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NK cell–mediated cytotoxicity contributes to tumor control by a cytostatic drug combination

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Science  21 Dec 2018:
Vol. 362, Issue 6421, pp. 1416-1422
DOI: 10.1126/science.aas9090

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Small molecules spark NK cell response

Immunotherapy is a powerful treatment for certain cancers. Yet for those patients that do not respond, simultaneous strategies that mobilize the immune system and directly target malignant cells may be more effective. Ruscetti et al. report that combining two clinically approved cancer drugs promoted immune surveillance and killing of KRAS-mutant lung tumors in mice (see the Perspective by Cornen and Vivier). The two small molecules—a mitogen-activated protein kinase inhibitor and a cyclin-dependent kinase 4/6 inhibitor—induced natural killer (NK) cell recruitment and elimination of senescent lung cancer cells, which did not occur when either agent was used alone.

Science, this issue p. 1416; see also p. 1355

Abstract

Molecularly targeted therapies aim to obstruct cell autonomous programs required for tumor growth. We show that mitogen-activated protein kinase (MAPK) and cyclin-dependent kinase 4/6 inhibitors act in combination to suppress the proliferation of KRAS-mutant lung cancer cells while simultaneously provoking a natural killer (NK) cell surveillance program leading to tumor cell death. The drug combination, but neither agent alone, promotes retinoblastoma (RB) protein-mediated cellular senescence and activation of the immunomodulatory senescence-associated secretory phenotype (SASP). SASP components tumor necrosis factor–α and intercellular adhesion molecule–1 are required for NK cell surveillance of drug-treated tumor cells, which contributes to tumor regressions and prolonged survival in a KRAS-mutant lung cancer mouse model. Therefore, molecularly targeted agents capable of inducing senescence can produce tumor control through non–cell autonomous mechanisms involving NK cell surveillance.

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