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Expression of MMP-9 in hepatic sinusoidal obstruction syndrome induced by Gynura segetum

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Abstract

Background and objective

Hepatic sinusoidal obstruction syndrome (HSOS) is characterized by painful hepatomegaly, ascites, increased body weight, and jaundice. Gynura segetum (Compositae), a plant widely used in Chinese traditional medicine, often leads to the development of HSOS. However, the mechanism is unclear. The aim was to study the role of matrix metalloproteinase-9 (MMP-9) in the onset of HSOS induced by Gynura segetum.

Methods

Twenty-five male Sprague-Dawley rats were randomly divided into two groups. Twenty were exposed to 600 mg/kg daily Gynura segetum extract solution for three weeks; five control rats were exposed to tap water alone. Liver sections were evaluated by light microscopy with a modified scoring system. Routine transmission electron microscopy (TEM) methods were used to evaluate the ultrastructual features of fixed liver tissue, and blood samples were collected to determine liver enzyme concentrations. MMP-9 expression was assessed by both immunohistochemical staining and enzyme-linked immunosorbent assay (ELISA) methods.

Results

A stable and reproducible rat model of HSOS was achieved by long-term exposure to Gynura segetum extract. The treated rats presented clinical symptoms and the histopathological manifestation of HSOS, including abnormal liver enzyme concentrations (alanine aminotransferase (ALT): (84.8±13.62) vs. (167.0±72.63) U/L, P<0.05; aspartate aminotransferase (AST): (27.6±6.31) vs. (232.8±108.58) U/L, P<0.05). Hematoxylin and eosin (H&E) staining and TEM together revealed deposition of red blood cells, the damage and destruction of hepatic sinusoidal endothelial cells, collapse of hepatic sinusoids, hemorrhage of subendothelial cells, atrophy and destruction of hepatocytes, etc. Compared with controls, the expression of MMP-9 in the blood sample, the lung and liver tissues of HSOS rats was increased.

Conclusions

MMP-9 may have an important role in early pathological changes of HSOS, and thus the onset of the disease.

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Correspondence to Ting-bo Liang.

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Project supported by the National Natural Science Foundation of China (No. 30925033), and the Administration of Traditional Chinese Medicine of Zhejiang Province (No. 2007ZA016), China

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Yu, Xz., Ji, T., Bai, Xl. et al. Expression of MMP-9 in hepatic sinusoidal obstruction syndrome induced by Gynura segetum . J. Zhejiang Univ. Sci. B 14, 68–75 (2013). https://doi.org/10.1631/jzus.B1200112

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  • DOI: https://doi.org/10.1631/jzus.B1200112

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