han llevado a cabo en modelos animales no humanos o en estudios de cultivos celulares.
Insulin Like GrowthFactor Receptornteractions
IGF-1 binds to at least two cell surface receptors: lGF-1R and the insulin receptor. TheIGF-1 receptor is referred to as the “physiologic” receptor because lGF-1 binds to it withsignificantly higher affinity (approximately 100 times higher) than it does to the insulinreceptor. By binding to IGF-1R, IGF-1 can affect metabolism, cell growth (hypertrophy),differentiation and cell division (hyperplasia), prevention of cell death (apoptosis), normaldevelopment, and even malignant growth. lGF-1R has been implicated in severaldifferent types of cancer include breast, prostate, and lung cancer. lGF-1 also binds to theinsulin receptor and activates it, thereby encouraging cells to take up glucose from theblood stream. The effects of lGF-1 on muscle cells are three-fold. Firstly, IGF-1encourages hyperplasia, or an increase in the number of muscle cells. Secondly, IGF-1has 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 helpingthem to operate efficiently. By increasing the lifespan of these cells, lGF-1 helps toincrease their number with muscle tissue. Finally, IGF-1 encourages differentiation ofmyoblasts, which is to say that it encourages the conversion of stem cell progeny fromnonspecific pluripotent stem cells into dedicated muscle tissue. In this way, IGF-1increases the rate of muscle development by increasing the rate at which generic stemcells are converted to muscle cells.
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