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出 处:《中国疼痛医学杂志》2012年第12期739-741,745,共4页Chinese Journal of Pain Medicine
摘 要:目的:观察骨癌痛小鼠前扣带回(anterior cingulate cortex,ACC)和脊髓中的N-甲基-D-天冬氨酸(N-methyl-D-aspartic acid receptor,NMDA)受体2B亚基(NR2B mRNA)表达含量的变化。方法:选用C57BL/6小鼠75只,随机分为癌痛组、假手术组、正常对照组。骨癌痛组接种肺癌细胞约2×106个;假手术组接种等容积的d-hanks液;正常对照组不予任何处理。分别于术后第6 d、10 d、14 d、18 d和22 d测定机械性触诱发痛,取前扣带回和L4~6段脊髓用于做实时定量PCR检测NR2B mRNA的表达。结果:①骨癌痛组于术后第10 d^22 d出现触诱发痛,机械缩足阈值低于对照组和假手术组(p<0.05)。②实时定量PCR显示:术后第14 d、18 d,骨癌痛组前扣带回NR2BmRNA的表达明显高于对照组和假手术组(p<0.05);术后第10 d、14 d、18 d,22 d,骨癌痛组于脊髓NR2B mRNA的表达明显高于对照组和假手术组(p<0.05);而术后第10 d、14 d、18 d,22 d,假手术组与正常组脊髓和前扣带回NR2B的差异无统计学意义(p>0.05)。结论:骨癌痛组脊髓和前扣带回中的NR2B mRNA含量表达上调,提示在骨癌痛的产生和维持中不仅激活脊髓低位中枢,而且有脑部中枢的参与。Objective: To investigate the expression of NR2B mRNA in the anterior cingulate cortex (ACC) and L4-6 spinal cord in the bone cancer pain mice. Methods: 75 adult male C57BL/6 mice were randomly and assigned into three groups (n = 5): bone cancer pain group (group C); sham-operated group (group O); normal control group (group N). On postoperative 6 d, 10 d, 14 d, 18 d and 22 d after operation, the mechanical allodynia and the expression of NR2B mRNA in the L4-6 spinal cord and ACC were evaluated with the mechanical pain threshold and fluorescence quantitative RT-PCR respectively. Results: Compared with group O and group N, mechanical pain threshold in group C was decreased at 10 d, 14 d, 18 d and 22 d after operation (P 〈 0.05). Compared with group O and group N, the expression of NR2B mRNA in ACC was increased at 14 d and 18 d after operation (P 〈 0.05). Compared with group O and group N, the expression of NR2B mRNA in L4-6 spinal cord was increased at 10 d, 14 d, 18 d and 22 d after operation (P 〈 0.05). Conclusion: The expressions of NR2B mRNA in ACC and L4-6 spinal cord are increased in bone cancer pain mice. These suggest that the generation and maintenance of bone cancer pain is related to both the spinal cord and the ACC.
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