三叉神经痛患者痛支中hNa_v1.8mRNA表达的变化及意义

Expression of hNa_v1.8 mRNA in affected nerves of patients with trigeminal neuralgia

目的:探讨hNav1.8在三叉神经痛(trigeminalneuralgia,TN)发病机制中的意义。方法:以6例原发性TN(Ⅲ支)经保守治疗无效患者的痛支(下牙槽神经)和非痛支(舌神经)为研究对象,以舌颌颈联合根治术患者耳大神经和上颌骨次全切除术患者眶下神经为阴性对照,以βactin为内参照,利用半定量RTPCR技术,研究河豚毒素不敏感型(tetrodotoxinresistant,TTXR)钠通道hNav1.8mRNA在TN患者痛支神经中表达水平的变化。结果:hNav1.8mRNA在TN患者痛支中的表达强度(1.233±0.324)明显高于非痛支(1.018±0.249),t=3.919,P=0.011。结论:hNav1.8mRNA在三叉神经痛支中的表达升高可能在TN的发病机制中发挥重要作用,对hNav1.

Objective:To study the role of tetrodotoxin-resistant(TTX-R)human sodium channel of hNa v1.8 mRNA in trigeminal neuralgia (TN). Methods:The samples of affected trigeminal division(inferior alveolar nerve) and non-affected division(lingual nerve) were surgically obtained from six idiopathic TN patients to whom the drug therapy was not effective.The expression of hNa v1.8 mRNA was assessed by semi-quantitative reverse transcription polymerase chain reaction (RT-PCR) with β-actin as an internal control. A sample of great auricular nerve (from a patient who had to accept the combined radical neck dissection with glossectomy and hemimandibulectomy) and a sample of infraorbital nerve (from a patient who had to accept subtotal resection of maxilla) were used as the negative controls. Resoults:The relative amount of hNa v1.8 mRNA in the affected trigeminal divisions(1.233±0.324) was higher than that in the non-affected divisions(1.018±0.249), t=3.919,P=0.011. Conclusion:The higher expression of hNa v1.8 mRNA in the affected nerves of TN patients may play an important role in TN.