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• W1987317482 endingPage "687" @default.
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• W1987317482 abstract "Serotonin (5-HT) is involved in a large variety of physiological functions and it appears now that it could play a role in cognitive processes through the activation of 5-HT4 receptors. The present study was conducted to determine the effect of BIMU1, a mixed 5-HT4 agonist/5-HT3 antagonist on social olfactory recognition in rats, a behaviour test which has previously been shown to access short-term memory and to be sensitive to cholinergic drugs. This test is based on the investigation of an unfamiliar juvenile by an adult rat during two distinct 5-min presentations. At a 30-min delay after each presentation adults recognized the juvenile, whereas after a 2-hr delay all the adults had forgotten it. When administered intraperitoneally immediately after the first presentation, BIMU1 (10 mg/kg) enhanced short-term memory (i.e. recognition of the juvenile after a 2-hr delay). Ondansetron (10 and 100 micrograms/kg injected intraperitoneally), a 5-HT3 antagonist, had no significant effect on this form of memory. The effect of BIMU1 was antagonized by intraperitoneal injection of GR 125487, a very selective and potent 5-HT4 antagonist. The antagonistic effect was obtained at 1 and 10 mg/kg of GR 125487, but not at 0.1 mg/kg. It is certainly a specific effect on brain 5-HT4 receptors, since we determined a brain concentration of GR 125487 equal to 3.8 x 10(-7) M after the intraperitoneal injection of 10 mg/kg of this drug. This GR 125487 concentration is certainly sufficient to occupy all the 5-HT4 brain receptors (Kd = 10(-10) M) but not to occupy 5-HT3 receptors (Kd > 10(-6) M). The 5-HT4 specificity of the blockade by GR 125487 is further demonstrated by the fact that a 10-fold lower dose of GR 125487 (1 mg/kg) is also effective to inhibit the BIMU1 effect." @default.
• W1987317482 created "2016-06-24" @default.
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• W1987317482 date "1997-04-01" @default.
• W1987317482 modified "2023-10-03" @default.
• W1987317482 title "5-HT 4 Receptors Improve Social Olfactory Memory in the Rat" @default.
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• W1987317482 doi "https://doi.org/10.1016/s0028-3908(96)00169-4" @default.
• W1987317482 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9225294" @default.
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