目的 观察P53和端粒酶反转录酶(TERT)基因特异性细胞毒性T淋巴细胞(CTL)对肝癌细胞的杀伤活力。方法 采用携带P53和TERT基因的腺病毒感染树突状细胞(DC),并将其作为抗原提呈细胞诱导P53和TERT基因特异性CTL,采用流式细胞术检测P53和TERT基因特异性CTL INF-γ和TNF-α分泌情况;采用乳酸脱氢酶法检测P53和TERT基因特异性CTL对肝癌细胞杀伤情况。结果 单纯DC细胞诱导CTL、P53基因特异性CTL及TERT基因特异性CTL中,分泌INF-γ的细胞百分比分别为(5.8±1.6)%、(14.8±3.7)%及(17.4±5.4)%,分泌TNF-α的细胞百分比分别为(6.1±1.3)%、(10.9±2.5)%及(15.4±3.2)%,P53和TERT基因特异性CTL的INF-γ和TNF-α分泌水平均较单纯DC细胞诱导CTL高(P〈0.001)。P53基因特异性CTL在10∶1、20∶1、40∶1和80∶1效靶比情况下对肝癌细胞的杀伤效率分别为(11.7±3.4)%、(18.4±5.6)%、(28.6±5.4)%和(44.8±7.2)%,TERT基因特异性CTL在10∶1、20∶1、40∶1和80∶1效靶比情况下对肝癌细胞的杀伤效率分别为(14.5±3.9)%、(21.7±4.5)%、(32.6±6.1)%和(50.8±6.9)%,均较单纯DC细胞诱导产生的CTL对肝癌细胞的杀伤效率[(5.4±1.5)%、(10.8±4.2)%、(17.7±3.9)%、(25.4±5.8)%]显著升高(P〈0.001)。结论 P53和TERT基因诱导产生的CTL具有更强的肝癌细胞杀伤活性,可望成为肝癌有效的过继治疗手段。
Objective To observe the cancer killing activity of specific cytotoxic T lymphocytes induced by P53 and telomerase reverse transcriptase( TERT) genes for hepatic carcinoma cells. Methods Dendritic cells( DC) were infected by adenovirus carrying P53 and TERT genes. The adenovirus-infected DCs were used as antigen-presenting cells and induced P53 and TERT gene-specific cytotoxic T lymphocyte( CTL). The proportions of P53 and TERT gene-specific CTL secreting interferon( IFN)-γ and tumor necrosis factor( TNF)-αwere detected by cytometry. The cancer killing activity of P53 and TERT gene-specific CTL was detected using lactate dehydrogenase assay.Results For CTL induced by DC alone,specific CTL induced by P53 gene and specific CTL induced by TERT gene,the proportions of cells secreting IFN-γ were( 5. 8 ± 1. 6) %,( 14. 8 ± 3. 7) % and( 17. 4 ± 5. 4) %,respectively,and the proportions of cells secreting TNF-α were( 6.1 ±1.3) %,( 10.9 ±2.5) % and( 15.4 ±3.2) %,respectively. The levels of cells secreting IFN-γ and TNF-α in P53 and TERT gene-specific CTL were higher than those in CTL induced by DC alone( P〈0. 001). The cancer cell killing efficiencies of P53 gene-specific CTL with the ratio of 10 ∶ 1,20 ∶ 1,40 ∶ 1 and 80 ∶ 1 were( 11. 7 ± 3. 4) %,( 18. 4 ± 5. 6) %,( 28. 6 ± 5. 4) % and( 44. 8 ± 7. 2) %,respectively,and the cancer cell killing efficiencies of TERT gene-specific CTL with the ratio of 10 ∶ 1,20 ∶ 1,40 ∶ 1 and 80 ∶ 1 were( 14. 5 ± 3. 9) %,( 21. 7 ± 4. 5) %,( 32. 6 ± 6. 1) % and( 50. 8 ± 6. 9) %,respectively,which were significantly higher compared to those of CTL induced by DC alone(( 5. 4 ± 1. 5) %,( 10. 8 ± 4. 2) %,( 17. 7 ± 3. 9) % and( 25. 4 ± 5. 8) %,respectively,P〈0. 001). Conclusion CTLs induced by P53 and TERT genes have more stronger killing activity for hepatic carcinoma cells,and it is expected to be an effective approach for hepatic cancer.