Sp1 and NF-Y synergistically mediate the effect of vitamin D3 in the p27Kip1 gene promoter that lacks vitamin D response elements

被引:131
作者
Inoue, T [1 ]
Kamiyama, J [1 ]
Sakai, T [1 ]
机构
[1] Kyoto Prefectural Univ Med, Dept Prevent Med, Kamigyo Ku, Kyoto 6028566, Japan
关键词
D O I
10.1074/jbc.274.45.32309
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Vitamin D-3 promotes myeloid leukemic cell lines to differentiate terminally into monocytes/macrophages. It has been reported that overexpression of the cdk inhibitor p27(Kip1) results in the differentiation of the myelomonocytic U937 cell line and that this gene is the target of vitamin D-3. To identify the sequences required for the positive regulation of p27(Kip1) transcription by man p27(Kip1) 3.6-kilobase 5'-flanking region of the human was examined by transiently transfecting luciferase reporter constructs into U937 cells. The transcriptional activity of this construct was activated by vitamin D-3. Deletion and mutational analysis revealed that both a GGGCGG sequence (-545/-539) and a CCAAT sequence (-525/-520) were necessary to induce p27(Kip1) gene expression. Importantly, the region containing both of these elements conferred positive responsiveness to vitamin D-3 to a heterologous promoter. Gel shift assays showed that Spl binds to the GGGCGG sequence and that NF-Y binds to the CCAAT sequence. Consistent with the roles of these transcription factors, treatment with vitamin DQ Stimulated the DNA binding activities of these factors to each element and induced the change of one NF-Y subunit. We conclude that vitamin D-3 stimulates transcription of the p27(Kip1) gene by a novel mechanism involving Spl and NF-Y, but not the vitamin D receptor, during the early stages of U937 cell differentiation.
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页码:32309 / 32317
页数:9
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