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- W4361822467 abstract "<div>Abstract<p>The peptidyl-prolyl-isomerase Pin1 interacts with phosphorylated proteins, altering their conformation. The retinoic acid receptor RARα and the acute-promyelocytic-leukemia–specific counterpart PML-RARα directly interact with Pin1. Overexpression of Pin1 inhibits ligand-dependent activation of RARα and PML-RARα. Inhibition is relieved by Pin1-targeted short interfering RNAs and by pharmacologic inhibition of the catalytic activity of the protein. Mutants of Pin1 catalytically inactive or defective for client-protein–binding activity are incapable of inhibiting ligand-dependent RARα transcriptional activity. Functional inhibition of RARα and PML-RARα by Pin1 correlates with degradation of the nuclear receptors via the proteasome-dependent pathway. In the acute myelogenous leukemia cell lines HL-60 and NB4, Pin1 interacts with RARα in a constitutive fashion. Suppression of Pin1 by a specific short hairpin RNA in HL-60 or NB4 cells stabilizes RARα and PML-RARα, resulting in increased sensitivity to the cytodifferentiating and antiproliferative activities of <i>all-trans</i> retinoic acid. Treatment of the two cell lines and freshly isolated acute myelogenous leukemia blasts (M1 to M4) with ATRA and a pharmacologic inhibitor of Pin1 causes similar effects. Our results add a further layer of complexity to the regulation of nuclear retinoic acid receptors and suggest that Pin1 represents an important target for strategies aimed at increasing the therapeutic index of retinoids. [Cancer Res 2009;69(3):1016–26</p></div>" @default.
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- W4361822467 date "2023-03-30" @default.
- W4361822467 modified "2023-10-18" @default.
- W4361822467 title "Data from Inhibition of the Peptidyl-Prolyl-Isomerase Pin1 Enhances the Responses of Acute Myeloid Leukemia Cells to Retinoic Acid via Stabilization of RARα and PML-RARα" @default.
- W4361822467 doi "https://doi.org/10.1158/0008-5472.c.6499344.v1" @default.
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