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Content archived on 2022-12-23

Evolutionary analysis of neuronal signal systems in the phylum Platyhelminthes

Objective



Chemical signals in the nervous system of flatworms are studied. Some classical neuronal signal systems have been discovered in simple organisms. Next to nothing is known about their appearence in evolution, functional role, its change in phylogeny and their relationship. The phylum Platyhelminthes is advantageous for this problem because these worms occupy a key position in evolution. They are the first animals with a central nervous system and with bilateral symmetry. They are well adapted to different environmental conditions, are free-living and parasitic, can reproduce sexually and asexually. The objectives of the project are: Identification of neuronal signal substances such as serotonin, neuropeptide F and free radical nitric oxide in flatworms of wide taxonomy range having different phylogenetical positions and from different ecological conditions. Isolation and sequencing of neuropeptides from different species of flatworms. Localization of the neural signal substances in different regions of the nervous system during different stages of the life cycle and regeneration. Investigation of the functional role of neuronal signal substances in development, reproduction and behaviour. Studies of the significance of neuronal signal substances in adaptation of flatworms to the environment. Elucidation of phylogenetic aspects of neuronal signal substances. The problem of neuronal chemical signals is in this project for the first time approached from many different angels and simultaneous with different methods by the 3 groups in Russia and 2 in INTAS countries. The experimental approaches are: immunocytochemistry on light and electron microscopy, confocal scanning laser microscopy, histochemistry, spectrofluorimetry, radiometry, sequencing of amino acides, microsurgery, morphometry, study of behaviour. The results of the project will give possibility to elucidate the morphofunctional mechanisms of development of flatworms from phylogenetical and ontogenetical positions. The results will play a role when solving fundamental problems of evolution of the nervous system, especially of the neuronal signal systems. In addition the results will help to use a new strategy in the control of parasites worldwide by methods which attack only the parasites and not their hosts.

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Coordinator

Abo Akademi University
EU contribution
No data
Address
Artillerigatan 6
20521 Turku/Abo
Finland

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Total cost

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Participants (4)

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