CD Markers

Topic Completed: 1 February 2002

Minor changes: 9 October 2020

Copyright: 2002-2021,, Inc.

PubMed Search: CD89

Nat Pernick, M.D.
Page views in 2020: 21
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Cite this page: Pernick N. CD89. website. Accessed January 15th, 2021.
Definition / general
  • Also called FCAR, FCalphaR
  • IgA Fc receptor, binds IgA and eliminates IgA coated targets
  • Induces phagocytosis, degranulation, respiratory burst and killing of microorganisms
  • Pathogenic group A and group B streptococci produce virulence factors that block the binding of IgA to CD89, inhibiting IgA-mediated immunity (J Biol Chem 2006;281:1389)
Uses by pathologists
  • No significant clinical use by pathologists
Positive staining - normal
  • Neutrophils, monocytes/macrophages, activated eosinophils, alveolar and splenic macrophages, interstitial dendritic cells
Negative staining
Additional references
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