Hypoxia induces alteration of bone morphogenetic protein receptor signaling in pulmonary artery endothelial cell.

Abstract:

:Reduced expression of bone morphogenetic protein receptors (BMPR) has been implicated in the pathogenesis of pulmonary hypertension (PH), but changes in the intracellular signaling pathway of BMPR have not been fully understood. We hypothesized that BMPR signaling in pulmonary endothelial cells is altered during the development of PH, such as hypoxia-induced PH. We examined the expression of BMPR, BMP-regulated Smads and Id-1 in lung tissues of Sprague-Dawley rats exposed to 2 wk of hypoxia and in isolated lung vascular endothelial cells exposed to hypoxia. BMPRII was predominantly expressed in the endothelial cells (EC) of pulmonary vasculature. In hypoxic rats, reduced expression of BMPRII was observed in the EC of resistance pulmonary arteries. The expression of phosphorylated-Smad1/5/8 and Id-1 in EC was also reduced, whereas the expression of Smad1 as well as activin receptor-like kinase 1 (ALK1) was up-regulated during the development of PH. In in vitro exposure to hypoxia, the expression of mRNA transcripts for BMPRII, Smad8, and Id-1 in EC was reduced, whereas mRNA of Smad1 was not diminished. Our results suggest that hypoxia induces alteration of intracellular BMPR signaling in the EC of resistance pulmonary artery, which is involved in the pathogenesis of PH.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Takahashi K,Kogaki S,Matsushita T,Nasuno S,Kurotobi S,Ozono K

doi

10.1203/pdr.0b013e3180332cba

subject

Has Abstract

pub_date

2007-04-01 00:00:00

pages

392-7

issue

4

eissn

0031-3998

issn

1530-0447

journal_volume

61

pub_type

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