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Involvement of Host Fc Receptors in Antibody-Mediated Cutaneous Basophil Hypersensitivity Reactions¹

Department of Medicine, Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut 06510

Abstract

Cutaneous basophil hypersensitivity (CBH) reactions are heterogeneous delayed time course basophil-rich responses that can be mediated by either T cells, B cells, or serum antibodies. The current study examined the mechanism by which antibodies mediate CBH in guinea pigs. Fc competition experiments were constructed by passively transferring mixtures of anti-KLH serum and normal heterologous -globulins. It was found that rabbit IgG and its isolated and purified Fc fragment [but not the (Fab')₂ fragment] inhibited the ability of guinea pig immune serum to transfer CBH. Concurrent inhibition of transferred KLH-specific CBH and systemic passive cutaneous anaphylaxis (PCA) reactions by rabbit IgG or its Fc fragment, and not by sheep or bovine -globulins, indicated that Fc receptors on cutaneous mast cells were probably involved in both CBH and PCA.

It was also found that the basophil aspect of delayed cutaneous responses elicited by PHA was inhibited by Fc competition maneuvers. This could mean that some forms of apparently T cell-mediated CBH may be T cell dependent, but via secretion of molecules that bind to Fc receptors, as seems required in antibody-mediated CBH.

Footnotes

¹ This work was supported in part by grants from the United States Public Health Service (AI-12211 and AI-11077) and the American Cancer Society (IM-70E).

² Present address: Department of Medicine, Allergy and Rheumatology Section, University of Wisconsin Hospitals, 600 Highland Avenue, Madison, Wisconsin 53792.

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