Cathepsin B and D drive the fibrogenic potential of pancreatic stellate cells and modulate the stromal compartment in pancreatic ductal adenocarcinoma (PDAC)
Zeitschrift Fur Gastroenterologie(2014)
摘要
TGFβ1 is considered to be required for peripheral maintenance of CD4+CD25+FOXP3+ Treg cells. However, we demonstrate no reduction in the percentage of such T cells in the spleens and thymi of Tgfb1−/− mice. Although putative Treg cells, characterized as CD4+CD25+FOXP3+CD62L+ T cells, are increased in Tgfb1−/− mice, they may be inadequate to control activated T cells since the ratio of activated T cells:putative Treg cells is several-fold higher in Tgfb1−/− mice than in control mice. We further show that whereas Tgfb1−/− mice that express a chicken OVA-specific TCR transgene (DO11.10) have an increase in putative Treg cells, there are no detectable CD4+CD25+ T cells in the spleens of DO11.10 Rag1−/− mice suggesting that Treg-cell generation is self-antigen dependent regardless of whether they express Tgfb1. Finally, we demonstrate that Tgfb1−/− T cells remain responsive to the suppressive effect of TGFβ1 in vitro. These data suggest that TGFβ1 is required for the regulatory function of Treg cells to prevent activation of T cells and autoimmunity.
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关键词
pancreatic stellate cells,pancreatic ductal adenocarcinoma,fibrogenic potential
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