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Siglec-G suppresses CD8+ T cells responses through metabolic rewiring and can be targeted to enhance tumor immunotherapy

GSE272544 Mus musculus Expression profiling by high throughput sequencing 6 samples Submitted 2024/12/18 Platform GPL24247
Summary
CD8+ T cells play a critical role in cancer immune-surveillance and pathogens elimination. However, their effector function can be severely impaired due to inhibitory receptors such as PD-1 and Tim-3. Here we identify Siglec-G as a novel coinhibitory receptor that limits CD8+ T cell function. Siglec-G is highly expressed on tumor-infiltrating T cells and is enriched in the exhausted T cell subset. Ablation of Siglec-G enhances the efficacy of adoptively transferred T cells and CAR T cells to repress the growth of solid tumors. Mechanistically, sialic acids on tumor cells trigger Siglec-G-SHP2 axis in CD8+ T cells, and impairs metabolic reprogramming from OXPHOS to glycolysis, which dampens CTL activation, expansion and cytotoxicity. These findings define a critical role for Siglec-G in inhibiting CD8+ T cell responses, which strongly suggests its therapeutic effect in adoptive T cell therapy and tumor immunotherapy.
Published in
Siglec-G Suppresses CD8(+) T Cells Responses through Metabolic Rewiring and Can be Targeted to Enhance Tumor Immunotherapy
Yin S, Li C, Shen X et al. · Advanced science (Weinheim, Baden-Wurttemberg, Germany) 2024 · PMID 39373395 · doi:10.1002/advs.202403438
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Also filed as BioProject PRJNA1137322 and SRA study SRP520769. Searching any of these in the dataset finder brings you back here.

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