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缺氧诱导丝裂原因子在高氧诱导肺上皮和成纤维细胞凋亡中的作用及意义 被引量:1

Critical role of hypoxia-induced mitogenic factor in hyperoxia-induced apoptosis of lung type II epi- thelial cells and fibroblasts
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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)
关键词 肺泡上皮细胞 成纤维细胞 缺氧诱导丝裂原因子 基因表达 小干扰RNA Lung epithelial ceils Fibroblasts Hypoxia-induced mitogenic factor Gene ex- pression Small interfering RNA
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参考文献11

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