Activation of Gi induces mechanical hyperalgesia poststress or inflammation.

Activation of Gi induces mechanical hyperalgesia poststress or inflammation.
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Gi 的激活会诱发应激后机械痛觉过敏或炎症。

DOI:
10.1016/j.neuroscience.2009.03.001
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发表时间:
2009-05-05
期刊:
影响因子:
3.3
通讯作者:
Levine, J. D.
Levine, J. D.
中科院分区:
医学3区
文献类型:
--
作者:
Dina, O. A.;Khasar, S. G.;Gear, R. W.;Levine, J. D.

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在初级传入伤害感受器可塑性在从急性疼痛到慢性疼痛转变中的作用的研究中,我们最近报道,暴露于不可预测的声音应激或先前的炎症反应会引起伤害感受器第二信使信号通路的长期变化,介导炎症性痛觉过敏;这一变化涉及从 Gs-cAMP-PKA 信号通路到 Gi-PKC 信号通路的转变。为了更直接地研究 Gi 在机械痛觉过敏中的作用,我们评估了 Gi 激活剂 mastoparan 的伤害感受作用。在大鼠后爪皮内注射 mastoparan 可诱导剂量依赖性(0.1 ng – 1 μg)机械痛觉过敏。 Gi、百日咳毒素和蛋白激酶 C epsilon (PKCε) 的高选择性抑制剂 PKCεV1-2 均能显着减弱应激大鼠中 Mastoparan 诱导的痛觉过敏,但对未应激大鼠中 Mastoparan 诱导的痛觉过敏没有影响。从角叉菜胶引起的炎症恢复后,在伤害性测试部位观察到类似的效果。这些研究进一步证实了应激或炎症引起的原发性机械痛觉过敏中向 Gi 激活和 PKCε 依赖性信号通路的转变。
In studies of the role of primary afferent nociceptor plasticity in the transition from acute to chronic pain we recently reported that exposure to unpredictable sound stress or a prior inflammatory response induces long-term changes in the second messenger signaling pathway, in nociceptors, mediating inflammatory hyperalgesia; this change involves a switch from a Gs-cAMP-PKA to a Gi-PKC signaling pathway. To more directly study the role of Gi in mechanical hyperalgesia we evaluated the nociceptive effect of the Gi activator, mastoparan. Intradermal injection of mastoparan in the rat hind paw induces dose-dependent (0.1 ng – 1 μg) mechanical hyperalgesia. The highly selective inhibitor of Gi, Pertussis toxin, and of protein kinase C epsilon (PKCε), PKCεV1–2, both markedly attenuate mastoparan-induced hyperalgesia in stressed rats but had no effect on mastoparan-induced hyperalgesia in unstressed rats. Similar effects were observed, at the site of nociceptive testing, after recovery from carrageenan-induced inflammation. These studies provide further confirmation for a switch to a Gi-activated and PKCε-dependent signaling pathway in primary mechanical hyperalgesia, induced by stress or inflammation.
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