Role of hypoxia- inducible factor-1 in cardioprotection of hypoxic preconditioning
- VernacularTitle:缺氧诱导因子-1在缺氧预处理心肌保护中的作用及其机制研究
- Author:
Xiuhua LIU
;
Xudong WU
;
Lirong CAI
;
Fengying LIU
- Publication Type:Journal Article
- Keywords:
Hypoxic preconditioning;
Myocardium;
Hypoxia-inducible factor-1
- From:
Chinese Journal of Pathophysiology
1986;0(03):-
- CountryChina
- Language:Chinese
-
Abstract:
AIM: To investigate the effects of hypoxia-inducible factor-1 (HIF-1) on cardioprotection of hypoxic preconditioning (HPC) and its mechanisms. METHODS: In the model of hypoxia/reoxygenation (H/R) of cardiomyocytes from neonatal Spargue-Dawley rats, delayed cardioprotective effects of HPC on lethal H/R were observed. Whole cell extracts were prepared for determining activities of extracellular signal-regulated protein kinases (ERKs) and HIF-1? phosphorylation. RESULTS: HPC significantly promoted survival and membrane integrity of cardiomyocytes subjected to sustained H/R. SDS-PAGE mobility shift experiments showed increased phophorylation level of HIF-1? in hypoxic preconditioned cardiomyocytes. ERK1/2 were activated at 10 min after HPC and returned to the control level at 60 min. CONCLUSION: HPC protects neonatal cardiomyocytes from H/B injury. HIF-1? phosphorylation induced by ERKs might contribute to the cardioprotection of HPC.
