Lactate dehydrogenase release assay
Cells at a density of 2.0 × 105 cells/well were treated in the same protocol described above except at the indicated concentrations of suspensions. After 48 h incubation, the cultured cells were centrifuged at 430× g for 5 min and the cell medium was transferred to a new 96-well plate (50 μL/well). Upon the addition of the lactate dehydrogenase (LDH) reaction mixture (Promega, CytoTox 96R non-radioactive assay kit) to the wells (50 μL/well), they were kept in