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- W1964097712 abstract "Placebos are known to induce analgesia through the activation of μ-opioid receptors in some circumstances, such as after morphine pre-conditioning, an effect that is blocked by opioid antagonists. On the basis of the anti-opioid action of cholecystokinin, here we tested whether the activation of the cholecystokinin type-2 receptors abolishes opioid-induced placebo responses. The activation of the cholecystokinin type-2 receptors was performed by means of the agonist pentagastrin, and placebo responses were obtained after morphine pre-conditioning in an experimental human model of pain (tourniquet technique). Opioid-induced placebo responses were completely disrupted by pentagastrin administration. In addition, a high correlation between the response to morphine and the response to placebo was found, and this correlation was completely abolished by pentagastrin. These results show that the cholecystokinin-2 receptor agonist, pentagastrin, has the same effect as the μ-opioid receptor antagonist, naloxone, on placebo analgesia induced by morphine pre-conditioning, which suggests that the balance between cholecystokinergic and opioidergic systems is crucial in placebo responsiveness in pain. These findings also suggest that cholecystokinin type-2 receptor hyperactivity might be present in placebo non-responders." @default.
- W1964097712 created "2016-06-24" @default.
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- W1964097712 date "2010-10-08" @default.
- W1964097712 modified "2023-10-17" @default.
- W1964097712 title "Disruption of opioid-induced placebo responses by activation of cholecystokinin type-2 receptors" @default.
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- W1964097712 doi "https://doi.org/10.1007/s00213-010-2037-y" @default.
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