EZH2 INHIBITION ENHANCES T CELL IMMUNOTHERAPIES BY INDUCING LYMPHOMA IMMUNOGENICITY AND IMPROVING T CELL FUNCTION (WGS)
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PROVIDER: PRJNA1088535 | ENA |
REPOSITORIES: ENA
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Project description:EZH2 INHIBITION ENHANCES T CELL IMMUNOTHERAPIES BY INDUCING LYMPHOMA IMMUNOGENICITY AND IMPROVING T CELL FUNCTION
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Project description:EZH2 INHIBITION ENHANCES T CELL IMMUNOTHERAPIES BY INDUCING LYMPHOMA IMMUNOGENICITY AND IMPROVING T CELL FUNCTION (RNA-Seq)
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Project description:EZH2 INHIBITION ENHANCES T CELL IMMUNOTHERAPIES BY INDUCING LYMPHOMA IMMUNOGENICITY AND IMPROVING T CELL FUNCTION (CUT&RUN)
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Project description:While T cell immunotherapies have demonstrated effectiveness in a subset of patients with diffuse large B cell lymphoma (DLBCL) and follicular lymphoma (FL), they are currently administered without guidance regarding whether the underlying biology or immunology is conducive to a durable response. Moreover, mechanisms explaining CAR-T resistance in B cell lymphomas remain largely unknown, and suitable systems to study lymphomas are currently unavailable, making it infeasible. To address these unmet needs, we developed syngeneic animal models reflecting the genetics, epigenetics, and immunology of human FL and DLBCL. We show that treatment of these models with EZH2 inhibitors reprogrammed them to re-express T cell engagement genes and rendered them highly immunogenic. Notably, EZH2 inhibitors did not exhibit deleterious effects on T cells. Instead, they promoted a memory CAR CD8 phenotype and reduced exhaustion, resulting in a superior elimination of lymphoma B cells and decreased tumor burden. Intravital 2-photon imaging of transformed FL bearing mice showed that EZH2 inhibition increased the recruitment of CAR-T into the tumor microenvironment and enhanced the quality of interactions with lymphoma cells, leading to increased killing. Therefore, inhibition of EZH2 enhances CAR-T cell activity through direct effects on CAR-T cells, in addition to rendering lymphoma B cells immunogenic. This offers an innovative approach for enhancing the prognosis of patients with refractory B cell lymphomas, and is currently under evaluation in a clinical trial (NCT05934838)
2025-01-10 | GSE261745 | GEO
Project description:While T cell immunotherapies have demonstrated effectiveness in a subset of patients with diffuse large B cell lymphoma (DLBCL) and follicular lymphoma (FL), they are currently administered without guidance regarding whether the underlying biology or immunology is conducive to a durable response. Moreover, mechanisms explaining CAR-T resistance in B cell lymphomas remain largely unknown, and suitable systems to study lymphomas are currently unavailable, making it infeasible. To address these unmet needs, we developed syngeneic animal models reflecting the genetics, epigenetics, and immunology of human FL and DLBCL. We show that treatment of these models with EZH2 inhibitors reprogrammed them to re-express T cell engagement genes and rendered them highly immunogenic. Notably, EZH2 inhibitors did not exhibit deleterious effects on T cells. Instead, they promoted a memory CAR CD8 phenotype and reduced exhaustion, resulting in a superior elimination of lymphoma B cells and decreased tumor burden. Intravital 2-photon imaging of transformed FL bearing mice showed that EZH2 inhibition increased the recruitment of CAR-T into the tumor microenvironment and enhanced the quality of interactions with lymphoma cells, leading to increased killing. Therefore, inhibition of EZH2 enhances CAR-T cell activity through direct effects on CAR-T cells, in addition to rendering lymphoma B cells immunogenic. This offers an innovative approach for enhancing the prognosis of patients with refractory B cell lymphomas, and is currently under evaluation in a clinical trial (NCT05934838)
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Project description:While T cell immunotherapies have demonstrated effectiveness in a subset of patients with diffuse large B cell lymphoma (DLBCL) and follicular lymphoma (FL), they are currently administered without guidance regarding whether the underlying biology or immunology is conducive to a durable response. Moreover, mechanisms explaining CAR-T resistance in B cell lymphomas remain largely unknown, and suitable systems to study lymphomas are currently unavailable, making it infeasible. To address these unmet needs, we developed syngeneic animal models reflecting the genetics, epigenetics, and immunology of human FL and DLBCL. We show that treatment of these models with EZH2 inhibitors reprogrammed them to re-express T cell engagement genes and rendered them highly immunogenic. Notably, EZH2 inhibitors did not exhibit deleterious effects on T cells. Instead, they promoted a memory CAR CD8 phenotype and reduced exhaustion, resulting in a superior elimination of lymphoma B cells and decreased tumor burden. Intravital 2-photon imaging of transformed FL bearing mice showed that EZH2 inhibition increased the recruitment of CAR-T into the tumor microenvironment and enhanced the quality of interactions with lymphoma cells, leading to increased killing. Therefore, inhibition of EZH2 enhances CAR-T cell activity through direct effects on CAR-T cells, in addition to rendering lymphoma B cells immunogenic. This offers an innovative approach for enhancing the prognosis of patients with refractory B cell lymphomas, and is currently under evaluation in a clinical trial (NCT05934838)
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2014-03-01 | E-MTAB-2164 | biostudies-arrayexpress
Project description:Immune evasion is an important hallmark of cancer ensured by diverse strategies, including immunosuppression and downregulation of antigen presentation. Here, to restore immunogenicity of cancer cells, we employed the minimal gene regulatory network of highly immunogenic type 1 conventional dendritic cells (cDC1) to reprogram cancer cells into professional antigen presenting cells (APCs). We showed that enforced expression of PU.1, IRF8 and BATF3 (PIB) was sufficient to induce cDC1 phenotype in 33 cell lines derived from human and mouse hematological and solid tumors. PIB gradually modified the cancer cell transcriptional and epigenetic program imposing global antigen presentation and cDC1 gene signatures within 9 days. cDC1 reprogramming restored the expression of antigen presentation complexes as well as co-stimulatory molecules at the cell surface, leading to the presentation of endogenous antigens on MHC-I, and to CD8+ T cell mediated killing. Functionally, tumor- APCs acquired the ability to uptake and process exogenous proteins and dead cells, secreted inflammatory cytokines and cross-presented antigens to naïve CD8+ T cells. Importantly, tumor-APCs were efficiently generated at the single cell level from primary cancer cells of 7 solid tumors that presented antigens to memory and naïve T-cells, as well as to activated patient-specific intra-tumoral lymphocytes. Alongside antigen presentation, tumor-APCs harboring TP53, KRAS and PTEN mutations showed impaired tumorigenicity in vitro and in vivo. Finally, using in vivo mouse models of melanoma, we showed that intra-tumoral injection of tumor-APCs promoted lymphoid infiltration, delayed tumor growth and increased survival. The anti-tumor immunity elicited by tumor-APCs was synergistic with immune checkpoint inhibitors enabling tumor eradication. Our approach combines cDC1’s antigen processing and presenting abilities with endogenous generation of tumor antigens and serves as a platform for the development of novel immunotherapies based on endowed antigen presentation in cancer cells.
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Project description:Restoring Tumor Immunogenicity with Dendritic Cell Reprogramming
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