International Journal of Oral Biology

The Korean Academy of Oral Biology (대한구강생물학회)
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Compression of The Trigeminal Ganglion Enhances Nociceptive Behavior Produced by Formalin in The Orofacial Area of Rats

  • Yang, Gwi-Y. (Department of Oral Physiology, School of Dentistry, Kyungpook National University) ;
  • Park, Young-H. (Department of Oral Physiology, School of Dentistry, Kyungpook National University) ;
  • Lee, Min-K. (Department of Oral Physiology, School of Dentistry, Kyungpook National University) ;
  • Kim, Sung-K. (Department of Endodontics, School of Dentistry, Kyungpook National University) ;
  • Ahn, Dong K. (Department of Oral Physiology, School of Dentistry, Kyungpook National University)
  • Published : 2008.12.31
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Abstract

The present study investigated inflammatory hypersensitivity following compression of the trigeminal ganglion in rats. Experiments were carried out on male Sprague-Dawley rats weighing 250-260 g. Under anesthesia, rats were mounted on a stereotaxic frame and injected with $8{\mu}L$ of 4% agar solution through a stainless steel injector to compress the trigeminal ganglion. In the control group, rats underwent a sham operation without agar injection. Injection sites were examined with a light micrograph after compression of the trigeminal ganglion. Air-puff thresholds (mechanical allodynia) were evaluated 3 days before surgery and 3, 7, 10, 14, 17, 21, 24, 30, and 40 days after surgery. Air-puff thresholds significantly decreased after compression of the trigeminal ganglion. Mechanical allodynia was established within 3 days and remained strong over 24 days, returning to preoperative levels approximately 40 days following compression. After subcutaneous injection of 5% formalin ($50{\mu}L$) in the compression of the trigeminal ganglion-treated rats, nociceptive scratching behavior was recorded for 9 successive 5-min internals. Injection of formalin into the vibrissa pad significantly increased the number of scratches and duration of noxious behavioral responses in sham-treated rats. Noxious behavioral responses induced by subcutaneous formalin administration were significantly potentiated in rats with trigeminal ganglion compression. These findings suggest that compression of the trigeminal ganglion enhanced formalin-induced infla-mmatory pain in the orofacial area.

Keywords

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