Filamin a binds to CCR2B and regulates its internalization
Laura Minsaas1, Jesús Planagumà, Michael Madziva
1Department of Biomedicine, University of Bergen, Bergen, Norway.
Plos One
|September 3, 2010
Summary
Filamin A (FLNa) binds to the chemokine receptor CCR2B, influencing its internalization and localization. This interaction is crucial for monocyte migration in inflammatory diseases.
Area of Science:
- Cell Biology
- Immunology
- Molecular Biology
Background:
- Chemokine receptor CCR2B mediates monocyte recruitment in chronic inflammation.
- CCR2B is a receptor for monocyte chemoattractant protein-1 (CCL2).
Purpose of the Study:
- To identify proteins interacting with CCR2B.
- To investigate the role of filamin A (FLNa) in CCR2B function.
Main Methods:
- Yeast two-hybrid system to identify interacting proteins.
- Co-immunoprecipitation and in vitro pull-down assays to confirm binding.
- Cellular localization studies (colocalization) and siRNA-mediated knockdown.
Main Results:
- Filamin A (FLNa) was identified as a binding partner of CCR2B.
- FLNa constitutively binds to CCR2B, colocalizing at the cell surface, internalized vesicles, and lamellipodia.
- FLNa deficiency delays CCR2B internalization and reduces MCP-1-induced monocyte migration.
Conclusions:
- Filamin A is essential for CCR2B internalization and localization.
- FLNa plays a critical role in CCR2B-mediated monocyte migration.
- Targeting the FLNa-CCR2B interaction may offer therapeutic strategies for inflammatory diseases.
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