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Cyto fluorographic analysis of receptors for immuno globulin a on human polymorphonuclear cells and monocytes and the correlation of receptor expression with phagocytosis

, : Cyto fluorographic analysis of receptors for immuno globulin a on human polymorphonuclear cells and monocytes and the correlation of receptor expression with phagocytosis. Molecular Immunology 20(9): 1019-1028

Receptors for the Fc portion of IgA (RFc.alpha.) were identified on human monocytes and polymorphonuclear cells (PMN) by cytofluorograph analysis using FITC[fluorescein isothiocyanate]-labeled IgA and by rosette formation with IgA-sensitized indicator cells. Larger percentages of PMN obtained from the oral cavity expressed RFc.alpha. than did blood PMN. These oral PMN also expressed more RFc.alpha. per cell than blood PMN. The expression of these receptors on blood PMN was enhanced by overnight incubation with IgA. In functional studies, RFc.alpha. appeared to cooperate with receptors for IgG in enhancing blood and oral PMN mediated phagocytosis of target cells coated with IgG and IgA. In contrast with blood PMN, oral PMN were capable of phagocytosing target cells coated with IgA alone. Receptors for IgA may be important to the ability of RFc.alpha. bearing effector cell populations to mediate protection at mucosal surfaces.


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