Selective SIRPα blockade reverses tumor T cell exclusion and overcomes cancer immunotherapy resistance - Centre Eugène Marquis
Article Dans Une Revue Journal of Clinical Investigation Année : 2020

Selective SIRPα blockade reverses tumor T cell exclusion and overcomes cancer immunotherapy resistance

Bernard Vanhove

Résumé

T cell exclusion causes resistance to cancer immunotherapies via immune checkpoint blockade (ICB). Myeloid cells contribute to resistance by expressing signal regulatory protein-α (SIRPα), an inhibitory membrane receptor that interacts with ubiquitous receptor CD47 to control macrophage phagocytosis in the tumor microenvironment. Although CD47/SIRPα-targeting drugs have been assessed in preclinical models, the therapeutic benefit of selectively blocking SIRPα, and not SIRPγ/CD47, in humans remains unknown. We report a potent synergy between selective SIRPα blockade and ICB in increasing memory T cell responses and reverting exclusion in syngeneic and orthotopic tumor models. Selective SIRPα blockade stimulated tumor nest T cell recruitment by restoring murine and human macrophage chemokine secretion and increased anti-tumor T cell responses by promoting tumor-antigen crosspresentation by dendritic cells. However, nonselective SIRPα/SIRPγ blockade targeting CD47 impaired human T cell activation, proliferation, and endothelial transmigration. Selective SIRPα inhibition opens an attractive avenue to overcoming ICB resistance in patients with elevated myeloid cell infiltration in solid tumors.
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Dates et versions

hal-03001660 , version 1 (05-09-2024)

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Vanessa Gauttier, Sabrina Pengam, Justine Durand, Kevin Biteau, Caroline Mary, et al.. Selective SIRPα blockade reverses tumor T cell exclusion and overcomes cancer immunotherapy resistance. Journal of Clinical Investigation, 2020, 130 (11), pp.6109-6123. ⟨10.1172/JCI135528⟩. ⟨hal-03001660⟩
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