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Ulcerative colitis and adenocarcinoma of the colon in G alpha i2-deficient mice
U Rudolph1, M J Finegold, S S Rich
1Department of Cell Biology, Baylor College of Medicine, Houston, Texas 77030, USA.
Abstract:
G proteins are involved in cellular signalling and regulate a variety of biological processes including differentiation and development. We have generated mice deficient for the G protein subunit alpha i2 (G alpha i2) by homologous recombination in embryonic stem cells. G alpha i2-deficient mice display growth retardation and develop a lethal diffuse colitis with clinical and histopathological features closely resembling ulcerative colitis in humans, including the development of adenocarcinoma of the colon. Prior to clinical symptoms, the mice show profound alterations in thymocyte maturation and function. The study of these animals should provide important insights into the pathogenesis of ulcerative colitis as well as carcinogenesis.
Insights
Mice lacking the G protein subunit alpha i2 (Gαi2) developed growth retardation, colitis, and colon cancer, offering insights into human ulcerative colitis and cancer development.
Area of Science:
- Cellular signaling
- Molecular biology
- Immunology
Background:
- G proteins are crucial for cellular signaling pathways.
- These pathways regulate vital biological processes like differentiation and development.
- Dysregulation of G protein signaling is implicated in various diseases.
Purpose of the Study:
- To investigate the role of the G protein subunit alpha i2 (Gαi2) in biological processes.
- To generate and characterize Gαi2-deficient mice.
- To explore the potential link between Gαi2 deficiency and inflammatory bowel disease or cancer.
Main Methods:
- Homologous recombination in embryonic stem cells was used to create Gαi2-deficient mice.
- Phenotypic analysis of the generated Gαi2-deficient mice.
- Histopathological examination of tissues from deficient mice.
Main Results:
- Gαi2-deficient mice exhibited growth retardation.
- These mice developed a lethal diffuse colitis mirroring human ulcerative colitis.
- Colon adenocarcinoma developed in Gαi2-deficient mice.
- Profound alterations in thymocyte maturation and function were observed prior to clinical symptoms.
Conclusions:
- Gαi2 deficiency leads to severe gastrointestinal pathology and cancer development.
- The Gαi2-deficient mouse model offers valuable insights into ulcerative colitis pathogenesis.
- This model can advance understanding of colitis-associated carcinogenesis.