摘要Objective:The aim of this study was to investigate the inhibition effect of natural killer T (NKT) cells on transplantation hepatocellular carcinoma in mice. Methods:α-galactosylceramide (α-GalCer)-pulsed DC and HepS were prepared as stimulus. Hepatoma xenograft model was established and mice were randomly divided into 4 groups (n = 13 each group):(1)control group, intravenous injection of the same volume of saline. (2) mature DC group, intravenous injection of mature DC cells (4 × 106 cells). (3) α-GalCer-pulsed HepS group, intravenous injection of α-GalCer-pulsed HepS (4 × 106 cells). (4) α-GalCer -pulsed mature DC group, intravenous injection of α-GalCer-pulsed DC (4 × 106 cells). The changes of tumor volume in mice and survival period were measured every 2 days. Percentage of NKT cells in spleens and cytotoxicity of spleen cells were detected by flow cytometry. Tumor tissues were analyzed by histopathological examination. Results:In α-GalCerpulsed Heps and DC groups, the average survival period was prolonged and tumor volume was markedly decreased, spleen cells and NKT cells were significantly increased, and tumor necrosis was evident, compared to the control group. Conclusion:α-GalCer-pulsed DC and HepS could activate NKT cells in vivo, also increase NKT cells cytotoxicity, inhibit the growth of hepatomas and prolong survival period.