RGD Reference Report - Tissue inhibitor of metalloproteinase-1 messenger RNA expression is enhanced relative to interstitial collagenase messenger RNA in experimental liver injury and fibrosis. - Rat Genome Database

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Tissue inhibitor of metalloproteinase-1 messenger RNA expression is enhanced relative to interstitial collagenase messenger RNA in experimental liver injury and fibrosis.

Authors: Iredale, JP  Benyon, RC  Arthur, MJ  Ferris, WF  Alcolado, R  Winwood, PJ  Clark, N  Murphy, G 
Citation: Iredale JP, etal., Hepatology. 1996 Jul;24(1):176-84.
RGD ID: 2290364
Pubmed: PMID:8707259   (View Abstract at PubMed)
DOI: DOI:10.1002/hep.510240129   (Journal Full-text)

Liver fibrosis results from a relative imbalance between synthesis and degradation of matrix proteins. We have previously described release of the protein collagenase inhibitor, tissue inhibitor of metalloproteinase-1 (TIMP-1), by culture-activated human hepatic stellate cells (HSCs). In this study, we have investigated the relative expression of TIMP-1 and interstitial collagenase in culture-activated rat HSCs and rat models of liver injury and fibrosis. The complementary DNA (cDNA) for rat TIMP-1 was obtained by homology polymerase chain reaction (PCR) and sequenced. By Northern analysis using this probe, TIMP-1 messenger RNA (mRNA) expression was up-regulated with HSC activation by culture on plastic as defined by cellular expression of procollagen-1. Interstitial collagenase mRNA was expressed in early 1. Interstitial collagenase mRNA was expressed in early culture (<4 days) but became undetectable in more activated cells (7-21 days). By activity assay of serum-free cell-conditioned media, TIMP-1 was found to be released in increasingly concentrations with duration of culture on plastic. Expression of TIMP-1 interstitial collagenase, and procollagen-1 mRNAs were studied in rat models of biliary and parenchymal injury (bile duct ligation and CC14 administration) by ribonuclease protein assay. TIMP-1 mRNA expression was increased at 6, 24 hours, and 3 days after bile duct ligation and was also shown to rise in acute CC14 liver injury and remain elevated as the liver became fibrotic. TIMP-1 expression preceded procollagen-1 expression in both models. In contrasts, interstitial collagenase mRNA levels remained similar to control values throughout both models of liver injury. Total cellular RNA from hepatocytes, HSCs, and kupffer cells freshly isolated from livers after acute CC14 injury was subjected to Northern analysis. TIMP-1 transcripts were observed in nonparenchymal cells only. We suggest that increased expression of TIMP-1 relative to interstitial collagenase by HSCs may promote progression of liver fibrosis in these rat models by preventing degradation of secreted collagens.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
cholestasis  ISOTimp1 (Rattus norvegicus)2290364; 2290364 RGD 
cholestasis  IEP 2290364 RGD 
Experimental Liver Cirrhosis  ISOTimp1 (Rattus norvegicus)2290364; 2290364mRNA:increased expression:liverRGD 
Experimental Liver Cirrhosis  IEP 2290364mRNA:increased expression:liverRGD 

Objects Annotated

Genes (Rattus norvegicus)
Timp1  (TIMP metallopeptidase inhibitor 1)

Genes (Mus musculus)
Timp1  (tissue inhibitor of metalloproteinase 1)

Genes (Homo sapiens)
TIMP1  (TIMP metallopeptidase inhibitor 1)


Additional Information