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Are mechanical and cold allodynia in mononeuropathic and arthritic rats relieved by systemic treatment with calcitonin or guanethidine?

Abstract
The putative antinociceptive action of guanethidine and calcitonin systemically injected has been compared in 2 rat models of persistent experimental pain: Freund's adjuvant-induced arthritis (n = 29) and mononeuropathy induced by 4 loose ligatures around the sciatic nerve (n = 24). Guanethidine (30 mg/kg, i.v.) and calcitonin (0.125 mg, s.c.) were injected once a day over 1 week, when hyperalgesia was fully developed. The antinociceptive action was gauged using nociceptive tests based on mechanical or cold stimuli (vocalization threshold to paw pressure and struggle latency to 10 degrees C, respectively), and the score of spontaneous pain-related behavior was measured on the basis of the abnormal hind paw position. No antinociceptive action was observed in calcitonin-compared to saline-injected rats, either in arthritic or neuropathic animals. Guanethidine treatment was ineffective on hyperalgesia exhibited in arthritic rats but was able to reduce reliably and even suppress the abnormal reactions to cold stimulus in neuropathic animals. The lack of hypoalgesic action of calcitonin versus its beneficial action in bone repair, as well as the possible role(s) of the sympathetic system in neuropathic versus arthritic pain and in hyperalgesia versus physical signs of inflammation, are discussed.
AuthorsS Perrot, N Attal, D Ardid, G Guilbaud
JournalPain (Pain) Vol. 52 Issue 1 Pg. 41-47 (Jan 1993) ISSN: 0304-3959 [Print] United States
PMID8383311 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Anti-Inflammatory Agents, Non-Steroidal
  • Antidepressive Agents
  • Narcotics
  • Calcitonin
  • Guanethidine
Topics
  • Animals
  • Anti-Inflammatory Agents, Non-Steroidal (therapeutic use)
  • Antidepressive Agents (therapeutic use)
  • Arthritis, Experimental (complications)
  • Behavior, Animal (drug effects)
  • Calcitonin (therapeutic use)
  • Cold Temperature
  • Guanethidine (therapeutic use)
  • Immersion
  • Male
  • Narcotics (therapeutic use)
  • Pain (drug therapy, etiology)
  • Pain Threshold (drug effects)
  • Peripheral Nervous System Diseases (complications)
  • Physical Stimulation
  • Rats
  • Rats, Sprague-Dawley
  • Sciatic Nerve (physiology)
  • Vocalization, Animal (drug effects)

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