Low oxygen tension stimulates collagen synthesis and COL1A1 transcription through the action of TGF-beta1.

Abstract:

:Recent findings point to low oxygen tension (hypoxia) as an important mechanism for the expression of several eukaryotic genes. We have previously shown that hypoxia (2% O2), when compared to standard oxygen tension (20% O2), upregulates the mRNA levels of the human alpha1(I) (COL1A1) procollagen gene and transforming growth factor-beta1 (TGF-beta1) in human dermal fibroblasts. In this report, we determined the effect of hypoxia on collagen synthesis and transcription. Exposure of human dermal fibroblasts to hypoxia for 24-72 h led to a threefold, dose-dependent increase in collagenous protein (P < 0.0001; r = 0.9794) and to enhanced type I procollagen deposition, as shown by direct immunofluorescence. Transient transfections with a series of luciferase- and CAT-promoter constructs of the human COL1A1 gene (spanning from -2.5 kb to +113 bp) showed that hypoxia increases the transcriptional activity of constructs having 5' endpoints between -804 bp and -107 bp, with loss of stimulation at -84 bp. Maximal increase in promoter activity in hypoxia was observed between -190 and -174 bp of the proximal promoter, once a cKrox repressor site (-199 to -224 bp) was deleted. Upregulation of COL1A1 mRNA levels in hypoxia was blocked by a TGF-beta1 anti-sense oligonucleotide, and failed to occur in fibroblasts from TGF-beta1 knock-out mice. Co-transfection and overexpression with a Smad7 construct abrogated the increase in COL1A1 promoter activity observed in hypoxia. Upregulated transcriptional activity of the TGF-beta1 promoter in hypoxia was found to be maximal between -453 and -175 bp from the transcriptional start site. Since hypoxia is a critical feature of the early phases of wound repair, we conclude that it may act as a potent physiologic stimulus for collagen synthesis. TGF-beta1 appears to be a critical component of this response.

journal_name

J Cell Physiol

authors

Falanga V,Zhou L,Yufit T

doi

10.1002/jcp.10065

keywords:

subject

Has Abstract

pub_date

2002-04-01 00:00:00

pages

42-50

issue

1

eissn

0021-9541

issn

1097-4652

pii

10.1002/jcp.10065

journal_volume

191

pub_type

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