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Acquisition of suppressive function by CD4+ conventional T cells limits anti-tumor immunity driven by Treg depletion [scRNA-seq]

ABSTRACT: Regulatory T (Treg) cells are essential for immune homeostasis but inhibit immune rejection of cancer. Strategies to disrupt Treg-mediated cancer immunosuppression have been met with limited clinical success, but the underlying mechanisms for this failure are poorly understood. By modeling Treg-targeted immunotherapy in mice, we find that a subset of CD4+ Foxp3- conventional T (Tconv) cells with potent suppressive function undergoes activation and expansion upon depletion of Foxp3+ Treg cells and limits therapeutic efficacy. We noted that Foxp3- Tconv cells within tumors adopt a Treg-like transcriptional profile upon Treg depletion and acquire suppressive function. This is attributable to a Th2-like subset of CD4+ Tconv cells marked by expression of (C-C motif) receptor 8 (CCR8) and enriched in Treg-associated transcripts. CCR8+ Tconv cells are found in mouse and human tumors. Upon Treg depletion, CCR8+ Tconv cells undergo systemic and intratumoral activation and expansion, resulting in IL-10 dependent suppression of anti-tumor immunity. Consequently, conditional deletion of Il10 within T cells augments anti-tumor efficacy upon Treg-depletion in mice, and antibody blockade of IL-10 signaling synergizes with Treg depletion to overcome treatment resistance. These findings reveal a secondary layer of immunosuppression by Tconv cells released upon therapeutic Treg depletion and suggest that broader consideration of suppressive function within the T cell lineage is required for development of effective Treg-targeted therapies.

ORGANISM(S): Mus musculus

PROVIDER: GSE236824 | GEO | 2024/01/11

REPOSITORIES: GEO

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Acquisition of suppressive function by CD4+ conventional T cells limits anti-tumor immunity driven by Treg depletion [RNA-seq]

Project description:Regulatory T (Treg) cells are essential for immune homeostasis but inhibit immune rejection of cancer. Strategies to disrupt Treg-mediated cancer immunosuppression have been met with limited clinical success, but the underlying mechanisms for this failure are poorly understood. By modeling Treg-targeted immunotherapy in mice, we find that a subset of CD4+ Foxp3- conventional T (Tconv) cells with potent suppressive function undergoes activation and expansion upon depletion of Foxp3+ Treg cells and limits therapeutic efficacy. We noted that Foxp3- Tconv cells within tumors adopt a Treg-like transcriptional profile upon Treg depletion and acquire suppressive function. This is attributable to a Th2-like subset of CD4+ Tconv cells marked by expression of (C-C motif) receptor 8 (CCR8) and enriched in Treg-associated transcripts. CCR8+ Tconv cells are found in mouse and human tumors. Upon Treg depletion, CCR8+ Tconv cells undergo systemic and intratumoral activation and expansion, resulting in IL-10 dependent suppression of anti-tumor immunity. Consequently, conditional deletion of Il10 within T cells augments anti-tumor efficacy upon Treg-depletion in mice, and antibody blockade of IL-10 signaling synergizes with Treg depletion to overcome treatment resistance. These findings reveal a secondary layer of immunosuppression by Tconv cells released upon therapeutic Treg depletion and suggest that broader consideration of suppressive function within the T cell lineage is required for development of effective Treg-targeted therapies.

2024-01-11 | GSE236823 | GEO

Acquisition of suppressive function by CD4+ conventional T cells limits anti-tumor immunity driven by Treg depletion [RNA-seq II]

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proteomic profiling of small extracellular vesicles (EVs), released by chronic myeloid leukemia cells K562

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2019-09-02 | PXD011164 | Pride

Single cell RNA-seq analysis of the LLC-OVA tumor-infiltrating T-cell compartment.

Project description:Modulation and depletion of regulatory T cells (Tregs) constitute valid approaches in antitumor immunotherapy but suffer from severe adverse effects due to their lack of selectivity for the tumor-infiltrating (ti-)Treg population. We here employed single-cell RNA-sequencing to discern two ti-Treg populations, one of which is characterized by the unique expression of Ccr8 in conjunction with Treg activation markers. Ccr8 is also expressed by dysfunctional CD4+ and CD8+ T cells, but the CCR8 protein was only prominent on the highly activated and strongly T-cell suppressive ti-Treg subpopulation of mouse and human tumors, with no major CCR8-positivity found on peripheral Tregs. CCR8 expression resulted from TCR-mediated Treg triggering in an NF-kB-dependent fashion, but was not essential for the recruitment, activation nor suppressive capacity of these cells. We generated two CCR8-specific nanobodies (Nbs) that recognize distinct epitopes on the CCR8 extracellular domain. These Nbs were formulated as tetravalent Nb-Fc fusion proteins for optimal CCR8 binding and blocking, containing either an ADCC-deficient or an ADCC-prone Fc region. While treatment of tumor-bearing mice with a blocking ADCC-deficient Nb-Fc did not influence tumor growth, ADCC-prone Nb-Fc elicited antitumor immunity and reduced tumor growth in synergy with anti-PD-1 therapy. Importantly, ADCC-prone Nb-Fc specifically depleted ti-Tregs without affecting peripheral Tregs. Collectively, our findings highlight the efficacy and safety of targeting CCR8 for the depletion of tumor-promoting ti-Tregs in combination with anti-PD-1 therapy.

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2015-04-30 | E-GEOD-61834 | biostudies-arrayexpress

Characterizing T-cell immunopeptidomes

Project description:Imunopeptidomes promise novel surface markers as ideal targets for immunotherapies, but their characterization by mass spectrometry (MS) remains challenging. Until recently, cell numbers exceeding 1.0xE9 were needed for reasonably deep immunopeptidome surveys of at least 1,000 HLA ligands. Such limitation in analytical sensitivity necessarily constrains the types of clinical specimens that can evaluated. To evaluate the feasibility of immunopeptidome profiling from limiting cell amounts, primary purified human regulatory (Treg) and conventional T cells (Tconv) were compared, evaluating the relative immunopeptide recovery from T cells isolated from individual healthy donors (N=5) versus pools (N=2 pools from 13 donors). Two donors’ Tconv were subsequently stimulated with CD3/CD28 and IL-2 and compared to resting Tconv. The combined T-cell immunopeptide dataset reported here contains over 13,000 unique peptides derived from over 5,000 proteins. In comparison to protein expression, T cell immunopeptidomes revealed complementary aspects of T cell biology, while pointing to HLA ligands specific for distinct T cell subsets (e.g., FOXP3, CD5 and WNK1). Taken together, these findings have implications for understanding conditions required to induce therapeutic immune responses and may open up new avenues for tuning Treg suppressive functions to treat cancer.

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Project description:In human patients and in mouse models, immunosuppressive regulatory T cells(Tregs)accumulate in Pancreatic Intraepithelial Neoplasia (PanIN), the precursor lesions to pancreatic cancer. Tregs are considered a potential therapeutic target with the goal to reverse immunosuppression in a number of malignancies, including pancreatic cancer. Here, using a genetically engineered mouse that allows at will depletion of Tregs during pancreatic carcinogenesis, we determined that Treg depletion failed to relieve immunosuppression. Contradicting the current paradigm, depletion of Tregs led to accelerated tumorprogression. We demonstratedthat Treg depletion resultsin changes in the fibroblast population, exemplified by loss of Smooth Muscle Actinexpression and an increase the myeloid recruiting chemokines Ccl3, Ccl6, and Ccl8. Treg depletion further resulted ina compensatoryinflux of suppressive myeloid cells, thereby preventing an anti-tumor immune response. Mechanistically, we show that themyeloid recruitment was driven through the CCR1 axis, with the receptor expressed on tumor associated myeloid cells and several ligands up-regulated in epithelial cells and fibroblasts upon Treg depletion. Finally,blockade of CCR1 signalingcombined with Treg-depletionsuccessfully inhibitedtumorigenesis, uncovering the immune-suppressive myeloid CCR1 axis as a potential therapeutic targetin pancreatic cancer.

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