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Abstract
We provide evidence that human and murine Schlafen 5 (SLFN5) proteins are modulators of type I IFN responses and the immune response in pancreatic ductal adenocarcinoma (PDAC). Blocking expression of Slfn5 in PDAC enhanced IFN responses, suppressed tumor growth, and prolonged survival in immunocompetent mice. Notably, immunophenotypic analysis revealed a reduction in tumor-associated macrophages alongside an increase in tumor-infiltrating effector cells in tumors over time. These findings suggest SLFN5 acts as an intracellular immune checkpoint and identify it as a unique therapeutic target for the development of therapies for PDAC and possibly other malignancies.
Authors
Mariafausta Fischietti, Markella Zannikou, Elspeth M. Beauchamp, Diana Saleiro, Aneta H. Baran, Briana N. Hryhorysak, Jamie N. Guillen Magaña, Emely Lopez Fajardo, Gavin T. Blyth, Brandyn A. Castro, Jason M. Miska, Catalina Lee-Chang, Priyam Patel, Elizabeth T. Bartom, Masha Kocherginsky, Frank Eckerdt, Leonidas C. Platanias
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