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• W2077858461 abstract "1. Using whole-cell patch clamp recording from neurones in an in vitro slice preparation, we have examined opioid- and orphanin FQ (OFQ)-mediated modulation of synaptic transmission in the rat arcuate nucleus and ventromedial hypothalamus (VMH). 2. Application of OFQ activated a Ba2+-sensitive and inwardly rectifying K+ conductance in approximately 50 % of arcuate nucleus neurones and approximately 95 % of VMH neurones. The OFQ-activated current was blocked by the nociceptin antagonist [Phe1Psi(CH2NH)Gly2]-nociceptin(1-13) NH2 (NCA), a peptide that on its own exhibited only weak agonist activity at high concentrations (> 1 microM). Similar current activation was observed with the mu agonist DAMGO but not delta (DPDPE) or kappa (U69593) agonists. 3. In arcuate nucleus neurones, DAMGO (1 microM), U69593 (1 microM) and OFQ (100 nM to 1 microM) but not DPDPE (1 microM) were found to depress the amplitude of electrically evoked glutamatergic postsynaptic currents (EPSCs) and decrease the magnitude of paired-pulse depression, indicating that opioid receptors were located presynaptically. 4. In VMH neurones, DAMGO strongly depressed the EPSC amplitude in all cells examined. DAMGO decreased the magnitude of paired-pulse depression, indicating that mu receptors were located presynaptically. U69593 weakly depressed the EPSC while OFQ and DPDPE had no effect. 5. In VMH neurones, DAMGO depressed the frequency of miniature EPSCs (-58 %) in the presence of tetrodotoxin and Cd2+ (100 microM), suggesting that the actions of mu receptors could be mediated by an inhibition of the synaptic vesicle release process downstream of Ca2+ entry. 6. The data presented show that presynaptic modulation of excitatory neurotransmission in the arcuate nucleus occurs through mu, kappa and the orphan opioid ORL-1 receptors while in the VMH presynaptic modulation only occurs through mu opioid receptors. Additionally, postsynaptic mu and ORL-1 receptors in both the arcuate nucleus and VMH modulate neuronal excitability through activation of a K+ conductance." @default.
• W2077858461 created "2016-06-24" @default.
• W2077858461 creator A5052059067 @default.
• W2077858461 creator A5061375376 @default.
• W2077858461 date "1999-06-01" @default.
• W2077858461 modified "2023-10-01" @default.
• W2077858461 title "Pre‐ and postsynaptic actions of opioid and orphan opioid agonists in the rat arcuate nucleus and ventromedial hypothalamus <i>in vitro</i>" @default.
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• W2077858461 doi "https://doi.org/10.1111/j.1469-7793.1999.0431t.x" @default.
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