PMID: 8599614Feb 29, 1996Paper

Testosterone inhibits the basal and gonadotropin-releasing hormone-stimulated synthesis and release of newly synthesized alpha- and lutropin (LH) beta-subunit but not release of stored LH in cultured rat pituitary cells

Biochimica Et Biophysica Acta
A StarzecR Counis

Abstract

To further explore the mechanism of steroid feedback in male, the effects of testosterone (T) and gonadotropin-releasing hormone (GnRH) on the rates of alpha- and lutropin (LH)beta-chain synthesis, neosynthesized subunits and radioimmunoassayable LH release into the medium were studied in the cultures of anterior pituitary cells from orchiectomized and intact rats. Polypeptides were [35S]methionine-labeled, immunoprecipitated separately in the medium and cells, then after SDS-PAGE precisely quantified. The total (medium + cells) radioactivity incorporated in the absence of GnRH into alpha- and LH beta-subunit was increased in orchiectomized rat cells vs. intact rat cells. GnRH stimulated the synthesis of both subunits, whether cells were from normal or castrated rat. T suppressed basal and GnRH-enhanced synthesis of both subunits in castrated rat cells. The values became closed to those observed in the normal rat cells. Also release of neosynthesized subunits from castrated rat cells into the culture medium was inhibited by T. In contrast, T did not change the basal and GnRH-induced radioimmunoassayed LH release. These results show that T can inhibit directly, at the pituitary level, alpha- and LH beta-subunit synthesis and neo...Continue Reading

References

Feb 1, 1990·Endocrine Reviews·S D GharibW W Chin
Oct 4, 1985·Science·R B Kelly
Aug 1, 1980·Analytical Biochemistry·E DahlbergJ A Gustafsson

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Citations

Oct 10, 2007·Journal of Endocrinological Investigation·A BachelotF Kuttenn
Nov 7, 2006·The Journal of Steroid Biochemistry and Molecular Biology·Juergen M WeissOlaf Ortmann

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