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The Journal of Immunology, Vol 149, Issue 4 1365-1373, Copyright © 1992 by American Association of Immunologists
ARTICLES |
M Daeron, C Bonnerot, S Latour and WH Fridman
Laboratoire d'Immunologie Cellulaire et Clinique, INSERM U255, Institut Curie, Paris, France.
Murine Fc gamma RII and Fc gamma RIII have highly homologous extracellular domains, but unrelated transmembrane and intracytoplasmic (IC) domains. Murine Fc gamma RIIb1 and b2 are two isoforms of single- chain receptors which differ only by 47 aa in their IC domain. Murine Fc gamma RIII are composed of an IgG-binding alpha-chain, the intracellular portion of which is unrelated to that of Fc gamma RII, and of a homodimeric gamma-chain which also associates with Fc epsilon RI. Murine mast cells express Fc gamma RII, Fc gamma RIII, and Fc epsilon RI. They can be induced to degranulate by murine IgG immune complexes or by F(ab')2 fragments of the rat anti-murine Fc gamma RII/III mAb 2.4G2, complexed to mouse anti-rat (MAR) F(ab')2. In order to determine which murine Fc gamma R can activate mast cells, cDNA encoding murine Fc gamma RIIb1, Fc gamma RIIb2 or Fc gamma RIII alpha were stably transfected into RBL-2H3 cells. Murine Fc gamma RIII but not Fc gamma RIIb1 or Fc gamma RIIb2 induced serotonin release when aggregated by (2.4G2-MAR) F(ab')2 complexes. The respective roles of the IC domains of murine Fc gamma RIII subunits in signal transduction were investigated by stably transfecting cDNA encoding IC-deleted or chimeric murine Fc gamma R into RBL-2H3 cells. The substitution of the IC domain of murine Fc gamma RII for that of murine Fc gamma RIII gamma, but not that of murine Fc gamma RIII alpha, conferred the ability to trigger serotonin release. The deletion of IC sequences of the alpha subunit did not alter the ability of murine Fc gamma RIII to trigger serotonin release. It follows that 1) murine Fc gamma RIII, but not Fc gamma RII, can induce RBL cells to release serotonin, 2) the aggregation of the IC domain of the murine Fc gamma RIII gamma subunit is sufficient, but 3) the IC domain of the murine Fc gamma RIII alpha subunit is neither sufficient nor necessary for triggering serotonin release.
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