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Mdm2 is a crucial negative regulator of the tumor suppressor function of p53. However, little is known about Mdm2 protein stability regulation by other tumor suppressors. Nuclear receptor small heterodimer partner (SHP, NROB2) functions as a tumor suppressor in liver cancer. We show here a surprising finding of a feedback regulatory loop between SHP and Mdm2. SHP stabilizes Mdm2 protein by abrogating...
We describe a transcriptional mechanism regulating the expression of Dnmt1 by nuclear receptors. We show that ERRγ functions as a transcriptional activator of mouse and human Dnmt1 expression by direct binding to its response elements (ERE1/ERE2) in the dnmt1/DNMT1 promoters. The induction of Dnmt1 by ERRγ is repressed by SHP through SHP inhibition of ERRγ transactivity, diminishing ERRγ recruitment...
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