Neuropathic Injury-Induced Plasticity of GABAergic System in Peripheral Sensory Ganglia.

Neuropathic Injury-Induced Plasticity of GABAergic System in Peripheral Sensory Ganglia.
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神经性损伤——诱发周围感觉神经节 GABA 能系统的可塑性

DOI:
10.3389/fphar.2021.702218
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发表时间:
2021
影响因子:
5.6
通讯作者:
Du X
Du X
中科院分区:
医学2区
文献类型:
--
作者:
Wang C;Hao H;He K;An Y;Pu Z;Gamper N;Zhang H;Du X

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GABA是哺乳动物中枢神经系统(CNS)的主要抑制性神经递质。脊髓背侧的抑制性GABAA通道是外周至中枢神经系统伤害性信息输入的守门人。这些脊椎抑制机制的减弱是慢性疼痛的一个标志。然而,最近的研究表明,外周感觉神经节内存在较早的GABA能“门”。本研究对神经病理性疼痛发生过程中背根神经节(DRG)内GABA相关蛋白的可塑性变化进行了系统研究。我们发现,慢性缩窄性损伤(CCI)引起大多数GABAA通道亚基和GABA产生酶谷氨酸脱羧酶的普遍下调,这与外周GABA能抑制的减弱是一致的。引人注目的是,α5 GAAA亚单位持续上调。体内α5亚单位的敲除可适度减轻神经病理性痛敏。我们的发现表明,虽然神经病理性疼痛的发展通常伴随着外周GABA能系统的减弱,但α5 GAAA亚单位可能具有独特的致痛作用,因此可能是一个新的治疗靶点。
GABA is a major inhibitory neurotransmitter in the mammalian central nervous system (CNS). Inhibitory GABAA channel circuits in the dorsal spinal cord are the gatekeepers of the nociceptive input from the periphery to the CNS. Weakening of these spinal inhibitory mechanisms is a hallmark of chronic pain. Yet, recent studies have suggested the existence of an earlier GABAergic “gate” within the peripheral sensory ganglia. In this study, we performed systematic investigation of plastic changes of the GABA-related proteins in the dorsal root ganglion (DRG) in the process of neuropathic pain development. We found that chronic constriction injury (CCI) induced general downregulation of most GABAA channel subunits and the GABA-producing enzyme, glutamate decarboxylase, consistent with the weakening of the GABAergic inhibition at the periphery. Strikingly, the α5 GABAA subunit was consistently upregulated. Knock-down of the α5 subunit in vivo moderately alleviated neuropathic hyperalgesia. Our findings suggest that while the development of neuropathic pain is generally accompanied by weakening of the peripheral GABAergic system, the α5 GABAA subunit may have a unique pro-algesic role and, hence, might represent a new therapeutic target.
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发表时间: 2014-12-04
期刊: Cell
影响因子: 64.5
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DOI: 10.1172/jci86812
发表时间: 2017-05-01
期刊: The Journal of clinical investigation
影响因子: --
作者:
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发表时间: 2018-02-15
期刊: The Journal of comparative neurology
影响因子: --
作者:
Llewellyn-Smith IJ;Basbaum AI;Bráz JM
通讯作者: Bráz JM
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DOI: 10.1016/j.pain.2014.08.025
发表时间: 2014-11
期刊: Pain
影响因子: 7.4
作者:
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DOI: 10.1172/jci41084
发表时间: 2010-04-01
影响因子: 15.9
作者:
Liu, Boyi;Linley, John E.;Gamper, Nikita
通讯作者: Gamper, Nikita