Abstract
The hormonal form of vitamin D, 1,25-dihydroxyvitamin D3, acting through its cognate nuclear receptor (vitamin D3 receptor, VDR) will induce myeloid leukemic cell lines to terminally differentiate into monocytes/macrophages. Because VDR acts by transcriptionally regulating responsive genes in a ligand-dependent manner, we sought target genes of the receptor that initiate, the differentiation process in response to ligand. We screened a cDNA library prepared from the myelomonocytic U937 cell line with probes generated from either 1,25-dihydroxyvitamin D3-treated or untreated cells. We report here that a candidate clone that hybridized differentially is the Cdk inhibitor p21WAF1, CIP1. Furthermore, we show that p21 is transcriptionally induced by 1,25-dihydroxyvitamin D3 in a VDR-dependent, but not p53-dependent, manner, and we identify a functional vitamin D response element in the p21 promoter. Transient overexpression of p21 and/or the related Cdk inhibitor p27 in U937 cells in the absence of 1,25-dihydroxyvitamin D3 results in the cell-surface expression of monocyte/macrophage-specific markers, suggesting that ligand-modulated transcriptional induction of the p21 gene facilitates the induced differentiation of this monoblastic cell line. We believe that this is the first report demonstrating that the ectopic overexpression of a Cdk inhibitor such as p21 or p27 directly leads to a terminal differentiation program.
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Dates
Type | When |
---|---|
Created | 18 years, 2 months ago (June 5, 2007, 5:15 p.m.) |
Deposited | 2 years, 3 months ago (May 12, 2023, 2:24 a.m.) |
Indexed | 3 weeks, 5 days ago (July 30, 2025, 10:58 a.m.) |
Issued | 29 years, 7 months ago (Jan. 15, 1996) |
Published | 29 years, 7 months ago (Jan. 15, 1996) |
Published Online | 29 years, 7 months ago (Jan. 15, 1996) |
Published Print | 29 years, 7 months ago (Jan. 15, 1996) |
@article{Liu_1996, title={Transcriptional activation of the Cdk inhibitor p21 by vitamin D3 leads to the induced differentiation of the myelomonocytic cell line U937.}, volume={10}, ISSN={1549-5477}, url={http://dx.doi.org/10.1101/gad.10.2.142}, DOI={10.1101/gad.10.2.142}, number={2}, journal={Genes & Development}, publisher={Cold Spring Harbor Laboratory}, author={Liu, M and Lee, M H and Cohen, M and Bommakanti, M and Freedman, L P}, year={1996}, month=jan, pages={142–153} }