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    题名: Serotonin Receptor 5-HT(2B) Mediates Serotonin-Induced Mechanical Hyperalgesia
    作者: Lin,SY;Chang,WJ;Lin,CS;Huang,CY;Wang,HF;Sun,WH
    贡献者: 生命科學系
    关键词: DORSAL-ROOT GANGLION;FORMALIN-INDUCED NOCICEPTION;INFLAMMATORY MEDIATORS;PAIN;RAT;ACTIVATION;SENSITIZATION;SUBTYPE;MICE;5-HYDROXYTRYPTAMINE
    日期: 2011
    上传时间: 2012-03-27 18:11:23 (UTC+8)
    出版者: 國立中央大學
    摘要: Serotonin [5-hydroxytryptamine (5-HT)] released from mast cells or platelets in peripheral tissues is one of the important inflammatory mediators in pain and hyperalgesia. The involvement of 5-HT in pain is complex because it could inhibit or facilitate nociceptive transmission, reflecting the presence of multiple 5-HT subtype receptors on peripheral and central nociceptors. The present study aimed to investigate the involvement of 5-HT(2B) in 5-HT-induced pain and whether the subtype exists in dorsal root ganglion (DRG) neurons. Injecting the 5-HT or 5-HT(2) agonist in hindpaws of mice induced significant hyperalgesia to mechanical stimuli, which was inhibited by the 5-HT(2B/2C) antagonist but not by 5-HT(1A), 5-HT(2A), or 5-HT(3A) antagonists. Therefore, 5-HT(2B) or 5-HT(2C) may be involved in 5-HT-induced mechanical hyperalgesia. The 5-HT(2B/2C) antagonist also blocked 5-HT-induced transient [Ca(2+)] signaling in DRG neurons. All subtypes of 5-HT receptors except 5-HT(2C) and 5-HT(6) are present in DRGs. In situ hybridization also demonstrated 5-HT(2B) mainly expressed in small-to medium-diameter DRG neurons that respond to pain. Likely, 5-HT(2B) mediates 5-HT-induced mechanical hyperalgesia in mice.
    關聯: JOURNAL OF NEUROSCIENCE
    显示于类别:[生命科學系] 期刊論文

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