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负载小鼠bEnd.3细胞抗原的树突状细胞诱导小鼠抗同种子宫颈癌U14细胞的免疫反应

Study on the specific immunity induced by dendritic cell vaccine loading allogenic microvascular endothelial cell bEnd. 3 antigen against U14 cervical cancer cell in mice

摘要:

目的 探讨负载小鼠脑微血管内皮细胞bEnd.3抗原的树突状细胞(DC)诱导小鼠抗同种宫颈癌U14细胞的体液和细胞免疫反应.方法 培养小鼠脑微血管内皮细胞bEnd.3,逆转录(RT)-PCR技术检测血管内皮细胞增殖相关抗原血管内皮生长因子受体2(VEGF-R2)和整合素αV的表达,并制备bEnd.3细胞的冻融抗原,用抗原负载DC(即bEnd.3-DC).采用bEnd.3-DC免疫小鼠(bEnd.3-DC组),共4次,每周1次,设DC组和磷酸盐缓冲液(PBS)组作为对照;免疫结束后1周皮下注射小鼠宫颈癌U14细胞,观察荷瘤小鼠的肿瘤生长情况,检测免疫后小鼠脾T淋巴细胞体外靶向血管内皮细胞的细胞毒T淋巴细胞(CTL)效应、脾CD+3 CD+8T淋巴细胞百分率和免疫后小鼠血清的抗体滴度,通过免疫细胞化学方法和蛋白印迹法进行小鼠抗血清的特异性免疫反应分析.结果 经RT-PCR技术证实,bEnd.3细胞在mRNA水平表达VEGF-R2和整合素αV.PBS组小鼠的肿瘤生长最快,DC组和bEnd.3-DC组小鼠肿瘤也有生长,但生长较慢;在免疫小鼠2周后,bEnd.3-DC组小鼠肿瘤消失,PBS组小鼠肿瘤体积为(3.38 ±0.34)cm3,DC组小鼠肿瘤体积为(0.11±0.13)cm3.小鼠脾T淋巴细胞体外CTL实验结果显示,bEnd.3-DC组有明显的特异性靶向杀伤bEnd.3细胞的作用,其杀伤率超过60%.脾CD+3 CD+8 T淋巴细胞的百分率,PBS组为(30.0±0.9)%,DC组为(32.8±0.4)%,bEnd.3-DC组为(38.6 ±0.7)%,3组间比较,差异有统计学意义(P<0.05).bEnd.3-DC组免疫小鼠血清的抗体滴度为1∶3200,DC组为1∶800,PBS组则为0.免疫细胞化学检测显示,bEnd.3-DC组的抗血清与bEnd.3细胞有特异性的抗原抗体反应;蛋白印迹法结果显示,在相对分子质量为220 000处有特异性的VEGF-R2蛋白条带.结论 负载小鼠bEnd.3细胞抗原的DC对小鼠宫颈癌Ui4细胞的生长有抑制作用,其原因是诱导小鼠产生了特异性的靶向血管内皮细胞的CTL和针对bEnd.3细胞中的某些血管内皮细胞增殖相关抗原的细胞和体液免疫应答.

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abstracts:

Objective To explore the specific cellular and humoral immunity induced by dendritic cells (DC) vaccine loading allogenic microvascular endothelial cell bEnd. 3 antigen against U14 cervical cancer cell of mice. Methods Mouse brain microvascular endothelial cell bEnd. 3 was cultured and identified for preparation endothelial cell bEnd. 3 antigen. The level of mRNA expression of vascular endothelial growth factor receptor 2 (VEGF-R2) and integrin αV was detected by reverse transcription (RT)-PCR. The BALB/c mice were immuned with DC loading bEnd. 3 antigen 4 times in 4 weeks (bEnd. 3-DC group), while the mice only were immuned with DC or injected with phosphate buffer saline (PBS group) as control group. One week after last vaccination, U14 cervical cancer cells were injected subcutaneously into the mice. The tumor size, cytotoxic T lymphocyte (CTL) response of spleen lymphocytes in vitro, the percentage of CD3+ CD+8 surface markers of spleen lymphocytes, and the titer of serum antibody were detected. The specific immunity was examined by immunocytochemistry and western blot. Results The expression of VEGF-R2 and integrin αV gene in bEnd. 3 cells were expressed highly.After the vaccine was injected, the tumors of mice in PBS group grew faster than those in other groups, while the tumors in bEnd. 3-DC group grew slowly and disappeared after 2 weeks. The volume of tumors in DC group grew slower than those in PBS group [(0.11± 0.13) cm3 versus (3.38 ±0.34) cm3]. The CTL response of spleen iymphocytes in vitro showed that bEnd. 3-DC cells could kill bEnd. 3 cells, the special lysis rate was more than 60% . The percentage of CD+3 CD+8 spleen lymphocytes in bEnd. 3-DC group[(38.6 ± 0.7) %] was higher than those in other groups (P < 0.05). The titer of serum antibody of Immunocytochemistry analysis indicated there were specific antigen-antibody reaction to bEnd. 3 cell in bEnd. 3-DC group. Western blot analysis revealed that there were specific bands at 220 000 (VEGF-R2).Conclusions bEnd. 3-DC vaccine can inhibit the tumor growth of U14 cervical cancer cell of mice, which indicates that the special cellular and humorai immunity are induced by bEnd. 3-DC antigen which maybe have some antigens in bEnd. 3 cells that reacts with endothelial cell proliferation-related antigens.

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