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Single cell analysis of tumor-infiltrating CD4+ T cell from Tc1- and Tc9- treated mouse

ABSTRACT: Single cell analysis of tumor-infiltrating CD4+ T cell from Tc1- and Tc9- treated mouse

PROVIDER: PRJNA1005204 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR25635248_1.fastq.gz	Fastqsanger.gz
	SRR25635248_2.fastq.gz	Fastqsanger.gz
	SRR25635249_1.fastq.gz	Fastqsanger.gz
	SRR25635249_2.fastq.gz	Fastqsanger.gz
	SRR25635250_1.fastq.gz	Fastqsanger.gz

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Single cell analysis of tumor-infiltrating CD4+ T cell from Tc1- and Tc9- treated mouse

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Project description:Microbial organisms play key roles in numerous physiological processes in the human body and have recently been shown to modify the response to cancer radiotherapy and immune checkpoint inhibitors. Here, we demonstrate that HLA molecules of both glioblastoma tissues as well as tumor cell lines present bacteria-specific peptides. This finding prompted us to examine whether tumor-infiltrating lymphocytes (TILs) recognize intratumoral microbiota. Indeed, bacterial peptides eluted from HLA-DR II molecules are recognized by both TILs, albeit weakly, and peripheral blood-derived memory CD4+ T cells, which, upon stimulation with bacterial peptides, also recognize several tumor antigens. Furthermore, using an unbiased antigen discovery approach for a TIL CD4+ T cell clone (TCC) we show that it recognizes a broad spectrum of peptides from pathogenic bacteria, commensal gut microbiota and also glioblastoma-related tumor antigens. These peptides were strongly stimulatory for bulk TILs and peripheral blood memory cells. Our data hint at how bacterial pathogens and bacterial gut microbiota can be involved in specific immune recognition of tumor antigens.

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Project description:Background: Adoptive cell therapy (ACT) with tumor infiltrating lymphocytes (TIL) is effective in treating PD-1 refractory melanoma, but requires adequate ex vivo expansion of TIL. Methods: CD4+ and CD8+ TIL from metastatic melanoma patients treated with TIL ACT were analyzed by RNA-seq (n=12) and ChIP-seq of acetylated histone 3 (n=19). Patients were grouped into “TIL high” and “TIL low” based on division at the median number of TIL infused. The number of TIL infused and CD4+ TIL frequency were correlated with overall survival (OS). Results: The number of TIL infused correlated with longer OS (R2=0.57, p=0.00076), and the percent of CD4+ infused was negatively correlated with the total number of TIL infused (R2=0.64, p=0.00047). RNA-seq analysis of CD4+ TIL showed increases in Th2/Th17/Treg transcripts and pathways in the TIL low group. ChIP-seq analysis of CD8+ TIL showed decreased acetylation in the TIL low group in genes upregulated during CD8+ activation. Conclusion: The numbers of TIL infused were associated with increased overall survival, while RNA-seq suggested that polarized CD4+ cells in the transferred TIL were associated with decreased overall expansion. These data suggest that improper CD4+ TIL polarization may reduce expansion and treatment efficacy.

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