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The lectin Siglec-G functions as an inhibitory receptor in CD8+ T cell and can be targeted to enhance therapeutic antitumor immunity.

GSE255336 Mus musculus Expression profiling by high throughput sequencing 6 samples Submitted 2024/12/18 Platform GPL17021
Summary
CD8+ T cells play a critical role in cancer immune-surveillance and pathogens elimination. However, the effector function of CD8+ T cells may be severely influenced due to inhibitory receptors. Here we identify Siglec-G as a coinhibitory receptor that plays a critical role in limiting the function of CD8+ T cells. Siglec-G is highly expressed on both human and murine tumor-infiltrating T cells, and SiglecG+ T cells enriched in the exhausted T cell subset. CD24-Siglec-G-SHP2 axis negatively regulates PI3K-AKT signaling and impairs metabolic reprogramming in CD8+ T cells and thereby dampens their activation, expansion and cytotoxicity. Genetic ablation of Siglec-G can enhance the efficacy of adoptively transferred T cells and CAR T cells to repress the growth of solid tumors. These results define a key role for Siglec-G in inhibiting CD8+ T cell-dependent responses, which strongly suggested 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 PRJNA1074707 and SRA study SRP488948. Searching any of these in the dataset finder brings you back here.

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