Selection of 19-(ethyldithio)-androst-4-ene-3,17-dione (ORG 30958): A potent aromatase inhibitor in vivo
| Autor: | Helenius J. Kloosterboer, J.A.A. Geelen, L.W.J. Tax, H.J.J. Loozen, G.H. Deckers, J.T.H. van der Wardt |
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| Rok vydání: | 1991 |
| Předmět: |
Male
Ovulation Testosterone propionate medicine.medical_specialty Gonadotropins Equine medicine.drug_class Ovariectomy Endocrinology Diabetes and Metabolism Clinical Biochemistry In Vitro Techniques Biochemistry chemistry.chemical_compound Dogs Endocrinology Estrus In vivo Internal medicine medicine Animals Humans Testosterone Aromatase Molecular Biology Aromatase inhibitor Estradiol biology Aromatase Inhibitors Dehydroepiandrosterone Sulfate Ovary Androstenedione Rats Inbred Strains Biological activity Dehydroepiandrosterone Cell Biology Rats chemistry Enzyme inhibitor Estrogen biology.protein Ovariectomized rat Molecular Medicine Female |
| Zdroj: | The Journal of Steroid Biochemistry and Molecular Biology. 38:181-188 |
| ISSN: | 0960-0760 |
| DOI: | 10.1016/0960-0760(91)90124-n |
| Popis: | 19-Mercaptoandrost-4-ene-3,17-dione (ORG 30365) has been reported to be both a competitive and irreversible inhibitor of aromatase. In comparison to the known aromatase inhibitors 4-hydroxy-androst-4-ene-3,17-dione (4OH-AD) and 1-methyl-1,4-androstadiene-3,17-dione (SH 489), ORG 30365 was found to be, respectively, about 16 and 8 times more active in vitro using human placental microsomes. Although the activity profile of ORG 30365 is very attractive, this compound was not selected for further development because it has limited pharmaceutical stability, which is probably due to its free —SH group and therefore a number of more stable dithio-derivatives of ORG 30365 have been synthesized. These derivatives are considered to be converted to ORG 30365 before they become active. The in vivo aromatase inhibiting activity of these derivatives was determined in hypophysectomized rats treated with the estrogen precursor dehydroepiandrosterone sulphate (DHEAS) using inhibition of cornification of vaginal epithelium as parameter. The 19-(ethyldithio)-derivative (ORG 30958) appeared to be the most active inhibitor in this series being twice as active as ORG 30365 and about 8 times as active as inhibitors like 4OH-AD and SH 489. Besides inhibition of cornification of vaginal epithelium ORG 30958 decreased ovarian aromatase and plasma E 2 levels in DHEAS-treated hypophysectomized rats. Plasma estradiol levels were also lowered by ORG 30958 in dogs which were treated with pregnant mare serum gonadotrophin in order to induce pro-estrus. ORG 30958 displayed much less than 1/400th of the androgenic activity of testosterone propionate in immature castrated rats and appeared to be devoid of estrogenic and anti-estrogenic activity in ovariectomized mature rats. A twice daily dose of 1.5 mg ORG 30958/kg postponed ovulation in mature female rats. In conclusion: ORG 30958 is a potent aromatase inhibitor in vivo . It probably becomes active after cleavage of the —Sz.sbnd;S— bond yielding ORG 30365 a poteny irreversible aromatase inhibitor. ORG 30958 does not display other hormonal activities making it an attractive candidate for the treatment of estrogen-dependent diseases. |
| Databáze: | OpenAIRE |
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