Figure 6

Reduced cytotoxic activity of NK cells against hepatoma cells treated with TM for 24 h. The susceptibility of SMMC7721 cells (left) and HepG2 cells (right) to NK cell cytolysis was determined using the LDH cytotoxicity assay. The NK cells were incubated with SMMC7721 or HepG2 cells at the indicated effecter/target ratios. Data were presented as means ± S.D., **P < 0.01.