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- W2023152352 abstract "Recently it has been reported that histone type H2A can inhibit gonadotrophin-stimulated cAMP formation and steroidogenesis by ovarian cells. In the present study we have investigated if similar antigonadotrophic effects of commercially available histones can also be demonstrated on testicular steroidogenic cells. Using percoll-purified mouse Leydig cells, we have demonstrated that several types of histones could almost completely inhibit hCG-stimulated testosterone production and cAMP formation. The inhibition was dose-dependent and could be reversed by the addition of excess of hCG. The most potent histone types were H2AS and H8S, both of which could inhibit hCG-stimulated cAMP formation half-maximally at concentrations of 4-5 micrograms/ml. Forskolin-stimulated cAMP formation was not affected by histones. When the cells were stimulated with either db-cAMP or rAP-II, histone H2AS and H8S failed to inhibit the testosterone production. In fact there was a marked increase in the amount of testosterone produced, the reason for which is not yet understood. The amount of cGMP accumulated in response to rAP-II was not affected by the presence of H2AS or H8S. In unstimulated cells, neither the cyclic nucleotide level nor the amount of steroid produced was affected by the histones. Based on the [125I]hCG binding data it is possible to conclude that histone H2AS inhibits the binding of hCG to its receptors on Leydig cells and thereby causes the inhibition of hCG-stimulated cAMP formation and steroidogenesis." @default.
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- W2023152352 date "1990-12-01" @default.
- W2023152352 modified "2023-09-27" @default.
- W2023152352 title "Histones inhibit human chorionic gonadotrophin-stimulated but not atrial peptide-stimulated testosterone production and cyclic nucleotide formation by isolated mouse leydig cells" @default.
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- W2023152352 doi "https://doi.org/10.1016/0960-0760(90)90344-k" @default.
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