Effect of putative melatonin receptor antagonists on melatonin-induced pigment aggregation in isolated Xenopus laevis melanophores.

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 Pharmacol

authors

Sugden D

doi

10.1016/0014-2999(92)90629-i

keywords:

subject

Has Abstract

pub_date

1992-03-31 00:00:00

pages

405-8

issue

3

eissn

0014-2999

issn

1879-0712

pii

0014-2999(92)90629-I

journal_volume

213

pub_type

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