Deciphering the role of signal regulatory protein α in immunotherapy for solid tumors
Therapies targeting immune checkpoints like programmed death receptor-1 and programmed death ligand-1 have demonstrated remarkable effectiveness in combating cancer. However, a subset of patients fails to respond to these therapies, underscoring the complexity of tumor immune evasion mechanisms. Exp...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2025-06-01
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| Series: | Frontiers in Immunology |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fimmu.2025.1612234/full |
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| Summary: | Therapies targeting immune checkpoints like programmed death receptor-1 and programmed death ligand-1 have demonstrated remarkable effectiveness in combating cancer. However, a subset of patients fails to respond to these therapies, underscoring the complexity of tumor immune evasion mechanisms. Exploring innovative immune regulatory targets represents a crucial research priority in this field. Signal regulatory protein α (SIRPα) is an immunosuppressive receptor expressed on myeloid cells that inhibits innate immunity through its interaction with the ligand integrin-associated protein (CD47). Blocking the SIRPα–CD47 axis can enhance myeloid cell-mediated anti-tumor responses and stimulate adaptive immunity, thereby synergizing with therapeutic antibodies and T-cell checkpoint inhibitors. Additionally, tumor-intrinsic SIRPα may facilitate tumor growth and immune evasion. This paper aims to elucidate the mechanisms of SIRPα activity in various cell types, review the advancements in SIRPα-targeted tumor therapies, and highlight the potential research value of tumor-expressed endogenous SIRPα. |
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| ISSN: | 1664-3224 |