Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
2000-02-01 |
タイトル |
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タイトル |
Temperature-dependent tonic contraction of smooth muscle in Antarctic fishes Notothenia neglecta and Chaenocephalus aceratus - Role of calcium ions and responses to acetylcholine |
言語 |
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言語 |
eng |
キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Antarctic fish |
キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
intestinal smooth muscle |
キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
cryobiology |
キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Notothenia neglecta |
キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Chaenocephalus aceratus |
資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
departmental bulletin paper |
ID登録 |
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ID登録 |
10.15094/00006148 |
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ID登録タイプ |
JaLC |
ページ属性 |
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内容記述タイプ |
Other |
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内容記述 |
P(論文) |
著者名(英) |
Bastos-Ramos, Wilma Pereira
Hoshino, Katsumasa
Bacila, Metry
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著者所属(英) |
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en |
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Departamento de Ciencias Basicas, Faculdade de Odontologia, Universidade Estadual Paulista (UNESP) |
著者所属(英) |
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en |
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Departamento de Ciencias Biologicas, Faculdade de Ciencias, (UNESP) |
著者所属(英) |
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en |
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Departamento de Bioquimica, Centro de Ciencias Biologicas e da Saude, Pontificia Universidade Catolica do Parana |
抄録(英) |
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内容記述タイプ |
Other |
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内容記述 |
The isolated intestinal smooth muscle of Antarctic fishes Notothenia neglecta and the icefish Chaenocephalus aceratus displayed a sustained tonic contraction depending upon the temperature of the nutritive bath. The contraction was maximal at 2℃, relaxing proportionally with rise of the temperature, from 2℃ to 18℃. The contractile responses to acetylcholine gradually increased in proportion to the rise of temperature. By chelating calcium ions, EDTA caused a reversible relaxation of the contracted muscle at 2.0℃. This effect was eliminated by washing out the drug from the muscle nutritive bath. Similar results were found with the administration of verapamil, a calcium channel blocker. However, after this drug, tonic contraction was not restored by washout. Such contraction was partially inhibited by the muscarinic blocking drug atropine. Results show that the tonic contraction is an active response, dependent on the entry of calcium into the cell and mediated by cholinergic receptors. The temperature-related tonic contraction is not a general event in poikilotherm animals, since it did not occur in the Bufo marinus intestinal smooth muscle, in similar experiments carried out as a control, in a tropical environment. The responsiveness of the smooth muscle to acetylcholine appeared to increase with temperature, suggesting lack of adaptation of the organ to low Antarctic temperature. |
雑誌書誌ID |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA11327019 |
書誌情報 |
Polar bioscience
巻 13,
p. 74-86,
発行日 2000-02
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出版者 |
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出版者 |
National Institute of Polar Research |