Identification and Characterization of the Hepatic Stellate Cell Transferrin Receptor

Overview

Journal Am J Pathol

Publisher Elsevier

Specialty Pathology

Date 2003 Apr 23

PMID 12707050

Citations 20

Authors

Kim R Bridle

Darrell H G Crawford

Grant A Ramm

Affiliations

Soon will be listed here.

Abstract

Activated hepatic stellate cells have been implicated in the fibrogenic process associated with iron overload, both in animal models and in human hemochromatosis. Previous studies have evaluated the role of ferritin/ferritin receptor interactions in the activation of stellate cells and subsequent fibrogenesis; however, the role of transferrin in hepatic stellate cell biology is unknown. This study was designed to identify and characterize the stellate cell transferrin receptor and to evaluate the influence of transferrin on stellate cell activation. Identification and characterization of the stellate cell transferrin receptor was determined by competitive displacement assays. The effect of transferrin on stellate cell activation was assessed using western blot analysis for alpha-smooth muscle actin expression, [(3)H]Thymidine incorporation, and real-time RT-PCR for procollagen alpha1(I) mRNA expression. A specific receptor for rat transferrin was observed on activated but not quiescent stellate cells. Transferrin significantly increased the expression of alpha-smooth muscle actin, but caused a decrease in proliferation. Transferrin induced a significant increase in procollagen alpha1(I) mRNA expression. In conclusion, this study has demonstrated for the first time a specific, high affinity receptor for rat transferrin on activated hepatic stellate cells, which via interaction with transferrin regulates stellate cell activation. This suggests that transferrin may be an important factor in the activation of hepatic stellate cells in conditions of iron overload.

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