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Schaubaecher J, Smiljanov B, Haring F, Steiger K, Wu Z, Ugurluoglu A, Luft J, Ballke S, Mahameed S, Schneewind V, Hildinger J, Canis M, Mittmann L, Braun C, Zuchtriegel G, Kaiser R, Nicolai L, Mack M, Weichert W, Lauber K, Uhl B, Reichel CA. Procoagulant platelets promote immune evasion in triple negative breast cancer. Blood 2024:blood.2023022928. [PMID: 38648571 DOI: 10.1182/blood.2023022928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 04/03/2024] [Accepted: 04/08/2024] [Indexed: 04/25/2024] Open
Abstract
Triple-negative breast cancer (TNBC) is an aggressive tumor entity, in which immune checkpoint (IC) molecules are primarily synthesized in the tumor environment. Here, we report that procoagulant platelets bear large amounts of such immunomodulatory factors and that the presence of these cellular blood components in TNBC relates to pro-tumorigenic immune cell activity and impaired survival. Mechanistically, tumor-released nucleic acids attract platelets into the aberrant tumor microvasculature where they undergo procoagulant activation, thus delivering specific stimulatory and inhibitory IC molecules. This concomitantly promotes pro-tumorigenic myeloid leukocyte responses and compromises anti-tumorigenic lymphocyte activity, ultimately supporting tumor growth. Interference with platelet-leukocyte interactions prevented immune cell misguidance and suppressed tumor progression, nearly as effective as systemic IC inhibition. Hence, our data uncover a self-sustaining mechanism of TNBC in utilizing platelets to misdirect immune cell responses. Targeting this irregular multicellular interplay might represent a novel immunotherapeutic strategy in TNBC without side effects of systemic IC inhibition.
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Affiliation(s)
| | | | | | | | - Zhengquan Wu
- Ludwig-Maximilians-Universität München, Munich, Germany
| | | | | | | | | | | | | | | | | | | | | | - Rainer Kaiser
- Department of Medicine I, University Hospital, LMU Munich, Munich, Germany
| | - Leo Nicolai
- University Hospital, LMU Munich, Munich, Germany
| | | | | | | | - Bernd Uhl
- Ludwig-Maximilians-Universität München, Munich, Germany
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