2002
DOI: 10.1248/bpb.25.1566
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Aromatase Inhibition by 4.BETA.,5.BETA.-Epoxides of 16.ALPHA.-Hydroxyandrostenedione and Its 19-Oxygenated Analogs, Potential Precursors of Estriol Production in the Feto-Placental Unit.

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Cited by 4 publications
(4 citation statements)
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“…These results suggest that a 3,4-double bond or a 3,4-epoxide group will confer the A-ring planarity required for anti-aromatase activity, according to the previous observations by Numazawa and co-workers. [15][16][17][18]24 Epoxide 4a proved to be the most potent inhibitor, revealing that, in addition to planarity, the oxygen atom near the C-4 region will be important for activity. A C-4 carbonyl group, as observed in 6, may also contribute to the above-mentioned requirements for anti-aromatase activity.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…These results suggest that a 3,4-double bond or a 3,4-epoxide group will confer the A-ring planarity required for anti-aromatase activity, according to the previous observations by Numazawa and co-workers. [15][16][17][18]24 Epoxide 4a proved to be the most potent inhibitor, revealing that, in addition to planarity, the oxygen atom near the C-4 region will be important for activity. A C-4 carbonyl group, as observed in 6, may also contribute to the above-mentioned requirements for anti-aromatase activity.…”
Section: Discussionmentioning
confidence: 99%
“…The studied SAR were correlated with three main features, namely, the A-ring substitution pattern and the planarity of this ring, the C-5 stereochemistry in the A/B-ring fusion, and the D-ring structure. Numazawa and co-workers have performed several SAR studies in steroid aromatase inhibitors indicating the existence of a binding pocket in the active site of the enzyme, which can accommodate several chemical groups placed at the C-4 position of the steroids. According to this information, we embarked on the design, synthesis, and biochemical evaluation of some C-4 oxo- ( 2 ), C-4 keto- ( 6 and 10 ), C-4 hydroxy- ( 5a , 5b , and 8 ), and C-4 hydroxycyano- ( 11 ) substituted androstanes (Schemes and ).…”
Section: Introductionmentioning
confidence: 99%
“…Las diferencias descritas en la capacidad de conjugar los estrógenos en las preeclámpticas puede explicar por qué se observa este fenómeno tanto en la orina como en la circulación general (24) . En el embarazo normal se convierten cantidades similares de sulfato de DHEA provenientes de las glándulas suprarrenales maternas y fetales en la placenta, para convertirlas en androstenodiona y testosterona, las cuales posteriormente son aromatizadas a estrona y estradiol, respectivamente (25) . También se produce una mayor cantidad de estriol (200 a 300 mg/día al término del embarazo) derivado del sulfato de DHEA producido por la glándula suprarrenal fetal, el cual es metabolizado a 16 alfa-hidroxisulfato de DHEA en el hígado y posteriormente transformado en estriol por la placenta (25) .…”
Section: Resultsunclassified
“…En el embarazo normal se convierten cantidades similares de sulfato de DHEA provenientes de las glándulas suprarrenales maternas y fetales en la placenta, para convertirlas en androstenodiona y testosterona, las cuales posteriormente son aromatizadas a estrona y estradiol, respectivamente (25) . También se produce una mayor cantidad de estriol (200 a 300 mg/día al término del embarazo) derivado del sulfato de DHEA producido por la glándula suprarrenal fetal, el cual es metabolizado a 16 alfa-hidroxisulfato de DHEA en el hígado y posteriormente transformado en estriol por la placenta (25) . Todos los estrógenos son secretados por la placenta a la circulación materna, principalmente en la forma no conjugada, para luego ser conjugados en el hígado materno.…”
Section: Resultsunclassified