Mapping CD4+ T Cell Landscapes in Glioblastoma Reveals Effectors and Bystanders
Hill, C. M.; Wang, A.; Maldonado, J.; Johanns, T. M.; Petti, A. A.; Dunn, G. P.
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The tumor immune microenvironment (TME) has been demonstrated to significantly shape glioblastoma (GBM) progression and therapeutic response, yet the role of CD4+ T cells remains incompletely defined. Here, by integrating single-cell RNA, surface-protein, and TCR profiling of 39,788 T cells from 16 high-grade gliomas with five matched blood samples, we mapped 23,550 CD4+ T cells across 11 states and revealed predominance of CD4+ T cells in primary, but not recurrent, tumors, alongside pronounced tumor-blood discordance. Clonal analyses revealed expansion of cytotoxic effector CD4+ T cells within tumors and TEMRA CD4+ T cells in blood. A small set of dominant clonotypes (0.2% of unique TCR{beta} sequences) accounted for >6% of all CD4+ T cells across both compartments and were shared across different transcriptional subsets, suggesting diverse transcriptional development stemming from a shared progenitor. In contrast, virally annotated clonotypes were broadly dispersed and largely unexpanded, consistent with bystander populations. Collectively, we investigated the cellular and clonal architecture of human CD4+ T cells in GBM and highlight the contrast between PBMC and TIL compartments.
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