电刺激大髓鞘传入神经抑制大鼠脊髓背角神经元对有害和无害皮肤刺激的反应

M. Tsuruoka, Yong-ning Wang, Y. Matsui
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引用次数: 1

摘要

研究了电刺激大髓鞘传入神经对脊髓背角神经元的抑制作用。用细胞外微电极记录了经硫胺钠麻醉的大鼠153个背角神经元对尾巴的有害加热或无害机械刺激(轻刷)的反应。在这些神经元中,45个是低阈值机械感受性神经元,47个是伤害特异性神经元,61个是宽动态范围神经元。在22.2%的LTM神经元中,对无害机械刺激的反应被施加于同侧后肢的大髓鞘传入神经5分钟的电刺激所抑制。这种条件刺激(大髓鞘传入神经刺激,LMAS)也抑制了19.2%的NS神经元的有害热反应。LMAS_对WDR神经元的抑制作用是非选择性的,对光刷和有害加热的反应均被抑制。在WDR神经元中,27.3%被LMAS抑制。这些结果表明LMAS对脊髓背角3类神经元均有抑制作用。
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Electrical Stimulation of Large Myelinated Afferents Inhibits Responses of Rat Spinal Dorsal Horn Neurons to Noxious and Innocuous Cutaneous Stimulation
The inhibitory effects of electrical stimulation of large myelinated afferents on_ spinal dorsal horn neurons were investigated. In rats anesthetized with thiamylal sodium,_ responses of 153 dorsal horn neurons to noxious heating or innocuous mechanical stimulation_ (light brushing) of the tail were recorded from the sacral and coccygeal levels of the spinal cord_ by extracellular microelectrodes. Of these neurons, 45 were low-threshold mechanoreceptive_ (LTM), 47 were nociceptive-specific (NS), and 61 were wide-dynamic-range (WDR) neurons_. In 22.2% of the LTM neurons, responses to innocuous mechanical stimulation were inhibited_ by electrical stimulation of large myelinated afferents applied to the ipsilateral hindlimb for_ 5 min. This conditioning stimulation (large myelinated afferent stimulation, LMAS) also inhibited noxious heat responses in 19.2% of the NS neurons. The inhibitory effect of LMAS_ on WDR neurons was nonselective in that both responses to light brushing and noxious heating were inhibited. Of the WDR neurons, 27.3 % were inhibited by LMAS. These results_ indicate that inhibition produced by LMAS is exerted on all 3 classes of spinal dorsal horn neu_ rons.
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