MicroRNA-22 is induced by vitamin D and contributes to its antiproliferative, antimigratory and gene regulatory effects in colon cancer cells

Human Molecular Genetics
Silvia Alvarez-DíazAlberto Muñoz

Abstract

Vitamin D deficiency is associated with the high risk of colon cancer and a variety of other diseases. The active vitamin D metabolite 1α,25-dihydroxyvitamin D(3) (1,25(OH)(2)D(3)) regulates gene transcription via its nuclear receptor (VDR), and posttranscriptional regulatory mechanisms of gene expression have also been proposed. We have identified microRNA-22 (miR-22) and several other miRNA species as 1,25(OH)(2)D(3) targets in human colon cancer cells. Remarkably, miR-22 is induced by 1,25(OH)(2)D(3) in a time-, dose- and VDR-dependent manner. In SW480-ADH and HCT116 cells, miR-22 loss-of-function by transfection of a miR-22 inhibitor suppresses the antiproliferative effect of 1,25(OH)(2)D(3). Additionally, miR-22 inhibition increases cell migration per se and decreases the antimigratory effect of 1,25(OH)(2)D(3) in both cell types. In silico analysis shows a significant overlap between genes suppressed by 1,25(OH)(2)D(3) and miR-22 putative target genes. Consistently, miR-22 inhibition abrogates the 1,25(OH)(2)D(3)-mediated suppression of NELL2, OGN, HNRPH1, RERE and NFAT5 genes. In 39 out of 50 (78%) human colon cancer patients, miR-22 expression was found lower in the tumour than in the matched normal tissue and correlate...Continue Reading

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