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- W2047779056 abstract "Both human and animal studies suggest that there are sex differences in responding to noxious stimulation as well as in effects of opiate analgesic drugs. Development and/or expression of tolerance to opiate analgesia are also affected by the hormonal status of the experimental subjects. The present study aimed to compare acute tolerance to morphine in cycling and ovariectomized female rats and to evaluate the effects of N-methyl-D-aspartate (NMDA) receptor channel blocker memantine as well as 17-beta-estradiol on tolerance development using the tail-flick test. Acute tolerance to morphine analgesia was observed as a substantial reduction in the response to a test dose of morphine (10 mg/kg) given 6 h after the tolerance-inducing dose (10 mg/kg). Significant acute tolerance was observed in proestrous female rats and was prevented by memantine (3 or 10 mg/kg) treatment. Ovariectomized rats did not demonstrate tolerance to morphine analgesic effects but chronic estradiol administration (5 microg/day, 5 days) reinstated induction of tolerance. Both estrogen receptor modulator tamoxifen (5 mg/kg/day, 5 days) and memantine (3 mg/kg/day, 5 days) prevented estradiol-induced tolerance in ovariectomized rats. Thus, estrogens were found to play a key role in induction of acute tolerance to morphine antinociception. Estradiol-induced acute morphine tolerance may have NMDA receptor-dependent mechanisms." @default.
- W2047779056 created "2016-06-24" @default.
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- W2047779056 date "2006-03-01" @default.
- W2047779056 modified "2023-09-25" @default.
- W2047779056 title "Effects of memantine on estrogen-dependent acute tolerance to the morphine analgesia in female rats" @default.
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- W2047779056 doi "https://doi.org/10.1016/j.ejphar.2006.02.020" @default.
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