胆碱能抗炎通路在右美托咪定预先给药减轻肠缺血再灌注大鼠急性肺损伤中的作用  

Role of cholinergic anti-inflammatory pathway in dexmedetomidine pretreatment-induced reduction of acute lung injury in a rat model of intestinal ischemia-reperfusion

作　　者：刘薇 严虹[1] 陈璟莉[1] 任凌云 付泉源 段吉安[1] 胡年春[1] Liu Wei;Yan Hong;Chen Jingli;Ren Lingyun;Fu Quanyuan;Duan Ji'an;Hu Nianchun(Department of Anesthesiology,Central Hospital of Wuhan,Tongji Medical College,Huazhong University of Science and Technology,Wuhan 430014,China)

机构地区：[1]华中科技大学同济医学院附属武汉中心医院麻醉科,430014

出　　处：《中华麻醉学杂志》2018年第8期1005-1008,共4页Chinese Journal of Anesthesiology

基　　金：湖北省自然科学基金(2018CFC807).

摘　　要：目的 评价胆碱能抗炎通路在右美托咪定预先给药减轻肠缺血再灌注大鼠急性肺损伤中的作用.方法 健康雄性SD大鼠24只,2~3月龄,体重200~250 g,采用随机数字表法分为4组(n=6):假手术组(S组)、肠缺血再灌注组(II∕R组)、右美托咪定组(DEX组)和α7烟碱型乙酰胆碱受体拮抗剂α-银环蛇毒素组(α-BGT组).采用夹闭肠系膜上动脉60 min再灌注120 min的方法制备肠缺血再灌注损伤模型.DEX组和α-BGT组术前1 h尾静脉输注右美托咪定5μg·kg^-1·h^-1;α-BGT组给予右美托咪定前15 min腹腔注射α-BGT 1μg∕kg.于再灌注120 min时处死,取肺组织,光镜下观察病理学结果,测定湿重∕干重(W∕D)比值,采用ELISA法检测TNF-α和IL-6含量,采用硫代巴比妥酸法检测MDA含量,采用黄嘌呤氧化酶法检测SOD活性.结果 与S组比较,II∕R组和α-BGT组W∕D比值、MDA、TNF-α和IL-6含量升高,SOD活性降低,DEX组TNF-α 和IL-6含量升高(P<0.05);与II∕R组比较,DEX组W∕D比值、MDA、TNF-α 和IL-6含量降低,SOD活性升高(P<0.05),病理学损伤减轻;与DEX组比较,α-BGT组W∕D比值、MDA、TNF-α和IL-6含量升高,SOD活性降低(P<0.05),病理学损伤加重.结论 胆碱能抗炎通路激活后参与了右美托咪定预先给药减轻肠缺血再灌注大鼠急性肺损伤的机制.Objective To evaluate the role of cholinergic anti-inflammatory pathway in dexmedeto-midine pretreatment-induced reduction of acute lung injury in a rat model of intestinal ischemia-reperfusion (Ⅰ∕R) . Methods Twenty-four healthy male Sprague-Dawley rats, aged 2-3 months, weighing 200-250 g, were divided into 4 groups ( n=6) using a random number table method: sham operation group ( S group) , intestinal I∕R group ( Ⅱ∕R group ) , dexmetomidine group ( DEX group) and α7 nicotinic acetyl-choline receptor antagonistα-bungarotoxin (α-BGT) group (α-BGT group) . Intestinal I∕R was produced by occlusion of the superior mesenteric artery ( SMA) for 60 min followed by 120 min of reperfusion in anesthe-tized rats. Dexmetomidine 5 μg·kg^-1 ·h^-1 was injected via the tail vein at 1 h before operation in DEX group andα-BGT group. α-BGT 1μg∕kg was intraperitoneally injected at 15 min before dexmetomidine in-jection in α-BGT group. Rats were sacrificed at 120 min of reperfusion, and lung tissues were obtained for microscopic examination of pathological changes ( with a light microscope) and for determination of wet∕dry&nbsp;weight ratio ( W∕D ratio) , tumor necrosis factor-alpha ( TNF-α) and interleukin-6 ( IL-6) contents ( using enzyme-linked immunosorbent assay) , malondialdehyde ( MDA) content ( using thiobarbital acid method) and superoxide dismutase ( SOD) activity ( by xanthine oxidase method) . Results Compared with group S, the W∕D ratio and contents of MDA, TNF-αand IL-6 were significantly increased, and the SOD activi-ty was decreased in II∕R and α-BGT groups, and TNF-α and IL-6 contents were significantly increased in group DEX ( P<0. 05) . Compared with group Ⅱ∕R, the W∕D ratio and contents of MDA, TNF-αand IL-6 were significantly decreased, SOD activity was increased (P<0. 05), and the pathological changes were significantly attenuated in group DEX. Compared with group DEX, the W∕D ratio and contents of MDA, TNF-α and IL-6 were significantly increased, SOD activity was

关 键 词：乙酰胆碱 右美托咪啶 再灌注损伤 肠 呼吸窘迫综合征 成人 

分 类 号：R614[医药卫生—麻醉学]