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We evaluated the ability of spinally administered 2-methyl-6-(phenylethynyl)-pyridine (MPEP), a selective antagonist of the metabotropic glutamate receptor subtype 5 (mGluR5), and 2-chloro-5-hydroxyphenylglycine (CHPG), an mGluR5 agonist, to modulate the antinociceptive action and tolerance of intrathecal (i.t.) morphine infusion in rats, and assessed the expression of spinal nitric oxide synthase...
Prolonged intrathecal (i.t.) administration of morphine results in tolerance to morphine-induced antinociception. We found that co-administration of selective metabotropic glutamate receptor subtype 5 antagonist MPEP with morphine could suppress the loss of morphine-induced antinociception and inhibit the development of tolerance to morphine-induced antinociceptive effect. Whereas, the specific metabotropic...
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