Previous findings have shown that the activity of the LDH released from damaged cells is proportional to the number of damaged neurons (McCord and Fridovich, 1969; Wang et al., 2015). After exposure to the drugs, 50 μl of the medium was removed, and the amount of LDH released from the cells was determined using a LDH kit (Solarbio Life Sciences, China) according to the manufacturer’s instructions. The absorbance of the samples was read spectrophotometrically at 450 nm. The results are expressed as the percentage of LDH released relative to that released from the control cells.
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