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Trigeminal-Rostral Ventromedial Medulla circuitry is involved in orofacial hyperalgesia contralateral to tissue injury

机译:三叉神经-前腹内侧神经延髓回路参与组织损伤对侧的口面痛觉过敏

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摘要

BackgroundOur previous studies have shown that complete Freund’s adjuvant (CFA)-induced masseter inflammation and microinjection of the pro-inflammatory cytokine interleukin-1β (IL-1β) into the subnucleus interpolaris/subnucleus caudalis transition zone of the spinal trigeminal nucleus (Vi/Vc) can induce contralateral orofacial hyperalgesia in rat models. We have also shown that contralateral hyperalgesia is attenuated with a lesion of the rostral ventromedial medulla (RVM), a critical site of descending pain modulation. Here we investigated the involvement of the RVM-Vi/Vc circuitry in mediating contralateral orofacial hyperalgesia after an injection of CFA into the masseter muscle.
机译:背景我们以前的研究表明,完全的弗氏佐剂(CFA)诱导的咬肌炎症和将促炎性细胞因子白介素1β(IL-1β)显微注射到脊髓三叉神经核的极核下/尾核下核过渡区(Vi / Vc )可以在大鼠模型中引起对侧口面痛觉过敏。我们还显示,对侧痛觉过敏随着眼前腹侧延髓(RVM)的病变而减弱,RVM是降痛调节的关键部位。在这里,我们研究了RVM-Vi / Vc电路在将CFA注入咬肌后介导对侧口面痛觉过敏的作用。

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