Summary
The inhibitory effect of nicotine pretreatment on reserpine-induced depletion of monoamines in mouse brain was investigated. The depletion of brain monoamines by 24 h after intraperitoneal injection of reserpine (2 mg/kg) was dose-dependently inhibited by nicotine (0.3 – 10 mg/kg, s.c.) pretreatment 20 min before reserpine injection. This effect of nicotine was more marked on dopamine depletion than on noradrenaline or 5-hydroxytryptamine depletion. The nicotine pretreatment also inhibited the reserpine-induced hypothermia and decrease in the locomotor activity. When reserpine (2 mg/kg) was injected intraperitoneally, the inhibitory effect of nicotine (3 mg/kg, s.c.) on the reserpine-induced depletion of brain monoamines and heart noradrenaline was not antagonized by hexamethonium (8 mg/kg, s.c.) but rather potentiated by mecamylamine (2 mg/kg, s.c.). However, when reserpine (0.5 mg/kg) was injected intravenously, pretreatment with nicotine (3 mg/kg, s.c.) inhibited the reserpine-induced dopamine depletion only, and this effect of nicotine was completely blocked by mecamylamine but not by hexamethonium. These results suggest that inhibitory effect of nicotine on the intraperitoneal reserpine-induced depletion of brain monoamines is due to an inhibition of absorption of reserpine, and that central nicotinic action is also involved in the antagonism by nicotine of reserpine-induced dopamine depletion.
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Correspondence to R. Oishi at the above address
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Oishi, R., Suemaru, K., Furuno, K. et al. Possible explanations for the antagonism by nicotine against reserpine-induced depletion of monoamines in mouse brain. Naunyn-Schmiedeberg's Arch Pharmacol 348, 154–157 (1993). https://doi.org/10.1007/BF00164792
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DOI: https://doi.org/10.1007/BF00164792