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Characterization of ligand binding, DNA binding and phosphorylation of progesterone receptor by two novel progesterone receptor antagonist ligands

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Abstract

In order to gain a better understanding of the distinctive mechanisms of the various types of antiprogestins, we have characterized in vitro ligand binding, specific DNA binding and phosphorylation of progesterone receptor (PR) from T47D cells after treatment of cells with progestins (progesterone, R5020) and antiprogestins (RU486, ZK98299, Org 31806 and Org 31710). Treatment of the cells with R5020 or PR antagonists, with the exception of ZK98299, resulted in a quantitative upshift of PR-A and PR-B indicative of ligand/DNA-induced phosphorylation of PR. Treatment of cells with RU486, Org 31710 or Org 31806, but not R5020 or ZK98299 resulted in detectable PR-progesterone response element complexes (PR-PREc) as assessed by gel mobility shift assay. Although treatment of cells with ZK98299, a type I PR antagonist, did not induce phosphorylation, the antiprogestins, Org 31806 and Org 31710, in a manner identical to RU486, did. Our data suggest that Org 31806 and Org 31710 affect propertie s of PR from T47D cells that are similar to RU486. (Mol Cell Biochem 175: 205–212, 1997)

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Authors and Affiliations

  1. Department of Biological Sciences and the Institute for Biochemistry and Biotechnology, Oakland University, Rochester, USA

    Cliff Hurd, Bill Underwood, Michelle Herman, Sumit Dinda & Virinder K. Moudgil

  2. N.V. Organon Scientific Development Group, Oss, The Netherlands

    H.J. Kloosterboer

  3. Department of Biological Sciences and the Institute for Biochemistry and Biotechnology, Oakland University, Rochester, USA

    Kazumi Iwasaki

Authors
  1. Cliff Hurd
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  2. Bill Underwood
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  3. Michelle Herman
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  4. Kazumi Iwasaki
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  5. H.J. Kloosterboer
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  6. Sumit Dinda
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  7. Virinder K. Moudgil
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Hurd, C., Underwood, B., Herman, M. et al. Characterization of ligand binding, DNA binding and phosphorylation of progesterone receptor by two novel progesterone receptor antagonist ligands. Mol Cell Biochem 175, 205–212 (1997). https://doi.org/10.1023/A:1006827701940

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