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. 2009 Jun 28;15(24):3009-14.
doi: 10.3748/wjg.15.3009.

Influence of heme oxygenase-1 expression on immune liver fibrosis induced by cobalt protoporphyrin in rats

Fei Wang  1 , Zhi-Jun Duan, Ying-Jie Sun
Affiliations

Influence of heme oxygenase-1 expression on immune liver fibrosis induced by cobalt protoporphyrin in rats

Fei Wang et al. World J Gastroenterol. .

Abstract

Aim: To investigate the effect of heme oxygenase-1 (HO-1) expression on immune liver fibrosis induced by cobalt protoporphyrin (CoPP) in rats.

Methods: An immune liver fibrosis model of rat was established by administering human serum albumin (HSA). The rats were divided into CoPP, liver fibrosis and normal control groups. Rats in the CoPP group received intraperitoneal CoPP concurrently with HSA. Expression of HO-1 protein was observed by Western blotting and immunohistochemistry. Hematoxylin and eosin (HE) staining was performed to assess fibrosis proliferation and distribution, proliferation extent of fibroblasts, and alterations in hepatocytes and inflammatory cells. Type I and III collagens were detected with Van Gieson's (VG) staining and Foot's reticular fiber staining, respectively. In addition, spindle-shaped cells existing at perisinusoidal locations beyond portal and septa areas were investigated with HE staining.

Results: Western blotting and immunohistochemistry showed that the expression of HO-1 protein was higher in the CoPP group than in the liver fibrosis group (P < 0.05). Compared with the liver fibrosis group, the serological index of hepatic fibrosis in the CoPP group decreased significantly (P < 0.05). HE, VG and Foot's staining revealed that administration of CoPP reduced the extent of hepatic fibrosis. The levels of serological indicators and the number of spindle-shaped cells at perisinuous locations beyond the portal and septa areas were reduced in the CoPP group. Only a few inflammatory cells were seen around the portal areas and central veins in the CoPP group.

Conclusion: Increased endogenous HO-1 may suppress liver fibrosis by protecting liver cells, inhibiting inflammatory cell infiltration and hepatic stellate cell transformation.

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Figures

Figure 1
Figure 1
Western blotting of HO-1 protein expression (A) and densitometric analysis of HO-1/β-actin expression (B) in rat liver tissue.
Figure 2
Figure 2
HO-1 protein expressions in rat liver tissue of normal control group (A), liver fibrosis group (B), and CoPP group (C) (× 100).
Figure 3
Figure 3
HE staining (A), VG staining (B), and Foot’s staining (C) for liver tissues from rats in different groups (× 100).
See this image and copyright information in PMC

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