(Latent) transforming growth factor beta in liver parenchymal cells, its injury-dependent release, and paracrine effects on rat hepatic stellate cells

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
S RothAxel M Gressner

Abstract

Cultured parenchymal liver cells (PC) were recently recognized to contain (latent) transforming growth factor beta (TGF-beta) while the expression of TGF-beta mRNA remains controversial. This study was designed to analyze PC in different microenvironments (liver in situ, highly purified, isolated, and cultured PC) regarding the qualitative and quantitative content of mature and latent TGF-beta protein (immunostainings, enzyme-linked immunosorbent assay [ELISA], and enzyme-labeled fluorescence [ELF] technique). The results were compared with its gene expression (reverse-transcription polymerase chain reaction [RT-PCR]). In all microenvironments, PC contained latent TGF-beta, which was partially activated after cell isolation and culture. The amount of total TGF-beta (mature plus latent) of latency-associated peptide (LAP) and of latent TGF-beta binding protein (LTBP) were shown to decrease during culture. In contrast, TGF-beta2 and TGF-beta3 mRNA and LTBP-1 and -3 mRNA expression were first detectable after culture. Permeabilization of cell membranes in whole liver and of isolated PC with streptolysin O or carbon tetrachloride, respectively, released TGF-beta, a part of which was integrated in the large latent complex as estimat...Continue Reading

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