Contribution of Hepatic Parenchymal and Nonparenchymal Cells to Hepatic Fibrogenesis in Biliary Atresia

Overview

Journal Am J Pathol

Publisher Elsevier

Specialty Pathology

Date 1998 Aug 26

PMID 9708812

Citations 46

Authors

G A Ramm

V G Nair

K R Bridle

R W Shepherd

D H Crawford

Affiliations

Soon will be listed here.

Abstract

Extrahepatic biliary atresia is a severe neonatal liver disease resulting from a sclerosing cholangiopathy of unknown etiology. Although biliary obstruction may be surgically corrected by a "Kasai" hepatoportoenterostomy, most patients still develop progressive hepatic fibrosis, although the source of increased collagen deposition is unclear. This study examined the role of hepatic stellate cells (HSCs) and assessed the source of transforming growth factor-beta (TGF-beta) production in hepatic fibrogenesis in patients with biliary atresia. Liver biopsies from 18 biliary atresia patients (including 5 pre- and post-Kasai) were subjected to immunohistochemistry for alpha-smooth muscle actin and in situ hybridization for either procollagen alpha1 (I) mRNA or TGF-beta1 mRNA. Sections were also subjected to immunohistochemistry for active TGF-beta1 protein. The role of Kupffer cells in TGF-beta1 production was assessed by immunohistochemistry for CD68. Procollagen alpha1 (I) mRNA was colocalized to alpha-smooth muscle actin-positive HSCs within the region of increased collagen protein deposition in fibrotic septa and surrounding hyperplastic bile ducts. The number of activated HSCs was decreased in only one post-Kasai biopsy. TGF-beta1 mRNA expression was demonstrated in bile duct epithelial cells and activated HSCs and in hepatocytes in close proximity to fibrotic septa. Active TGF-beta1 protein was demonstrated in bile duct epithelial cells and activated HSCs. This study provides evidence that activated HSCs are responsible for increased collagen production in patients with biliary atresia and therefore play a definitive role in the fibrogenic process. We have also shown that bile duct epithelial cells, HSCs, and hepatocytes are all involved in the production of the profibrogenic cytokine, TGF-beta1.

Citing Articles

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