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- W2053415917 abstract "This experiment examined and compared the effects of pre-test administration of morphine, naloxone and ethanol, at doses in the range of milligram/kg to those of nanogram/kg, on morphine state-dependent learning in a step-down passive avoidance task in mice. Morphine (5 mg/kg) administered before training impaired retention tested 24 hours later, but when the same dose of morphine was also administered before the test, the retention was significantly restored. Pre-training administration of 10 or 20 ng/kg (i.p.) of morphine had no effect, but when co-administered with the same drug at 5 mg/kg (s.c.), it prevented significantly the memory recall improvement after the administration of morphine (5 mg/kg, s.c.) alone. In a parallel experiment, naloxone (5 mg/kg) prevented the memory recall improvement by morphine. However, the effects of naloxone at doses in the range of ng/kg were opposite to those of milligram doses of the same drug. Pre-test administration of ethanol (1 mg/kg) improved memory recall and mimicked the effects of pre-test morphine administration. At doses in the nanogram range, the effects of ethanol were opposite those of mg/kg of the drug. A review of the literature indicates that, for several drugs and chemicals, the effects of nanogram doses are the opposite of the effects of milligrams, because different doses have different sites as well as mechanisms of actions. In conclusion, from the above results one may suggest that, in determination of the dose-response of at least some drugs, the study of the effects of doses much lower than two orders of magnitude of the minimum effective dose are warranted." @default.
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- W2053415917 date "2005-05-01" @default.
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- W2053415917 title "Effects of ultra-low doses of morphine, naloxone and ethanol on morphine state-dependent memory of passive avoidance in mice" @default.
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- W2053415917 doi "https://doi.org/10.1097/00008877-200505000-00002" @default.
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