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使用一种评估冷觉异常性疼痛的新方法——双板技术,对小鼠三种神经性疼痛模型进行比较。

Comparison of three models of neuropathic pain in mice using a new method to assess cold allodynia: the double plate technique.

作者信息

Walczak Jean-Sébastien, Beaulieu Pierre

机构信息

Department of Pharmacology, Université de Montréal, Canada.

出版信息

Neurosci Lett. 2006 May 22;399(3):240-4. doi: 10.1016/j.neulet.2006.01.058. Epub 2006 Feb 21.

Abstract

The recent identification of receptors sensitive to cold stimuli increased the significance of using mice to study cold allodynia, one of the important features of neuropathic pain. However, commonly used techniques (simple cold plate and acetone technique) may be inappropriate to study cold allodynia in mice because of problems of interpretation. We have developed a new method for assessing aversion to a cold non-noxious stimulus. It consists of calculating the time that mice spend on a non-noxious cold plate during their explorative behavior versus a thermoneutral one. We used three different models of neuropathic pain: chronic constriction injury of the sciatic nerve (CCI), partial sciatic nerve ligation (PSL) and chronic constriction of the saphenous nerve (CCS) with their respective sham groups and naive animals to assess the double plate in comparison to the acetone drop technique. All operated mice displayed cold allodynia with both methods. The response to acetone and the time spent on the cold plate were correlated (r=-0.93) and we also showed that the CCI mice were more sensitive to cold. Pharmacological validation of this technique showed that CCI induced cold allodynia was alleviated by gabapentin. In conclusion, the double plate technique provides a new, relevant method for assessing cold allodynia in mice. The advantages and drawbacks with the other techniques are discussed.

摘要

最近对冷刺激敏感受体的鉴定提高了利用小鼠研究冷痛觉过敏的重要性,冷痛觉过敏是神经性疼痛的重要特征之一。然而,由于存在解读问题,常用技术(简单冷板法和丙酮法)可能不适用于研究小鼠的冷痛觉过敏。我们开发了一种评估对冷非伤害性刺激厌恶的新方法。该方法包括计算小鼠在探索行为中在非伤害性冷板上与在热中性板上花费的时间。我们使用了三种不同的神经性疼痛模型:坐骨神经慢性缩窄损伤(CCI)、坐骨神经部分结扎(PSL)和隐神经慢性缩窄(CCS),并分别设置了假手术组和正常动物组,以将双板法与丙酮滴注法进行比较来评估。两种方法均显示所有手术小鼠都出现了冷痛觉过敏。对丙酮的反应与在冷板上花费的时间相关(r = -0.93),并且我们还表明CCI小鼠对冷更敏感。该技术的药理学验证表明,加巴喷丁可减轻CCI诱导的冷痛觉过敏。总之,双板法为评估小鼠冷痛觉过敏提供了一种新的、相关的方法。文中还讨论了其他技术的优缺点。

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