Determination of mitochondrial activity by MTT assay
The MTT assay was used to measure mitochondrial activity as
previously described with minor modifications [14]. After exposure
to the treatments, the cell culture medium was discarded,
and the cells were incubated with 100 mL of MTT solution
(0.5 mg/mL in DMEM, 2 h at 37 °C, 5% CO2). The MTT solution was
discarded, and 100 mL of DMSO was added to each well. Optical
density was read on a microplate reader at 550 nm.