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Role of serotonin and noradrenaline in the acute itch processing in mice.

The contribution of serotonin and noradrenaline to the modulation of pruriceptive processing was evaluated by administrating antidepressants or noradrenaline reuptake inhibitors. The pretreatment with milnacipran, a serotonin and noradrenaline reuptake inhibitor, and mirtazapine, a noradrenergic and specific serotonergic antidepressant, attenuated the induction of scratching behavior by chloroquine, a representative pruritogen, indicating the involvement of serotonin and/or noradrenaline in the modulation of pruriceptive processing. By contrast, the single administration of noradrenaline reuptake inhibitor such as atomoxetine and nisoxetine or serotonin reuptake inhibitor such as fluvoxamine and escitalopram had little effect on chloroquine-induced scratching, whereas the induction of scratching behavior by chloroquine was significantly ameliorated by co-administration of serotonin reuptake inhibitors and noradrenaline reuptake inhibitors. These results indicate that the simultaneous increases of serotonin and noradrenaline elicit the attenuating effect on pruriceptive processing induced by acute itch, and may also play a crucial role in the descending itch inhibitory system.

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