两种非甾体类抗炎药对清醒状态血管源性头痛模型大鼠颅内Fos表达的影响

Effects of NSAIDs on Fos expression in conscious rat model of vasculogenic headache

目的：通过观察血管源性头痛清醒动物模型中Fos阳性细胞在三叉神经节及三叉神经脊束核尾侧亚核的分布情况，明确两种非甾体类抗炎药NSAID对乙酰氨基酚及布洛芬在头痛控制中，在颅内特定区域的作用机理。方法30只雄性SD大鼠随机分为对照组（生理盐水组）、对乙酰氨基酚组、布洛芬组，每组给药后50 min分别给予频率为20 Hz、电流为3～5 mA和脉宽为0.25 ms的电刺激，刺激后给予大鼠灌注固定取脑，分别在颅内取三叉神经节及三叉神经脊束核尾侧亚核制作石蜡切片，进行免疫组织化学染色，利用Image J软件对阳性细胞进行计数统计。结果电刺激后盐水组与非甾体类药物组在双侧三叉神经节、三叉神经脊束核尾侧亚核Fos蛋白表达的差异具有显著统计学意义，对乙酰氨基酚组与布洛芬组在双侧三叉神经节、三叉神经脊束核尾侧亚核Fos蛋白表达未见统计学差异。结论给予非甾体类抗炎前后在双侧三叉神经节、三叉神经脊束核尾侧亚核的Fos表达的改变提示三叉神经节、三叉神经脊束核尾侧亚核参与了疼痛的传递和表达以及药物对疼痛控制的药理过程。

Objective To define the functional mechanisms of two NSAIDs , paracetamol and ibuprofen , in specif-ic brain regions in headache control by observing the distribution of Fos -immunoreactive neurons in trigeminal ganglia and trigeminal nucleus caudalis in conscious rat models of vasculogenic headache .Methods Thirty male Sprague-Dawley rats were randomly divided into three groups： control group （ saline group ） , acetaminophen group and ibuprofen group .Each rat was given electrical stimulation （ frequency 20 Hz, current 3-5 mA, pulse width 0.25 ms） at 50 minutes after injec-tion .The rats were killed and perfusion fixed after electrical stimulation .Trigeminal ganglia and trigeminal nucleus caudalis of the brains were taken out for paraffin sections and immunohistochemical staining , and Fos-immunoreactive neurons were counted under the Image J system .Results After electrical stimulation , there were significant differences of Fos protein expression in bilateral trigeminal ganglia and spinal trigeminal nucleus caudalis between the saline group and groups of non -steroidal anti-inflammatory drugs , but no significant difference of Fos protein expression in bilateral trigeminal ganglia and spinal trigeminal nucleus caudalis between the acetaminophen group and ibuprofen group .Conclusions The changes of Fos expression in bilateral trigeminal ganglia and spinal trigeminal nucleus caudalis after treatment with NSAIDs suggest that such structures participate in the pain transmission and expression and the pharmacology course of analgesic drugs .