右美托咪定在大鼠脊髓缺血再灌注损伤中的保护作用及机制研究(1)
摘 要:目的 探討右美托咪定对大鼠脊髓缺血/再灌注损伤的保护作用及PI3K/Akt传导通路在其中的作用。方法 30只成年雄性大鼠随机分为假手术组、模型组和右美托咪定治疗组,每组10只。建立大鼠脊髓缺血/再灌注损伤模型,对再灌注损伤后6 h、12 h、24 h、48 h实验大鼠后肢运动功能进行评分,检测缺血脊髓前角组织中P-AKT的表达水平及神经元的凋亡指数。结果 右美托咪定可改善脊髓缺血/再灌注损伤后实验大鼠的后肢运动功能(P<0.05);提高脊髓前角P-AKT的表达水平(P<0.05),抑制缺血/再灌注损伤所致的脊髓神经元的凋亡(P<0.05)。结论 右美托咪定对脊髓缺血/再灌注损伤有一定的保护作用,其机制可能与激活PI3K/Akt传导通路,从而抑制神经元的凋亡有关。
关键词:右美托咪定; 再灌注损伤;细胞凋亡;脊髓; PI3K/Akt
中图分类号:R614 文献标识码:A DOI:10.3969/j.issn.1006-1959.2018.07.022
, 百拇医药
文章编号:1006-1959(2018)07-0069-03
Protective Effects and Mechanism of Dexmedetomidine on Spinal Cord Ischemia-Reperfusion Injury in Rats
JIANG Ya-nan,LIANG Yong-xin,SHI Cai-feng,SUN Yi-xiao,LI Shao-na
(Department of Anesthesiology,Affiliated Hospital of Qingdao University,Qingdao 266003,Shandong,China)
Abstract:Objective To investigate the protective effect of dexmetomidine on spinal cord ischemia/reperfusion injury in rats and the role of PI3K/Akt pathway in it.Methods 30 adult male rats were randomly divided into the sham operation group,the model group and the right metomomidine treatment group,with 10 rats in each group.A rat model of spinal cord ischemia/reperfusion injury was established.The hindlimb motor function was scored at 6 h,12 h,24 h,and 48 h after reperfusion,and the expression of P-AKT in the anterior horn of ischemic spinal cord was detected.Levels and neuronal apoptosis index.Results Dexmedetomidine can improve the hindlimb motor function in rats after spinal cord ischemia/reperfusion injury(P<0.05),increase the expression level of P-AKT in the anterior horn of spinal cord(P<0.05),and inhibit the apoptosis of spinal cord neurons induced by ischemia/reperfusion(P<0.05). Conclusion Dexmedetomidine has a protective effect on spinal cord ischemia/reperfusion injury,and its mechanism may be related to activation of PI3K/Akt conduction pathway and inhibition of neuronal apoptosis.
, 百拇医药
Key words:Dexmetomidine;Reperfusion injury;Apoptosis;Spinal cord;PI3K/Akt
脊髓供血动脉本身疾患、主动脉手术、脊髓内显微外科手术均可引起脊髓缺血再灌注损伤(reperfusion injury,RI),一般预后较差,致残率很高。右美托咪定(DEX)是一种高选择性的α2肾上腺素受体激动剂,对中枢神经有很多作用,比如镇静、镇痛和麻醉药节俭作用。有研究表明DEX可以改善大鼠短暂缺血脑组织的损伤[1,2],其机制可能与抑制神经元凋亡有关[3]。本研究采用大鼠腹主动脉阻断建立脊髓RI模型,探讨右美托咪定对脊髓RI的保护作用及其机制,为临床应用提供实验依据。
1材料与方法
1.1一般材料 清洁级健康成年雄性Wistar大鼠30只,体质量250~300 g,由青岛市动物实验中心提供;盐酸右美托咪定为江苏新晨制药有限公司提供,(批号H20091256);P-AKT抗体由北京博奥森生物技术有限公司提供;原位细胞死亡检测试剂盒(TUNEL)由武汉博士德公司提供。
1.2方法
1.2.1 实验分组 随机分为3组, A 组:假手术组10例,打开腹腔将腹主动脉暴露,然后关闭腹腔;B组:模型组10例,阻断腹主动脉,30 min后,将腹主动脉开放再灌注; C组:DEX处理组10例,阻断腹主动脉,30 min后将腹主动脉开放再灌注,关闭腹膜前DEX (10 μg/kg)腹腔内注射。, http://www.100md.com(江亚楠 梁永新,施彩凤 孙一笑 李少娜)
关键词:右美托咪定; 再灌注损伤;细胞凋亡;脊髓; PI3K/Akt
中图分类号:R614 文献标识码:A DOI:10.3969/j.issn.1006-1959.2018.07.022
, 百拇医药
文章编号:1006-1959(2018)07-0069-03
Protective Effects and Mechanism of Dexmedetomidine on Spinal Cord Ischemia-Reperfusion Injury in Rats
JIANG Ya-nan,LIANG Yong-xin,SHI Cai-feng,SUN Yi-xiao,LI Shao-na
(Department of Anesthesiology,Affiliated Hospital of Qingdao University,Qingdao 266003,Shandong,China)
Abstract:Objective To investigate the protective effect of dexmetomidine on spinal cord ischemia/reperfusion injury in rats and the role of PI3K/Akt pathway in it.Methods 30 adult male rats were randomly divided into the sham operation group,the model group and the right metomomidine treatment group,with 10 rats in each group.A rat model of spinal cord ischemia/reperfusion injury was established.The hindlimb motor function was scored at 6 h,12 h,24 h,and 48 h after reperfusion,and the expression of P-AKT in the anterior horn of ischemic spinal cord was detected.Levels and neuronal apoptosis index.Results Dexmedetomidine can improve the hindlimb motor function in rats after spinal cord ischemia/reperfusion injury(P<0.05),increase the expression level of P-AKT in the anterior horn of spinal cord(P<0.05),and inhibit the apoptosis of spinal cord neurons induced by ischemia/reperfusion(P<0.05). Conclusion Dexmedetomidine has a protective effect on spinal cord ischemia/reperfusion injury,and its mechanism may be related to activation of PI3K/Akt conduction pathway and inhibition of neuronal apoptosis.
, 百拇医药
Key words:Dexmetomidine;Reperfusion injury;Apoptosis;Spinal cord;PI3K/Akt
脊髓供血动脉本身疾患、主动脉手术、脊髓内显微外科手术均可引起脊髓缺血再灌注损伤(reperfusion injury,RI),一般预后较差,致残率很高。右美托咪定(DEX)是一种高选择性的α2肾上腺素受体激动剂,对中枢神经有很多作用,比如镇静、镇痛和麻醉药节俭作用。有研究表明DEX可以改善大鼠短暂缺血脑组织的损伤[1,2],其机制可能与抑制神经元凋亡有关[3]。本研究采用大鼠腹主动脉阻断建立脊髓RI模型,探讨右美托咪定对脊髓RI的保护作用及其机制,为临床应用提供实验依据。
1材料与方法
1.1一般材料 清洁级健康成年雄性Wistar大鼠30只,体质量250~300 g,由青岛市动物实验中心提供;盐酸右美托咪定为江苏新晨制药有限公司提供,(批号H20091256);P-AKT抗体由北京博奥森生物技术有限公司提供;原位细胞死亡检测试剂盒(TUNEL)由武汉博士德公司提供。
1.2方法
1.2.1 实验分组 随机分为3组, A 组:假手术组10例,打开腹腔将腹主动脉暴露,然后关闭腹腔;B组:模型组10例,阻断腹主动脉,30 min后,将腹主动脉开放再灌注; C组:DEX处理组10例,阻断腹主动脉,30 min后将腹主动脉开放再灌注,关闭腹膜前DEX (10 μg/kg)腹腔内注射。, http://www.100md.com(江亚楠 梁永新,施彩凤 孙一笑 李少娜)