Conditioned place preference reveals tonic pain in an animal model of central pain.

Conditioned place preference reveals tonic pain in an animal model of central pain.
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DOI:
10.1016/j.jpain.2011.01.010
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发表时间:
2011-08
期刊:
The journal of pain
影响因子:
--
通讯作者:
Masri R
Masri R
中科院分区:
其他
文献类型:
--
作者:
Davoody L;Quiton RL;Lucas JM;Ji Y;Keller A;Masri R

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中枢性疼痛动物模型的一个局限性是它们无法概括人类状况的所有临床特征。具体来说,许多动物模型依赖于超敏反应的反射性测量,而忽略或无法评估自发性疼痛,这是人类中枢性疼痛的标志性特征。在这里,我们采用条件位置偏好范式来测试脊髓前外侧象限病变的动物是否出现与自发性疼痛一致的体征。这种模式依赖于这样一个事实,即疼痛缓解对动物是有益的,并且已经被用来证明周围神经损伤的动物会产生紧张性疼痛。通过使用通常用于治疗中枢性疼痛患者的两种镇痛治疗方法(可乐定输注和运动皮质刺激),我们证明了镇痛治疗对脊髓病变动物有益,但对假手术对照组无效。这些发现与脊髓损伤动物存在强直性疼痛的结论一致。
A limitation of animal models of central pain is their inability to recapitulate all clinical characteristics of the human condition. Specifically, many animal models rely on reflexive measures of hypersensitivity and ignore, or cannot assess spontaneous pain, the hallmark characteristic of central pain in humans. Here, we adopt a conditioned place preference paradigm to test if animals with lesions in the anterolateral quadrant of the spinal cord develop signs consistent with spontaneous pain. This paradigm relies on the fact that pain relief is rewarding to animals, and has been used previously to show that animals with peripheral nerve injury develop tonic pain. With the use of two analgesic treatments commonly used to treat patients with central pain (clonidine infusion and motor cortex stimulation), we demonstrate that analgesic treatments are rewarding to animals with spinal cord lesions but not sham operated controls. These findings are consistent with the conclusion that animals with spinal cord injury suffer from tonic pain.
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