基金National Cancer Institute 5R01CA091792-085R01CA108461-05+2 种基金1R01CA137894-01 and 1R01CA138434-01A209National Institute of Allergy and Infectious Diseases 5R01AI067037-04National Institute of Dental and Craniofacial Research 5R01DE017338-03(to ESR)
基金National Cancer Institute 5R01CA091792-085R01CA108461-05+2 种基金1R01CA137894-01 and 1R01CA138434-01A209National Institute of Allergy and Infectious Diseases 5R01AI067037-04 National Institute of Dental and Craniofacial Research 5R01DE017338-03(to ESR)
文摘目的研究卡泼肉瘤病毒(Kaposis′s sarcoma-associated herpesvirus,KSHV)编码的复制转录激活因子(replication and transcription activator,RTA)调控宿主细胞Bcl-2表达的分子机制及其生物学意义。方法突变Bcl-2启动子第1个与第2个CCN9GG样序列,构建了新的报告质粒(命名为pGL3-△RRE1,2),用荧光素酶试验和染色质免疫共沉淀进一步验证CCN9GG样RTA反应元件的功能。构建RNA干扰慢病毒载体,筛选稳定感染的BC3细胞,佛波酯诱导48 h后,分别用PCR、PI(碘化吡啶)染色流式细胞术检测病毒子DNA和细胞凋亡率。结果突变第1个与第2个CCN9GG序列导致启动子活性显著降低;染色质免疫共沉淀试验证实RTA蛋白与CCN9GG序列存在直接相互作用。用RNA干扰技术抑制Bcl-2基因后,佛波酯诱导的KSHV阳性细胞与对照组细胞相比凋亡率增加,病毒子产生减少。结论 KSHV RTA能够调控内源性细胞凋亡信号通路,延缓溶解性感染宿主细胞的凋亡,并促进病毒子产生。
基金National Cancer Institute 5R01CA091792-085R01CA108461-05+2 种基金1R01CA137894-01 and 1R01CA138434-01A209National Institute of Allergy and Infectious Diseases 5R01AI067037-04National Institute of Dental and Craniofacial Research 5R01DE017338-03(to ESR)