小鼠肝癌树突状细胞融合瘤苗抗肿瘤作用的研究

目的 探讨小鼠肝癌树突状细胞(D C)融合瘤苗抗肿瘤作用及其机制。 方法 用聚乙二醇(P E G)法制备小鼠肝癌D C融合瘤苗;流式细胞仪检测融合细胞表型特征;体内预防试验观察融合瘤苗免疫小鼠抵抗肿瘤攻击能力,乳酸脱氢酶(L D H)法检测其诱导的杀伤性T淋巴细胞活性;体内治疗试验观察荷瘤小鼠生存期及肿瘤组织中肿瘤坏死因子(TNF-α)、γ干扰素(IFN-γ)表达。 结果 小鼠肝癌D C融合瘤苗具备D C及肝癌细胞表型特征,能抵抗H 22小鼠肝癌细胞的攻击及诱导较强的细胞毒性T淋巴细胞(CTL)活性,DC/H22、DC H22、DC、H22各组CTL活性(A值)分别为0.624±0.014、0.330±0.014、0.262±0.019、0.246±0.017,F=65.46,P<0.01,能显著促进肿瘤组织中TNF-α、IFN—γ表达(F值分别为47.84、37.23,P值均<0.01)及延长荷瘤小鼠生存期(x2=18.45,P<0.01)。 结论 小鼠肝癌DC融合瘤苗能有效地诱导抗肿瘤免疫反应,在预防和治疗肝癌的复发及转移中有广阔的应用前景。

Antitumor effect of immunizations with fusions of dendritic and hepatocellular carcinoma cells in mice

OBJECTIVE: To investigate the effects of immunization with fusions of dendritic cells and H22 cells on tumor-bearing mice and their possible mechanisms. METHODS: Fusion cells of DC and H22 cells were prepared with polyethylene glycol (PEG). Expression of MHC and costimulatory molecules by dendritomas were determined by FACs. To study the antitumor immune preventative and therapeutic effects, fusions were subcutaneously injected into tumor-bearing mice. The cytotoxic T lymphocyte (CTL) activity was determined by LDH method, the expression of TNF-a and IFN-g in tumors were assayed by RT-PCR. RESULTS: The data showed that the hybridomas of DC and H22 cells acquired both DC and H22 cell phenotypes. Immunization of BALB/C mice with DC/H22 fusions induced potent CTL activity (mean CTL activity=0.624+/-0.024, compared with DC + H22, DC, H22 groups, F = 65.46) and a protective immunity against a high dose of H22 tumor challenge. After treatment with hybridomas, the survival time of tumor-bearing mice was greatly extended (x2=18.45). The expression levels of TNF-a and IFN-g mRNA were remarkably increased (TNF-a, F = 47.84; IFN-g, F = 37.23). CONCLUSIONS: The hybridomas of DC and H22 cells could induce effective antitumor immune responses and may have a useful potential in prevention and management of the recurrences and metastases of HCC.