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• W2024392942 endingPage "291" @default.
• W2024392942 startingPage "283" @default.
• W2024392942 abstract "Trace Amine-Associated Receptor 1 (TAAR1) is a G protein-coupled receptor (GPCR) expressed in several mammalian brain areas and activated by trace amines (TAs). TAs role is unknown; however, discovery of their receptors provided an opportunity to investigate their functions. In vivo evidence has indicated an inhibitory influence of TAAR1 on dopamine (DA) neurotransmission, presumably via modulation of dopamine transporter (DAT) or interaction with the D2 DA receptor and/or activation of inwardly rectifying K(+) channels. To elucidate the mechanisms of TAAR1-dependent modulation, we used TAAR1 knockout mice (TAAR1-KO), a TAAR1 agonist (RO5166017) and a TAAR1 antagonist (EPPTB) in a set of neurochemical experiments. Analysis of the tissue content of TAAR1-KO revealed increased level of the DA metabolite homovanillic acid (HVA), and in vivo microdialysis showed increased extracellular DA in the nucleus accumbens (NAcc) of TAAR1-KO. In fast scan cyclic voltammetry (FSCV) experiments, the evoked DA release was higher in the TAAR1-KO NAcc. Furthermore, the agonist RO5166017 induced a decrease in the DA release in wild-type that could be prevented by the application of the TAAR1 antagonist EPPTB. No alterations in DA clearance, which are mediated by the DAT, were observed. To evaluate the interaction between TAAR1 and D2 autoreceptors, we tested the autoreceptor-mediated dynamics. Only in wild type mice, the TAAR1 agonist was able to potentiate quinpirole-induced inhibitory effect on DA release. Furthermore, the short-term plasticity of DA release following paired pulses was decreased in TAAR1-KO, indicating less autoinhibition of D2 autoreceptors. These observations suggest a close interaction between TAAR1 and the D2 autoreceptor regulation." @default.
• W2024392942 created "2016-06-24" @default.
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• W2024392942 date "2014-06-01" @default.
• W2024392942 modified "2023-10-14" @default.
• W2024392942 title "Taar1-mediated modulation of presynaptic dopaminergic neurotransmission: Role of D2 dopamine autoreceptors" @default.
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• W2024392942 doi "https://doi.org/10.1016/j.neuropharm.2014.02.007" @default.
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