Activation of Gi induces mechanical hyperalgesia poststress or inflammation.
Activation of Gi induces mechanical hyperalgesia poststress or inflammation.
复制标题
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.
中科院分区:
文献类型:
--
作者:
Dina, O. A.;Khasar, S. G.;Gear, R. W.;Levine, J. D.
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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