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. 1992 Nov 1;287(Pt 3):897–904. doi: 10.1042/bj2870897

Hepatic effects of endothelin. Receptor characterization and endothelin-induced signal transduction in hepatocytes.

C R Gandhi 1, R H Behal 1, S A Harvey 1, T A Nouchi 1, M S Olson 1
PMCID: PMC1133091  PMID: 1332687

Abstract

Endothelin, a potent vasoactive peptide originally isolated from the vascular endothelial cells, exerts glycogenolytic and vasoconstrictive actions in the perfused rat liver. In this paper we demonstrate high-affinity binding sites for endothelin-1 (ET-1) on rat hepatocytes. Upon incubation at 37 degrees C, association of ET-1 with hepatocytes occurred in a time-dependent manner, was maximal between 3 and 6 h, and subsequently declined; at this temperature ET-1 was rapidly internalized with the internalized ligand exceeding the surface-bound ligand at all time points. The rate of association of 125I-ET-1 with hepatocytes was much slower when the binding assay was performed at 4 degrees C; sequestration of ET-1 in hepatocytes was also substantially reduced at this temperature. ET-1 was extremely potent in stimulating phosphoinositide metabolism in hepatocytes, with significant activation of this signal transduction process occurring at ET-1 concentrations as low as 0.1 pM, with an EC50 of 1 pM. The effect of ET-1 was coupled via a pertussis toxin-sensitive G-protein. Cholera toxin did not affect ET-1-mediated phosphoinositide metabolism and neither toxin influenced the association of 125I-ET-1 with hepatocytes. PAGE of hepatocyte membranes following exposure of the cells to 125I-ET-1 and cross-linking revealed labelling of three major proteins with apparent molecular masses of 32, 49 and 72 kDa. 125I-ET-1 labelling of each of these proteins was inhibited by unlabelled ET-1, whereas unlabelled ET-3 inhibited the labelling of only the 32 and 49 kDa proteins. 125I-ET-3 labelled the 49 kDa protein and this labelling was inhibited by both unlabelled ET-1 and ET-3. Each of these receptors appears to be functional, since both ET-1 and ET-3 stimulated phosphoinositide metabolism in hepatocytes. Down-regulation of ET-1 association and desensitization of ET-1-induced phosphoinositide metabolism occurred upon incubation of hepatocytes with the homologous ligand. Following down-regulation, the ET-1 receptor was restored to the surface of the hepatocyte by prolonged incubation, although the ET-1-stimulated phosphoinositide response remained inhibited even after complete recovery of the ET-1 association capability. These results demonstrate the presence of multiple high-affinity receptors for ET-1 on hepatocytes and the direct action of this peptide on hepatic parenchymal cells via the phosphoinositide signal transduction pathway.

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Selected References

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