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• W4282973141 abstract "Abstract Targeting solid tumors with CAR T cells has proven to be more difficult due to their heterogenous target antigen expression, antigen escape, and due to their hostile tumor microenvironment (TME). Mesothelin represents a promising surface tumor antigen, since it has been associated with tumor invasion and is highly expressed on various cancer types, including pancreatic adenocarcinoma. As clinical trials of mesothelin targeting CAR have yet to show efficacy, we hypothesized that tumor stromal cells such as cancer-associated fibroblasts (CAFs) may play a role in this resistance. To provide a more favorable TME for CAR T cells, we generated a bicistronic lentiviral vector encoding a mesothelin CAR along with a secreted T cell engaging molecule (TEAM) that targets fibroblast activation protein (FAP), which is expressed by CAFs. We termed our constructs CARTEAM, and in this case, mesoFAP. We have assessed the activation and proliferative capacity of these CARTEAM through in vitro assays. We showed that TEAMs secreted by CAR T cells bind their appropriate target antigen by adding supernatant from CARTEAM to target cells expressing FAP. In a co-culture assay using a transwell system we demonstrated the cytotoxic effect of secreted TEAM interacting and recruiting bystander T cells against CAFs. In a real-time cell analysis (RTCA) co-culture assay with a pancreatic cancer cell line (AsPC1) and FAP expressing CAFs, we showed cell death of AsPC1 upon CAR recognition and cell death of CAFs through TEAM-mediated recruitment of bystander T cells and CART cells. We show in these co-culture systems, mimicking tumor and TME, that our CARTEAM construct is superior in the elimination of both cancer cell line and CAF, in comparison to control constructs, including mesothelin targeting CAR T cells (meso CAR) and meso CAR T cells secreting an unspecific CD19 TEAM (mesoCD19). We also used acoustic force microscopy to evaluate the additive effect of the TEAM molecule secreted to binding to tumor cells by mesothelin CAR T cells. In vivo experiments of subcutaneously injected tumor cells admixed with CAFs, show superior tumor control when treated with CARTEAM in comparison to control constructs. Based on these data, we demonstrate both the effective in vitro elimination of CAFs and pancreatic cancer cells through the application of CARTEAM and control of pancreatic tumor growth in vivo. Our studies provide a deeper insight into a dual targeting strategy using a novel CAR T cell secreting a TEAM against pancreatic cancer and its tumor microenvironment. Citation Format: Marc Wehrli, Adam Kuo, Rebecca Larson, Irene Scarfò, Amanda Bouffard, Korneel Grauwet, Mark Leick, Andrea Schmidts, Stefanie Bailey, Tamina Kienka, Michael Kann, Sonika Vatsa, Harrison Silva, Kathleen Gallagher, Max Jan, Bryan Choi, David Ting, Marcela Maus. Mesothelin CAR T cells secreting FAP specific T cell engaging molecule (TEAM) target pancreatic cancer and its tumor microenvironment (TME) [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr 569." @default.
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• W4282973141 date "2022-06-15" @default.
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• W4282973141 title "Abstract 569: Mesothelin CAR T cells secreting FAP specific T cell engaging molecule (TEAM) target pancreatic cancer and its tumor microenvironment (TME)" @default.
• W4282973141 doi "https://doi.org/10.1158/1538-7445.am2022-569" @default.
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