NCIt definition : A human monoclonal antibody directed against type II activin receptors (ActRII; ActR2),
with potential muscle-sparing and anti-cachectic activities. Upon administration,
bimagrumab binds to ActRII, which prevents the binding of the natural ligands, myostatin
and activin, to activin receptors and blocks ActRII-mediated signaling. This increases
protein synthesis, decreases protein degradation, stimulates skeletal muscle cell
growth, and increases muscle function and strength. Overstimulation of the ActRII-mediated
signaling pathway is associated with muscle loss and weakness.;