MAIT cells and MR1 play an immunosuppressive role in glioblastoma through the induction of neutrophils and MDSCs
Hana, T.; Terabe, M.
Show abstract
Glioblastoma (GBM) is the most aggressive primary brain cancer in adults and remains incurable. Our study revealed an immunosuppressive role of mucosal-associated invariant T (MAIT) cells in GBM. In bulk RNA sequencing data analysis of GBM tissues, MAIT cell gene signature significantly correlated with poor patient survival. A scRNA-seq of CD45+ cells from 23 GBM tissue samples showed 15 (65.2%) were positive for MAIT cells and the enrichment of MAIT17. The MAIT cell signature significantly correlated with the activity of tumor-associated neutrophils (TANs) and myeloid-derived suppressor cells (MDSCs). Multiple immune suppressive genes known to be used by TANs/MDSCs were upregulated in MAIT-positive tumors. Spatial imaging analysis of GBM tissues showed that all specimens were positive for both MAIT cells and TANs and localized enrichment of TANs. These findings highlight the MAIT-TAN/MDSC axis as a novel therapeutic target to modulate GBMs immunosuppressive tumor microenvironment.
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