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Updated: Apr 28, 2026
Quantification of Colonic Stem Cell Mutations
Published on: September 25, 2015
Phenotypic Analysis of Mice with Conditional Knockout of PPP2CA in Colonic Tissues
Zhihan Liu1, Chao Fang2, Jun Li3
1Department of General Surgery, The Affiliated Jiangning Hospital of Nanjing Medical University, Nanjing, Jiangsu, China.
Objective:
This study aimed to investigate the function and role of PPP2CA in the colon by analyzing the phenotype of colon-specific PPP2CA-knockout mice. PPP2CA is the gene encoding the catalytic subunit of serine/threonine protein phosphatases 2A (PP2A).
Methods:
A conditional knockout mouse model was established using the Cre/loxP system. Physiological changes in mice were recorded after tamoxifen-induced knockout. Phenotypic differences between wild-type mice and conditional knockout mice were observed through anatomical, molecular biological, label-free quantitative proteomic, and histological methods.
Results:
There were no significant differences in body weight and defecation between the knockout mice and wild-type mice. However, at the pathological level, the knockout group exhibited a higher abundance of goblet cells and increased proliferation of intestinal villus cells. Proteomic analysis indicated alterations in the expression of key proteins involved in processes such as metabolic reprogramming and immune response.
Conclusion:
The deletion of PPP2CA in the colon did not cause intestinal dysfunction; instead, it may enhance intestinal barrier function by promoting the proliferation of cells related to the mucosal barrier.
Insights
Deleting the PPP2CA gene in the colon did not impair intestinal function. Instead, knockout mice showed increased goblet cells and cell proliferation, suggesting enhanced intestinal barrier function.
Area of Science:
- Gastroenterology
- Molecular Biology
- Genetics
Background:
- PPP2CA encodes the catalytic subunit of protein phosphatase 2A (PP2A).
- The role of PPP2CA in colon physiology is not well understood.
Purpose of the Study:
- To investigate the function and role of PPP2CA in the colon.
- To analyze the phenotype of colon-specific PPP2CA-knockout mice.
Main Methods:
- Established a conditional knockout mouse model using the Cre/loxP system.
- Induced knockout via tamoxifen and analyzed physiological, anatomical, molecular, proteomic, and histological changes.
- Compared wild-type and knockout mice phenotypes.
Main Results:
- No significant differences in body weight or defecation were observed.
- Knockout mice showed increased goblet cell abundance and intestinal villus cell proliferation.
- Proteomic analysis revealed altered protein expression in metabolic reprogramming and immune response pathways.
Conclusions:
- Colon-specific deletion of PPP2CA does not cause intestinal dysfunction.
- PPP2CA may enhance intestinal barrier function by promoting mucosal barrier cell proliferation.
