RIPK1 binds to vitamin D receptor and decreases vitamin D-induced growth suppression.

RIPK1 binds to vitamin D receptor and decreases vitamin D-induced growth suppression.
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DOI:
10.1016/j.jsbmb.2017.01.024
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发表时间:
2017-10
期刊:
The Journal of steroid biochemistry and molecular biology
影响因子:
--
通讯作者:
Bai W
Bai W
中科院分区:
其他
文献类型:
--
作者:
Quarni W;Lungchukiet P;Tse A;Wang P;Sun Y;Kasiappan R;Wu JY;Zhang X;Bai W

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受体相互作用蛋白激酶1(RIPK1)是一种作用于肿瘤坏死因子α下游的酶,控制细胞的存活和死亡。RIPK1的表达已被报道导致癌细胞耐药,但到目前为止,还没有发表的研究探讨RIPK1在维生素D信号转导中的作用。在本研究中,我们研究了RIPK1是否在1,25-二羟基维生素D3(1,25D3)诱导的生长抑制中发挥作用。在我们的研究中,在荧光素酶报告分析中,RIPK1降低了维生素D受体(VDR)的转录活性,而不是依赖于它的激酶活性,这表明RIPK1在1,25D3的作用中起负作用。RIPK1还与VDR形成复合体,缺失分析将RIPK1结合区映射到VDR的C末端配体结合域。亚细胞分级分析表明,RIPK1增加了VDR在细胞质中的滞留,这可能是其抑制VDR转录活性的原因。与报告分析一致的是,在RIPK1缺失的MEF和RIPK1基因敲除的卵巢癌细胞中,1,25D3诱导的生长抑制比对照细胞更明显。我们的研究将RIPK1定义为VDR抑制物,预测RIPK1缺失是增加1,25D3及其类似物对癌症干预的效力的潜在策略。
Receptor interacting protein kinase 1 (RIPK1) is an enzyme acting downstream of tumor necrosis factor alpha to control cell survival and death. RIPK1 expression has been reported to cause drug resistance in cancer cells, but so far, no published studies have investigated the role of RIPK1 in vitamin D signaling. In the present study, we investigated whether RIPK1 plays any roles in 1,25-dihydroxyvitamin D3 (1,25D3)-induced growth suppression. In our studies, RIPK1 decreased the transcriptional activity of vitamin D receptor (VDR) in luciferase reporter assays independent of its kinase activity, suggesting a negative role of RIPK1 in 1,25D3 action. RIPK1 also formed a complex with VDR, and deletion analyses mapped the RIPK1 binding region to the C-terminal ligand-binding domain of the VDR. Subcellular fractionation analyses indicated that RIPK1 increased VDR retention in the cytoplasm, which may account for its inhibition of VDR transcriptional activity. Consistent with the reporter analyses, 1,25D3-induced growth suppression was more pronounced in RIPK1-null MEFs and RIPK1-knockdown ovarian cancer cells than in control cells. Our studies have defined RIPK1 as a VDR repressor, projecting RIPK1 depletion as a potential strategy to increase the potency of 1,25D3 and its analogs for cancer intervention.
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