| First Author | Jiang YJ | Year | 2013 |
| Journal | J Steroid Biochem Mol Biol | Volume | 136 |
| Pages | 229-32 | PubMed ID | 23026511 |
| Mgi Jnum | J:198987 | Mgi Id | MGI:5499976 |
| Doi | 10.1016/j.jsbmb.2012.09.024 | Citation | Jiang YJ, et al. (2013) 1alpha,25(OH)2-Dihydroxyvitamin D3/VDR protects the skin from UVB-induced tumor formation by interacting with the beta-catenin pathway. J Steroid Biochem Mol Biol 136:229-32 |
| abstractText | Ultra violet (UV) irradiation, in particular UVB, is the single most important carcinogen for skin tumor formation. UVB induces genetic mutations and immune suppression, which lead to abnormal cell proliferation and eventually tumor formation. Previously studies from our group and others demonstrated that both global and epidermal specific VDR knock out mice are predisposed to either chemical (DMBA)- or long-term UVB-induced skin tumor formation, paralleled by an increase in beta-catenin signaling. Using primary cultured human keratinocytes, we further demonstrated that 1,25(OH)2-dihydroxyvitamin D3 (1,25(OH)2D3) suppresses cyclin D1 and Gli1 which are regulated by beta-catenin/TCF signaling and have a critical role in epidermal carcinogenesis. Blockage of VDR by siRNA resulted in hyperproliferation of keratinocytes, and increased expression of cyclin D1 and Gli1. In addition, we also showed that 1,25(OH)2D3/VDR directly regulates transcriptional activity of beta-catenin/TCF signaling using the -catenin reporter TopGlow. Using K14 driven tamoxifen-induced cre recombinase to delete both VDR and beta-catenin in keratinocytes of mice following the first hair follicle cycle, we found that ablation of epidermal specific beta-catenin cannot rescue VDR null mice from UVB-induced skin tumor formation. Further study using VDR or beta-catenin single null mice is necessary to compare with the data from double null mice. This article is part of a Special Issue entitled 'Vitamin D Workshop'. |
