Hypoxia Down-regulates Secretion of MMP-2, MMP-9 in Porcine Pulmonary Artery Endothelial and Smooth Muscle Cells and the Role of HIF-1
- Author:
Hong YE
1
;
Yanfang ZHENG
;
Wanli MA
;
Dan KE
;
Xianrong JIN
;
Shengyuan LIU
;
Dixun WANG
Author Information
1. Huazhong University of Science and Technology
- Keywords:
hypoxia;
pulmonary artery;
endothelial cells;
smooth muscle cells;
MMPs;
HIF-1
- From:
Journal of Huazhong University of Science and Technology (Medical Sciences)
2005;25(4):382-384,407
- CountryChina
- Language:Chinese
-
Abstract:
Primary cell culture, techniques of gene transfection, gelatin zymography, and Western blot were used to investigate the effect of hypoxia on the secretion of MMP-2 and MMP-9 in pulmonary artery endothelial cells (PAEC) and smooth muscle cells (PASMC), and the role of HIF-1. Our results showed that (1) after exposure to hypoxia for 24 h, the protein content and activity of MMP-2 in the PAEC medium as well as these of MMP-2 and MMP-9 in PASMC medium (P<0.01) decreased significantly in contrast to those in normoxic group (P<0.05); (2) after transfection of wild type EPO3'-enhancer, a HIF-1 decoy, the content and activity of MMP-2 and MMP-9 in hypoxic mediums became higher than those in normoxic group (P<0.01), while transfection of mutant EPO3'-enhancer didn't affect the hypoxia-induced down-regulation. It is concluded that hypoxia could inhibit the secretion and activity of MMP-2 and MMP-9 in PAEC and PASMC, which could be mitigated by the transfection of EPO3'-enhancer and that HIF-1 pathway might contribute to hypoxia-induced down-regulation of MMP-2 and MMP-9.
