γ-氨基丁酸A受体α1亚基信使核糖核酸在硝酸甘油偏头痛大鼠模型脑干及三叉神经组织中的表达变化

摘要

Objective To investigate the change of gamma-aminobutyric acid A (GABAA) receptor α1 subunit mRNA expression in nitroglycerin induced migraine rat model,thus suggesting the relationship between GABAA receptor and migraine.Methods Thirty adult female Sprague-Dawley (SD) rats were randomly divided into control group,migraine model group,sodium valproate-treated group,each of the last 2 groups was divided into the attacking group and intermission group.The model of migraine was established using Cristina method,once a week for 5 weeks.After the second injection,rats in sodium valproate-treated group were given sodium valproate(0.5 g/L,10 ml/kg) everyday,and those in control group and model group were given normal saline solution(10 ml/kg).After the fifth injection,at the second hour(attacking groups) or the fourth day(intermission groups and control group),reverse transcription-polymerase chain reaction was used to detect the expression level of GABAA receptor α1 mRNA in brainstem and trigeminal ganglion.Results The expression level of GABAA receptor α1 mRNA in modeling attacking group(1.50 ±0.13) was higher than any other group(control group:1.01 ±0.24,modeling intermission group:1.04 ±0.10,sodium valproate-treated attacking group:0.99 ± 0.22,sodium valproate-treated intermission group:0.72 ± 0.03),and it was significantly higher than modeling intermission group(x2 =9.490,P =0.009).There was no statistical difference between modeling group and any other group,and compared with control group,there was no statistical difference in sodium valproate-treated attacking group or intermission group.Conclusion The pathogenesis of migraine may be related to the expression level of GABAA receptor α1 mRNA.%目的 利用硝酸甘油所致偏头痛大鼠模型探讨γ-氨基丁酸A(GABAA)受体α1亚基mRNA在偏头痛大鼠脑干及三叉神经组织中的表达变化.方法 30只成年雌性SD大鼠按完全随机分组方法分为对照组、模型组和丙戊酸钠干预组,后两组又随机分发作期和间歇期两个亚组(每组各6只).模型组及丙戊酸钠干预组按Cristina法复制偏头痛大鼠模型(每周1次,连续5周),干预组于第2次造模后每天灌服0.5 g/L的丙戊酸钠2次,共10 mL/kg；对照组和模型组于第2次造模后每天灌服生理盐水2次,共10 ml/kg.第5次造模后用逆转录-聚合酶链反应法测定大鼠脑干及三叉神经组织中GABAA受体α1亚基mRNA的表达.结果 模型组发作期的GABAA受体α1亚基mRNA的表达(1.50±0.13)均高于其他各组(对照组1.01±0.24,模型组间歇期1.04±0.10,干预组发作期0.99±0.22,干预组间歇期0.72±0.03),但仅与模型组间歇期相比差异有统计学意义(x2=9.490,P =0.009)；模型组与对照组、干预组的发作期及间歇期相比差异无统计学意义,干预组的发作期及间歇期与对照组相比差异无统计学意义.结论 偏头痛的发生可能与GABAA受体α1亚基在mRNA水平的表达上调有关.