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

The effect of 5-HT1A receptor agonists on locomotor activity in the guinea-pig.

1. The present study examined the effects of 8-hydroxy-2-(di-n-propylamino) tetralin (8-OH-DPAT), flesinoxan, ipsapirone and buspirone, all agonists at the 5-HT1A receptor, on the locomotor activity of guinea-pigs. The effects of these drugs were contrasted with those of the non-selective 5-HT agonist, 5-methoxy-N,N-dimethyl tryptamine (5-MeO-DMT) and the dopamine D2 antagonist, raclopride. 2. 8-OH-DPAT, flesinoxan and 5-MeO-DMT markedly increased the locomotor activity of naive, unhabituated guinea-pigs in a dose-dependent manner. Buspirone also did so, although to a lesser extent and for a shorter time. The doses at which this effect was seen were higher than those normally employed in rats. Ipsapirone and raclopride had no significant effects on locomotor activity. 3. The locomotor activity increasing effect of 1.0 mg kg-1 8-OH-DPAT was blocked by the selective 5-HT1A antagonist (S)-UH-301 (3.0 and 10.0 mg kg-1), but not by (-)-alprenolol (15.0 mg kg-1). Ipsapirone (30.0 mg kg-1) and raclopride (3.0 mg kg-1) antagonized 8-OH-DPAT-induced locomotor activity but only to a small extent. The 5-HT reuptake inhibitor, zimelidine (10.0 mg kg-1) had no effect. 4. The effect of the 5-HT1A agonists in the guinea-pig contrasts with the effects of 8-OH-DPAT on the locomotor activity of unhabituated rats and mice tested in the same apparatus, but are similar to the effects of 8-OH-DPAT on habituated rats, which show a low baseline of activity.(ABSTRACT TRUNCATED AT 250 WORDS)[1]


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