Anesth Analg:ET-1诱导的肢体对侧痛觉过敏的机制

2015-08-21 张森 译 MedSci原创

脊髓和大脑的中枢敏化,可能致在一侧肢体损伤后,出现对侧痛觉过敏的现象。以往的研究发现,在向大鼠一侧后爪注射内皮素-1(ET-1)后,可诱导其对侧后爪出现持久的机械与化学敏化。在本次研究中,我们对上述过程中的对侧传出活动的作用进行了探讨。   研究人员在大鼠右侧(同侧)后爪(ILP)跖面皮下注射ET-1(2nmol,10μl),分别对大鼠出现痛收缩反应时的热反应潜伏期及机械阈值进行测定

脊髓和大脑的中枢敏化,可能致在一侧肢体损伤后,出现对侧痛觉过敏的现象。以往的研究发现,在向大鼠一侧后爪注射内皮素-1(ET-1)后,可诱导其对侧后爪出现持久的机械与化学敏化。在本次研究中,我们对上述过程中的对侧传出活动的作用进行了探讨。

研究人员在大鼠右侧(同侧)后爪(ILP)跖面皮下注射ET-1(2nmol,10μl),分别对大鼠出现痛收缩反应时的热反应潜伏期及机械阈值进行测定,同时使用足底热辐射及von Frey 纤维丝测痛仪对ILP与对侧后爪( CLP)进行检测。在注射ET-1 30min前,通过直接注射布比卡因(0.25%,40μl)给予两侧后爪持续60min的麻醉;或者在注射ET-1 30min前,通过皮下注射布比卡因缓释微球阻滞同侧坐骨神经6-12小时。通过在颈部中线进行皮下注射,模拟这些布比卡因制剂的全身作用。

结果表明,在注射ET-1后2h, ILP和CLP的机械阈值都开始降低,约在24h达到最低,48h开始恢复,在72小时回到注射前的水平。在注射ET-1前向同侧后爪注射布比卡因可抑制这些过敏反应。同时CLP布比卡因注射在所有的测试时间点均出现了CLP敏化的抑制,而ILP除了在第二个小时敏化增加,其余时间点亦出现敏化抑制。在对侧坐骨神经被布比卡因缓释微球阻滞时,发生与上述情况相同的改变。

ET-1注射后,ILP和CLP均出现热敏化,反应模式与上述机械阈值相同。

 

这些结果表明通过对侧神经传递到后爪的传出通路,对ET-1诱导的对侧痛觉过敏是至关重要的,表明远端神经末梢的递质释放与上述过程相关。外周递质的释放是ET-1诱导的对侧痛觉过敏的关键,同时也可能导致继发性痛觉过敏,同时上述现象易发生于手术及神经损伤后并且远离原发性损伤的部位。

原始出处:

Gary R. Strichartz,Alla Khodorova,Jeffrey Chi-Fei Wang,Yu-Wen Chen,and Chuan-Chin Huang Contralateral Hyperalgesia from Injection of Endothelin-1 into the Ipsilateral Paw Requires Efferent Conduction into the Contralateral Paw. Anesth Analg. 2015 Jul 27

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    2016-09-15 1e10c84am36(暂无匿称)

    文章不错,值得拜读

    0

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    2015-12-31 AspirantSuo
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    2016-06-14 经常头晕
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    2015-08-25 快乐晴天

    好文

    0