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Published on: November 27, 2014
Wip1-dependent modulation of macrophage migration and phagocytosis
Yiting Tang1, Bing Pan2, Xin Zhou3
1State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China.
Abstract:
Macrophage accumulation within the vascular wall is a hallmark of atherosclerosis. Controlling macrophage conversion into foam cells remains a major challenge for treatment of atherosclerotic diseases. Here, we show that Wip1, a member of the PP2C family of Ser/Thr protein phosphatases, modulates macrophage migration and phagocytosis associated with atherosclerotic plaque formation. Wip1 deficiency increases migratory and phagocytic activities of the macrophage under stress conditions. Enhanced migration of Wip1-/- macrophages is mediated by Rac1-GTPase and PI3K/AKT signalling pathways. Elevated phagocytic ability of Wip1-/- macrophages is linked to CD36 plasma membrane recruitment that is regulated by AMPK activity. Our study identifies Wip1 as an intrinsic negative regulator of macrophage chemotaxis. We propose that Wip1-dependent control of macrophage function may provide avenues for preventing or eliminating plaque formation in atherosclerosis.
Insights
Wip1 protein negatively regulates macrophage function in atherosclerosis. Wip1 deficiency enhances macrophage migration and phagocytosis, offering potential therapeutic targets for preventing plaque formation.
Area of Science:
- Vascular biology
- Immunology
- Cellular signaling
Background:
- Macrophage accumulation in vascular walls is central to atherosclerosis.
- Targeting macrophage foam cell formation is crucial for treating atherosclerotic diseases.
Purpose of the Study:
- To investigate the role of Wip1 (a protein phosphatase) in regulating macrophage function during atherosclerosis.
- To identify Wip1 as a potential therapeutic target for atherosclerosis.
Main Methods:
- Studied macrophage migration and phagocytosis in Wip1-deficient mice.
- Analyzed the involvement of Rac1-GTPase, PI3K/AKT, and AMPK signaling pathways.
- Investigated CD36 plasma membrane recruitment.
Main Results:
- Wip1 deficiency significantly enhanced macrophage migration and phagocytosis under stress.
- Enhanced migration was mediated by Rac1-GTPase and PI3K/AKT pathways.
- Increased phagocytosis in Wip1-deficient macrophages was linked to CD36 recruitment via AMPK activity.
Conclusions:
- Wip1 acts as an intrinsic negative regulator of macrophage chemotaxis.
- Wip1-dependent regulation of macrophage function presents novel therapeutic strategies for atherosclerosis prevention and plaque elimination.
