1α,25-Dihydroxyvitamin D3/VDR Protects the Skin from UVB-Induced Tumor Formation by Interacting with the β-Catenin Pathway

The study explored the protective role of 1α,25(OH)2-dihydroxyvitamin D3 (1,25(OH)2D3) and its receptor VDR against UVB-induced skin tumor formation, focusing on their interaction with the β-catenin pathway. It was found that VDR knockout mice were more susceptible to skin tumors, and this was associated with increased β-catenin signaling. The research demonstrated that 1,25(OH)2D3 suppresses key proteins involved in epidermal carcinogenesis, such as cyclin D1 and Gli1, which are regulated by β-catenin/TCF signaling. Blocking VDR led to hyperproliferation of keratinocytes and increased expression of these proteins. The study concluded that VDR might protect against UVB-induced skin cancer by interacting with the Wnt/β-catenin pathway, although further research was needed to fully understand the mechanisms involved.