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Myostatin is a myokine that is produced and released by myocytes and acts on muscle cells to inhibit muscle growth. [7] Myostatin is a secreted growth differentiation factor that is a member of the TGF beta protein family. [8] [9] Myostatin is assembled and produced in skeletal muscle before it is released into the blood stream. [10]
Follistatin is an endogenous protein that negatively regulates myostatin. [3] Reduction of myostatin expression is one of the mechanisms for the effects of androgens in promoting muscle growth. Androgens both regulate myostatin expression directly and upregulate follistatin expression. [3]
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.
A moderate increase in protein consumption can help preserve muscle mass during weight loss. Meghan Garcia-Webb, ... such as activin and myostatin, that inhibit muscle growth.
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 ]
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 ]
Double-muscled cattle are breeds of cattle that carry one of seven known mutations that limits and reduces the activity of the myostatin protein. Normally, myostatin limits the number of muscle fibers present at birth, and interfering with activity of this protein causes animals to be born with higher numbers of muscle fibers, consequently augmenting muscle growth.
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