Abstract
Proper regulation of physiological activities is crucial for homeostasis in animals. Autonomic regulation of these activities is most developed in mammals, in which a part of peripheral nervous system, termed the autonomic nervous system plays the dominant role. Circulatory activity and digestive activity in vertebrates change in opposite phases to each other. The stage where circulatory activity is high and digestive activity is low is termed the “fight or flight stage” while the stage where circulatory activity is low and digestive activity is high is termed the “rest and digest stage”. It has been thought that the autonomic nervous system originated in early vertebrate phyla and developed to its greatest extent in mammals. In this study, we compared the pattern of change of circulatory and digestive activities in several invertebrates and found that the two stages seen in mammals are also present in a wide variety of animals, including evolutionarily early-diverging invertebrate taxa. From this and other arguments we propose a novel possibility that the basic properties of the autonomic nervous system were established very early in metazoan evolution.
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Notes
Various types of feeding habit are employed in Mollusks including herbivores (Aplysia), carnivores (Octopus) and scavengers (Babylonia). One thing common to all types is that they use radula for feeding.
In hydra, it is possible to construct animals that have no neurons by treating animals with drugs, e.g. hydroxyurea (HU). HU blocks the transition of cells from G1 to S phase. Virtually, however, a large fraction of cells in S phase are also severely damaged and preferentially eliminated. Since multipotent stem cells in hydra have shorter cell cycle time than epithelial cells, the stem cells that spend larger fraction of time in S phase are more easily damaged and eliminated than epithelial cell lineage. The polyps thus constructed have no neurons leaving secretory gland cells other than epithelial cells. By feeding them by transferring Artemia into the digestive tract by hand, it is possible for the nerve free hydra to survive and moreover even to proliferate by asexual budding.
The myenteric plexus in mammals is made up of multiple ganglia and bundles of neural fibers that connect the ganglia. In contrast, the diffuse nerve net in hydra is made up of single neural cell bodies and single neural fibers that connect the cell bodies. Therefore, the two systems have netlike structure. In the nerve net of hydra, two neuropeptides GLWamide and Hym-355 (FPQSFLPRGamide) are found in the neurons whereas cholinergic neurons and serotonergic neurons are not. Since those two neuropeptides had no effect on digestive movements (T. Fujisawa, personal communication), the hormonal factor that activates digestive movements remains to be discovered.
The measurement was carried out using a wild type strain of Hydra magnipapillata (strain 105) cultured under standard mass culture conditions (Sugiyama and Fujisawa 1977). They were fed three times a week and for each feeding animals were transferred to fresh culture medium 3–5 h after the feeding. An animal that had been starved for 24 h was placed in culture solution in a plastic dish of 50 mm in diameter. Behavior of the animal before and after feeding was recorded with a CCD camera on a dissecting microscope connected to a VCR.
Abbreviations
- ANS:
-
Autonomic nervous system
- SNS:
-
Sympathetic nervous system
- PSNS:
-
Parasympathetic nervous system
- CNS:
-
Central nervous system
- ENS:
-
Enteric nervous system
- NE:
-
Norepinephrine
- ACh:
-
Acetylcholine
- 5-HT:
-
5-Hydroxytryptamine
- GABA:
-
4-Aminobutanoic acid
- HU:
-
Hydroxyurea
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Acknowledgments
The authors wish to thank Dr. H. Morishita at Hiroshima University for numerous advices and fruitful discussions about mollusks. They also wish to thank Dr. W.M. Kier at University of North Carolina and Dr. H.J. Chiel at Case Western Reserve University for providing reprints, information and encouragement. We would also like to thank Prof. R. Steele at University of California at Irvine for improving English. This research was supported by a grant from Japanese Ministry of Education to H.S (No. 60170191).
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Shimizu, H., Okabe, M. Evolutionary origin of autonomic regulation of physiological activities in vertebrate phyla. J Comp Physiol A 193, 1013–1019 (2007). https://doi.org/10.1007/s00359-007-0256-4
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DOI: https://doi.org/10.1007/s00359-007-0256-4