Murine myoblast C2C12 according to [29 (link)] were cultured on conventional Petri dishes (BD Falcon) at 37°C and 5% CO2 in DMEM GlutaMAX (Gibco) supplemented with 10% heat-inactivated foetal bovine serum (FBS, EuroClone), penicillin (100 IU/mL, Gibco), and streptomycin (100 mg/mL, Gibco). All the experiments were conducted for 10 days starting from a cellular confluence of 50%, to obtain a high degree of differentiation, and cells were divided into two experimental groups: the control group cultured in growth medium and the treated group cultured in growth medium with the addition of TMPyP4 (Sigma-Aldrich) to a final concentration of 12 μM. Medium was changed every day as well as fresh addition of TMPyP4.
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