Benralizumab is an anti-eosinophil, humanised afucosylated, monoclonal antibody (IgG1, kappa) that binds to the alpha subunit of the human interleukin-5 receptor (IL-5Rα) with high affinity and specificity. The IL-5 receptor is specifically expressed on the surface of eosinophils and basophils. The absence of fucose in the Fc domain of benralizumab results in high affinity for FcɣRIII receptors on immune effectors cells such as natural killer (NK) cells. This leads to apoptosis of eosinophils and basophils through enhanced antibody-dependent cell-mediated cytotoxicity (ADCC), which reduces eosinophilic inflammation.
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