Results of a luciferase reporter assay of the
activities of myostatin
inhibitory d-peptides. (A) 7c-ri, (B) MID-35,
and (C) MID-36 and MID-39. Cells, HEK293-cell-transfected Smad-responsive
reporter (pGL4.48[luc2P/SBE/Hygro]) and control (pGL4.74[hRluc/TK])
plasmids; peptide concentration, 0.3 μM; positive control (prodomain,
mouse recombinant) concentration, 10 nM; myostatin concentration,
8 ng/mL (0.32 nM); starvation with serum-free DMEM, 8 h; incubation
with or without peptides, 4 h. Values represent means ± SD (N = 3).