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Assessing Hepatic Metabolic Changes During Progressive Colonization of Germ-free Mouse by 1H NMR Spectroscopy
Published on: December 15, 2011
Hyperammonemic coma after hepatectomy in germ-free rats.
Gastroenterology
|August 1, 1979
Summary
Eliminating gut bacteria did not alter the onset or ammonia levels in acute hepatic coma in rats. This suggests non-bacterial sources contribute to ammonia production in liver failure.
Area of Science:
- Gastroenterology
- Hepatology
- Toxicology
Background:
- Hepatic coma pathogenesis theories implicate intestinal bacteria producing cerebral toxins like ammonia.
- The role of intestinal bacteria in acute hepatic coma requires further investigation.
Purpose of the Study:
- To test if eliminating intestinal bacteria affects the onset and biochemical profile of acute hepatic coma.
- To investigate the contribution of intestinal bacteria to ammonia production in liver failure.
Main Methods:
- Comparison of germ-free and normal dehepatized rats.
- Measurement of coma onset and ammonia concentrations in blood and cecal contents.
- Assessment of ammonia levels after hepatic vascular exclusion.
Main Results:
- Germ-free rats exhibited identical coma onset (34 hr) to normal rats (36 hr).
- Arterial ammonia levels were similarly elevated in both groups.
- Cecal ammonia concentration was significantly lower in germ-free rats.
- Non-bacterial intestinal ammonia release was observed in germ-free animals.
Conclusions:
- Intestinal bacteria are of minor importance in acute hepatic coma pathogenesis in liverless rats.
- Ammonia, a presumed bacterial toxin, can originate from non-bacterial metabolism.
- Preventing hyperammonemia is crucial for understanding acute hepatic coma in anhepatic models.
