Scratch wound closure of C2C12 mouse myoblasts is enhanced by human platelet lysate

The effect of a platelet lysate (PL) on muscle wound healing, based on in vitro scratch wound of C2C12 mouse myoblasts, has been investigated. Cell viability assays show that PL induced an increase in cell proliferation at concentrations of 1-20%, but was slightly cytotoxic at 100%. PL promoted wound closure after scratch wounding of cell monolayers. The p38 inhibitor SB203580 and the PI3K inhibitor, wortmannin, decreased the PL effect, whereas the ERK inhibitor, PD98059, did not. Transwell migration of cells was also increased by PL, and although SB203580 abrogated this effect, wortmannin reduced it, whereas PD98059 was ineffective. Western blot analyses of scratch wounded cells showed activation of AKT and p38, while in the presence of PL there was a faster and sustained activation of AKT and p38 (up to 6 h), and a transient activation of ERK1/2. Taken together, the data show that PL promotes C2C12 wound healing by enhancing cell proliferation and motility.