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ID 56027
Sort Key
7
Title Alternative
Cytoskeletal elements in an acoelomorph worm, Praesagittifera naikaiensis
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Author
Ikeda, Risa Graduate School of Education, Okayama University
Fujiwara, Chiho Graduate School of Education, Okayama University
Hamada, Mayuko Ushimado Marine Institute, Faculty of Science, Okayama University
Sakamoto, Tatsuya Ushimado Marine Institute, Faculty of Science, Okayama University ORCID Kakenhi publons
Saito, Noboru Graduate School of Environmental and Life Science, Okayama University
Ando, Motonori Graduate School of Education, Okayama University
Abstract
Acoel flatworms can move in a variety of ways such as muscular and ciliary movements via cytoskeletal elements and their neural regulations. However, those locomotive mechanisms have not yet been fully elucidated. In this study, we examined the distribution of cytoskeletal elements including filamentous actin (F-actin) and tubulin, and the neuroanatomical organization in an acoelomorph worm, Praesagittifera naikaiensis (P. naikaiensis). Video microscopy revealed the elongation/contraction and the bending/rotation processes, and the ciliary gliding movement of P. naikaiensis. Histochemical and morphological analysis demonstrated that F-actin networks of inner longitudinal and outer circular muscle fibers were positioned along the entire surface of the body, and that the average distance between the circular muscle fibers in the contracted organism was decreased in the anterior region compared with that in the elongated organism. Electron microscopy showed dense bodies on the muscle cells of P. naikaiensis, which indicates that those muscle cells have the appearance of vertebrate smooth muscle cells. Immunohistochemical analysis revealed that -tubulin-positive signals on the ciliary microtubules had close contact with the F-actin network, and that neurite bundles labelled with anti dSap47 antibody as a neuronal marker run along the anterior-posterior body axis. These results indicate that the well-organized cytoskeletal elements and their neural control systems are preserved in P. naikaiensis, and that their mechanisms involved in those regulation systems are similar to those vertebrate systems. Further studies are needed to clarify the physiological mechanisms underlying the muscular and ciliary movements in P. naikaiensis.
Note
寄稿(Contribution)
Publication Title
Proceedings of Okayama Association for Laboratory Animal Science
Published Date
2018-04
Volume
volume34
Publisher
岡山実験動物研究会
Publisher Alternative
Okayama Association for Laboratory Animal Science
Start Page
21
End Page
27
Content Type
Journal Article
OAI-PMH Set
岡山大学
language
日本語
File Version
publisher
NAID
Eprints Journal Name
poalas