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- W2069731331 abstract "Palmitoylethanolamide (PEA), a peroxisome proliferator-activated receptor-α (PPAR-α) ligand, exerts antinociceptive and anti-inflammatory effects. PEA (3 and 6 nmol) was microinjected in the ventrolateral periaqueductal grey (VL PAG) of male rats and effects on nociceptive responses and ongoing and tail flick-related activities of rostral ventromedial medulla (RVM) ON and OFF cells were recorded. Intra-PAG microinjection of PEA reduced the ongoing activity of ON and OFF cells and produced an increase in the latency of the nociceptive reaction. These effects were prevented by a selective PPAR-α antagonist, GW6471 and by a large-conductance Ca(2+)-activated K(+) channel inhibitor, charybdotoxin. Cannabinoid 1 (CB(1)) receptor blockade by AM251 increased the PEA-induced effect both on the ongoing activity of the ON cell and on the latency to tail flick without affecting the effect of PEA on the OFF cell. Conversely, a transient receptor potential vanilloid type 1 (TRPV(1)) blocker, I-RTX, had no effect on the ON cell activity and tail flick latency, whereas it blocked the PEA-induced decrease in ongoing activity of the OFF cell. PEA decreased the burst and increased the latency of tail flick-evoked onset of ON cell activity in a manner antagonised by GW6471 and charybdotoxin. AM251 and I-RTX, instead, enhanced these latter effects. In conclusion, intra-VL PAG PEA induces antinociceptive effects associated with a decrease in RVM ON and OFF cell activities. PPAR-α receptors mediate, and CB(1) and TRPV(1) receptors antagonise, PEA-induced effects within the PAG-RVM circuitry." @default.
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- W2069731331 date "2012-02-01" @default.
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- W2069731331 title "Effects of intra-ventrolateral periaqueductal grey palmitoylethanolamide on thermoceptive threshold and rostral ventromedial medulla cell activity" @default.
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- W2069731331 doi "https://doi.org/10.1016/j.ejphar.2011.11.034" @default.
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