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- W2056556048 abstract "A novel opioid receptor family, the nociceptin/orphanin FQ (N/OFQ) peptide (NOP) receptors, has been identified to be involved in many physiological functions including pain regulation. CompB (also known as J-113397) is the first non-peptide antagonist of NOP receptors. Using the patch-clamp recording technique in brain slices, we have quantitatively studied the interactions of CompB with N/OFQ at native NOP receptors of ventrolateral neurons of the midbrain periaqueductal gray (PAG), a crucial region for N/OFQ-induced reversal of opioid analgesia. N/OFQ concentration-dependently activated inwardly rectifying K + channels in response to hyperpolarization ramps from –60 to –140 mV. CompB attenuated the magnitude but not the reversal potential of the K + current activated by N/OFQ in a concentration-dependent manner. The presence of CompB produced a parallel right-shift of the concentration-response curve to N/OFQ. The Schild plot analysis yielded a pA 2 value of 8.37. At concentrations up to 1 μM, CompB affected neither the membrane current per se nor the inwardly rectifying K + current activated by [D-Ala 2 , N-Me-Phe 4 ,Gly-ol 5 ]-enkephalin or baclofen, a mu-opioid and GABA B receptor agonist, respectively. It appears that CompB, at nanomolar concentrations, is a pure, selective and competitive antagonist of postsynaptic NOP receptors that mediate inwardly rectifying K + channel activation in ventrolateral PAG neurons." @default.
- W2056556048 created "2016-06-24" @default.
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- W2056556048 date "2002-06-01" @default.
- W2056556048 modified "2023-09-26" @default.
- W2056556048 title "CompB (J-113397), selectively and competitively antagonizes nociceptin activation of inwardly rectifying K+ channels in rat periaqueductal gray slices" @default.
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- W2056556048 doi "https://doi.org/10.1016/s0028-3908(02)00051-5" @default.
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