期刊
GUT
卷 60, 期 1, 页码 108-115出版社
B M J PUBLISHING GROUP
DOI: 10.1136/gut.2010.219741
关键词
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资金
- MIUR [2007 - prot. 2007HPT7BA_002]
- Universita Politecnica delle Marche
- Progetto di Ateneo [CPDA083217/08]
- NIH [DK079005]
- Yale University Liver Center [NIH DK34989]
- Fondazione S Martino, Bergamo
- [GGP09189]
- NATIONAL INSTITUTE OF DIABETES AND DIGESTIVE AND KIDNEY DISEASES [P30DK034989, R01DK079005] Funding Source: NIH RePORTER
- Fondazione Telethon Funding Source: Custom
Objective To study the mechanism(s) linking insulin resistance (IR) to hepatic fibrosis and the role of the epithelial component in tissue repair and fibrosis in chronic hepatitis C (CHC). Design Prospective observational study. Setting Tertiary care academic centre. Patients 78 consecutive patients with CHC. Main outcome measures IR, calculated by the oral glucose insulin sensitivity during oral glucose tolerance test; necroinflammatory activity and fibrosis, defined according to Ishak's score; steatosis, graded as 0 (< 5% of hepatocytes), 1 (5-33%), 2 (33-66%) and 3 (> 66%). To evaluate the role of the epithelial component in tissue repair and fibrosis, the expansion of the ductular reaction (DR) was calculated by keratin-7 (CK7) morphometry. Nuclear expression of Snail, downregulation of E-cadherin and expression of fibroblast specific protein-1 (FSP1) and vimentin by CK7-positive cells were used as markers of epithelial-mesenchymal transition in DR elements. Results IR, the degree of necroinflammation and expansion of the DR (stratified as reactive ductular cells (RDCs), hepatic progenitor cells and intermediate hepatobiliary cells according to morphological criteria) were all associated with the stage of fibrosis. Nuclear Snail expression, E-cadherin downregulation and vimentin upregulation were observed in RDCs. By dual immunofluorescence for CK7 and FSP1, the number of RDCs undergoing epithelial-mesenchymal transition progressively increased together with the necroinflammatory score. By multivariate analysis, total inflammation and insulin resistance were the only factors significantly predicting the presence of advanced fibrosis (Ishak score >= 3) and the expansion of RDCs. Conclusion This study indicates that IR is associated with the degree of necroinflammatory injury in CHC and contributes to hepatic fibrosis by stimulating the expansion of RDCs that express epithelial-mesenchymal transition markers.
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