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- W1485752635 abstract "Abstract Testicular androgens suppress the synthesis and secretion of the pituitary gonadotropins, in particular, luteinizing hormone. This suppressive effect includes transcription of both the common alpha subunit gene and the unique beta subunit genes. Herein, we demonstrate that 1500 base pairs (bp) of proximal 5'-flanking region derived from the human alpha subunit gene and a shorter 315-bp segment of the bovine alpha subunit gene confer negative regulation by androgen to the gene encoding bacterial chloramphenicol acetyltransferase in transgenic mice. Cotransfection assays with human androgen receptor indicated that the 1500-bp promoter region of the human alpha subunit gene also confers androgen regulation (transcriptional suppression) to reporter genes in both pituitary and placental cell lines. This raises the possibility of a role for DNA binding in suppression of alpha subunit transcription by activated androgen receptor. Consistent with this possibility, we have used a gel-mobility shift assay to detect several high affinity binding sites for androgen receptor located in the proximal promoter of the human alpha subunit gene. The strongest androgen receptor binding site is located at approximately -101 in the proximal 5'-flanking region. This steroid receptor binding site overlaps another binding site that defines one of several contiguous cis-acting regulatory elements required for basal transcriptional activity. Thus, binding of activated androgen receptor to this region may block the binding of a requisite trans-acting factor and lead to an attenuation in transcription. We conclude that this interaction, which occurs directly at the level of the pituitary, represents one of several physiological avenues through which androgens regulate gonadotropin gene expression." @default.
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- W1485752635 date "1993-06-01" @default.
- W1485752635 modified "2023-09-28" @default.
- W1485752635 title "Transcriptional repression of the glycoprotein hormone alpha subunit gene by androgen may involve direct binding of androgen receptor to the proximal promoter" @default.
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- W1485752635 doi "https://doi.org/10.1016/s0021-9258(19)38685-5" @default.
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