Comparison of α-adrenoceptor involvement in the antinociceptive action of tizanidine and clonidine in the mouse

Tsutomu Kameyama, Toshitaka Nabeshima, Kiyoshi Matsuno, Akira Sugimoto

研究成果: Article査読

31 被引用数 (Scopus)

抄録

The effect of drugs that influence the opioidergic and monoaminergic neuronal systems on the antinociceptive action of tizanidine [5-chloro-4-(2-imidazolin-2-yl-amino)-2,1,3-benzothiodiazole] was compared with their effect on the action of clonidine. The potency of the clonidine-induced antinoceptive action was 1.83 and 7.75 times greater than that of tizanidine in the tail-flick and acetic acid-induced writhing tests, respectively. The action of tizanidine and clonidine was completely antagonized by pretreatment with yohimbine, an α2-adrenoceptor blocker, but not by prazosin, an α1-adrenoceptor blocker. Other α1-adrenoceptor blockers, phenoxybenzamine and phentolamine, also attenuated the action of tizanidine and clonidine but the potency of these drugs was less than that of yohimbine. An opioid antagonist (naloxone), drugs influencing the serotonergic neuronal system (p-chlorophenylalanine, 5,6-dihydroxytryptamine, cyproheptadine), drugs influencing the catecholaminergic system (α-methyl-p-tyrosine, diethyl-dithiocarbamate, 6-hydroxydopamine, haloperidol) showed no effect on the action of tizanidine and clonidine. From these results, it appears that α2-adrenoceptors might be of importance in mediating the tizanidine and clonidine antinociceptive action in the tail-flick test.

本文言語English
ページ(範囲)257-264
ページ数8
ジャーナルEuropean Journal of Pharmacology
125
2
DOI
出版ステータスPublished - 17-06-1986
外部発表はい

All Science Journal Classification (ASJC) codes

  • Pharmacology

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