慢性缺氧对大鼠肺内细胞增殖、凋亡及相关基因表达的影响

目的：探讨慢性缺氧性肺动脉高压肺血管结构改建（ｐｕｌｍｏｎａｒｙｖａｓｃｕｌａｒｓｔｒｕｃｔｕｒａｌｒｅｍｏｄｅｌｉｎｇ，ＰＶＳＲ）的细胞及分子机制。方法：大鼠慢性缺氧模型复制，免疫组化及Ｎｏｒｔｈｅｒｎ杂交检测大鼠肺内ｃ－ｍｙｃ及ｂｃｌ－２两基因蛋白及ｍＲＮＡ的表达，免疫组化及原位缺口末端标记法检测大鼠肺内增殖相关抗原Ｋｉ－６７及凋亡细胞。结果：正常及慢性缺氧大鼠肺内均检出一定比率的增殖或凋亡细胞，缺氧１、２周大鼠肺内细胞增殖／凋亡比值比对照组分别增高约３、３５倍。与细胞增殖、凋亡密切相关的ｃ－ｍｙｃ、ｂｃｌ－２基因表达在缺氧１周大鼠肺内显著增高，在缺氧２周更显著。结论：细胞增殖、凋亡机制共同参与了慢性缺氧性肺动脉高压时ＰＶＳＲ的调节。

Effects of chronic hypoxia on cell proliferation, apoptosis and expression of c-myc and bcl-2 in lungs of rats

AIM:To study the cellular and molecular mechenism of pulmonary vascular structural remodeling (PVSR) in hypoxic pulmonary hypertension. METHOD:In situ terminal labeling for detection of apoptotic cells, Northern blot and immunohistochemical technique for detection of c- myc , bcl -2 expression. RESULTS:Compared with control, the ratio of cellular proliferation to apoptosis in lungs of rats exposed to chronic hypoxia is increased significantly, and so is expression of c- myc and bcl -2. CONCLUSION:Cellular proliferation and apoptosis that are regulated by c- myc and bcl -2 contribute to the regulation of PVSR.