International Journal of Oral Biology

The Korean Academy of Oral Biology (대한구강생물학회)
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The Intracisternal Administration of MEK Inhibitor Attenuates Mechanical and Cold Allodynia in a Rat Model of Compression of the Trigeminal Ganglion

  • Lee, Min-K. (Department of Oral Physiology, School of Dentistry, Kyungpook National University) ;
  • Yoon, Jeong-H. (Department of Oral Physiology, School of Dentistry, Kyungpook National University) ;
  • Park, Min-K. (Department of Oral Physiology, School of Dentistry, Kyungpook National University) ;
  • Yang, Gwi-Y. (Department of Oral Physiology, School of Dentistry, Kyungpook National University) ;
  • Won, Kyung-A. (Department of Oral Physiology, School of Dentistry, Kyungpook National University) ;
  • Park, Yoon-Yub (Department of Physiology, School of Medicine, Catholic University of Daegu) ;
  • Ahn, Dong-K. (Department of Oral Physiology, School of Dentistry, Kyungpook National University)
  • Received : 2010.08.04
  • Accepted : 2010.08.20
  • Published : 2010.09.30
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Abstract

The present study investigated the role of ERK in the onset of mechanical and cold allodynia in a rat model of compression of the trigeminal ganglion by examining changes in the air-puff thresholds and number of scratches following the intracisternal injection of PD98059, a MEK inhibitor. Male Sprague Dawley rats weighing between 250 and 260 g were used. Under anesthesia, the rats were mounted onto a stereotaxic frame and received 4% agar ($10\;{\mu}l$) solution to compress the trigeminal ganglion. In the control group, the animals were given a sham operation without the application of agar. Changes in behavior were examined at 3 days before and at 3, 7, 10, 14, 17, 21, 24, 30, and 40 days after surgery. Compression of the trigeminal ganglion significantly decreased the air-puff thresholds. Mechanical allodynia was established within 3 days and persisted over postoperative day 24. To evaluate cold allodynia, nociceptive scratching behavior was monitored after acetone application on the vibrissa pad of the rats. Compression of the trigeminal ganglion was found to produce significant cold allodynia, which persisted for more than 40 days after surgery. On postoperative day 14, the intracisternal administration of $1\;{\mu}g$ or $10\;{\mu}g$ of PD98059 in the rat model significantly decreased the air-puff thresholds on both the ipsilateral and contralateral side. The intracisternal administration of $10\;{\mu}g$ of PD98059 also significantly alleviated the cold allodynia, compared with the vehicle-treated group. These results suggest that central ERK plays an important role in the development of mechanical and cold allodynia in rats with compression of the trigeminal ganglion and that a targeted blockade of this pathway is a potential future treatment strategy for trigeminal neuralgia-like nociception.

Keywords

References

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