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Neme, Antonio; Seuter, Sabine; Malinen, Marjo; Nurmi, Tarja; Tuomainen, Tomi-Pekka; Virtanen, Jyrki K.; Carlberg, Carsten
The Journal of steroid biochemistry and molecular biology, 04/2019, Volume: 188Journal Article
•In human PBMCs 702 genes are significantly (p < 005) affected by a vitamin D3 bolus.•These genes are involved in general protein translation, monocyte differentiation and cellular growth control.•The expression pattern of vitamin D target genes differed significantly between individuals. In the vitamin D intervention study VitDbol (NCT02063334) blood samples were drawn directly before an oral bolus (2000 μg vitamin D3) and 24 h later. The focus of phase II of VitDbol was the transcriptome-wide analysis of the effects of vitamin D gene expression in human peripheral blood mononuclear cells (PBMCs). All five participants responded in an individual fashion to the bolus by increases in serum levels of the vitamin D metabolites 25-hydroxyvitamin D3 (25(OH)D3) and 1α,25-dihydroxyvitamin D3 (1,25(OH)2D3). RNA sequencing identified 15.040 commonly expressed genes in PBMCs, 702 (4,7%) of which were significantly (p < 0,05) affected by the vitamin D3 bolus. KEGG pathway analysis suggested that these genes are involved in general protein translation, monocyte differentiation and cellular growth control. Previously published transcriptome-wide studies in comparable cell systems confirmed 234 of the 702 vitamin D target genes, leaving many genes, such as HLA-A and HLA-C, as novel discoveries. Interestingly, in vivo stimulated PBMCs of this study showed a larger number of common vitamin D target genes with the monocytic cell line THP-1 than with in vitro stimulated PBMCs. The expression pattern of vitamin D target genes differed significantly between individuals and the average expression change can serve as a marker for vitamin D responsiveness. In conclusion, this study demonstrates that under in vivo conditions changes in 25(OH)D3 and 1,25(OH)2D3 serum concentrations alter the expression of more than 700 vitamin D target genes in human leukocytes.
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