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Objective: To investigate the in-vitro antitumor immune responses of dendritoma formed by mouse hepatocellular carcinoma (HCC) cells and lymphotactin (Lptn) gene modified dendritic cells (DCs). Method: DCs prepared from mouse bone marrow were genetically modified by lymphotactin adenovirus, and fused with H22 cells by polyethylene glycol (PEG). RT-PCR and ELISA were employed to identify lymphotactin expression at mRNA and protein level. Cell phenotypes and fusion efficiency was detected by FACS. The stimulatory effect of DC on T cells was detected by mixed lymphocyte reaction. The cytotoxicity activity against H22 cells was assayed by LDH method. Results: Lymphotactin could be efficiently expressed by DCLptn/H22 hybridoma. DCLptn/H22 cells could induce potent T cell proliferation effect and generate strong cytotoxic T lymphocyte (CTL) reaction against allogenic H22 cells. Conclusion: Lymphotactin genetic modification could enhance the in vitro immune activity of the dendritoma. 相似文献
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生物界中,植物比动物更容易受到大气污染的影响和危害。这是因为植物既有庞大的叶面积与空气接触并进行着活跃的气体交换;又不能像高等动物那样具有优异的循环系统,可有效缓解外界影响,为其细胞和组织提供较为稳定的内环境;此外,植物的分布一般又是固定不动的,不像... 相似文献
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“巨足”巴塔哥尼亚●杨振林逄效栋/山东安丘实验中学巴塔哥尼亚高原是阿根廷和南美洲的重要地区。西班牙语中,“巴塔哥尼亚”是“巨足”的意思。1519年,随麦哲伦环球旅行到达今天里瓦达维亚海军准将城附近的意大利学者安东尼奥·皮加费塔,看到当地土著居民——巴... 相似文献
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我国大部分地区地处中纬,常有来自南北两方的不同性质气团交绥,锋面活动颇繁。冬季,我国盛行极地大陆气团和热带高空气团,极地大陆气团随着位置南移而剧烈变性,因此,典型的极地大陆气团与变性的极地大陆气团之间以及各种变性极地大陆气团之间,都存在着旺盛的锋面活动;夏季,影响我国的气团很多,有热带海洋气团、赤道海洋气团、极地海洋气团等,故锋面类型也不少;秋季则由于西伯利亚高压势力迅速增强,极地大陆气团往往快速南下, 相似文献