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Bile canaliculi morphology after bile duct ligation in the rat with portacaval shunt: a time course study
Insights
Portacaval shunts in rats did not alter cholestasis from bile duct ligation. Morphological liver changes, including hepatocyte size and bile canaliculi dilation, were similar in shunted and control animals.
Area of Science:
- Hepatology
- Surgical Pathology
- Gastroenterology
Background:
- Portacaval shunts are used for chronic liver diseases and portal hypertension.
- Shunts are being explored for treating metabolic diseases, particularly in pediatric patients.
- The portacaval shunt rat model induces liver atrophy, characterized by hepatocyte loss.
Purpose of the Study:
- To investigate morphological liver changes during cholestasis.
- To assess the impact of portacaval shunts on cholestasis-induced liver alterations.
- To examine cholestasis in shunted versus non-shunted rats using microscopy.
Main Methods:
- Portacaval or sham shunts were performed in rats.
- Bile duct ligation was induced two weeks post-surgery.
- Livers were analyzed using light and electron microscopy at multiple time points (5h, 20h, 4d, 8d).
Main Results:
- Portal inflammation and bile duct proliferation were similar in both groups.
- Patchy hepatic necrosis was more prevalent in shunted rats.
- Hepatocyte size increased in shunted rats but decreased in sham-operated rats; ultrastructural changes were comparable.
- Bile canaliculi showed initial dilation and increased cytoplasmic blebs over time, but did not exceed 50% of total sections.
Conclusions:
- Cholestasis induced by bile duct ligation exhibits similar characteristics in both portacaval shunted and control rats.
- Portacaval shunting does not significantly alter the morphological response to cholestasis in this rat model.
- Further research is needed to understand the role of shunts in metabolic diseases and their interaction with liver conditions.
Abstract:
Besides the spontaneous occurrence of portacaval shunts in chronic liver diseases and the performance of shunt to cure portal hypertension, shunts are now proposed for the treatment of some metabolic diseases, especially in children. The portacaval shunt model in the rat, known to induce liver atrophy related to hepatocyte loss and atrophy, was used to investigate morphological liver changes occurring in cholestasis. Two weeks after portacaval or sham portacaval shunt, the bile duct was ligated and livers were examined by light and electron microscopy at 5 h, 20 h, 4 days and 8 days. Portal inflammatory reaction and proliferation of bile ducts were identical but areas of patchy hepatic necrosis were more numerous in shunted rats. Hepatocyte size decreased in the sham group but increased in the other group. Hepatocyte ultrastructural changes were similar in the two groups. At 5 h, the number of bile canaliculi sections increased (X2) and 95% of them were normal. As time elapsed, the ratio of dilated bile canaliculi without microvilli and of bile canaliculi filled with cytoplasmic blebs increased but in no case reached 50% of the total. These results show that in the rat, cholestasis induced by bile duct ligation has approximately the same characteristics in control or shunted animals.