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The Preexisting T Cell Landscape Determines Response to T Cell-Engagers Therapy

ABSTRACT: Adaptive immunotherapy including bispecific T cell engagers (TCE) has shown promise in the treatment of various cancers, but clinical responses are heterogeneous and often not durable. As response to TCE is suggested to be independent of tumor recognition and T cell state, molecular determinants or mediators of primary and acquired resistance towards TCE remain poorly understood. Here, we identify conserved behaviors of bone marrow residing CD4+ and CD8+ T cells in multiple myeloma patients undergoing TCE therapy. We show that the bone marrow immune landscape reacts to TCE therapy with cell state-dependent clonal T cell expansion and herewith infer coupling of tumor recognition via MHC-I, T cell exhaustion and clinical response. While we find the abundance of exhausted-like memory CD8+ T cell clones to be associated with clinical response failure, we describe loss of target epitope and MHC class I expression as tumor-intrinsic mechanisms of acquired resistance to TCE.

ORGANISM(S): Homo sapiens

PROVIDER: GSE216571 | GEO | 2022/10/28

REPOSITORIES: GEO

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The Preexisting T Cell Landscape Determines Response to T Cell-Engagers Therapy

Project description:Adaptive immunotherapy including bispecific T cell engagers (TCE) has shown promise in the treatment of various cancers, but clinical responses are heterogeneous and often not durable. As response to TCE is suggested to be independent of tumor recognition and T cell state, molecular determinants or mediators of primary and acquired resistance towards TCE remain poorly understood. Here, we identify conserved behaviors of bone marrow residing CD4+ and CD8+ T cells in multiple myeloma patients undergoing TCE therapy. We show that the bone marrow immune landscape reacts to TCE therapy with cell state-dependent clonal T cell expansion and herewith infer coupling of tumor recognition via MHC-I, T cell exhaustion and clinical response. While we find the abundance of exhausted-like memory CD8+ T cell clones to be associated with clinical response failure, we describe loss of target epitope and MHC class I expression as tumor-intrinsic mechanisms of acquired resistance to TCE.

2023-03-09 | GSE217245 | GEO

IL-7-primed bystander CD8 tumor-infiltrating lymphocytes optimize the antitumor efficacy of T-cell engager immunotherapy in solid tumors

Project description:Bispecific T-cell engagers (TCEs) show promising clinical efficacy in blood tumors, but their application to solid tumors with immunosuppressive environments remains challenging. Here, we show that Fc-fused IL-7 (rhIL-7-hyFc) changes the intratumoral CD8 T cell landscape, allowing TCE-immunotherapy to function effectively in solid tumors. In order to explore the transcriptomic changes induced by rhIL-7-hyFc or a combination of rhIL-7-hyFc and TCE treatment at the clonal level, we performed scRNA/TCR-seq.

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Sensitizing Resistant Cancer Cells to T cell-secreted Cytokines

Project description:Tumor heterogeneity is a major barrier to cancer therapy, including immunotherapy. Activated T cells can efficiently kill tumor cells following recognition of MHC class I (MHC-I) bound peptides, but this selection pressure favors outgrowth of MHC-I deficient tumor cells. We performed a genome-scale screen to discover alternative pathways for T cell-mediated killing of MHC-I deficient tumor cells. Autophagy and TNF signaling emerged as top pathways, and inactivation of Rnf31 (TNF signaling) and Atg5 (autophagy) sensitized MHC-I deficient tumor cells to apoptosis by T cell-derived cytokines. Mechanistic studies demonstrated that inhibition of autophagy amplified pro-apoptotic effects of cytokines in tumor cells. Antigens from apoptotic MHC-I deficient tumor cells were efficiently cross-presented by dendritic cells, resulting in heightened tumor infiltration by IFNg and TNFa-producing T cells. Tumors with a substantial population of MHC-I deficient cancer cells could be controlled by T cells when both pathways were targeted using genetic or pharmacological approaches.

2022-09-13 | GSE213078 | GEO

MEK inhibition enhances presentation of targetable MHC-I tumor antigens in mutant melanomas

Project description:Combining multiple therapeutic strategies in NRAS/BRAF mutant melanoma – namely MEK/BRAF kinase inhibitors, immune checkpoint inhibitors, and targeted immunotherapies – may offer an improved survival benefit by overcoming limitations associated with any individual therapy. Still, optimal combination, order, and timing of administration remains under investigation. Here, we measure how MEK inhibition alters anti-tumor immunity by utilizing quantitative immunopeptidomics to profile changes the peptide MHC (pMHC) repertoire. These data reveal a collection of tumor antigens whose presentation levels are selectively augmented following therapy, including several epitopes present at over 1000 copies-per-cell. We leveraged the tunable abundance of MEKi-modulated antigens by targeting 4 epitopes with pMHC-specific T cell engagers and antibody drug conjugates, enhancing cell killing in tumor cells following MEK inhibition. These results highlight drug treatment as a means to enhance immunotherapy efficacy by targeting specific upregulated pMHCs and provide a methodological framework for identifying, quantifying, and therapeutically targeting additional epitopes of interest.

2023-03-11 | PXD029860 | Pride

MEK inhibition enhances presentation of targetable MHC-I tumor antigens in mutant melanomas - targeted data

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Inhibition of the CtBP complex and FBXO11 enhances MHC class II expression and anti-cancer immune responses [RNA-Seq]

Project description:There is increasing recognition of the prognostic significance of tumor cell major histocompatibility complex (MHC) class II expression in anti-cancer immunity. Relapse of acute myeloid leukemia (AML) following allogeneic stem cell transplantation (alloSCT) has recently been linked to MHC class II silencing in leukemic blasts; however, the regulation of MHC class II expression remains incompletely understood. Utilizing unbiased CRISPR-Cas9 screens, we identify that the C-terminal binding protein (CtBP) complex transcriptionally represses MHC class II pathway genes, while the E3 ubiquitin ligase complex component FBXO11 mediates degradation of CIITA, the principal transcription factor regulating MHC class II expression. Targeting these repressive mechanisms selectively induces MHC class II upregulation across a range of AML cell lines. Functionally, MHC class II+ leukemic blasts stimulate antigen-dependent CD4+ T cell activation and potent anti-tumor immune responses, providing fundamental insights into the graft-versus-leukemia effect. These findings establish the rationale for therapeutic strategies aimed at restoring tumor-specific MHC class II expression to salvage AML relapse post-alloSCT and also potentially to enhance immunotherapy outcomes in non-myeloid malignancies.

2022-10-02 | GSE189772 | GEO

Inhibition of the CtBP complex and FBXO11 enhances MHC class II expression and anti-cancer immune responses [Epigenetic CRISPRscreen]

2022-10-02 | GSE189767 | GEO

Inhibition of the CtBP complex and FBXO11 enhances MHC class II expression and anti-cancer immune responses [CUT&TAG]

2022-10-02 | GSE189771 | GEO

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2022-10-02 | GSE189769 | GEO

Dietary suppression of MHC-II expression in intestinal epithelial cells enhances intestinal tumorigenesis

Project description:Little is known about how interactions between diet, intestinal stem cells (ISCs) and immune cells impact the early steps of intestinal tumorigenesis. Here, we show that a high fat diet (HFD) reduces the expression of the major histocompatibility complex II (MHC-II) genes in intestinal epithelial cells including ISCs. This decline in epithelial MHC-II expression in a HFD correlates with reduced diversity of the intestinal microbiome and is recapitulated in antibiotic treated and germ-free mice on a control diet. Mechanistically, pattern recognition receptor (PRR) and IFN g signaling regulate epithelial MHC-II expression where genetic ablation of these signaling pathways dampen MHC-II epithelial expression. Interestingly, upon loss of the tumor suppressor gene Apc in a HFD, MHC-II- ISCs harbor greater in vivo tumor-initiating capacity than their MHC-II+ counterparts when transplanted into immune-component hosts but not immune-deficient hosts, thus implicating a role for epithelial MHC-II-mediated immune surveillance in suppressing tumorigenesis. Finally, ISC-specific genetic ablation of MHC-II in engineered Apc-mediated intestinal tumor models increases tumor burden in a cell autonomous manner. These findings highlight how a HFD perturbs a microbiome – stem cell – immune cell crosstalk in the intestine and contributes to tumor initiation through the dampening of MHC-II expression in pre-malignant ISCs.

2021-08-16 | GSE180949 | GEO

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