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Effect of hydrogen sulfide, a new gaseous signal molecule, on pulmonary vascular smooth muscle cell apoptosis in rats
Author(s): 
Pages: 341-344
Year: Issue:  4
Journal: JOURNAL OF PEKING UNIVERSITY(HEALTH SCIENCES)

Keyword:  硫化氢低氧高血压肺性细胞凋亡;
Abstract: 目的:探讨新型气体信号分子硫化氢(H2S)对低氧大鼠肺动脉平滑肌细胞凋亡的调节作用.方法:24只Wistar大鼠,随机分为对照组(8只)、低氧组(8只)和低氧+NaHS组(8只).以化学分光光度法测定血浆H2S含量;采用原位缺口末端标记方法(TUNEL)检测大鼠肺动脉平滑肌细胞的凋亡,并行图像分析计算单位面积细胞凋亡率;采用免疫组织化学方法检测肺动脉平滑肌细胞凋亡蛋白Bcl-2、Fas和caspase-3表达,并进行定位和半定量分析.结果:低氧组与对照组比较,低氧组大鼠血浆中H2S含量下降36%,应用TUNEL检测肺动脉平滑肌细胞单位面积凋亡率减少52.9%,肺动脉平滑肌细胞Bcl-2蛋白表达增高123.9%,Fas蛋白表达减弱45%,caspase-3表达与对照组差异无显著性;低氧组与低氧+NaHS组比较,低氧+NaHS组大鼠血浆中H2S含量升高65%,应用TUNEL检测到肺动脉平滑肌细胞单位面积凋亡率较低氧组增高62.5%,肺动脉平滑肌细胞Bcl-2蛋白表达减弱36.4%,Fas和caspase-3蛋白表达分别增高84.8%、34.5%;结论:低氧时肺动脉平滑肌细胞凋亡减少,H2S可能通过抑制肺动脉平滑肌细胞Bcl-2蛋白表达、增加Fas和caspase-3蛋白表达,促进低氧时肺动脉平滑肌细胞凋亡.
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