| Summary: | Yang Liu,1 Yue-ru Wang,2 Guang-hui Ding,1 Ting-song Yang,1 Le Yao,1 Jie Hua,1 Zhi-gang He,1 Ming-ping Qian1 1Department of Hepatobiliary Surgery, Shanghai 10th People’s Hospital, School of Medicine, Tongji University, Shanghai, People’s Republic of China; 2Department of Infection, Shanghai First People’s Hospital Affiliated to Jiaotong University, Shanghai, People’s Republic of China Objective: Combination therapy for cancer is more effective than using only standard chemo- or radiotherapy. Our previous results showed that dendritic cell-activated α-fetoprotein (AFP)-specific T-cells inhibit tumor in vitro and in vivo. In this study, we focused on antitumor function of CD8+ T-cells combined with or without JAK2 inhibitor. Methods: Proliferation and cell cycle were analyzed by CCK-8 and flow cytometry. Western blot was used to analyze the expression level of related protein and signaling pathway. Results: We demonstrated reduced viability and induction of apoptosis of tumor cells with combination treatment. Intriguingly, cell cycle was blocked at the G1 phase by using AFP-specific CD8+ T-cells combined with JAK2 inhibitor (AG490). Furthermore, an enhanced expression of BAX but no influence on Fas/FasL was detected from the tumor cells. Conclusion: These results indicate a Fas/FasL-independent pathway for cellular apoptosis in cancer therapies with the treatment of AFP-specific CD8+ T-cells combined with JAK2 inhibitor. Keywords: AFP-specific CD8+ T-cells, JAK2 inhibitor, Fas/FasL signal, antitumor, apoptosis
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