Centre National de la Recherche Scientifique, Université de Strasbourg, Institut des Neurosciences Cellulaires et Intégratives, 67000 Strasbourg, France.
Friedrich Miescher Institute for Biomedical Research, 4058 Basel, Switzerland.
J Neurosci. 2018 Mar 21;38(12):3102-3115. doi: 10.1523/JNEUROSCI.3195-17.2018. Epub 2018 Feb 20.
Pain associates both sensory and emotional aversive components, and often leads to anxiety and depression when it becomes chronic. Here, we characterized, in a mouse model, the long-term development of these sensory and aversive components as well as anxiodepressive-like consequences of neuropathic pain and determined their electrophysiological impact on the anterior cingulate cortex (ACC, cortical areas 24a/24b). We show that these symptoms of neuropathic pain evolve and recover in different time courses following nerve injury in male mice. electrophysiological recordings evidence an increased firing rate and bursting activity within the ACC when anxiodepressive-like consequences developed, and this hyperactivity persists beyond the period of mechanical hypersensitivity. Whole-cell patch-clamp recordings also support ACC hyperactivity, as shown by increased excitatory postsynaptic transmission and contribution of NMDA receptors. Optogenetic inhibition of the ACC hyperactivity was sufficient to alleviate the aversive and anxiodepressive-like consequences of neuropathic pain, indicating that these consequences are underpinned by ACC hyperactivity. Chronic pain is frequently comorbid with mood disorders, such as anxiety and depression. It has been shown that it is possible to model this comorbidity in animal models by taking into consideration the time factor. In this study, we aimed at determining the dynamic of different components and consequences of chronic pain, and correlated them with electrophysiological alterations. By combining electrophysiological, optogenetic, and behavioral analyses in a mouse model of neuropathic pain, we show that the mechanical hypersensitivity, ongoing pain, anxiodepressive consequences, and their recoveries do not necessarily exhibit temporal synchrony during chronic pain processing, and that the hyperactivity of the anterior cingulate cortex is essential for driving the emotional impact of neuropathic pain.
疼痛与感觉和情感上的不愉快成分有关,当它变成慢性疼痛时,往往会导致焦虑和抑郁。在这里,我们在小鼠模型中描述了这些感觉和不愉快成分的长期发展,以及神经病理性疼痛的焦虑抑郁样后果,以及它们对扣带前皮质(ACC,皮质区 24a/24b)的电生理影响。我们表明,这些神经病理性疼痛症状在雄性小鼠神经损伤后会以不同的时间进程演变和恢复。电生理记录表明,当出现焦虑抑郁样后果时,ACC 中的放电率和爆发活动增加,这种过度活跃持续到机械性超敏反应期之外。全细胞膜片钳记录也支持 ACC 的过度活跃,表现为兴奋性突触后传递增加和 NMDA 受体的贡献。ACC 过度活跃的光遗传学抑制足以缓解神经病理性疼痛的不愉快和焦虑抑郁样后果,表明这些后果是由 ACC 过度活跃所支撑的。慢性疼痛常与情绪障碍如焦虑和抑郁共病。已经表明,通过考虑时间因素,在动物模型中可以模拟这种共病。在这项研究中,我们旨在确定慢性疼痛的不同成分和后果的动态,并将其与电生理改变相关联。通过在神经病理性疼痛的小鼠模型中结合电生理、光遗传学和行为分析,我们表明,机械性超敏反应、持续性疼痛、焦虑抑郁后果及其恢复在慢性疼痛处理过程中不一定具有时间同步性,而扣带前皮质的过度活跃对于驱动神经病理性疼痛的情绪影响是必要的。
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