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Radil controls neutrophil adhesion and motility through β2-integrin activation
Lunhua Liu1, Wulin Aerbajinai, Syed M Ahmed
1Laboratory of Cellular and Molecular Biology, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA.
Molecular Biology of the Cell
|October 26, 2012
Summary
Radil, a Rap1 effector, is crucial for neutrophil integrin activation and chemotaxis. It links Rap1 signaling to β2-integrin activation, controlling cell adhesion and migration during inflammatory responses.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Integrin activation is essential for neutrophil functions like chemotaxis, vital for immunity.
- Mechanisms regulating neutrophil integrin activation remain poorly understood.
Purpose of the Study:
- To investigate the role of Radil, a novel Rap1 effector, in neutrophil integrin activation and chemotaxis.
Main Methods:
- Studied Radil translocation, cell adhesion, integrin/FAK activation, and morphology in neutrophils.
- Utilized Radil overexpression, knockdown, RapGAP coexpression, and inhibitory antibodies/drugs.
Main Results:
- Radil translocates to the plasma membrane in a Rap1a-GTP-dependent manner during neutrophil activation.
- Radil overexpression enhances cell adhesion and integrin/FAK activation, causing tail retraction defects.
- Radil knockdown inhibits cell adhesion, β2-integrin activation, and chemotaxis.
- Rap inhibition blocks Radil-mediated activation and adhesion.
Conclusions:
- Radil is a key regulator of neutrophil adhesion and motility.
- Radil links Rap1 signaling to β2-integrin activation, controlling neutrophil chemotaxis and inflammatory responses.
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