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Histone demethylase KDM6B regulates 1,25-dihydroxyvitamin D3-induced senescence in glioma cells.
Journal of Cellular Physiology 2019 March 2
Vitamin D is a fat-soluble vitamin and plays an important role in calcium absorption and bone development, whose lack can cause a variety of diseases, including cancer. Human epidemiological studies suggested that vitamin D3 deficiency might increase glioma incidence, but molecular mechanism is less understood. In this study, we show that 1,25-dihydroxyvitamin D3 (the active form of vitamin D3) induces senescence of glioma cells and increases the expression of senescence markers, INK4A and cyclin-dependent kinase inhibitor 1A (CDKN1A). 1,25-Dihydroxyvitamin D3 also upregulates the expression of histone demethylase, KDM6B. Knockdown of KDM6B attenuates 1,25-dihydroxyvitamin D3-induced senescence and upregulation of INK4A and CDKN1A. KDM6B promotes the transcription of INK4A by eliminating the trimethylation of repressive marker H3K27me3 near its promoter. This study reveals a new regulatory mechanism involved in vitamin D3 inhibition on gliomas, which is beneficial to prevention and adjuvant therapy of glioma.
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