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Histochemical changes in livers from portacaval-shunted rats
Journal of the National Cancer Institute
|April 1, 1986
Summary
Portacaval shunt (PCS) surgery in rats altered liver enzyme activity and glycogen storage. Histochemical and morphological analyses showed no preneoplastic changes in hepatocytes post-PCS.
Area of Science:
- Hepatobiliary physiology
- Surgical research
- Toxicology
Background:
- Portacaval shunt (PCS) is a surgical procedure that alters portal blood flow to the liver.
- Understanding the long-term hepatic consequences of PCS is crucial for evaluating liver health and function.
- Previous studies suggest potential alterations in liver enzyme activity and cellular morphology following shunting procedures.
Purpose of the Study:
- To investigate the effects of portacaval shunt (PCS) on liver enzyme activity, glycogen storage, and hepatocyte morphology in rats.
- To determine if PCS induces preneoplastic or neoplastic changes in the liver, particularly when combined with a carcinogen.
- To assess the impact of phenobarbital sodium on GGT distribution post-PCS.
Main Methods:
- Portacaval shunt (PCS) operations were performed on male Sprague-Dawley rats.
- Liver gamma-glutamyltranspeptidase (GGT) and glucose-6-phosphatase activities were assessed histochemically.
- Hepatocyte morphology and glycogen storage capacity were evaluated.
- Rats were treated with phenobarbital sodium or diethylnitrosamine (DEN) to assess their influence on PCS-induced changes.
Main Results:
- PCS increased GGT activity in periportal endothelial cells, which persisted long-term.
- Glucose-6-phosphatase activity initially disappeared from centrilobular areas but normalized over time.
- Hepatocyte morphology and glycogen storage were altered, but changes were not consistent with preneoplastic lesions.
- Combined PCS and DEN treatment did not induce preneoplastic or neoplastic changes within 10 months.
Conclusions:
- PCS significantly alters specific liver enzyme distributions and metabolic functions, primarily affecting periportal areas.
- The observed morphologic and histochemical changes following PCS in rats do not mimic preneoplastic liver conditions.
- PCS alone or in combination with DEN does not appear to promote hepatocarcinogenesis in this model within the observed timeframe.