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Hepatocytes in the mouse stomach
J R Leininger1, M M McDonald, D P Abbott
1National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709.
Toxicologic Pathology
|January 1, 1990
Summary
Hepatocytes were incidentally found in the stomachs of mice during toxicity studies. These findings, appearing as nodules, suggest potential congenital anomalies or metaplasia, but are not cancerous.
Area of Science:
- Toxicology
- Gastroenterology
- Cell Biology
Background:
- Hepatocytes are typically found in the liver, not the stomach.
- Incidental findings in animal studies can provide insights into unexpected biological processes.
Purpose of the Study:
- To document and characterize the occurrence of hepatocytes in the stomach of mice.
- To investigate the potential origin and nature of these ectopic hepatocytes.
Main Methods:
- Histological and ultrastructural examination of stomach tissues from mice in toxicity bioassays.
- Gross examination of stomach nodules.
Main Results:
- Hepatocytes were observed in the submucosa and lamina propria of the glandular and forestomach in 4 mice.
- Nodules were present in 2 mice, measuring 1.0-5.0 mm.
- Associated gastric gland changes included dilation, hyperplasia, mineralization, and microherniation.
- Ultrastructural analysis revealed well-differentiated hepatocytes with organelles and bile canaliculus-like structures.
- No evidence of malignancy was found.
Conclusions:
- Ectopic hepatocytes in the mouse stomach are incidental findings, not indicative of cancer.
- Potential explanations include congenital anomaly or post-natal transdifferentiation (metaplasia).
- Further research is needed to determine the definitive origin and pathogenesis.
