BACKGROUND:The treatment of neuropathic pain is unsatisfactory at the present moment and the sigma 1 receptor has been identified as a new potential target for neuropathic pain. The aim of this study was to use an operant self-administration model to reveal the potential interest of a new sigma 1 receptor antagonist, S1RA, in chronic pain that was developed in mice by a partial ligation of the sciatic nerve. METHODS:Once that chronic pain had reached a steady state, mice were trained to maintain an operant behaviour to self-administer S1RA. The possible abuse liability of the analgesic compound was determined by evaluating operant self-administration in sham-operated mice. The influence of S1RA on the anhedonic state related to chronic pain was also evaluated by measuring the preference for palatable drink (2% sucrose solution) using a recently validated and highly sensitive behavioural device. RESULTS:Nerve-injured mice, but not sham-operated animals, acquired the operant responding to obtain S1RA (6 mg/kg/infusion). After 10 days of S1RA self-administration, neuropathic pain was significantly reduced in nerve-injured mice. In addition, an anhedonic state was revealed in nerve-injured mice by a decreased consumption of palatable drink, which was significantly attenuated by S1RA (25 mg/kg). CONCLUSIONS:These results reveal the analgesic efficacy of the sigma antagonist, S1RA, in neuropathic pain associated with an improvement of the emotional negative state and that was devoided of reinforcing effects. The operant responses evaluated in this new mouse model can have a high predictive value to estimate the clinical benefit/risk ratio of new analgesic compounds to treat chronic pain, such as S1RA.

译文

背景:目前对神经性疼痛的治疗还不能令人满意,sigma 1受体已被确定为神经性疼痛的新潜在靶标。这项研究的目的是使用一种有效的自我管理模型来揭示新型sigma 1受体拮抗剂S1RA在通过局部结扎坐骨神经引起的小鼠慢性疼痛中的潜在利益。
方法:一旦慢性疼痛达到稳定状态,就对小鼠进行训练以保持自我S1RA自我管理的操作行为。通过评估假手术小鼠的操作性自我给药来确定该镇痛剂可能的滥用责任。 S1RA对与慢性疼痛有关的性快感状态的影响也通过使用最近验证且高度敏感的行为设备测量对可口饮料(2%蔗糖溶液)的偏好来评估。
结果:神经损伤的小鼠获得了S1RA(6μg/ kg /输注)的反应,但没有假手术的动物。 S1RA自我给药10天后,神经损伤小鼠的神经性疼痛明显减轻。此外,减少可口饮料的摄入量可减轻神经损伤小鼠的快感状态,而S1RA(25μg/ kg)可以明显降低这种状态。
结论:这些结果揭示了西格玛拮抗剂S1RA在神经性疼痛中与情绪消极状态改善相关的镇痛效果,并且缺乏增强作用。在这种新的小鼠模型中评估的手术反应可以具有较高的预测价值,可以评估新型镇痛药(例如S1RA)的临床镇痛药的临床获益/风险比。

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