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In humans, the MSTN gene is located on the long (q) arm of chromosome 2 at position 32.2. [5] Myostatin (also known as growth differentiation factor 8, abbreviated GDF8) is a protein that in humans is encoded by the MSTN gene. [6] Myostatin is a myokine that is produced and released by myocytes and acts on muscle cells to inhibit muscle growth. [7]
Myostatin-related muscle hypertrophy is a rare genetic condition characterized by reduced body fat and increased skeletal muscle size. [1] Affected individuals have up to twice the usual amount of muscle mass in their bodies, but increases in muscle strength are not usually congruent. [ 2 ]
Androgens both regulate myostatin expression directly and upregulate follistatin expression. [3] YK-11, a selective androgen receptor modulator, is also a myostatin inhibitor. [4] [5] Resistance training reduces myostatin activity and increases follistatin activity. [6] Pharmacological myostatin inhibitors can therefore be considered exercise ...
The definition and use of the term myokine first occurred in 2003. [5] In 2008, the first myokine, myostatin, was identified. [4] [6] The gp130 receptor cytokine IL-6 (Interleukin 6) was the first myokine found to be secreted into the blood stream in response to muscle contractions.
Myostatin, a TGF-beta superfamily member, is a negative regulator of muscle growth. [1] Myostatin binds to ACVR2B and to a lesser extent ACVR2A. In mice that were ACVR2A −/− ( null ) mutants there was an increase in all four muscle groups studied ( pectoralis , triceps , quadriceps , and gastrocnemious / plantaris muscles). [ 1 ]
Non-proliferative, quiescent myosatellite cells, which adjoin resting skeletal muscles, can be identified by their distinct location between sarcolemma and basal lamina, a high nuclear-to-cytoplasmic volume ratio, few organelles (e.g. ribosomes, endoplasmic reticulum, mitochondria, golgi complexes), small nuclear size, and a large quantity of ...
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Activin and inhibin are two closely related protein complexes that have almost directly opposite biological effects. Identified in 1986, [1] [2] activin enhances FSH biosynthesis and secretion, and participates in the regulation of the menstrual cycle.