Related Experiment Videos
Myofibroblasts in schistosomal portal fibrosis of man
Z A Andrade1, S Guerret, A L Fernandes
1Centro de Pesquisas Gonçalo Moniz-Fiocruz, BA, Brasil. zilton@server01.cpqgm.fiocruz.br
Abstract:
Myofibroblasts, cells with intermediate features between smooth muscle cells and fibroblasts, have been described as an important cellular component of schistosomal portal fibrosis. The origin, distribution and fate of myofibroblasts were investigated by means of light, fluorescent, immunoenzymatic and ultrastructural techniques in wedge liver biopsies from 68 patients with the hepatosplenic form of schistosomiasis. Results demonstrated that the presence of myofibroblasts varied considerably from case to case and was always related to smooth muscle cell dispersion, which occurred around medium-sized damaged portal vein branches. By sequential observation of several cases, it was evident that myofibroblasts derived by differentiation of vascular smooth muscle and gradually tended to disappear, some of them further differentiating into fibroblasts. Thus, in schistosomal pipestem fibrosis myofibroblasts appear as transient cells, focally accumulated around damaged portal vein branches, and do not seem to have by themselves any important participation in the pathogenesis of hepatosplenic schistosomiasis.
Insights
Myofibroblasts in schistosomiasis portal fibrosis originate from vascular smooth muscle cells. These transient cells accumulate around damaged portal veins but do not significantly drive hepatosplenic schistosomiasis pathogenesis.
Area of Science:
- Hepatology
- Cell Biology
- Parasitology
Background:
- Myofibroblasts are implicated in schistosomal portal fibrosis.
- Understanding their role is crucial for schistosomiasis pathogenesis research.
Purpose of the Study:
- To investigate the origin, distribution, and fate of myofibroblasts in hepatosplenic schistosomiasis.
- To clarify the contribution of myofibroblasts to schistosomal pipestem fibrosis.
Main Methods:
- Analysis of liver biopsies from 68 patients using light, fluorescent, immunoenzymatic, and ultrastructural techniques.
- Sequential observation of cases to track myofibroblast dynamics.
Main Results:
- Myofibroblast presence varied significantly among patients.
- Myofibroblasts were associated with dispersed smooth muscle cells around damaged portal vein branches.
- Myofibroblasts were observed to differentiate from vascular smooth muscle and subsequently into fibroblasts, indicating a transient nature.
Conclusions:
- Myofibroblasts are transient cells in schistosomal pipestem fibrosis.
- They accumulate focally around damaged portal veins but do not appear to be primary drivers of hepatosplenic schistosomiasis pathogenesis.