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Depletion and Reconstitution of Macrophages in Mice
Published on: August 1, 2012
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A20 functions as a negative regulator in macrophage for DSS-induced colitis
Tian Pu1, Wenzheng Liu2, Yijun Wu1
1Department of Gastroenterology, The First Affiliated Hospital of Zhengzhou University, No. 1 Jianshe East Road, Zhengzhou 450052, Henan, China.
International Immunopharmacology
|June 1, 2021
Summary
A20 protein suppresses inflammatory cytokine production in macrophages by inhibiting the NF-κB pathway, thereby alleviating symptoms of dextran sodium sulfate (DSS)-induced colitis in mice.
Area of Science:
- Immunology
- Molecular Biology
- Gastroenterology
Background:
- A20 (TNFAIP3) is a deubiquitinating enzyme known for its role in regulating inflammatory and autoimmune diseases.
- Its specific function in macrophages and its impact on inflammatory bowel disease, such as dextran sodium sulfate (DSS)-induced colitis, require further investigation.
Purpose of the Study:
- To investigate the role of A20 in macrophages during DSS-induced colitis.
- To elucidate the molecular mechanisms by which A20 regulates inflammation in this model.
Main Methods:
- Generation of myeloid cell-specific A20 knockout mice (Tnfaip3fl/fl Lyz2-Cre).
- Induction of colitis using dextran sodium sulfate (DSS).
- Analysis of cytokine expression (qRT-PCR, ELISA), NF-κB signaling pathway activity (Western blot), and macrophage function (BMDMs treated with LPS).
Main Results:
- A20 deficiency in macrophages did not affect macrophage development but enhanced pro-inflammatory cytokine production upon LPS stimulation.
- Mice lacking A20 in myeloid cells exhibited exacerbated DSS-induced colitis symptoms.
- A20 deficiency upregulated NF-κB signaling activity, and inhibiting this pathway ameliorated colitis severity in A20 knockout mice.
Conclusions:
- A20 functions to suppress pro-inflammatory cytokine expression in macrophages via the NF-κB signaling pathway.
- A20 plays a critical protective role in mitigating the pathogenesis of DSS-induced colitis.
