Systemic galnon, a low-molecular weight galanin receptor agonist, reduces heat hyperalgesia in rats with nerve injury.

Eur J Pharmacol 2003 Dec;482(1-3):133-7

Department of Medical Laboratory Sciences and Technology, Division of Clinical Neurophysiology, Huddinge University Hospital, Karolinska Institutet, S-141 86 Stockholm, Sweden.

We have examined the effect of systemically administered galnon, a novel low-molecular weight agonist of galanin receptors, on neuropathic pain-like behaviors in rats after photochemically induced partial nerve injury. Galnon is a galanin receptor ligand with moderate affinity to spinal cord membranes (K(D) of 6+/-0.6 microM). While intraperitoneally applied galnon produced no significant effect on mechanical or cold hypersensitivity, it dose-dependently prolonged heat withdrawal latency in nerve-injured rats. The effect of galnon was more potent on the injured side which has significantly shorter latency than the contralateral side. The anti-hyperalgesic effect of galanon was prevented by intrathecal M35, a galanin receptor antagonist. No side effects, such as sedation or motor impairment, were seen following systemic galnon treatment at the doses used. It is concluded that systemic galnon alleviated heat-hyperalgesic response in rats with partial sciatic nerve injury. This effect was likely to be mediated by activation of spinal galanin receptors.

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http://dx.doi.org/10.1016/j.ejphar.2003.09.018DOI Listing
December 2003
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