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重组EB病毒BHRF1蛋白对裸鼠脾细胞程序性死亡的抑制作用 |
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朱振宇 谢强 潘景轩 戴克胜 张清秀 马涧泉
摘 要 目的:观察适当浓度的EBV-BHRF 1重组蛋白(rBHRF1)抽提液有无拮抗裸鼠脾细胞程序性死亡(PCD)作用。方法:用1×10-6mol/L地塞米松作用18 h、43℃加热10 min及无血清培养48 h等方法诱导脾细胞发生PCD,预先加入终浓度为2mg/L的rBHRF1蛋白起拮抗作用。结果:未加rBHRF1的对照组细胞发生典型的PCD,即细胞DNA的电泳出现PCD特征性的梯形(ladder)DNA降解片段;电镜观察显示核凝缩,但细胞膜及细胞器结构基本保持正常。若与适当浓度的rBHRF1预培养8 h,再用上述方法处理,则因有重组蛋白的保护而未出现DNA降解片段及PCD的形态学变化。结论:初步显示rBHRF1具有抑制脾细胞发生PCD的功能。 主题词 细胞死亡;地塞米松;小鼠,裸;爱波斯坦-巴尔病毒
Apoptosis in nude mice spleen cells was inhibited by recombinant EBV-BHRF1 protein
ZHU Zhen-Yu, XIE Qiang, PAN Jing-Xuan, DAI Ke-Sheng, ZHANG Qing-Xiu,MA Jian-Quan Department of Biochemistry, Sun Yat-sen University of Medical Sciences, Guangzhou (510089)
Abstract AIM:To observe if recombinant EBV-BHRF1 protein(rBHRF1) could inhibit the programmed cell death (PCD) of nude mice spleen cells. METHODS: PCD models of nude mice spleen cells were set up by induction under 3 factors, i.e.①cultured with 1×10-6mol/L dexmethasone for 24 h, ②43℃ for 10 min and ③in the absence of fetal calf serum for 48 h. And 2mg/L(terminal concentration) rBHRF1 was added 8h before the 3 kind of PCD induction factors. RESULTS: Agarose gel electrophoresis of DNA extracted from the model cells showed the typical oligonucleosomal pattern of PCD. The cell s chromatin condensed, but cell membrane and mitochondrial were preserved under electron microscopy. PCD of nude mice spleen cells could be inhibited when the cells were cultured with a proper concentration of rBHRF1 for 8 h previously. CONCLUSION: rBHRF1 could suppress the PCD induced by these 3 factors. MeSH Cell death; Dexamethasone; Mice, nude; Epstein-Barr virus
程序性细胞死亡(programmed cell death, PCD),又称凋亡(apoptosis),是目前非常活跃的研究领域之一[1]。Bcl-2基因产物能拮抗多种因素引起的PCD[2]。EB病毒(Epstein-Barr virus, EBV)与人类的多种疾病密切相关,如以珠江流域为高发中心的鼻咽癌(nasopharyngeal carcinoma, NPC)、伯基特淋巴瘤及传染性单核细胞增多症等。EBV的BHRF1基因产物与Bcl-2有38%同源性,在细胞内的定位也相似[3],但其重组的原核表达产物是否具有抑制多种诱导因素所引起的免疫细胞PCD作用尚未见报道。本室根据EBV全[1] [2] 下一页 上一个医学论文: 肺表面活性物质对大鼠肺损伤后氧合功能的影响 下一个医学论文: 去甲肾上腺素诱发的家兔肠系膜微血管运动及尼卡地平对其影响
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