Abstract:
:Itching is known as a commonly side effect of opioid administration. However, the relationship of opioid receptors to itching is unclear. In this study, we examined the effect of intradermal injection of morphine and fentanyl on the itching sensation. When injected intradermally into the rostral back of mice, morphine and fentanyl elicited scratching behavior. In addition, an opioid receptor antagonist, naloxone, and a peripherally restricted opioid receptor antagonist, naloxone methiodide, significantly suppressed morphine- and fentanyl-induced scratching behavior. Moreover, the morphine-induced scratching behavior was suppressed by histamine H(1) receptor antagonists, such as diphenhydramine, chlorpheniramine, epinastine and cetirizine. On the other hand, fentanyl-induced scratching behavior was not suppressed by histamine H(1) receptor antagonists. Additionally, scratching behavior induced by morphine and fentanyl were not suppressed by glucocorticoids (predonisolone and dexamethasone). In conclusion, opioid-induced itching may involve in peripheral opioid receptors. Moreover, histamine and arachidonic acid metabolites played no main role in opioid-induced scratching behavior.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Yamamoto A,Kuyama S,Kamei C,Sugimoto Ydoi
10.1016/j.ejphar.2009.10.066subject
Has Abstractpub_date
2010-02-10 00:00:00pages
162-6issue
1-3eissn
0014-2999issn
1879-0712pii
S0014-2999(09)00992-3journal_volume
627pub_type
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