ArticleBMC medicine2026
Next-generation of mesothelin-targeted CAR-T cells secreting anti-PD-L1 scFv for potent immunotherapy against 3D patient-derived colorectal cancer organoids.
Article in BMC medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundChimeric antigen receptor (CAR)-T cell therapies have revolutionized the landscape of cancer treatment, particularly in hematological malignancies. However, their successful translation to solid tumors remains limited by several barriers, including immunosuppressive tumor microenvironment and on-target/off-tumor toxicity. One promising strategy to enhance efficacy of CAR-T cells is the rational selection of tumor-specific antigens coupled with engineering strategies that incorporate localized immune modulation, such as CAR-T cells secreting immune checkpoint-blocking anti-PD-L1 scFv.
methodsTo better model therapeutic responses, we established a dynamic real-time autologous co-culture platform integrating colorectal cancer (CRC) patient-derived organoids (PDOs) and CAR-T cells to assess infiltration, persistence, and cytotoxicity ex vivo. Although early clinical trials of mesothelin (MSLN)-directed CAR-T cells have demonstrated high safety, their anti-tumor efficacy remains modest, highlighting the need for improved constructs. Therefore, we engineered anti-MSLN-CAR4-T cells using fully human anti-MSLN scFv linked to a triple costimulatory backbone (CD28, 4-1BB, and CD27) fused to CD3ζ, and anti-MSLN-CAR5-T cells, incorporating an additional anti-PD-L1 scFv.
resultsBoth CAR4- and CAR5-T cells exhibited comparable cytotoxic efficacy against MSLN
conclusionsFinally, our 14-day ex vivo CRC-PDOs/CAR-T platform provides a promising rapid and translational tool for tumor-associated antigen validation, streamlined PDO isolation, autologous CAR-T cytotoxicity testing, and personalized immunotherapy optimization in solid tumors.
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