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  • Title: Prenylflavonoids: a new class of non-steroidal phytoestrogen (Part 2). Estrogenic effects of 8-isopentenylnaringenin on bone metabolism.
    Author: Miyamoto M, Matsushita Y, Kiyokawa A, Fukuda C, Iijima Y, Sugano M, Akiyama T.
    Journal: Planta Med; 1998 Aug; 64(6):516-9. PubMed ID: 9741296.
    Abstract:
    In order to examine whether 8-isopentenylnaringenin (1), which has been proven to possess estrogen agonist activity in in vitro tests, also produces in vivo estrogenic properties, the effects of 1 on uterus and on bone metabolism were determined in ovariectomized rats. Rats were ovariectomized and treated with 1 at 30 mg/kg/day subcutaneously for two weeks or 17 beta-estradiol at 0.01 mg/kg/day subcutaneously for two weeks. Ovariectomy resulted in an increase in urinary excretion of bone resorption markers (hydroxyproline, pyridinoline and deoxypyridinoline) and a decrease in bone mineral density of the proximal tibia as well as reduced uterine weight. Treatment with 1 or 17 beta-estradiol completely suppressed these ovariectomy-induced bone and uterine changes in a qualitatively similar manner. These results demonstrate that 1 acts as an estrogen agonist in the uterus as well as in bone in vivo.
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