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Regulatory T Cell Depletion Alters the Tumor Microenvironment and Accelerates Pancreatic Carcinogenesis.

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Regulatory T cells (Tregs) are abundant ion human and mouse pancreatic cancer. To understand the contribution to the immunosuppressive microenvironment, we depleted Tregs in a mouse model of pancreatic cancer. Contrary to our expectations, Treg depletion failed to relieve immunosuppression, and led to accelerated tumor progression.

We show that Tregs are a key source of TGFβ ligands and, accordingly, their depletion reprogramed the fibroblast population, with loss of tumor-restraining, smooth muscle actin-expressing fibroblasts (myCAFs).  Read more . . . 

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