Linked Life Data

9328313

Source:http://linkedlifedata.com/resource/pubmed/id/9328313

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1997-10-23
pubmed:abstractText
Liver stellate cells (SCs) play central roles in both the storage of retinol and the development of liver fibrosis. The present study is aimed to understand the mechanism by which retinoic acid (RA, an active metabolite of retinol) enhances hepatic fibrosis in rats. We tested the effect of 9-cis-RA on several aspects in vitro rat SC cultures, including the activity of cellular plasminogen activator (PA), messenger RNA (mRNA), and protein levels of transforming growth factor-beta (TGF-beta) mRNA level of type-I procollagen, and the activity of type-I collagenase. Employing the rat liver fibrosis model produced by porcine serum, we also estimated the effect of oral administration of a stable RA analog on the progression of the fibrosis, as well as on hepatic TGF-beta contents. In vitro SC cultures, 9-cis-RA enhanced cellular PA and plasmin levels thereby induced plasmin-mediated activation of latent TGF-beta. Active TGF-beta generated self-stimulated its synthesis as well as that of collagen and suppressed the production of collagenase in an autocrine manner. In in vivo rat models, an RA analog accelerated the porcine serum-induced fibrosis by enhancing TGF-beta contents and, thus, collagen levels in the liver, although the RA analog alone was not fibrogenic. These results suggest that RA exacerbated liver fibrosis, at least in part, by inducing the activation and production of latent TGF-beta in liver SCs.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0270-9139
pubmed:author
pubmed:issnType
Print
pubmed:volume
26
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
913-21
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1997
pubmed:articleTitle
Retinoids exacerbate rat liver fibrosis by inducing the activation of latent TGF-beta in liver stellate cells.
pubmed:affiliation
First Department of the Internal Medicine, Gifu University School of Medicine, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't