首都医科大学学报 ›› 2009, Vol. 30 ›› Issue (2): 172-176.

• 肺循环疾病的基础研究 • 上一篇    下一篇

低氧通过Ca2+-NFAT信号通路促进肺动脉平滑肌细胞增生

李积凤1,2,3, 王丛1,2,3, 刘杰2,3, 王跃秀1,2,3, 王军2,3, 王辰1,3   

  1. 1. 首都医科大学附属北京朝阳医院呼吸内科,北京呼吸疾病研究所;2. 首都医科大学基础医学院生理学教研室;3. 首都医科大学呼吸病学系
  • 收稿日期:2009-01-12 修回日期:1900-01-01 出版日期:2009-04-21 发布日期:2009-04-21
  • 通讯作者: 王丛, 王军

Hypoxia Promotes Human Pulmonary Artery Smooth Muscle Cells Proliferation Through Ca2+-NFAT Pathway

LI Ji-feng1,2,3, WANG Cong1,2,3, LIU Jie2,3, WANG Yue-xiu1,2,3, WANG Jun2,3, WANG Chen1,3   

  1. 1. Department of Respiratory Disease, Beijing Chaoyang Hospital, Capital Medical University, Beijing Institute of Respiratory Medicine;2. Department of Physiology, Capital Medical University;3. Department of Respiratory Diseases, Capital Medical University
  • Received:2009-01-12 Revised:1900-01-01 Online:2009-04-21 Published:2009-04-21

摘要:

目的 通过观察低氧对肺动脉平滑肌细胞增生的影响及作用机制,探讨低氧在肺动脉高压发病过程中的作用,为肺动脉高压的进一步干预治疗提供可靠的理论依据。方法 培养人肺动脉平滑肌细胞(human pulmonary artery smooth muscle cell,HPASMCs)并分为以下几组:正常对照组、低氧组(24 h、48 h、72 h)、低氧并处理组(低氧48 h并在细胞外液中加入EDTA 2 mmol/L或VIVIT 4 μmol/L)。分别应用细胞计数法检测细胞的增生情况、荧光钙成像法测定细胞内游离钙离子浓度([Ca2+i)、激光共聚焦显微镜观察活化T细胞核因子c3(nuclear factor of activated T cells,NFATc3)在细胞核内外分布的变化。结果 低氧呈时间依赖性促进HPASMCs增生;低氧处理的细胞静息[Ca2+i和库容性钙内流(capacitative calcium entry,CCE)显著升高,NFATc3的核转位增多。 EDTA(Ca2+螯合剂)或VIVIT(NFAT特异性抑制剂)能够明显抑制低氧诱导的细胞增生现象。结论 低氧能促进HPASMCs的增生,其机制可能是通过增加静息[Ca2+i和库容性钙内流,使HPASMCs内的Ca2+异常升高并导致NFATc3转位至核内,进而促进与增生有关的基因的表达。

关键词: 低氧, 肺动脉平滑肌细胞, 肺动脉高压, 库容性钙内流, 活化T细胞核因子

Abstract:

Objective To investigate the possible signal transduction pathways involved in hypoxia-induced human pulmonary artery smooth muscle cell(HPASMCs) proliferation. Methods Cultured HPASMCs were divided into the following groups, the control group; the hypoxia group(cultured in 3% O2 for 24 h, 48 h and 72 h) and the treatment groups(hypoxia for 48 h and treated with 2 mmol/L EDTA or 4 μmol/L VIVIT). Cell number was determined with a hemocytometer. [Ca2+i was measured by calcium imaging. The translocation of NFATc3 in immunofluorescence-stained HPASMCs was detected by confocal microscopy. Results The cell number, [Ca2+i and NFATc3 translocation were significantly higher in hypoxia-treated groups. EDTA(a chelator of Ca2+) or VIVIT(the specific inhibitor of NFAT) significantly inhibits the hypoxia-induced proliferation of HPASMCs. Conclusion Ca2+-NFAT pathway maybe involved in hypoxia-induced HPASMCs proliferation.

Key words: hypoxia, pulmonary artery smooth muscle cells, pulmonary artery hypertension, capacitative calcium entry, nuclear factor of activated T cells

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