目的 探讨脉冲射频对坐骨神经慢性压迫模型大鼠背根神经节中降钙素基因相关肽(CGRP)表达的长期影响。方法 Sprague-Dawley大鼠36只随机分为假手术组(n=12)、模型组(n=12)和治疗组(n=12)。模型组和治疗组结扎坐骨神经,治疗组予脉冲射频治疗坐骨神经结扎部位120 s。治疗前及治疗后7 d、14 d、21 d、28 d测量缩足反射阈值(HWT),治疗后28 d取大鼠右L4-6背根神经节,采用RT-qPCR和ELISA方法检测CGRP表达。结果 治疗后治疗组大鼠HWT逐渐升高,7 d起即高于模型组(P<0.05),21 d、28 d与假手术组无显著性差异(P>0.05)。治疗组CGRP转录及翻译水平均明显低于模型组(P<0.01)。结论 脉冲射频治疗可长时间缓解神经病理性疼痛,可能与下调背根神经节中CGRP表达有关。
Objective To investigate the long-term effect of pulsed radiofrequency on the expression of calcitonin gene-related peptide (CGRP) in dorsal root ganglion of rats with chronic constriction injury. Methods A total of 36 Sprague-Dawley rats were randomly divided into sham group (n=12), model group (n=12) and treatment group (n=12). The sciatic nerve was ligated in the model group and the treatment group, and the treatment group was treated with pulsed radiofrequency on the injured nerve for 120 seconds. Hindpaw withdrawl threshold (HWT) was measured before treatment, and seven days, 14 days, 21 days and 28 days after treatment. After HWT, the right L4-6 dorsal root ganglions were tested the CGRP expression using RT-qPCR and ELISA. Results HWT gradually increased in the treatment group after treatment, and was higher than that in the model group since seven days after treatment (P<0.05), similar to that of the sham group 21 days and 28 days after treatment (P>0.05). The transcription and translation levels of CGRP were both significantly lower in the treatment group than in the model group (P<0.01).Conclusion Pulsed radiofrequency might relieve the neuropathic pain through reducing CGRP expression in dorsal root ganglion in a long term.
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