
Категории: IGF-1 Proteins
Последовательность: MFPAMP LSSLF VNGPR TLCGA ELVDALOFVC GDRGF YFNKP TGYGS SSRRA POTGIVDECCFR SCDLRR LEMY CAPLK PAKSAМолярная масса: 9,111 Да
Синонимы: Длинный Arg3 lGF-1 (рецепторный класс)
Длинный R3 IGF-1, рецепторный уровень
IGFB Binding andThe increasedBiological Activityof Long R3 IGF-1
Сопротивляясь связыванию lGFBP, IGF-1 LR3 оказывает больший эффект, чем lGF-1. Более продолжительное действие позволяет использовать меньшие количества с тем же эффектом. Было показано, что некоторые производные IGF-1, такие как производное GPE, состоящее только из трех последних N-концевых аминокислот белка lGF-1, оказывают терапевтический эффект при неврологических травмах, таких как инсульт. Большинство исследований, касающихся эффектов производных IGF-1, было проведено на моделях животных, отличных от человека, или исследованиях на клеточных культурах.
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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