Significance of hypoxia induced alveolar epithelial cell apoptosis and hypoxia inducible factor-1alpha expression
10.3760/cma.j.issn.1007-9408.2009.01.011
- VernacularTitle:缺氧对大鼠肺泡上皮细胞凋亡及缺氧诱导因子-1α表达的影响
- Author:
Juan HE
;
Hui Lü
;
Li TAO
- Publication Type:Journal Article
- Keywords:
Cobalt;
Anoxia;
Pulmonary alveoli;
Epithelial cells;
Apoptosis;
Hypoxiainduci ble factor 1,alpha subunit
- From:
Chinese Journal of Perinatal Medicine
2009;12(1):41-45
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effects of cobalt chloride(COCl2)induced rat alveolar epithelial cell apoptosis and the significance of related apoptosis protein hypoxia inducible factor-lalpha(HIF-1 a)expression. Methods Alveolar epithelial cells were cultured in vitro and divided into four groups with 6 samples in each.Hypoxia 4 h group:added 500μmol/L COCl2 for 4 hours inducing alveolar epithelial cell hypoxia;hypoxia 24 h group:co-cultured with COCl2 for 24 hours;hypoxia 48 h group:co-cultured with CoCl2 for 48 hours;control group:no CoCl2 added.The apoptosis rates were detected by fluorescent microscope and flow cytometry.The apoptosis morphological changes of the cell were observed by transmission electron microscopy.The protein expression of HIF-la was detected bv Western Blot. Results (1)Fluorescent microscope results showed that apoptosis rate in hypoxia 4 h、24 h、48 h group[(5.83±0.76)%,(15.00±3.28)%and(51.50±3.00)%],were higher than control group[(1.50±0.50)%](P＜0.05).(2)Flow cytometry analysis reached the same results as with fluorescent microscope.(3)Typical morphological changes of apoptosis were observed in hypoxia 24 h group.(4)HIF-1α expression in hypoxia 4 h、24 h and 48 h groups[0.69±0.035,1.02±0.044 and 0.71±0.046],were higher than control group(0.21±0.026)(P＜0.01).(5)Positive correlations were found between relative amount of HIF-1αprotein and apoptosis rate by fluorescent microscope and flow cytometry analysis(r=0.484,P=0.016;r=0.713,P=0.009).Conclusions Hypoxia could induce apoptosis of alveolar epithelial cells,which may participate in the pathogenesis of hypoxia-induced lung injury.
