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[Dynamic changes in hepatic myofibroblast of rabbits with Schistosoma japonicum]
1Institute of Infectious Diseases, Zhejiang Medical University, Hangzhou 310003.
Objective:
To observe the dynamic changes in hepatic myofibroblasts during the formation of schistosomal hepatic fibrosis and to investigate the pathogenesis of hepatic fibrosis.
Methods:
Each rabbit was infected with 80 +/- 1 S japonicum. Liver biopsies were done at different time point after infection and the samples were embedded with paraffin and stained with HE and picric acid-sirius red. The dynamic changes in the areas of granuloma were observed, and the extent of liver fibrosis and the expression of alpha-SMA positive cells were semiquantitated. At the 16th week after infection, the rabbits with S. japonicum were received IFN-gamma after treatment of praziquantel and contrasted with the saline group.
Results:
The granuloma appeared at the 6th week after infection and its areas reached the biggest at the 8th week. Then the granuloma shrinked gradually, but the extent of liver fibrosis aggravated progressively. The alpha-SMA positive cells were observed at the 4th week after infection and their number enhanced gradually. The extent of liver and the expression of alpha-SMA positive cells were significantly different between each treated group, and the IFN-gamma treated group showed the best result.
Conclusion:
The myofibroblasts play an essential role in the formation and development of schistosomal hepatic fibrosis.
Insights
Hepatic myofibroblasts are crucial in schistosomal hepatic fibrosis development. Interferon-gamma treatment improved fibrosis and alpha-smooth muscle actin expression in infected rabbits.
Area of Science:
- Hepatology
- Parasitology
- Immunology
Context:
- Schistosomiasis japonica causes significant liver damage and fibrosis.
- Hepatic fibrosis is a complex process involving myofibroblast activation.
- Understanding the dynamic changes in hepatic myofibroblasts is key to developing treatments.
Purpose:
- To observe dynamic changes in hepatic myofibroblasts during schistosomal hepatic fibrosis.
- To investigate the pathogenesis of hepatic fibrosis induced by Schistosoma japonicum.
- To evaluate the efficacy of interferon-gamma in treating established fibrosis.
Summary:
- Granulomas formed by week 6, peaking at week 8, then shrinking, while fibrosis and alpha-smooth muscle actin (SMA) positive cells progressively increased.
- Alpha-SMA positive cells, indicative of myofibroblasts, were detected by week 4 and increased over time.
- Interferon-gamma treatment, combined with praziquantel, significantly reduced fibrosis and alpha-SMA expression compared to saline controls, showing the best therapeutic outcome.
Impact:
- This study highlights the critical role of myofibroblasts in the pathogenesis of schistosomal hepatic fibrosis.
- The findings suggest that targeting myofibroblasts could be a viable therapeutic strategy for liver fibrosis.
- Interferon-gamma demonstrates potential as an adjunct therapy for schistosomiasis-induced liver fibrosis.