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Brain research bulletin · Jul 2007
Suppression by intrathecal BmK IT2 on rat spontaneous pain behaviors and spinal c-Fos expression induced by formalin.
- Zhan-Tao Bai, Tong Liu, Xue-Yan Pang, Zhi-Fang Chai, and Yong-Hua Ji.
- College of Life Sciences, Yanan University, Yanan 716000, PR China.
- Brain Res. Bull. 2007 Jul 12; 73 (4-6): 248-53.
AbstractThe central anti-nociception of BmK IT2, a sodium channel modulator from scorpion Buthus martensi Karsh (BmK) was investigated in this study. It was found that the formalin-induced rat spontaneous flinches and spinal c-Fos expression could be significantly suppressed by intrathecal BmK IT2 pre- or post-formalin injection in a dose-dependent manner. The time course of inhibitory effect exerted by intrathecal BmK IT2 on spontaneous flinches was longer in the pre-treatment group than in post-treatment group. This was consistent with the stronger suppression on spinal c-Fos expression exerted by intrathecal BmK IT2 pre-treatment. In addition, the suppression by intrathecal BmK IT2 on formalin-induced c-Fos expression in superficial laminae was more significant than that in deeper laminae. These results indicate that BmK IT2 can induce central anti-nociceptive response and might thus be a valuable molecular tool for the understanding of pain mechanisms.
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