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• W1991409650 abstract "The vitamin D system is deregulated during development and progression of several cancer types. Data on the expression of the vitamin D system in the diseased pancreas are missing. The aim of this study was to investigate the expression of the vitamin D receptor (VDR), 1,25-dihydroxyvitamin D3 24-hydroxylase (CYP24A1), and the calcium-sensing receptor (CaSR), a vitamin D target gene, in the different regions of the pancreas in patients with chronic pancreatitis (n = 6) and pancreatic ductal adenocarcinomas (PDAC) (n = 17). We analyzed the expression of these genes at mRNA and protein level with quantitative real-time RT-PCR and immunostaining. mRNA expression of CYP24A1 and VDR was significantly increased in tumors compared with the adjacent non-tumorous tissue (p < 0.01), while CaSR mRNA expression decreased. Both the VDR and the CaSR protein were highly expressed in the endocrine compared with the exocrine pancreas. In CP the CYP24A1 expression was highest in the endocrine pancreas, while in PDACs in the transformed ducts. In the PDAC patients CYP24A1 expression in the islets was significantly lower than in CP patients. Our data suggest that during ductal adenocarcinoma development the vitamin D system in the pancreas becomes deregulated on two levels: in the islets CYP24A1 expression decreases weakening the negative feedback regulation of the vitamin D-dependent insulin synthesis/secretion. In the transformed ducts CYP24A1 expression increases, impairing the antiproliferative effect of vitamin D in these cells." @default.
• W1991409650 created "2016-06-24" @default.
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• W1991409650 date "2014-10-01" @default.
• W1991409650 modified "2023-10-17" @default.
• W1991409650 title "The vitamin D system is deregulated in pancreatic diseases" @default.
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• W1991409650 doi "https://doi.org/10.1016/j.jsbmb.2014.07.011" @default.
• W1991409650 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4217145" @default.
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