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Augmented humoral and anaphylactic responses in FcγRII-deficient mice

Abstract

DESPITE its widespread distribution on both lymphoid and myeloid cells, the biological role of the low-affinity immuno-globulin-G receptor, FcγRII, is not fully understood. Defects in this receptor or its signalling pathway in B cells result in perturbations in immune-complex-mediated feedback inhibition of antibody production1–6. We now report that FcγRII-deficient animals display elevated immunoglobulin levels in response to both thymus-dependent and thymus-independent antigens. Additionally, the effector arm of the allergic response is perturbed in these mice. Mast cells from FcγRII−/− are highly sensitive to IgG-triggered degranulation, in contrast to their wild-type counterparts. FcγRII-deficient mice demonstrate an enhanced passive cutaneous analphylaxis reaction, the result of a decreased threshold for mast-cell activation by FcγRIII cross-linking. These results demonstrate that FcγRII acts as a general negative regulator of immune-complex-triggered activation in vivo for both the afferent and efferent limbs of the immune response. Exploiting this property offers new therapeutic opportunities for the treatment of allergic and autoimmune disorders.

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Takai, T., Ono, M., Hikida, M. et al. Augmented humoral and anaphylactic responses in FcγRII-deficient mice. Nature 379, 346–349 (1996). https://doi.org/10.1038/379346a0

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