摘要
目的探讨B7-H1阻断对未成熟树突状细胞(DCs)的免疫刺激活性的影响。方法以细胞因子GM-CSF和IL-4体外诱导人单核细胞来源的树突状细胞,流式细胞仪检测在诱导过程中B7-H1的表达,并以B7-H1单抗阻断处理,分别以流式细胞仪、MTT法、ELISA、ELISPOT法检测B7-H1阻断对DCs的成熟和内吞能力、刺激淋巴细胞增殖、IL-12的分泌、诱导淋巴细胞分化的影响。结果DCs在诱导过程中B7-H1表达逐渐增强,第7d时的阳性表达率为54.12%,以TNF-α诱导成熟后阳性表达率为83.64%;B7-H1阻断对DCs成熟和内吞能力无影响,但可使未成熟DCs刺激淋巴细胞增殖的能力和IL-12的分泌明显增强,并诱导淋巴细胞向分泌IFN-γ的Th1/Tc1的分化。结论B7-H1阻断可增强未成熟DCs的免疫刺激活性,利用B7-H1阻断的DCs瘤苗激发抗肿瘤免疫的方案值得进一步探讨。
AIM: To investigate the immune stimulation capacity of B7-H1 blockade on immature dendritic cells (DCs) in vitro. METHODS: The human monocyte-derived dendritic cells were induced in the presence of cytokine GM-CSF and IL-4. The expression of B7-H1 was detected by FCM. On blockade of B7-H1, the maturation and endocytic activity, T cells stimulatory proliferation capacity, IL-12 production, T cell differentiation effect of DCs were detected by FCM, MTT assay, ELISA and ELISPOT, respectively. RESULTS: The expression of B7-H1 was increased with the induction of DCs. On day 7, the positive expression was 54.12%, and the TNF-α induced mature DCs had the positive expression rate of 83.64%. The blockade of B7-H1 on immature DCs had sharply increased their T cells stimulatory proliferation capacity and IL-12 production, and efficiently induced the development of Th1/Tc1 cells, but had no effect on their maturation and endocytic activity. CONCLUSION: The blockade of B7-H1 on immature DCs increases its immune stimulation activity. It is valuable to investigate the antitumor immune responses of DCs vaccine with B7-H1 blockade.
出处
《中国病理生理杂志》
CAS
CSCD
北大核心
2005年第5期906-910,共5页
Chinese Journal of Pathophysiology
基金
广州市科技攻关重点项目(No.2003Z2-E4011)
广东省自然科学基金资助项目(No.4009408)
