Vitamin D directly regulates Mdm2 gene expression in osteoblasts.

Vitamin D directly regulates Mdm2 gene expression in osteoblasts.
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DOI:
10.1016/j.bbrc.2012.11.003
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发表时间:
2013-01-04
影响因子:
3.1
通讯作者:
Chandar, Nalini
Chandar, Nalini
中科院分区:
生物学4区
文献类型:
--
作者:
Chen, Hankui;Reed, Grant;Guardia, Janete;Lakhan, Sandeep;Couture, Oliver;Hays, Emily;Chandar, Nalini

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虽然Mdm 2是p53肿瘤抑制因子的重要负调节因子,但它在细胞分化过程中也具有p53非依赖性功能。Mdm 2的表达受两个P1和P2启动子交替调控。在这项研究中,我们表明,P2启动的Mdm 2基因的转录被激活的1,25-二羟基维生素D3在MC 3 T3细胞。通过使用P1和P2特异性报告,我们证明,只有P2启动子响应维生素D治疗。我们已经进一步确定了一个潜在的维生素D受体响应元件Mdm 2 P2启动子内的两个p53响应元件附近。使用p53-温度敏感和p53-null的细胞系,我们显示VDR介导的Mdm 2表达上调需要p53。我们的研究结果表明,1,25二羟基维生素D3及其受体在P2启动的Mdm 2基因表达的调节中发挥作用,在p53依赖的方式。
While Mdm2 is an important negative regulator of the p53 tumor suppressor, it also possesses p53-independent functions in cellular differentiation processes. Mdm2 expression is alternatively regulated by two P1 and P2 promoters. In this study we show that the P2-intiated transcription of Mdm2 gene is activated by 1,25-dihydroxy vitamin D3 in MC3T3 cells. By using P1 and P2-specific reporters, we demonstrate that only the P2-promoter responds to vitamin D treatment. We have further identified a potential vitamin D receptor responsive element proximal to the two p53 response elements within the Mdm2 P2 promoter. Using cell lines that are p53-temperature sensitive and p53-null, we show requirement of p53 for VDR-mediated up regulation of Mdm2 expression. Our results indicate that 1,25 dihydroxy vitamin D3 and its receptor have a role in the regulation of P2-initiated Mdm2 gene expression in a p53-dependent way.
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