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Anti-KIR antibody enhancement of anti-lymphoma activity of natural killer cells as monotherapy and in combination with anti-CD20 antibodies. Blood Kohrt, H. E., Thielens, A., Marabelle, A., Sagiv-Barfi, I., Sola, C., Chanuc, F., Fuseri, N., Bonnafous, C., Czerwinski, D., Rajapaksa, A., Waller, E., Ugolini, S., Vivier, E., Romagné, F., Levy, R., Bléry, M., André, P. 2014; 123 (5): 678-686

Abstract

Natural killer (NK) cells mediate anti-lymphoma activity by spontaneous cytotoxicity and antibody-dependent cell-mediated cytotoxicity (ADCC) when triggered by rituximab, an anti-CD20 monoclonal antibody (mAb) used to treat patients with B cell lymphomas. The balance of inhibitory and activating signals determines the magnitude of NK cell's efficacy by spontaneous cytoxicity. Here, using a killer cell immunoglobulin-like receptor (KIR) transgenic murine model, we show that blockade of the interface of inhibitory KIRs with MHC class I antigens on lymphoma by anti-KIR antibodies prevents a tolerogenic interaction and augments NK cell spontaneous cytotoxicity. In combination with anti-CD20 mAbs, anti-KIR treatment induces enhanced NK cell-mediated, rituximab-dependent cytotoxicity against lymphoma in vitro and in vivo in KIR transgenic and syngeneic murine lymphoma models. These results support a therapeutic strategy of combination, rituximab and KIR blockade through lirilumab, illustrating the potential efficacy of combining a tumor targeting therapy with an NK cell agonist thus stimulating the post-rituximab anti-lymphoma immune response.

View details for DOI 10.1182/blood-2013-08-519199

View details for PubMedID 24326534