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RNA-seq analysis of αPD-1 treatment outcomes in IL-34 expressing or not expressing CT26 cell line

ABSTRACT: Interleukin-34 (IL-34) is an alternative ligand to colony-stimulating factor-1 (CSF-1) for the CSF-1 receptor that acts as a key regulator of monocyte/macrophage lineage. In this study, we show that cancer cells-derived IL-34 mediates resistance to immune checkpoint blockade regardless of CSF-1 existence. In a therapeutic study of a programmed death-1 and cytotoxic T-lymphocyte-associated antigen-4 blocking monoclonal antibody, the expression of IL-34 in tumors was accompanied with limited benefits compared to IL-34 non-expressing tumors in various murine cancer models. Consistent with its immunosuppressive characteristics, the expression of IL-34 in tumors correlates with decreased frequencies of cellular (such as CD8+ and CD4+ T cells) and molecular (including various cytokines and chemokines) effectors at the tumor microenvironment. In addition, IL-34 blockade expands the M1-macrophage population. Then, a neutralizing antibody against IL-34 helped to reverse these effects and improved the therapeutic effects of the immune checkpoint blockade in combinatorial therapeutic models, including a patient-derived xenograft model of primary lung adenocarcinoma. Collectively, we revealed that tumor-derived IL-34 inhibits the efficacy of immune checkpoint blockade and proposed the utility of IL-34 blockade as a new strategy for cancer therapy.

ORGANISM(S): Mus musculus

PROVIDER: GSE157602 | GEO | 2020/09/30

REPOSITORIES: GEO

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Mus musculus

Project description:Dietary Lactobacillus-derived exopolysaccharide enhances immune checkpoint blockade therapy

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Microenvironment-driven IGF-1R/PI3K signaling underlies acquired resistance to CSF1R inhibition in gliomas (CGH)

Project description:Macrophages accumulate with glioblastoma multiforme (GBM) progression, and can be acutely targeted via inhibition of colony stimulating factor-1 receptor (CSF-1R) to regress high-grade tumors in animal models. However, whether and how resistance emerges in response to sustained CSF-1R blockade is unknown. Here, we investigate whether long-term CSF-1R inhibition can stably regress GBM in preclinical trials. We show that while overall survival is significantly prolonged, tumors recur eventually in >50% of mice. Upon isolation and transplantation of recurrent tumor cells into naïve animals, gliomas re-establish sensitivity to CSF-1R inhibition, indicating that resistance is microenvironment-driven. PI3K pathway activity was elevated in recurrent GBM, driven by macrophage-derived IGF-1 and tumor cell IGF-1R. Consequently, combining IGF-1R or PI3K blockade with continuous CSF-1R inhibition in recurrent tumors significantly prolonged overall survival. By contrast, monotherapy with IGF-1R or PI3K inhibitors in rebound or treatment-naïve tumors was less effective, indicating the necessity of combination therapy to expose PI3K signaling-dependency in recurrent disease. Our findings thus reveal a potential therapeutic approach for treating resistance to CSF-1R inhibitors in the clinical setting.

2016-05-20 | GSE80399 | GEO

Melanoma Sequential Immune Checkpoint Blockade Treatment Sequencing Study

Project description:<p>Blockade of T cell coinhibitory molecules such as CTLA-4 and PD-1, can activate T cell antitumor response. Although these immune checkpoint blockades (CTLA-4 blockade and PD-1 blockade) have shown durable response, response rate is modest. Therefore, there is a need to find stable biomarkers predictive of response to immune checkpoint blockades and to understand underlying resistance mechanisms. We collected longitudinal tumor biopsies from a cohort of metastatic melanoma patients treated with sequential immune checkpoint blockades and performed whole exome sequencing of this cohort. The comprehensive genomic characterization of tumors enabled identification of higher copy number loss burden as a resistance mechanism and clonal T cell repertoire as a predictive biomarker.</p>

| phs001425 | dbGaP

Immunologic and clinical activity to ICB combinations in DAPPER Leiomyosarcoma cohort

Project description:Non-inflamed (cold) tumors such as leiomyosarcoma (LMS) do not benefit from immune checkpoint blockade (ICB) monotherapy. Combining ICB with angiogenesis-, or poly-ADP ribose polymerase (PARP) inhibitors may increase tumor immunogenicity by altering the immune cell composition of the tumor microenvironment (TME). The DAPPER phase II study evaluated the safety, immunologic, and clinical activity of ICB-based combinations in pre-treated LMS patients.

2024-01-01 | E-MTAB-12922 | biostudies-arrayexpress

Intratumoral anti-CTLA-4 delivery by an oncolytic Vaccinia virotherapy virus elicits CD8+ T cell immunity and synergizes with anti-PD-1 to reject “cold” tumors

Project description:CTLA-4 is a clinically validated antibody target for cancer immunotherapy. Toxicity, which is linked to efficacy in available anti-CTLA-4 regimens has, however, restricted their use and precluded full therapeutic dosing. Here we describe and preclinically characterize a potentially safe and highly efficacious strategy to target CTLA-4. Intratumoral administration of an oncolytic Vaccinia virus, engineered to encode a novel Treg depleting, checkpoint-blocking, anti-CTLA-4 antibody and GM-CSF (VVGM-aCTLA4) achieved tumor-restricted CTLA-4 receptor saturation and Treg-depletion, and regressed diverse tumors spanning inflamed to immunologically ignorant microenvironments. Critically, intratumorally “ignited” antitumor immunity translated into stronger systemic expansion of tumor-specific CD8+ T cells compared with systemic anti-CTLA-4. In a clinically relevant mouse model resistant to systemic immune checkpoint blockade, i.t. VVGM-aCTLA4 synergized with anti-PD-1 to reject “cold” tumors. Based on our established proof-of-concept, a clinical trial evaluating i.t. VVGM-aCTLA4 (BT-001) alone and in combination with anti-PD-1 in metastatic or advanced solid tumors has commenced.

2022-02-08 | GSE176052 | GEO

Therapeutic targeting glutamine dependence in SWI/SNF-inactivated cancers

Project description:Alterations in components of the SWI/SNF chromatin-remodeling complex occur in ~20% of all human cancers. For example, ARID1A is mutated in up to 62% of clear cell ovarian carcinoma (OCCC), a disease currently lacking effective therapies. Here we show that ARID1A mutation creates a dependence on glutamine metabolism. SWI/SNF represses glutaminase I (GLS1) and ARID1A inactivation upregulates GLS1. ARID1A inactivation increases glutamine utilization and metabolism through the tricarboxylic acid cycle to support aspartate synthesis. Indeed, glutaminase inhibitor CB-839 suppresses the growth of ARID1A mutant, but not wildtype, OCCCs in both orthotopic and patient-derived xenografts. In addition, glutaminase inhibitor CB-839 synergizes with immune checkpoint blockade anti-PDL1 antibody in a genetic OCCC mouse model driven by conditional Arid1a inactivation. Our data indicate that pharmacological inhibition of glutaminase alone or in combination with immune checkpoint blockade represents a novel therapeutic strategy for cancers involving alterations in the SWI/SNF complex such as ARID1A mutations.

2020-10-21 | MSV000086347 | MassIVE

Pre-clinical models of genetically heterogeneous multiple myeloma reveal immune evasion mechanisms and predict clinical immunotherapy outcomes

Project description:The historical lack of pre-clinical models reflecting the genetic heterogeneity of multiple myeloma (MM) hampers advancing therapeutic discoveries. To circumvent this limitation, we have generated fifteen genetically diverse models that developed bone marrow tumors fulfilling MM pathogenesis. Transcriptomic analysis of tumor plasma cells revealed that MYC activation regulates time to progression. Bone marrow cell composition analysis classified myeloma tumors into immune-cold and inflamed categories, which condition immune checkpoint blockade responses in mouse multiple myeloma models.

2023-03-17 | GSE205644 | GEO

Ablation of cDC1 development by IL-6-induced C/EBPb support in the -165 kb Zeb2 enhancer

Project description:Type 1 conventional dendritic cells (cDC1) are required for effective CD8 T cell responses to many viruses and tumors and for effective checkpoint blockade immunotherapy. Recently, cytokines produced in association with certain tumors were reported to impair anti-tumor immune responses by reducing the abundance of cDC1. However, the reported mechanism of this reduction remains unclear, attributed either to reduced cDC1 development or decreased peripheral cDC1 survival. Here we show that tumor-derived IL-6 blocks cDC1 development from both in murine and human systems. We show that mechanism of this blockade is the IL-6-dependent increase in C/EBPβ expression in the common dendritic cell progenitor (CDP). C/EBPβ and NFIL3 compete for binding to sites in the -165 kb Zeb2 enhancer, and support or repress Zeb2 expression respectively. At homeostastis, pre-cDC1 specification occurs upon Nfil3 induction and consequent Zeb2 suppression. However, IL-6 strongly induces C/EBPβ expression in CDPs, thereby preventing normal NFIL3-dependent pre-cDC1 specification. Importantly, the ability of IL-6 to block cDC1 development is dependent on the presence of C/EBPβ binding sites in the -165 kb Zeb2 enhancer, as this effect is lost in Δ1+2+3 mutnat mice in which these binding sites are mutated. These results explain how tumor-associated IL-6 suppresses cDC1 development and suggest therapeutic approaches preventing abnormal C/EBPβ induction in CDPs may help reestablish cDC1 development to enhance anti-tumor immunity.

2023-06-22 | GSE215751 | GEO

Cell-autonomous Inflammation of BRCA1-deficient Ovarian Cancers Drives Intrinsic Immunoreactivity and Immune Resistance through STING and VEGF

Project description:BRCA1 loss leads to tumor cell transcriptional reprogramming, resulting in a DNA damage-driven, mandatory cell-autonomous type I IFN inflammatory activation mediated by STING and TREX1/2. PARP inhibition augmented this immunoreactivity, creating contextual lethality to dual immune checkpoint blockade (ICB) in vivo. BRCA1-deficient tumor can escape T-cell inflammation through targeted deletion or methylation of the DNA sensing/IFN pathway genes, such as STING, IFNB1 or the chemokine CCL5. Alternatively, BRCA-mutated carcinomas retaining immunoreactivity upregulate their VEGF-A expression driven by STING, which mediates immune resistance and tumor progression. STING elimination attenuated tumor growth and abrogated therapeutic resistance to dual ICB. VEGF-A blockade synergized with immune checkpoint blockade and/or PARP inhibition to control outgrowth of Brca1-/- ovarian tumors, offering opportunities for rational combination therapy of cancers with homologous recombination repair deficiency (HRD).

2021-06-16 | GSE162935 | GEO

Immune checkpoint blockade unleashes aberrant immune responses against the microbiota

Project description:Immune checkpoint inhibitors (ICIs) targeting PD-1 and CTLA-4 are essential components of the cancer therapeutic armamentarium. The remarkable responses seen with ICIs however, are also accompanied by immune-related adverse events (irAEs). These inflammatory side-effects impact virtually all organ systems, with the most common being the skin and gastrointestinal tract. Here, we establish a mouse model of commensal bacteria-driven skin irAEs and demonstrate that immune checkpoint blockade aberrantly unleashes commensal-specific T cell responses. Such responses caused widespread immune cell infiltration and inflammation throughout the skin, recapitulating the skin irAEs seen in patients treated with ICIs. This skin inflammation was dependent on production of the cytokine IL-17 by commensal-specific T cells, which in turn induced hyperactive responses from macrophages and myeloid cells. Importantly, these responses had long-term consequences, with commensal-specific T cells elicited in the context of ICIs being highly sensitive to re-activation by commensals months later. Together, our results establish a mouse model of skin irAEs and show that immune checkpoint blockade can potentiate aberrant immunity to skin commensals with long-lasting consequences.

2022-06-20 | GSE176030 | GEO

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