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Reduced gastric surface mucus layer in experimental portal hypertension
H Imanishi1, Y Harihara, Y Bandai
1Second Department of Surgery, Faculty of Medicine, University of Tokyo, Japan.
Abstract:
The pathogenesis of portal hypertensive gastropathy has not yet been thoroughly elucidated. Changes in the gastric surface mucus layer in prehepatic portal hypertensive and cirrhotic rat models were studied by observing frozen sections fixed with formaldehyde vapor and stained with hematoxylin and eosin. We produced prehepatic portal hypertensive rats by partial ligation of the portal vein, and cirrhotic rats by prolonged administration of carbon tetrachloride (CCl4) and phenobarbital sodium. The thickness of the corporal and antral gastric surface mucus was significantly reduced in prehepatic portal hypertensive and cirrhotic rats compared with the values obtained in control rats for portal hypertension (subjected to sham operation) and control rats for cirrhosis (treated with phenobarbital but not CCl4). These results indicate that the hemodynamic changes associated with portal hypertension reduce the thickness of the gastric surface mucus layer and may be one of the causes of the gastropathy associated with portal hypertension.
Insights
Portal hypertension, a condition affecting blood flow, thins the stomach
Area of Science:
- Gastroenterology
- Pathophysiology
- Medical Research
Background:
- The exact causes of portal hypertensive gastropathy remain unclear.
- Portal hypertension is linked to changes in gastric mucosal integrity.
Purpose of the Study:
- To investigate the impact of portal hypertension on the gastric surface mucus layer.
- To explore the role of hemodynamic changes in portal hypertensive gastropathy pathogenesis.
Main Methods:
- Prehepatic portal hypertension induced via partial portal vein ligation in rats.
- Cirrhosis induced by carbon tetrachloride (CCl4) and phenobarbital sodium administration in rats.
- Gastric surface mucus thickness assessed using hematoxylin and eosin staining of fixed tissue sections.
Main Results:
- Significantly reduced gastric surface mucus thickness observed in both prehepatic portal hypertensive and cirrhotic rat models.
- Comparison made against sham-operated control rats and control rats for cirrhosis.
Conclusions:
- Hemodynamic alterations in portal hypertension lead to a thinner gastric surface mucus layer.
- Reduced mucus thickness is a potential contributing factor to portal hypertensive gastropathy.