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Objective: To study the vaccine potency of gene-modified tumor cells. Methods: The EL-4 lymphoma was transduced with recombinant retrovirus containing the murine GM-CSF gene or B7-1 gene. The effect of gene transduction on antitumor immunity was investigated. Results: Flow cytometry analysis showed that expression of their surface marker between wild-type EL-4 cells and gene transduced tumor cells was the same except for CD80 positive in B7-1 gene transduced cells. GM-CSF gene or B7-1 gene transduced EL-4 cells resulted in remarkable loss of tumorigenicity in syngenetic mice. The systemic protective immunity was induced against the challenge with EL-4/wt cells. Therapeutic vaccine with EL-4/GM-CSF or EL/7-1 cells could retard the growth of established early-stage EL-4/wt tumor significantly, but not retard the growth of late-stage EL-4/wt tumor. Irradiated GM-CSF gene transduced EL-4 cells showed strong vaccine effect against EL-4 cell challenge, but irradiated B7-1 gene transduced EL-4 cells showed weak vaccine effect. Remarkable cooperative antitumor effect against EL-4 cell challenge was observed when both irradiated EL-4/GM-CSF and EL-4/B7-1 were inoculated together. Conclusion: GM-CSF gene or B7-1 gene transduced combination of the two kinds of vaccine may have potential application value in human cancer treatment.
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CD4+T细胞与血吸虫感染的保护性免疫
血吸虫病仍是一个严重的世界性公共卫生问题,据WHO近估计,全世界仍有6亿人口处于感染血吸虫的危险环境中,其中约2亿人受感染,每年死于血吸虫病者超过10万人,造成巨大的社会经济损失.虽然全球范围内,血吸虫病防治已持续数十年,全面控制血吸虫病传播的前景仍不容乐观.血吸虫病疫苗的研制与发展已被置于防治研究的重要地位.近年来,许多研究均集中于抗血吸虫感染的获得性免疫应答机制和寻找可能诱导保护免疫的相关寄生虫抗原分子等基础研究.
