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Hif1? deletion reveals pro-neoplastic function of B cells in pancreatic neoplasia #MMPMID26715642
Lee K; Spata M; Bayne LJ; Buza EL; Durham AC; Allman D; Vonderheide RH; Simon MC
Cancer Discov 2016[Mar]; 6 (3): 256-69 PMID26715642show ga
Pancreatic ductal adenocarcinoma (PDAC) is a leading cause of cancer-related deaths worldwide, with an exceedingly low 5-year survival rate. PDAC tumors are characterized by an extensive desmoplastic stromal response and hypovascularity, suggesting that tumor hypoxia could regulate PDAC initiation and/or progression. Using a well-defined, autochthonous KrasG12D-driven murine model, as well as human tumors, we demonstrate that hypoxia and stabilization of hypoxia-inducible factor 1? (HIF1?), a principal mediator of hypoxic adaptation, emerge early during preinvasive stages of PDAC. Surprisingly, pancreas-specific Hif1? deletion drastically accelerated KrasG12D-driven pancreatic neoplasia, and was accompanied by significant increases in intrapancreatic B lymphocytes, featuring prominent influx of a rare ?B1b? B cell subtype. Finally, treatment of HIF1?-deficient mice with B cell-depleting ?CD20 monoclonal antibodies inhibited progression of pancreatic intraepithelial neoplasia (PanIN). Our data reveal a previously unrecognized role for B cells in promoting pancreatic tumorigenesis, and implicate HIF1? as a critical regulator of PDAC development.