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Action of serotonin antagonists on cytoplasmic calcium levels in early embryos of sea urchin Lytechinus pictus

Lookup NU author(s): Emeritus Professor Michael Whitaker

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Abstract

Possible interaction of the serotonergic system with intracellular calcium mechanisms was investigated using techniques of ratio imaging measurement of intracellular Ca2+ and confocal microscopy in cleaving embryos of sea urchin Lytechinus pictus. Some serotonin antagonists specifically increase free intracellular Ca2+ and evoke transient regression of the first cleavage furrow, suggesting possible linkage of serotonergic and calcium mechanisms in the regulation of cellular events during cleavage divisions. These effects were more pronounced in the experiments with hydrophilic 5-HT-antagonists, quarternary ammonium salts that do not penetrate the cell membrane. Thus, it appears that 5-HT- receptors which mediate these effects are localised on the cell membrane, whereas previously studied receptors mediating the cytostatic action of lipophilic 5-HT-antagonists are localised intracellularly.

Publication metadata

Author(s): Shmukler YB, Buznikov GA, Whitaker MJ

Publication type: Article

Publication status: Published

Journal: International Journal of Developmental Biology

Year: 1999

Volume: 43

Issue: 2

Pages: 179-182

Print publication date: 01/03/1999

ISSN (print): 0214-6282

ISSN (electronic): 1696-3547

Publisher: Universidad del Pais Vasco * Servicio Editorial

URL: http://www.ijdb.ehu.es/web/paper.php?doi=10235395

PubMed id: 10235395

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