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Mechanism of the antinociceptive action of mesaconitine: participation of brain stem and lumbar enlargement
Author(s) -
Hikino Hiroshi,
Murayama Mitsuo
Publication year - 1985
Publication title -
british journal of pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.432
H-Index - 211
eISSN - 1476-5381
pISSN - 0007-1188
DOI - 10.1111/j.1476-5381.1985.tb10551.x
Subject(s) - nociception , neuroscience , medicine , mechanism (biology) , mechanism of action , pharmacology , action (physics) , bioinformatics , chemistry , biology , receptor , biochemistry , in vitro , philosophy , physics , epistemology , quantum mechanics
1 The antinociceptive action of mesaconitine (MA) microinjected into the nucleus reticularis gigantocellularis (NRGC), the nucleus reticularis paragigantocellularis (NRPG), the periaqueductal gray (PAG) or the lumbar enlargement was investigated in rats by use of the tail immersion test. In addition, the effects of β‐adrenoceptor antagonists and an α‐adrenoceptor antagonist administered intrathecally (i.t.) on the antinociceptive action of MA given into the NRPG were also examined by the tail immersion test. 2 MA (50, 100 ng per rat) microinjected into the NRGC, the NRPG, the PAG and the lumbar enlargement increased the response latency in rats in a dose‐dependent fashion. MA (50 ng per rat) microinjected into neighbouring sites, the nucleus reticularis parvocellularis, the nucleus originis nervi abducentis and the fasciculus longitudinalis medialis, elicited no significant effect. 3 Intrathecally administered propranolol (1 and 5 μg per rat), atenolol (1 and 5 μg per rat) and IPS‐339 (1 and 5 μg per rat) remarkably inhibited the increase of the response latency induced by MA (50 ng per rat) given into the NRPG. 4 Intrathecally administered phenoxybenzamine (1 and 5 μg per rat) inhibited the increase of the response latency induced by MA (50 ng per rat) injected into the NRPG but to a lesser extent than the β‐adrenoceptor antagonists. 5 It is concluded that the NRGC, the NRPG, the PAG and the lumbar enlargement are involved in the sites of the antinociceptive action of MA and that the antinociceptive effect of MA administered into NRPG is elicited by activation of the inhibitory noradrenergic neurones from the NRPG in particularly via β‐receptor‐mediated effects of noradrenaline.