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Thimerosal reveals calcium-induced calcium release in unfertilised sea urchin eggs

Published online by Cambridge University Press:  26 September 2008

Alex McDougall
Affiliation:
Department of Physiology, University College, London, London, UK
Isabelle Gillot
Affiliation:
Department of Physiology, University College, London, London, UK
Michael Whitaker*
Affiliation:
Department of Physiology, University College, London, London, UK
*
Michael Whitaker, Department of Physiology, University College London, Gower Street, London WC1E 6BT, UK. Telephone: +44 71 388 9304. Fax: +44 71 388 3892.

Summary

The fertilisation calcium wave in sea urchin eggs triggers the onset of development. The wave is an explosive increase in intracellular free calcium concentration that begins at the point of sperm entry and crosses the egg in about 20 s. Thimerosal is a sulphydryl reagent that sensitises calcium release from intracellular stores in a variety of cell types. Treatment of unfertilised eggs with thimerosal causes a slow increase that results eventually in a large, spontaneous calcium transient and egg activation. At shorter times after thimerosal treatment, egg activation and the calcium transient can be triggered by calcium influx through voltage-gated calcium channels, a form of calcium-induced/calcium release (CICR). Thimerosal treatment also reduces the latency of the fertilisation calcium response and increases the velocity of the fertilisation wave. These results indicate that thimerosal can unmask CICR in sea urchin eggs and suggest that the ryanodine receptor channel based CICR may contribute to explosive calcium release during the fertilisation wave.

Type
Article
Copyright
Copyright © Cambridge University Press 1993

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