Abstract
Ctenophores are transparent marine organisms that swim by means of beating cilia; they are the simplest animals with individual muscle fibres. Predatory species, such as Beroe ovata, have particularly well-developed muscles and are capable of an elaborate feeding response1. When Beroe contacts its prey, the mouth opens, the body shortens, the pharynx expands, the prey is engulfed and the lips then close tightly. How this sequence, which lasts 1 s, is accomplished is unclear. The muscles concerned are structurally uniform2,3 and are innervated at each end by a neuronal nerve net4 with no centre for coordination. Isolated muscle cells studied under voltage-clamp provide a solution to this puzzle. We find that different groups of muscle cells have different time-dependent membrane currents. Because muscle contraction depends upon calcium entry during each action potential, these different currents produce different patterns of contraction. We conclude that in a simple animal such as a ctenophore, a sophisticated set of mem-brane conductances can compensate for the absence of an elaborate system of effectors.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Tamm, S. L. in Eiectrical conduction and behaviour in ‘simple’ invertebrates (ed. Shelton, G. A. B.) 266–358 (Clarendon, Oxford, 1982).
Hemandez-Nicaise, M.-L., Mackie, G. O. & Meech, R. W. J. gen. Physiol. 75, 79–105 (1980).
Hemandez-Nicaise, M.-L. & Amsellem, J. J. Ultrastruct. Res. 72, 151–168 (1980).
Hemandez-Nicaise, M.-L. J. Neurocytol. 2, 249–263 (1973).
Hernandez-Nicaise, M.-L., Bilbaut, A., Malaval, L. & Nicaise, G. Proc. natn. Acad. Sci. U.S.A. 79, 1884–1888 (1982).
Meves, H. & Pichon, Y. J. Physiol., Lond. 268, 511–532 (1977).
Hagiwara, S. & Byerly, L. A. Rev. Neurosci. 4, 69–125 (1981).
Walsh, J. V. & Singer, J. J. Pflug. Arch. 390, 207–210 (1981).
Meech, R. W. & Standen, N. B. J. Physiol., Lond. 249, 211–239 (1975).
Hagiwara, S., Kusano, K. & Saito, N. J. Physiol., Lond. 155, 470–489 (1961).
Solc, C. K., Zagotta, W. N. & Aldrich, R. W. Science 236, 1094–1098 (1987).
Kostyuk, P. G., Velelovsky, N. S., Fedulova, S. A. & Tsyndrenko, A. Y. Neuroscience 6, 2439–2444 (1981).
Cooper, E. & Shrier, A. J. Physiol., Lond. 369, 199–208 (1985).
Benham, C. D., Bolton, T. B., Lang, R. J. & Takewaki, T. J. Physiol., Lond. 371, 45–67 (1986).
Mackie, G. O. & Meech, R. W. Nature 313, 791–793 (1985).
Hodgkin, A. L. & Nakajima, S. J. Physiol., Lond. 221, 105–120 (1972).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Bilbaut, A., Nicaise, ML., Leech, C. et al. Membrane currents that govern smooth muscle contraction in a ctenophore. Nature 331, 533–535 (1988). https://doi.org/10.1038/331533a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/331533a0
This article is cited by
-
Independent specialisation of myosin II paralogues in muscle vs. non-muscle functions during early animal evolution: a ctenophore perspective
BMC Evolutionary Biology (2012)
-
Feeding behavior of the ctenophore Thalassocalyce inconstans: revision of anatomy of the order Thalassocalycida
Marine Biology (2009)
-
Cytochemical localization of Ca2+-ATPases and demonstration of ATP-dependent calcium sequestration in giant smooth muscle fibres of Beroe
Journal of Muscle Research and Cell Motility (1996)
-
Two distinct distribution patterns of sarcoplasmic reticulum in two functionally different giant smooth muscle cells of Beroe ovata
Cell & Tissue Research (1995)
-
Actin pegs and ultrastructure of presumed sensory receptors of Bero� (Ctenophora)
Cell and Tissue Research (1991)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.