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Clin Sci (Lond). 2015 Nov;129(10):875-83. doi: 10.1042/CS20150117. Epub 2015 Jul 21.

Schistosome-induced cholangiocyte proliferation and osteopontin secretion correlate with fibrosis and portal hypertension in human and murine schistosomiasis mansoni.

Author information

1
Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, NC 27710, U.S.A. Laboratório de Patologia Experimental, Centro de Pesquisas Gonçalo Moniz/FIOCRUZ, Salvador, BA 40296-710, Brazil.
2
Liver Regeneration and Repair Research Group, Institute of Hepatology, Foundation for Liver Research, London WC1E 6HX, U.K. Department of Surgery, Loyola University, Chicago, Maywood, IL 60153, U.S.A.
3
Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, NC 27710, U.S.A.
4
Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte, MG 30130-100, Brazil.
5
Laboratório de Patologia Experimental, Centro de Pesquisas Gonçalo Moniz/FIOCRUZ, Salvador, BA 40296-710, Brazil.
6
Life Technologies, Frederick, MD 21704, U.S.A.
7
Núcleo de Doenças Infecciosas, Universidade Federal do Espírito Santo, Vitória, ES 29040-091, Brazil.
8
Centers for Disease Control and Prevention, Atlanta, GA 30329, U.S.A.
9
Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, NC 27710, U.S.A. diehl004@mc.duke.edu.

Abstract

Schistosomiasis is a major cause of portal hypertension worldwide. It associates with portal fibrosis that develops during chronic infection. The mechanisms by which the pathogen evokes these host responses remain unclear. We evaluated the hypothesis that schistosome eggs release factors that directly stimulate liver cells to produce osteopontin (OPN), a pro-fibrogenic protein that stimulates hepatic stellate cells to become myofibroblasts. We also investigated the utility of OPN as a biomarker of fibrosis and/or severity of portal hypertension. Cultured cholangiocytes, Kupffer cells and hepatic stellate cells were treated with soluble egg antigen (SEA); OPN production was quantified by quantitative reverse transcriptase polymerase chain reaction (qRTPCR) and ELISA; cell proliferation was assessed by BrdU (5-bromo-2'-deoxyuridine). Mice were infected with Schistosoma mansoni for 6 or 16 weeks to cause early or advanced fibrosis. Liver OPN was evaluated by qRTPCR and immunohistochemistry (IHC) and correlated with liver fibrosis and serum OPN. Livers from patients with schistosomiasis mansoni (early fibrosis n=15; advanced fibrosis n=72) or healthy adults (n=22) were immunostained for OPN and fibrosis markers. Results were correlated with plasma OPN levels and splenic vein pressures. SEA-induced cholangiocyte proliferation and OPN secretion (P<0.001 compared with controls). Cholangiocytes were OPN (+) in Schistosoma-infected mice and humans. Liver and serum OPN levels correlated with fibrosis stage (mice: r=0.861; human r=0.672, P=0.0001) and myofibroblast accumulation (mice: r=0.800; human: r=0.761, P=0.0001). Numbers of OPN (+) bile ductules strongly correlated with splenic vein pressure (r=0.778; P=0.001). S. mansoni egg antigens stimulate cholangiocyte proliferation and OPN secretion. OPN levels in liver and blood correlate with fibrosis stage and portal hypertension severity.

KEYWORDS:

Schistosomiasis mansoni; Symmers' fibrosis; cholangiocyte; ductular proliferation; osteopontin; portal hypertension

PMID:
26201095
PMCID:
PMC4558314
DOI:
10.1042/CS20150117
[Indexed for MEDLINE]
Free PMC Article

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