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Published 14 April 2003. doi:10.1083/jcb.200212053
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*CALCIUM COMPOUNDS
*CALCIUM, ELEMENTAL
*NICKEL, ELEMENTAL
*POTASSIUM
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© The Rockefeller University Press, 0021-9525/2003/4/89 $5.00
The Journal of Cell Biology, Volume 161, Number 1, 89-101

Article

Speract induces calcium oscillations in the sperm tail



Chris D. Wood, Alberto Darszon and Michael Whitaker

School of Cell and Molecular Biosciences, University of Newcastle upon Tyne, NE2 4HH, UK

Address correspondence to Michael Whitaker, School of Cell and Molecular Biosciences, Medical School, Framlington Place, University of Newcastle upon Tyne, NE2 4HH, UK. Tel.: 44-191-222-5264. Fax: 44-191-222-5164. E-mail: michael.whitaker{at}ncl.ac.uk

Sea urchin sperm motility is modulated by sperm-activating peptides. One such peptide, speract, induces changes in intracellular free calcium concentration ([Ca2+]i). High resolution imaging of single sperm reveals that speract-induced changes in [Ca2+]i have a complex spatiotemporal structure. [Ca2+]i increases arise in the tail as periodic oscillations; [Ca2+]i increases in the sperm head lag those in the tail and appear to result from the summation of the tail signal transduction events. The period depends on speract concentration. Infrequent spontaneous [Ca2+]i transients were also seen in the tail of unstimulated sperm, again with the head lagging the tail. Speract-induced fluctuations were sensitive to membrane potential and calcium channel blockers, and were potentiated by niflumic acid, an anion channel blocker. 3-isobutyl-1-methylxanthine, which potentiates the cGMP/cAMP-signaling pathways, abolished the [Ca2+]i fluctuations in the tail, leading to a very delayed and sustained [Ca2+]i increase in the head. These data point to a model in which a messenger generated periodically in the tail diffuses to the head. Sperm are highly polarized cells. Our results indicate that a clear understanding of the link between [Ca2+]i and sperm motility will only be gained by analysis of [Ca2+]i signals at the level of the single sperm.

Key Words: motility; fluorescence imaging; cyclic nucleotides; cell polarity; membrane potential

C.D. Wood and A. Darszon contributed equally to this paper.

A. Darszon is on sabbatical from the Institute of Biotechnology, Department of Genetics and Molecular Physiology, National Autonomous University of Mexico, Cuernavaca, Morelos 62210, Mexico.

* Abbreviations used in this paper: AR, acrosome reaction; [Ca2+]e, extracellular Ca2+; [Ca2+]i, intracellular free calcium concentration; Em, membrane potential; IBMX, 3-isobutyl-1-methylxanthine; [K+]e, external concentration of K+; VDCC, voltage-dependent cation channel.


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