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Abstract
This study examined the antinociceptive effects of seven imidazoline I2 receptor ligands in a rat warm water tail withdrawal procedure (46 and 50 °C). Agmatine, 2-BFI, phenyzoline, and diphenyzoline produced a significant antinociceptive activity at 46 °C. BU224, S22687, and idazoxan had no effect at 46 °C up to doses that altered the locomotor activity. None of the drugs showed antinociceptive activity at 50 °C. It is suggested that I2 receptor agonists have antinociceptive activity for acute phasic pain under weak noxious stimulus, and the effects are efficacy-dependent. These data explain the findings that I2 receptor agonists enhance the antinociceptive effects of opioids and support developing higher-efficacy I2 receptor agonists for the treatment of pain.
Published Version
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