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Bromleigh, V C; Freedman, L P
Genes & development, 2000-Oct-15, 2000-10-15, 20001015, Volume: 14, Issue: 20Journal Article
The myeolomonocytic cell line U937 differentiates into macrophages in response to a variety of agents. Several genes including the cyclin-dependent kinase inhibitor p21(waf1/cip1) and the homeobox gene transcription factor HOXA10 are induced at the onset of differentiation. Ectopic expression of either gene results in U937 differentiation. In this paper, we describe a mechanism by which p21 and HOXA10 may act in concert, where HOXA10 can bind directly to the p21 promoter and, together with its trimeric partners PBX1 and MEIS1, activate p21 transcription, resulting in cell cycle arrest and differentiation. These experiments for the first time identify p21 as a selective target for a HOX protein and link the differentiative properties of a transcription factor and a cell cycle inhibitor.
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