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Estrogen-like effect of a Cimicifuga racemosa extract sub-fraction as assessed by in vivo, ex vivo and in vitro assays
Ist Teil von
The Journal of steroid biochemistry and molecular biology, 2007-11, Vol.107 (3), p.262-269
Ort / Verlag
Oxford: Elsevier Ltd
Erscheinungsjahr
2007
Link zum Volltext
Quelle
MEDLINE
Beschreibungen/Notizen
Black cohosh (
Cimicifuga racemosa) is used in the treatment of painful menstruation and menopausal symptoms. Data about the nature of the active compounds and mechanism(s) of action are still controversial, chiefly with respect to its estrogenic activity.
This work aimed to assess the possible estrogenic activity of a commercial dry hydro-alcoholic extract of
C. racemosa and its hydrophilic and lipophilic sub-fractions on
in vivo,
ex vivo, and
in vitro assays.
In a yeast estrogen screen, only the lipophilic sub-fraction was able to activate the human estrogen receptor α, with a lower potency but comparable efficacy to that of 17 β-estradiol.
Neither the total extract nor the lipophilic sub-fraction showed an
in vivo uterotrophic effect in 21-day-old rats. Uterine tissues obtained
ex vivo from
C. racemosa treated animals were generally much less sensitive to oxytocin, prostaglandin F
2α, and bradykinin than tissues obtained from estradiol valerate treated rats.
The lipophilic sub-fraction, instead, induced a dose-dependent inhibitory activity on the
in vitro response to oxytocin, prostaglandin F
2α, and bradykinin of uterine horns from naïve 28-day-old rats, with a potency rate close to 1:30 of that of 17 β-estradiol.
Reported results confirm the effectiveness of
C. racemosa in menstrual distress and further emphasize the possibility that lipophilic constituents bind to an as yet not identified estrogen receptor, likely inversely involved in inflammation.