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Cutting edge: mouse CD300f (CMRF-35-like molecule-1) recognizes outer membrane-exposed phosphatidylserine and can

Seung-Chul Choi1, Venkateswara R Simhadri, Linjie Tian

  • 1Receptor Cell Biology Section, Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|August 26, 2011
PubMed

Insights

CD300f protein binds to dead cells and phosphatidylserine, enhancing phagocytosis. This discovery offers new insights into immune cell interactions and inflammation regulation.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • CD300f is known to regulate dendritic and T cell interactions.
  • It acts as an anti-inflammatory molecule in a multiple sclerosis mouse model.

Purpose of the Study:

  • To investigate the binding properties and cellular functions of CD300f.
  • To elucidate the molecular mechanisms underlying CD300f-mediated immune regulation.

Main Methods:

  • Utilized CD300f/Fc chimeric protein to test binding to various cell types.
  • Employed ELISA, cosedimentation, and surface plasmon resonance with liposomes.
  • Assessed phagocytosis of apoptotic cells following exogenous CD300f expression.

Main Results:

  • CD300f/Fc specifically binds to apoptotic splenocytes and lymphocytic cell lines.
  • Binding occurs preferentially to phosphatidylserine and requires metal ions.
  • CD300f expression enhances phagocytosis of apoptotic cells.

Conclusions:

  • CD300f recognizes phosphatidylserine, a key molecule on apoptotic cells.
  • This recognition enhances the phagocytic capacity of myeloid cells.
  • CD300f plays a significant role in the clearance of dead cells and immune modulation.

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