ICOSL/ICOS are costimulatory molecules pertaining to immune checkpoints; their binding transduces signals having anti-tumor activity. Osteopontin (OPN) is here identified as a ligand for ICOSL. OPN binds a different domain from that used by ICOS, and the binding induces a conformational change in OPN, exposing domains that are relevant for its functions. Here we show that in vitro, ICOSL triggering by OPN induces cell migration, while inhibiting anchorage-independent cell growth. The mouse 4T1 breast cancer model confirms these data. In vivo, OPN-triggering of ICOSL increases angiogenesis and tumor metastatization. The findings shed new light on ICOSL function and indicate that another partner beside ICOS may be involved; they also provide a rationale for developing alternative therapeutic approaches targeting this molecular trio.

Osteopontin binds ICOSL promoting tumor metastasis

Dianzani C.
Co-first
;
Maione F.;
2020-01-01

Abstract

ICOSL/ICOS are costimulatory molecules pertaining to immune checkpoints; their binding transduces signals having anti-tumor activity. Osteopontin (OPN) is here identified as a ligand for ICOSL. OPN binds a different domain from that used by ICOS, and the binding induces a conformational change in OPN, exposing domains that are relevant for its functions. Here we show that in vitro, ICOSL triggering by OPN induces cell migration, while inhibiting anchorage-independent cell growth. The mouse 4T1 breast cancer model confirms these data. In vivo, OPN-triggering of ICOSL increases angiogenesis and tumor metastatization. The findings shed new light on ICOSL function and indicate that another partner beside ICOS may be involved; they also provide a rationale for developing alternative therapeutic approaches targeting this molecular trio.
2020
3
1
615
615
https://www.nature.com/articles/s42003-020-01333-1
Raineri D.; Dianzani C.; Cappellano G.; Maione F.; Baldanzi G.; Iacobucci I.; Clemente N.; Baldone G.; Boggio E.; Gigliotti C.L.; Boldorini R.; Rojo J.M.; Monti M.; Birolo L.; Dianzani U.; Chiocchetti A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1781510
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