医学
缺氧(环境)
缺氧诱导因子
肺动脉高压
缺氧诱导因子1
内科学
心脏病学
癌症研究
病理
转录因子
基因
生物
氧气
生物化学
有机化学
化学
作者
Jie Yan,Yan Shen,Yan Wang,Bingbing Li
标识
DOI:10.1097/maj.0b013e31824cf5a2
摘要
Introduction The role of hypoxia-inducible factor-1α (HIF-1α) in pulmonary vascular remodeling is still undetermined. The objective of this study is to investigate the expression of HIF-1α and its role in proliferating neointimal lesions in a rat model of pulmonary arterial hypertension induced by monocrotaline (MCT) administration after left pneumonectomy. Methods The rats were subjected to MCT (60 mg/kg, subcutaneously) 7 days after left pneumonectomy or sham surgery; controls with vehicle treatment after left pneumonectomy or sham surgery were also studied. On day 35, hemodynamic parameters of the rats were measured. The right lower lobes of the lungs were fixed for morphometric analysis. The expression of proliferating cell nuclear antigen and survivin was detected with Western blot. The expressions of HIF-1α and hexokinase-2 (HK-2) were detected with Western blot and immunohistochemistry assay. Results The rats treated with MCT after pneumonectomy developed severe pulmonary arterial hypertension and marked medial thickening on day 35. The neointimal lesions in pulmonary arterioles were observed only in MCT-treated pneumonectomized rats. The severely injured pulmonary arterioles (intimal proliferation causing greater than 50% luminal occlusion) accounted for 40% of all the measured arterioles in rats treated by MCT after pneumonectomy. The intriguing finding showed that HIF-1α was predominantly expressed in neointimal lesion areas, paralleled with the increased expression of HK-2 in MCT-treated pneumonectomized rats, which was not observed in rats undergoing MCT treatment alone. Conclusions The activation of HIF-1α/HK-2 axis is probably the key mediator responsible for the neointimal lesion formation in MCT-treated pneumonectomized rats.
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