Abstract:
:The ability of putative melatonin receptor antagonists to antagonise melatonin-induced aggregation of pigment granules in cultured neural crest Xenopus laevis melanophores was examined. Neither ML 23 (N-(2,4-dinitrophenyl)-5-methoxytryptamine) nor 6-methoxy-2-benzoxazolinone showed agonist or antagonist activity. N-Acetyltryptamine and N-butanoyltryptamine were partial agonists; both compounds aggregated pigment granules in some cells, but also reversed melatonin-induced pigment agreggation in a fraction of the cells tested. In contrast, 2-benzyl N-acetyltryptamine (luzindole) did not show agonist activity (upto 10 microM) but did reverse the aggregating action of melatonin at 1 and 10 microM. Pretreatment of melanophores with luzindole shifted the melatonin concentration-response curve to the right.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Sugden Ddoi
10.1016/0014-2999(92)90629-ikeywords:
subject
Has Abstractpub_date
1992-03-31 00:00:00pages
405-8issue
3eissn
0014-2999issn
1879-0712pii
0014-2999(92)90629-Ijournal_volume
213pub_type
杂志文章abstract::Local administration of amitriptyline into the rat hindpaw produces peripheral antinociception; this is reduced by adenosine receptor antagonists and appears to involve endogenous adenosine. The present study used peripheral microdialysis: (a) to determine whether amitriptyline could enhance extracellular tissue level...
journal_title:European journal of pharmacology
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journal_title:European journal of pharmacology
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journal_title:European journal of pharmacology
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