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Isolation, Characterization, and Purification of Macrophages from Tissues Affected by Obesity-related Inflammation
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CITED2 Restrains Proinflammatory Macrophage Activation and Response
Gun-Dong Kim1, Riku Das2, Xiaoquan Rao1
1Department of Medicine, Case Western Reserve University School of Medicine, Harrington Heart and Vascular Institute, Cleveland, Ohio, USA.
Molecular and Cellular Biology
|December 6, 2017
Summary
CITED2 is a key repressor of macrophage activation, balancing immune responses. Its deficiency leads to heightened inflammation and increased susceptibility to sepsis.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Macrophages are crucial for immune responses but require balanced activation/inhibition.
- Dysregulated macrophage activation contributes to inflammatory diseases.
Purpose of the Study:
- To identify novel regulators of macrophage activation.
- To investigate the role of CITED2 in modulating macrophage inflammatory responses.
Main Methods:
- Gain- and loss-of-function studies in macrophages.
- Analysis of peroxisome proliferator-activated receptor gamma (PPARγ) and hypoxia-inducible factor 1 alpha (HIF1α) pathways.
- In vivo studies using myeloid cell-specific Cited2 deletion in mice.
Main Results:
- CITED2 acts as a repressor of macrophage proinflammatory activation.
- CITED2 is essential for PPARγ activation and anti-inflammatory gene expression.
- Cited2 deficiency enhances inflammation via HIF1α stabilization, increasing sepsis susceptibility.
Conclusions:
- CITED2 is a novel negative regulator of macrophage activation.
- CITED2 plays a critical role in preventing excessive inflammation and protecting against sepsis.
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