Abstract:
:We used the tail-flick response of rats to study the role of opioid receptors in illness-induced hyperalgesia. An intraperitoneal injection of lithium chloride (LiCl) produced hyperalgesia that was blocked in a dose-dependent manner by subcutaneous injection of the opioid antagonist naloxone. Neither hyperalgesia nor its blockade by naloxone were due to variations in tail-skin temperature induced by LiCl. Hyperalgesia was also blocked when opioid receptor antagonism was restricted to (a) the periphery, by intraperitoneal administration of the quaternary opioid receptor antagonist naloxone methiodide; (b) the brain, by intracerebroventricular microinjection of naloxone; or (c) the spinal cord, by intrathecal microinjection of naloxone. These results document a pain facilitatory role of opioid receptors in both the peripheral and central nervous systems and are discussed with reference to their analgesic and motivational functions.
journal_name
Behav Neuroscijournal_title
Behavioral neuroscienceauthors
McNally GP,Johnston IN,Westbrook RFdoi
10.1037//0735-7044.114.6.1183subject
Has Abstractpub_date
2000-12-01 00:00:00pages
1183-90issue
6eissn
0735-7044issn
1939-0084journal_volume
114pub_type
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journal_title:Behavioral neuroscience
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journal_title:Behavioral neuroscience
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journal_title:Behavioral neuroscience
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