Sources of Activator Calcium Ions in the Contraction of Smooth Muscles in Aplysia kurodai(Physiology)
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概要
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The physiological and pharmacological properties of contraction and the ultrastructure of buccal mass retractor muscle (I4) and gill-pinnule closure muscle (GPCM) in Aplysia kurodai were studied to learn more about the sources of activator Ca^<2+> in molluscan smooth muscle. Acetylcholine (Ach) and high K^+-induced contractions were reduced by lowering the external Ca^<2+> concentration, and eliminated by the removal of extracellular Ca^<2+>. Nifedipine appreciably reduced Ach- and high K^+-induced contractions, while amiloride decreased only Ach-induced contractions and had no significant effect on high K^+-induced contractions. When nifedipine and amiloride were applied together, either type of contraction was still appreciable. Serotonin (5-HT) could potentiate subsequent Ach- and high K^+-induced contractions in I4; potentiated tension was significantly reduced by nifedipine and amiloride, whereas 5-HT inhibited Achand high K^+-induced contractions in GPCM. The potentiating effects of 5-HT may be mediated by the activation of the Ca^<2+>-channel to increase the influx from extracellular Ca^<2+>. Caffeine caused contractions in Ca^<2+>-free solution in both muscles. Electron microscopy revealed sarcolemmal vesicles underneath the plasma membrane in both muscle fibers. Electron microscopical cytochemistry demonstrated that pyroantimonate precipitates were localized in the sarcolemmal vesicles and in the inner surface of plasma membranes in the resting fibers. Present results indicate that the contractions of I4 and GPCM fibers are caused not only by Ca^<2+>-influx but also by Ca^<2+> release from the intracellular storage sites, such as the sarcolemmal vesicles and the inner surface of plasma membranes.
- 社団法人日本動物学会の論文
- 2005-08-25
著者
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Ishii Y
Department Of Biology Faculty Of Science Kobe University
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Ishii Yoshiki
Department Of Pulmonary Medicine Jichi Medical School
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Tsuchiya Teizo
Teikyo Heisei Univ. Tokyo Jpn
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Tsuchiya Teizo
Department Of Biology Faculty Of Science Kobe University
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Suzaki Toshinobu
Department of Biology, Graduate School of Science, Kobe University
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Ishii Yoshiki
Department Of Biology Faculty Of Science Kobe University
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LIU Han
Department of Pharmaceutical Analysis, China Pharmaceutical University
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Liu Han
Department Of Biology Faculty Of Science Kobe University
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WATARI Takashi
Department of Biology, Faculty of Science, Kobe University
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HUANG Zhenli
Department of Biology, Faculty of Science, Kobe University
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Miyake Shin-ichi
Department of Biology, Faculty of Science, Kobe University
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Huang Zhenli
Department Of Biology Faculty Of Science Kobe University
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Watari Takashi
Department Of Biology Faculty Of Science Kobe University
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Suzaki Toshinobu
Department Of Biology Faculty Of Science Kobe University
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Miyake Shin-ichi
Department Of Biology Faculty Of Science Kobe University
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