Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 104, Issue 28, Pages 11718-11723Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0702011104
Keywords
immunoglobulin; innate immunity; phylogeny
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Fc receptors are key players of the immune system that I ink the fine specificity of immunoglobulins and innate effector responses. Here, we describe a nonmammalian Fc gamma receptor, CHIR-AB1, a member of the leukocyte receptor complex, that binds IgY with high affinity with its single Ig domain. it is expressed on immature and mature B lymphocytes, monocytes, macrophages, and natural killer cells and harbors motifs of activating and inhibitory Fc receptors. In the absence of Fc epsilon Rl gamma, CHIR-AB1 can be expressed on B cells but cross-linking does not induce intracellular calcium release. In contrast, cells expressing CHIR-AB1 and Fc epsilon Rl gamma are triggered to release intracellular calcium upon stimulation with heat-aggregated IgY. CHIR-AB1 thus represents a primordial Fc receptor that combines features of different mammalian counterparts.
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