Publication Date:
1984-09-07
Description:
Several naturally occurring and synthetic flavones were found to inhibit the aromatization of androstenedione and testosterone to estrogens catalyzed by human placental and ovarian microsomes. These flavones include (in order of decreasing potency) 7,8-benzoflavone, chrysin, apigenin, flavone, flavanone, and quercetin; 5,6-benzoflavone was not inhibitory. 7,8-Benzoflavone and chrysin were potent competitive inhibitors and induced spectral changes in the aromatase cytochrome P-450 indicative of substrate displacement. Flavones may thus compete with steroids in their interaction with certain monooxygenases and thereby alter steroid hormone metabolism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kellis, J T Jr -- Vickery, L E -- AM1005/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1984 Sep 7;225(4666):1032-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6474163" target="_blank"〉PubMed〈/a〉
Keywords:
Androstenedione/*metabolism
;
*Aromatase Inhibitors
;
Benzoflavones/metabolism/pharmacology
;
Binding Sites
;
Binding, Competitive
;
Female
;
Flavonoids/metabolism/*pharmacology
;
Humans
;
Kinetics
;
Microsomes/enzymology
;
Ovary/*enzymology
;
Oxidoreductases/*antagonists & inhibitors
;
Placenta/*enzymology
;
Pregnancy
;
Testosterone/*metabolism
;
beta-Naphthoflavone
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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