Project description:KRAS-mutant pancreatic ductal adenocarcinoma (PDAC) is highly immunosuppressive and resistant to targeted therapies, immune checkpoint blockade and engineered T cells. In this study, we performed a systematic high throughput combinatorial drug screen and identified a synergistic interaction between the MEK inhibitor trametinib and the multi-kinase inhibitor nintedanib. Using bulk and single-cell RNA sequencing and immunophenotyping, we show that the combination therapy reprograms the immunosuppressive microenvironment and primes cytotoxic and memory T cells to infiltrate the tumors, thereby sensitizing mesenchymal PDAC to PD-L1 inhibition.
Project description:KRAS-mutant pancreatic ductal adenocarcinoma (PDAC) is highly immunosuppressive and resistant to targeted therapies, immune checkpoint blockade and engineered T cells. In this study, we performed a systematic high throughput combinatorial drug screen and identified a synergistic interaction between the MEK inhibitor trametinib and the multi- kinase inhibitor nintedanib. Using single cell RNA sequencing and immunophenotyping, we show that the combination therapy reprograms the immunosuppressive microenvironment and primes cytotoxic and memory T cells to infiltrate the tumors, thereby sensitizing mesenchymal PDAC to PD-L1 inhibition.
Project description:IL-2/IL-15/IL-21-expanded TILs achieved complete tumor regression in a hypermutated glioblastoma patient, overcoming the immunosuppressive microenvironment. This case highlights a novel approach for treating gliomas using tailored adoptive cell therapy strategies.
Project description:IL-2/IL-15/IL-21-expanded TILs achieved complete tumor regression in a hypermutated glioblastoma patient, overcoming the immunosuppressive microenvironment. This case highlights a novel approach for treating gliomas using tailored adoptive cell therapy strategies.
Project description:IL-2/IL-15/IL-21-expanded TILs achieved complete tumor regression in a hypermutated glioblastoma patient, overcoming the immunosuppressive microenvironment. This case highlights a novel approach for treating gliomas using tailored adoptive cell therapy strategies.
Project description:KRAS-mutant pancreatic ductal adenocarcinoma (PDAC) is highly immunosuppressive and resistant to targeted therapies, immune checkpoint blockade and engineered T cells. Here, we performed a systematic high throughput combinatorial drug screen and identified a synergistic interaction between the MEK inhibitor trametinib and the multi-kinase inhibitor nintedanib. This interaction targets KRAS-directed oncogenic signaling in the aggressive and therapy resistant non-glandular mesenchymal subtype of PDAC, driven by an allelic imbalance, increased gene-dosage and expression of oncogenic KRAS. Mechanistically, the combinatorial treatment induces cell cycle arrest and cell death and initiates an interferon response. Using single cell RNA sequencing and immunophenotyping, we show that the combination therapy reprograms the immunosuppressive microenvironment and primes cytotoxic and memory T cells to infiltrate the tumors, thereby sensitizing mesenchymal PDAC to PD-L1 inhibition. This work opens new avenues to target the therapy refractory mesenchymal PDAC subtype.
Project description:KRAS-mutant pancreatic ductal adenocarcinoma (PDAC) is highly immunosuppressive and resistant to targeted therapies, immune checkpoint blockade and engineered T cells. Here, we performed a systematic high throughput combinatorial drug screen and identified a synergistic interaction between the MEK inhibitor trametinib and the multi-kinase inhibitor nintedanib. This interaction targets KRAS-directed oncogenic signaling in the aggressive and therapy resistant non-glandular mesenchymal subtype of PDAC, driven by an allelic imbalance, increased gene-dosage and expression of oncogenic KRAS. Mechanistically, the combinatorial treatment induces cell cycle arrest and cell death and initiates an interferon response. Using single cell RNA sequencing and immunophenotyping, we show that the combination therapy reprograms the immunosuppressive microenvironment and primes cytotoxic and memory T cells to infiltrate the tumors, thereby sensitizing mesenchymal PDAC to PD-L1 inhibition. This work opens new avenues to target the therapy refractory mesenchymal PDAC subtype.
Project description:Glioblastoma (GBM) is a malignancy with a complex tumour microenvironment (TME) dominated by glioblastoma stem cells (GSCs) and infiltrated by tumour-associated macrophages (TAMs), and exhibits aberrant metabolic pathways. Lactate is a critical glycolytic metabolite that promotes tumour progression; however, the mechanisms of lactate transport and lactylation in the TME of GBM remain elusive. Here we show that lactate is transported from TAMs to GSCs via MCT4/MCT1. TAMs provide lactate to GSCs, promoting GSC proliferation and inducing lactylation of the non-homologous end joining (NHEJ) protein KU70 at lysine 317 (K317), which inhibits cGAS-STING signaling and remodels the immunosuppressive TME. Inhibition of lactate transport or targeting the lactylation of KU70, in combination with the immune checkpoint blockade, demonstrates additive therapeutic benefits in immunocompetent xenograft models. This study unveils TAM-derived lactate and lactylation as critical regulators in GSCs to enforce an immunosuppressive microenvironment, opening avenues for developing combinatorial therapy for GBM.
