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Gastric mucosa abnormalities and tumorigenesis in mice lacking the pS2 trefoil protein
O Lefebvre1, M P Chenard, R Masson
1Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/Université Louis Pasteur/Collège de France, Communauté Urbaine de Strasbourg, France.
Abstract:
To determine the function of the pS2 trefoil protein, which is normally expressed in the gastric mucosa, the mouse pS2 (mpS2) gene was inactivated. The antral and pyloric gastric mucosa of mpS2-null mice was dysfunctional and exhibited severe hyperplasia and dysplasia. All homozygous mutant mice developed antropyloric adenoma, and 30 percent developed multifocal intraepithelial or intramucosal carcinomas. The small intestine was characterized by enlarged villi and an abnormal infiltrate of lymphoid cells. These results indicate that mpS2 is essential for normal differentiation of the antral and pyloric gastric mucosa and may function as a gastric-specific tumor suppressor gene.
Insights
The mouse pS2 (mpS2) gene inactivation led to gastric dysfunction, hyperplasia, and tumors in mice. mpS2 protein is crucial for normal gastric mucosa differentiation and acts as a tumor suppressor.
Area of Science:
- Gastroenterology
- Molecular Biology
- Oncology
Background:
- The pS2 trefoil protein is normally expressed in the gastric mucosa.
- The specific function of pS2 in gastric tissue homeostasis and disease is not fully understood.
Purpose of the Study:
- To investigate the in vivo function of the mouse pS2 (mpS2) gene.
- To determine the role of mpS2 in gastric mucosa differentiation and tumor suppression.
Main Methods:
- Gene targeting to create mpS2-null mice.
- Histopathological analysis of gastric and small intestine tissues.
- Assessment of tumor development in mutant mice.
Main Results:
- mpS2-null mice exhibited dysfunctional antral and pyloric gastric mucosa with severe hyperplasia and dysplasia.
- All homozygous mutant mice developed antropyloric adenoma.
- 30% of mutant mice developed multifocal intraepithelial or intramucosal carcinomas.
- Small intestine showed enlarged villi and abnormal lymphoid cell infiltrate.
Conclusions:
- The mpS2 gene is essential for the normal differentiation of the antral and pyloric gastric mucosa.
- mpS2 may function as a gastric-specific tumor suppressor gene.
- Loss of mpS2 function contributes to gastric tumorigenesis.