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首页> 外文期刊>Neuron >Parallel 'pain' pathways arise from subpopulations of primary afferent nociceptor.
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Parallel 'pain' pathways arise from subpopulations of primary afferent nociceptor.

机译:平行的“疼痛”途径源自原发传入伤害感受器的亚群。

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A major unanswered question concerning "pain" circuitry is the extent to which different populations of primary afferent nociceptor engage the same or different ascending pathways. In the present study, we followed the transneuronal transport of a genetically expressed lectin tracer, wheat germ agglutinin, in Na(V)1.8-expressing nociceptors of the nonpeptide class. We found that interneurons of lamina II are at the origin of the major ascending circuits targeted by the nonpeptide nociceptors. These interneurons contact lamina V projection neurons, which in turn predominantly target fourth-order neurons in the amygdala, hypothalamus, bed nucleus of the stria terminalis, and to a remarkable extent, the globus pallidus. These circuits differ greatly from the lamina I-based projection that is targeted by the peptide class of nociceptors. Our results indicate that parallel, perhaps independent pain pathways arise from different nociceptor classes and that motor as well as limbic targets predominate in the circuits that originate from the nonpeptide population.
机译:关于“疼痛”回路的一个主要的未解决问题是,不同的原发传入感受器群体在多大程度上参与相同或不同的上升途径。在本研究中,我们跟踪了基因表达的凝集​​素示踪剂小麦胚芽凝集素在表达非肽类Na(V)1.8的伤害感受器中的跨神经元转运。我们发现层板II的中间神经元是非肽伤害感受器靶向的主要上升电路的起源。这些中间神经元接触层状V投射神经元,而层状V投射神经元又主要针对杏仁核,下丘脑,终末纹的床核以及显着程度的苍白球等四阶神经元。这些回路与伤害感受器的肽类所靶向的基于层状I的投影有很大不同。我们的结果表明,平行的,也许独立的疼痛途径是由不同的伤害感受器类别引起的,并且运动和边缘目标在源自非肽种群的回路中占主导地位。

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