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Characterization of the condensin component Cnap1 and protein kinase Melk as novel E2F target genes down-regulated by 1,25-dihydroxyvitamin D3.

J Biol Chem. 2005 Nov 11;280(45):37319-30. Epub 2005 Sep 06
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摘要


1,25-Dihydroxyvitamin D(3) (1,25(OH)(2)D(3)) has potent antiproliferative effects characterized by a hampered G(1)/S transition. cDNA microarrays were used to monitor expression of 21,492 genes in MC3T3-E1 mouse osteoblasts at 1, 6, 12, 24, and 36 h after treatment with 1,25(OH)(2)D(3). Statistical analysis revealed a cluster of genes that were strongly down-regulated by 1,25(OH)(2)D(3) and which not only function in cell cycle regulation and DNA replication but also mediate checkpoint control, DNA repair, chromosome modifications, and mitosis. Because many of these genes were shown earlier to be regulated by the transcriptional repressor E2F4, the intergenic regions of these 1,25(OH)(2)D(3)-down-regulated genes were searched for the presence of E2F binding sites. This led to the characterization of two novel E2F target genes, chromosome condensation-related SMC-associated protein 1 (Cnap1) and maternal embryonic leucine zipper kinase (Melk). Transfection studies and site-directed mutagenesis confirmed Cnap1 and Melk to be bona fide E2F targets. Repression of Cnap1 and Melk by 1,25(OH)(2)D(3) was confirmed not only in MC3T3-E1 cells but also in several other bone-unrelated cell types. This down-regulation as well as the antiproliferative effect of 1,25(OH)(2)D(3) depended on the pocket proteins p107 and p130 because 1,25(OH)(2)D(3) failed to repress these E2F target genes and lost its antiproliferative action in p107(-/-);p130(-/-) cells but not in pRb(-/-) cells.

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