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    J Steroid Biochem Mol Biol. 1991;40(1-3):271-8.

    Progestin receptors: isoforms and antihormone action.

    Source

    Laboratoire de Génétique Moléculaire des Eucaryotes du CNRS, Institut de Chimie Biologique, Faculté de Médecine, Strasbourg, France.

    Abstract

    We present evidence that the two isoforms of A and B of the chicken (cPR) and human progesterone receptor (hPR) originate from two different mRNA populations. One of these encodes the isoforms A which originate by initiation of translation at an in-frame AUG found 127 (cPR) and 165 (hPR) codons downstream of the AUG which gives rise to the isoforms B. Two estrogen-inducible hPR promoters were identified which are responsible for the generation of these two classes of transcripts. Characterization of the cPR promoter suggested the possible existence of cell-type and isoform-specific auto-regulation of cPR transcription and provided evidence that estrogen-induction of cPR expression occurs at a post-transcriptional level. Finally, we demonstrate promoter-specific transcriptional activation by the hPR isoforms A and B, and we discuss the mechanism of action of the anti-progestin RU486.

    PMID:
    1958531
    [PubMed - indexed for MEDLINE]

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