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Effects of butorphanol on morphine-induced itch and analgesia in primates

Title
Effects of butorphanol on morphine-induced itch and analgesia in primates
Authors
Lee H.Naughton N.N.Woods J.H.Ko M.-C.
Ewha Authors
이희승
SCOPUS Author ID
이희승scopus
Issue Date
2007
Journal Title
Anesthesiology
ISSN
0003-3022JCR Link
Citation
vol. 107, no. 3, pp. 478 - 485
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
BACKGROUND: Butorphanol is an opioid analgesic with partial agonist actions at μ- and κ-opioid receptors (MOR and KOR). Previous studies have demonstrated that both MOR antagonists and KOR agonists are effective in alleviating intrathecal morphine-induced itch in primates. The aim of the study was to investigate the effectiveness of butorphanol as an antipruritic and to elucidate the receptor mechanisms underlying butorphanol's antipruritic effect in primates. METHODS: Adult rhesus monkeys were used in the behavioral assays for measuring itch/scratching and analgesia. The dose-response curves of butorphanol were studied using selective MOR and KOR antagonists. In addition, the effect of butorphanol as an antipruritic was studied on subcutaneous and intrathecal morphine-induced itch and analgesia. KOR-selective antagonists were further used to compare the degrees of MOR and KOR activation underlying the antipruritic effect of butorphanol. RESULTS: Butorphanol alone produced analgesia with slight itch responses, and both effects were blocked by a MOR antagonist, clocinnamox (0.1 mg/kg). In contrast, a KOR antagonist, 5′-guanidinylnaltrindole (1 mg/kg), increased butorphanol-elicited itch. Systemic butorphanol (0.0032-0.032 mg/kg) dose-dependently attenuated systemic or intrathecal morphine-induced itch. In addition, butorphanol either potentiated or maintained morphine-induced analgesia without producing sedation. KOR-selective antagonists, 5′-guanidinylnaltrindole (1 mg/kg) and nor-binaltorphimine (3.2 mg/kg), only partially reversed the antipruritic effect of butorphanol with different durations of KOR antagonism. CONCLUSIONS: Butorphanol is effective in attenuating systemic or spinal morphine-induced itch without reducing morphine analgesia. This study provides functional evidence that both partial MOR and KOR agonist actions contribute to the effectiveness of butorphanol as an antipruritic in primates. © 2007 American Society of Anesthesiologists, Inc.
DOI
10.1097/01.anes.0000278876.20263.a7
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의과대학 > 의학과 > Journal papers
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