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• W2113373744 endingPage "414" @default.
• W2113373744 startingPage "399" @default.
• W2113373744 abstract "Hypocretin/orexin (Hcrt) is a critical neurotransmitter for the maintenance of wakefulness and has been implicated in several other functions, including energy metabolism and reward. Using whole‐cell patch‐clamp recordings from transgenic mice in which enhanced green fluorescent protein was linked to the Hcrt promoter, we investigated GABAergic control of the Hcrt neurones in hypothalamic slices. Bath application of GABA or muscimol caused an early hyperpolarization mediated by Cl − and a late depolarization mediated by the efflux of bicarbonate. These GABA A receptor‐mediated responses were blocked by picrotoxin and bicuculline. Under the GABA A blockade condition, GABA produced consistent hyperpolarization, decreased firing rate and input resistance. The selective GABA B agonist ( R )‐baclofen caused a similar response with an EC 50 of 7.1 μ m . The effects of ( R )‐baclofen were blocked by the GABA B antagonist CGP 52432 but persisted in the presence of tetrodotoxin, suggesting direct postsynaptic effects. The existence of GABA B modulation was supported by GABA B(1) subunit immunoreactivity on Hcrt cells colabelled with antisera to the Hcrt‐2 peptide. Furthermore, GABA B receptor activation inhibited the presynaptic release of both glutamate and GABA. ( R )‐Baclofen depressed the amplitude of evoked excitatory postsynaptic currents (EPSCs) and inhibitory synaptic currents (IPSCs), and also decreased the frequency of both spontaneous and miniature EPSCs and IPSCs with a modest effect on their amplitudes. These data suggest that GABA B receptors modulate Hcrt neuronal activity via both pre‐ and postsynaptic mechanisms, which may underlie the promotion of non‐rapid eye movement sleep and have implications for the use of GABA B agonists in the treatment of substance addiction through direct interaction with the Hcrt system." @default.
• W2113373744 created "2016-06-24" @default.
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• W2113373744 date "2006-07-06" @default.
• W2113373744 modified "2023-10-16" @default.
• W2113373744 title "GABA_B receptor‐mediated modulation of hypocretin/orexin neurones in mouse hypothalamus" @default.
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• W2113373744 doi "https://doi.org/10.1113/jphysiol.2006.108266" @default.
• W2113373744 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1817779" @default.

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