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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Modulation of 8-OH-DPAT-induced hypothermia by imipramine in rats.

The effects of imipramine on 8-hydroxy-2-(di-n-propylamino) tetralin (8-OH-DPAT), the 5-hydroxytryptamine (5-HT)(1A)-receptor full agonist, -induced hypothermia was examined in rats. Single administration of imipramine (30 mg/kg, i.p.) attenuated 8-OH-DPAT-induced hypothermia. This effect of imipramine was blocked by the 5-HT(2A)-receptor antagonist ketanserin. 8-OH-DPAT-induced hypothermia was not altered 24 h after repeated administration of imipramine (1 - 10 mg/kg per day) for 14 days. However, 8-OH-DPAT-induced hypothermia was significantly enhanced in repeated imipramine (10 mg/kg per day)-treated rats that received 8-OH-DPAT plus imipramine 24 h after the final imipramine administration for 14 days. The 5-HT(2A)-receptor agonist 1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane ((+/-)-DOI) attenuated the 8-OH-DPAT-induced hypothermia in drug naive rats. The inhibitory effect of (+/-)-DOI (0.3 mg/kg, s.c.) on 8-OH-DPAT-induced hypothermia was attenuated by repeated administration of imipramine (10 mg/kg per day) for 14 days. These findings suggest that enhancement of the 5-HT(1A) receptors by repeated administration of imipramine may be due to reduction of the inhibitory effects from the 5-HT(2A) receptors to the 5-HT(1A) receptors.[1]


  1. Modulation of 8-OH-DPAT-induced hypothermia by imipramine in rats. Kitamura, Y., Araki, H., Shibata, K., Gomita, Y., Tanizaki, Y. J. Pharmacol. Sci. (2003) [Pubmed]
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