2018
DOI: 10.1097/wnr.0000000000000964
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Abstract: Repeated administration of morphine or orexin-A produces tolerance to their antinociceptive effects. We investigated the possible incidence of cross-tolerance between orexin-A and morphine. Adult male Sprague-Dawley rats (200-250 g) were used. Under deep anesthesia, a stereotaxic apparatus was used to implant a 23 G cannula into the lateral ventricle for an intracerebroventricular (ICV) microinjection. The antinociceptive effect of three different doses of orexin-A (5, 20, and 40 µM; dissolved in 5 µl sterile … Show more

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