2012 Fiscal Year Final Research Report
The possibleprincipal function of neurohypophysial hormones
| Project/Area Number |
22570065
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Morphology/Structure
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| Research Institution | Okayama University |
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Principal Investigator |
SAKAMOTO Tatsuya 岡山大学, 大学院・自然科学研究科, 教授 (10294480)
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| Co-Investigator(Kenkyū-buntansha) |
OGOSHI Maho 岡山大学, 自然科学研究科, 助教 (00527997)
SAKAMOTO Hirotaka 岡山大学, 自然科学研究科, 准教授 (20363971)
TAKAHASHI Hideya 岡山大学, 理学部, 助教 (50627635)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 比較内分泌 |
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| Research Abstract |
Acclimation from marine to dilute environments constitutes among the most dramatic evolutionary transitions in the history of life. Such adaptations have evolved in multiple lineages, but studies of the mechanisms are limited to those using evolutionarily advanced Deuterostome (chordates) and Ecdysozoa (crustaceans). Here we examined the body-fluid homeostasis in the advanced Lophotrochozoa/mollusc, the other unexplored taxa, and its possible regulations byvasopressin/oxytocin superfamily peptides known to be implicated in fluid homeostasis in Chordata and Arthropoda. The hemolymph osmotic and ionic status in the euryhaline cephalopod (Octopus ocellatus) following transfer from normal seawater (30 ppt) to low (20 ppt) salinity indicate the hyperosmo- and hyperiono-regulatory abilities for more than 1 week, as in crustaceans and teleost fish. While ventilation frequency decreased by 1 day, Na+/K+-ATPase activity, which has been implicated in ion transport generally, was induced in two of the eight posterior gills after 1 week. Furthermore, the octopuses were intravenously injected with 1 or 100 ng/g octopressin or cephalotocin, cephalopod vasopressin/oxytocin orthologs. After 1 day, octopressin, not cephalotocin, decreased the hemolymph osmolality and Ca concentrations as well as urinary Na concentrations. These data provide evidence for convergent evolution in the hyper-ionoregulatory mechanisms and the coordination by conserved molecules.
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Research Products
(20 results)
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[Journal Article] Static and dynamic hypergravity responses of osteoblasts and osteoclasts in medaka scales2013
Author(s)
S. Yano, K. Kitamura, Y. Satoh, M. Nakano, A. Hattori, T. Sekiguchi, M. Ikegame, H. Nakashima, K. Omori, K. Hayakawa, A. Chiba, Y. Sasayama, S. Ejiri, Y. Mikuni-Takagaki, H. Mishima, H. Funahashi, T. Sakamoto, N. Suzuki
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Journal Title
Zool Sci
Volume: 30
Pages: 217-223
Peer Reviewed
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[Journal Article] Cloning of two members of the calcitonin-family receptors from stingray, Dasyatis akajei: Possible physiological roles of the calcitonin family in osmoregulation2012
Author(s)
N. Suzuki, T. Sekiguchi, H. Satake, K. Kato, Y. Nishiyama, H. Takahashi, J.A. Danks, T.J. Martin, A. Hattori, M. Nakano, M. Kakikawa, S. Yamada, M. Ogoshi, S. Hyodo, Y. Yamaguchi, V.S. Chowdhury, K. Hayakawa, H. Funahashi, T. Sakamoto, Y. Sasayama
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Journal Title
Gene
Volume: 499
Pages: 326-331
Peer Reviewed
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[Journal Article] Prostaglandin e(2) increases both osteoblastic and osteoclastic activity in the scales and participates in calcium metabolism in goldfish2012
Author(s)
K. Omori, S. Wada, Y. Maruyama, A. Hattori, K. Kitamura, Y. Sato, M. Nara, H. Funahashi, K. Yachiguchi, K. Hayakawa, M. Endo, R. Kusakari, S. Yano, A.K. Srivastav, T. Kusui, S. Ejiri, W. Chen, Y. Tabuchi, Y. Furusawa, T. Kondo, Y. Sasayama, T. Nishiuchi, M. Nakano, T. Sakamoto, N. Suzuki
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Journal Title
Zool Sci
Volume: 29
Pages: 499-504
DOI
Peer Reviewed
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[Journal Article] Detection and activity of iodine-131 in brown algae collected in the Japanese coastal areas2010
Author(s)
T. Morita, K. Niwa, K. Fujimoto, H. Kasai, H. Yamada, K. Nishiutch, T. Sakamoto, W. Godo, S. Taino, Y. Hayashi, K. Takeno, T. Nishigaki, K. Fujiwara, H. Aratake, S. Kamonoshita, H. Hashimoto, T. Kobayashi, S. Otosaka, T. Imanaka
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Journal Title
Sci Total Environ
Volume: 408
Pages: 3443-3447
Peer Reviewed
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