Acetic acid conditioning stimulus induces long-lasting antinociception of somatic inflammatory pain

被引:22
作者
Kurihara, T [1 ]
Nonaka, T [1 ]
Tanabe, T [1 ]
机构
[1] Tokyo Med & Dent Univ, Dept Pharmacol & Neurobiol, Grad Sch Med, CREST,Japan Sci & Technol Corp,Bunkyo Ku, Tokyo 1138519, Japan
关键词
antinociception; supraspinal analgesic mechanism; descending controls; counterirritation; acetic acid writhing test; formalin test; serotonin; 5-HT receptor; tryptophan hydroxylase; nonopioid analgesia;
D O I
10.1016/S0091-3057(03)00014-5
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
A wide variety of noxious stimuli are known to induce a powerful inhibition of pain sensation evoked at a remote region of the body. Here we show that an intraperitoneal acetic acid (AA) conditioning stimulus produces long-lasting inhibition of formalin-evoked somatic inflammatory pain behavior in mice. This novel long-lasting antinociception was completely blocked by the 5-hydroxytryptamine type 2A/2C (5-HT2A/2C) receptor antagonists, ketanserin and ritanserin, but not by the opioid receptor antagonist, naloxone, and alpha-adrenergic receptor antagonists, phentolamine and yohimbine. In contrast, the 5-HT3/4 receptor antagonist, tropisetron, significantly potentiated this long-lasting antinociception. The conditioning stimulus significantly upregulated the levels of both tryptophan hydroxylase immunoreactivity, in the medulla oblongata and the 5-HT2A/2C receptor mRNA level in the spinal cord. These results suggested that the visceral noxious stimulus caused a long-lasting augmentation of the serotonergic inhibitory system and downregulated the somatic inflammatory nociceptive transmission. (C) 2003 Elsevier Science Inc. All rights reserved.
引用
收藏
页码:841 / 849
页数:9
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