International Journal of Oral Biology

The Korean Academy of Oral Biology (대한구강생물학회)
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Peripheral metabotropic glutamate receptors differentially modulate mustard oil-induced craniofacial muscle pain in lightly anesthetized rats

  • Lee, Min-K. (Department of Oral Physiology and Institution of BrainKorea21, School of Dentistry, Kyungpook National University) ;
  • Yang, Gwi-Y. (Department of Oral Physiology and Institution of BrainKorea21, School of Dentistry, Kyungpook National University) ;
  • Ahn, Dong-K. (Department of Oral Physiology and Institution of BrainKorea21, School of Dentistry, Kyungpook National University)
  • Published : 2008.09.30
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Abstract

The present study investigated the role of peripheral group I, II, and III metabotropic glutamate receptors (mGluRs) in mustard oil (MO)-induced nociceptive response in the masseter muscles of lightly anesthetized rats. Experiments were carried out on male Sprague-Dawley rats weighing 300-350 gm. After initial anesthesia with sodium pentobarbital (40 mg/kg, i.p.), one femoral vein was cannulated and connected to an infusion pump for intravenous infusion of sodium pentobarbital. The rate of infusion was adjusted to provide a constant level of anesthesia. MO (30 ${\mu}L$) was injected into the mid-region of the left masseter muscle via a 30-gauge needle over 10 seconds. After 30 mL injection of 5, 10, 15, or 20% MO into the masseter muscle, total number of hindpaw-shaking behavior was monitored. Intramuscular administration of MO significantly produced hindpawshaking behavior in a dose-dependent manner, as compared with the vehicle (mineral oil)-treated group. Intramuscular pretreatment with 10 or 100 ng DHPG, a group I mGluRs agonist, enhanced MO-induced hindpaw-shaking behavior, while APDC (20 or 200 ${\mu}g$), a group II mGluRs agonist, or L-AP4 (2 ${\mu}g$), a group III mGluRs agonist, significantly reduced MO-induced nociceptive behavior. The antinociception, produced by group II or III mGluRs agonists, was abolished by pretreatment with LY341495, a group II mGluRs antagonist, or CPPG, a group III mGluRs antagonist, res-pectively. Based on these observations, peripheral mGluRs differentially modulated MO-induced nociceptive behavior response in the craniofacial muscle pain and peripheral group II and III mGluRs agonists could be used in treatment of craniofacial muscle nociception.

Keywords

References

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