摘要
目的探讨缺氧诱导丝裂原因子(HIMF)在高氧诱导肺上皮和成纤维细胞凋亡中的作用及其意义。方法肺泡Ⅱ型上皮MLE-12细胞和成纤维NIH/3T3细胞分别转染靶向HIMF的小干扰RNA后,置于正常氧(21%O2)、高氧(85%O2)条件下培养3—18h,采用实时定量聚合酶链反应(Real.timePCR)法检测细胞中HIMFmRNA水平,运用吖啶橙-溴化乙锭染色法、Hochest33258染色法及膜联蛋白V(AnnexinV)-碘化丙锭(PI)双染流式细胞术检测细胞凋亡变化。结果与对照组比较,高氧暴露3、6、9、18h后,MLE-12和NIH/3T3细胞中HIMFmRNA水平分别增高2.783—5.023倍(P〈0.05)、2.864~15.162倍(P〈0.05),细胞凋亡率增高1.5~2.3倍(P〈0.05)、1.1~2.1倍(P〈0.05);沉默HIMF基因后,高氧诱导的MLE.12和NIH/3T3细胞凋亡率分别进一步升高1.5~2.5倍(P〈0.05)、1.3—2.0倍(P〈0.05)。结论HIMF基因可能通过对抗高氧诱导的肺泡Ⅱ型上皮细胞和成纤维细胞凋亡,参与高氧肺损伤的发病机制。
Objective To study the role of hypoxia-indueed mitogenic factor (HIMF) in hyperoxi- a-induced apoptosis of lung typeII epithelial cells and fibroblasts. Methods Lung epithelial type II MLE-12 cells and fibroblast NIH/3T3 cells were transfected with small interference RNA (siRNA) targe- ting HIMF, and exposed to normoxia (21% O2) and hyperoxia (85% O2) for 3, 6, 9 and 18 h. The HIMF expression was detected by using real-time quantitative polymerase chain reaction (Real-time PCR). Cell apoptosis was examined by using AO-EB staining, Hoehest 33258 staining, and Annexin V-PI staining flow cytometry. Results As compared witho those of normoxia-exposed cells, the HIMF mRNA levels in hyperoxia-exposed MLE-12 and NIH/3T3 cells were enhanced by 2. 783-5. 023 times ( P 〈 0. 05 ) and 2. 864-15. 162 times (P 〈0. 05) at 3, 6, 9, and 18 h, with increased apoptosis ratio by 1.5-2. 3 times ( P 〈 0.05 ) and 1.1-2. 1 times ( P 〈 0. 05 ), respectively. Knockdown of HIMF increased the hyperoxia- induced apoptosis of MLE-12 and NIH/3T3 cells by 1.5-2. 5 times ( P 〈 0. 05 ) and 1.3-2.0 times ( P 〈 0. 05). Conclusion HIMF can protect the lung type 11 epithelial cells and fibroblasts from hyperoxia-in- duced apoptosis, which may participate in the etiology of hyperoxia-indueed lung injury.
出处
《中华实验外科杂志》
CAS
CSCD
北大核心
2013年第8期1612-1614,共3页
Chinese Journal of Experimental Surgery
基金
国家自然科学基金资助项目(30200284、30600278、30772359、81071997、81072073)
教育部“新世纪优秀人才支持计划”资助项目(NCET-06-0641)
教育部回国人员基金资助项目(2008889)