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Piot, Odile; Betschart, Josette; Grall, Isabelle; Ravard, Sophie; Garret, Claude; Blanchard, Jean‐Charles
British journal of pharmacology, November 1995, Letnik: 116, Številka: 5Journal Article
1 The NK, tachykinin receptor agonists, septide, Sar9, Met(O2)11SP and Pro9SP produced locomotor hyperactivity (10–20 min) when injected intracerebroventricularly (i.c.v.) in the guinea‐pig. Producedlocomotor The most potent in eliciting this hyperactivity was septide (from 0.63 to 5 μg), compared to Sar9, Met(O2)11SP, which was active at 2.5 and 5 μg and Pro9SP which induced a non‐significant increase even at 10 μg. 2 Wet‐dog shakes were elicited by septide, Sar9, Met(O2)11SP and Pro9SP injected by the i.c.v. route in the guinea‐pig. Sar9, Met(O2)11SP, active from 0.16 to 2.5 μg was more potent than septide (active at 1.25 μg) and Pro9SP (active at 0.63 μg) in eliciting such behaviour. To a lesser extent, grooming was also observed after injection of these agonists. 3 The NK2 tachykinin receptor agonist, Lys5, MeLeu9, Nle10NKA(4–10), up to the dose of 10 μg i.c.v. had no effect in the guinea‐pig. It neither modified locomotor activity nor induced a characteristic behavioural response. At higher doses (20μg), some toxic effects were noted. 4 The NK3 tachykinin receptor agonist, senktide, contrasts with the NK1 receptor agonists in that it elicited only wet‐dog shakes, at doses ranging from 0.32 to 1.25 μg. It neither modified locomotor activity (1 pg) nor induced grooming (up to 5 μg) in the guinea‐pig. 5 To our knowledge, these results are the first demonstration that the guinea‐pig could be useful to differentiate tachykinin agonists on the basis of their behavioural profile, distinct from those obtained in mice and rats.
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