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Effect of spinal glutamate transporter 1 on chronic constriction injury of sciatic nerve and morphine tolerance of rats
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- Author:
- No author available
- Journal Title:
- ACTA PHARMACEUTICA SINICA
- Issue:
- 6
- DOI:
- 10.3321/j.issn:0513-4870.2009.06.005
- Key Word:
- 谷氨酸转运体;神经源性痛;吗啡耐受;头孢曲松钠
Abstract： 为了探讨脊髓谷氨酸转运体1(GLT-1)的表达量和活性状态与吗啡耐受和神经源性痛的关系,利用大鼠坐骨神经慢性压迫损伤(CCI)模型,以机械性缩足痛阈值(MWT)为评估指标,谷氨酸转运体激动剂β内酰胺类抗生素头孢曲松钠为工具药,观察对大鼠机械痛敏和吗啡耐受的影响;以实时定量PCR及Western blotting 考察脊髓GLT-1表达水平的变化.结果表明,CCI大鼠在术后1周与对照组相比MWT值下降约80%;CCI大鼠单独使用吗啡产生快速耐受,给药第3天与CCI模型对照组大鼠比较MWT值已无明显差异,脊髓GLT-1表达也明显下调;单独使用头孢曲松钠对痛敏有改善作用,脊髓GLT-1表达明显上调;吗啡伴随头孢曲松钠给药组耐受速度明显减慢,给药6天后MWT值仍保持在较高水平,与CCI吗啡耐受组比较有显著性差异,GLT-1表达明显上调.因此,脊髓GLT-1活性变化与神经源性痛及吗啡耐受的形成密切相关,促进GLT-1功能可显著延缓吗啡耐受与痛敏形成.
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