Thrombospondin 1 Acts As a Strong Promoter of Transforming Growth Factor Beta Effects Via Two Distinct Mechanisms in Hepatic Stellate Cells

Overview

Journal Gut

Specialty Gastroenterology

Date 2005 Apr 16

PMID 15831915

Citations 35

Authors

K Breitkopf

I Sawitza

J H Westhoff

L Wickert

S Dooley

A M Gressner

Affiliations

Soon will be listed here.

Abstract

Background And Aims: Thrombospondin 1 (TSP-1) is an important activator of latent transforming growth factor beta (TGF-beta) but little is known of the expression patterns and functions of TSP-1 in liver cells. We therefore analysed if and how TSP-1 acts on TGF-beta during fibrogenesis.

Methods And Results: Using reverse transcription-polymerase chain reaction, we demonstrated that hepatocytes from normal liver expressed no TSP-1 mRNA whereas Kupffer cells and sinusoidal endothelial cells did. TSP-1 mRNA and protein were detected in quiescent and activated cultured hepatic stellate cells (HSC) and TSP-1 expression was highly inducible by platelet derived growth factor BB (PDGF-BB) and, to a lesser extent, by tumour necrosis factor alpha in activated HSC. Furthermore, addition of PDGF-BB directly led to enhanced TGF-beta mRNA expression and a TSP-1 dependent increase in TGF-beta/Smad signalling. Using either a peptide specifically blocking the interaction of TSP-1 with latent TGF-beta or antibodies against TSP-1 not only abrogated activation of latent TGF-beta but also reduced the effects of the active dimer itself.

Conclusions: Our data suggest that TSP-1 expression is important for TGF-beta effects and that it is regulated by the profibrogenic mediator PDGF-BB in HSC. Furthermore, the presence of TSP-1 seems to be a prerequisite for effective signal transduction by active TGF-beta not only in rat HSC but also in other cell types such as human dermal fibroblasts.

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