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. 2008;82(3):180-6.
doi: 10.1159/000151346. Epub 2008 Aug 14.

Magnesium ions and opioid agonist activity in streptozotocin-induced hyperalgesia

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Magnesium ions and opioid agonist activity in streptozotocin-induced hyperalgesia

Magdalena Bujalska et al. Pharmacology. 2008.

Abstract

Streptozotocin-induced hyperglycemia accompanied by a chronic decrease in the nociceptive threshold is considered a useful model of experimental hyperalgesia. We examined (1) the effect of the opioid receptor agonists and (2) the effect of the magnesium ions (Mg(2+)) on the antinociceptive action of opioid agonists in a diabetic neuropathic pain model. When administered alone, opioid agonists like morphine (5 mg/kg i.p.) and fentanyl (0.0625 mg/kg i.p.), as well as the partial agonist buprenorphine (0.075 mg/kg) had only little effect on streptozotocin-induced hyperalgesia. However, pretreatment with Mg(2+) at a dose of 40 mg magnesium sulfate/kg i.p. markedly enhanced the analgesic activity of all three investigated opioids. Practical aspects of co-administration of magnesium and opioids in diabetic neuropathy are discussed.

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