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Serotonin-immunoreactive neural system and contractile system in the hydroid Cladonema (Cnidaria, Hydrozoa)

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Invertebrate Neuroscience

Abstract

Serotonin is a widespread neurotransmitter which is present in almost all animal phyla including lower metazoans such as Cnidaria. Serotonin detected in the polyps of several cnidarian species participates in the functioning of a neural system. It was suggested that serotonin coordinates polyp behavior. For example, serotonin may be involved in muscle contraction and/or cnidocyte discharge. However, the role of serotonin in cnidarians is not revealed completely yet. The aim of this study was to investigate the neural system of Cladonema radiatum polyps. We detected the net of serotonin-positive processes within the whole hydranth body using anti-serotonin antibodies. The hypostome and tentacles had denser neural net in comparison with the gastric region. Electron microscopy revealed muscle processes throughout the hydranth body. Neural processes with specific vesicles and neurotubules in their cytoplasm were also shown at an ultrastructural level. This work demonstrates the structure of serotonin-positive neural system and smooth muscle layer in C. radiatum hydranths.

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Acknowledgments

We are grateful to the staff of the Laboratory of Electron Microscopy (Faculty of Biology, Moscow State University), Prof. N. Dulin (Chicago University) and Optical Research Group (Institute of Developmental Biology RAS, Moscow) for technical assistance.

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  1. Biological Faculty, Lomonosov Moscow State University, Leninskie Gory 1/12, Moscow, Russia

    T. D. Mayorova & I. A. Kosevich

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  1. T. D. Mayorova
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  2. I. A. Kosevich
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Correspondence to T. D. Mayorova.

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Mayorova, T.D., Kosevich, I.A. Serotonin-immunoreactive neural system and contractile system in the hydroid Cladonema (Cnidaria, Hydrozoa). Invert Neurosci 13, 99–106 (2013). https://doi.org/10.1007/s10158-013-0152-2

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  • DOI: https://doi.org/10.1007/s10158-013-0152-2

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