Gq rather than G11 preferentially mediates nociceptor sensitization.

Gq rather than G11 preferentially mediates nociceptor sensitization.
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DOI:
10.1186/1744-8069-9-54
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发表时间:
2013-10-25
期刊:
影响因子:
3.3
通讯作者:
Tappe-Theodor A
Tappe-Theodor A
中科院分区:
医学3区
文献类型:
--
作者:
Wirotanseng LN;Kuner R;Tappe-Theodor A

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GQ/11-蛋白信号转导机制在整个神经系统中都是必不可少的,但对单个G-蛋白GPCR信号分支在伤害性感受器激活中的作用以及它们在伤害性感受器敏化中的具体作用还知之甚少。我们的目的是揭示GQ/11信号通路通过不同的G蛋白GPCRs通过不同的经典炎症介质信号转导对伤害性感受器激活的贡献,并研究单独的GQ和G11G蛋白在伤害性感受器中的具体作用。使用不同的转基因小鼠,在初级伤害性神经元中缺失G蛋白的G蛋白亚基GαQ、Gα11或两者,我们分析了在炎症条件下起重要作用的不同的α激动剂(如三磷酸腺苷、谷氨酸、5-羟色胺等)对机械和热的敏感性。我们发现Gq/11-GPCR信号分支在机械性痛觉过敏的表现中起主要作用,在热痛觉过敏的发展中起次要作用。此外,关于这里使用的介质,GQ-蛋白是伤害性神经元中导致伤害性感受器敏化的GQ/11-蛋白家族中的主要G-蛋白。我们的结果表明,GQ/11信号分支在经典的GPCR配体刺激下的伤害性感受器敏化中起主要作用,在机械性痛觉过敏的发生中起主要作用。此外,单个G蛋白的缺失导致了GQ蛋白在伤害性神经元中主导GQ/11家族G蛋白的信号机制。
The Gq/11-protein signaling mechanism is essential throughout the nervous system, but little is known about the contribution of the individual G-protein GPCR signaling branches towards nociceptor activation and their specific role on nociceptor sensitization. We aimed to unravel the contribution of the Gq/11-signaling pathway towards nociceptor activation via a variety of classical inflammatory mediators signalling via different G-protein GPCRs and investigated the specific contribution of the individual Gq and G11 G-Proteins in nociceptors. Using different transgenic mouse lines, lacking Gαq, Gα11 or both α-subunit of the G-proteins in primary nociceptive neurons, we analyzed the mechanical- and heat-sensitivity upon application of different GPCR-agonists that are known to play an important role under inflammatory conditions (e.g. ATP, Glutamate, Serotonin etc.). We found that the Gq/11-GPCR signaling branch constitutes a primary role in the manifestation of mechanical allodynia and a minor role in the development of thermal hyperalgesia. Moreover, with respect to the mediators used here, the Gq-protein is the principle G-protein among the Gq/11-protein family in nociceptive neurons leading to nociceptor sensitization. Our results demonstrate that the Gq/11 signaling branch plays a primary role in nociceptor sensitization upon stimulation with classical GPCR ligands, contributing primarily towards the development of mechanically allodynia. Moreover, the deletion of the individual G-proteins led to the finding that the Gq-protein dominates the signalling machinery of the Gq/11 family of G-proteins in nociceptive neurons.
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