Activation of Xenopus Eggs by Cynops Sperm Extract is Dependent upon Both Extra-and Intra-Cellular Ca Activities

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概要

• 論文の詳細を見る

• When unfertilized Xenopus eggs were treated by Cynops sperm extract in 10% Steinberg's solution (SB), egg's membranes hyperpolarized to about −37 mV and then depolarized to elicit a positive-going potential amounting to about +34 mV. The eggs underwent cortical contraction and resumption of meiosis. Activation of eggs in various external solutions indicates that the hyperpolarization is due mainly to opening of Na channels, but the positive-going potential is due to Cl channels on the egg's plasma membranes. Since the activation was inhibited by CdCl_[2], CoCl_[2], or NiCl_[2] as well as by amiloride, Ca influx through Ca channels is necessary for the activation by the sperm extract. A propagative intracellular Ca release was induced not only by Cynops sperm, but also by their sperm extract. Injection of BAPTA or heparin into the eggs completely inhibited activation, indicating that egg activation requires an intracellular Ca release dependent upon receptors for inositol 1,4,5-trisphosphate.

• 社団法人日本動物学会の論文
• 1995-10-15

著者

• Miki Akiko

  Department Of Biological Science Faculty Of Science Yamaguchi University

• IWAO Yasuhiro

  Laboratory of Molecular Developmental Biology, Graduate School of Medicine, Yamaguchi University

• Kobayashi Michiko

  Department Of Biotechnology Graduate School Of Engineering Osaka University

• Iwao Y

  Department Of Biological Science Faculty Of Science Yamaguchi University

• Iwao Yasuhiro

  Department Of Biological Science Faculty Of Science Yamaguchi University

• Iwao Yasuhiro

  Laboratory Of Molecular Developmental Biology Graduate School Of Medicine Yamaguchi University

• YOSHIMOTO YASUAKI

  Biological Laboratory, Kansai Medical University

• Kubota Y.

  Department of Zoology, Faculty of Science, Kyoto University

• Yoshimoto Yasuaki

  Biological Laboratory Kansai Medical University

• Kubota Y.

  Department Of Zoology Faculty Of Science Kyoto University

• Kubota Hiroshi

  Department Of Appl Ed Physics Sccond Faculty Of Engineering Tokyo Univ.

• Kobayashi Michiko

  Department Of Biological Science Faculty Of Science Yamaguchi University

• Kubota Y.

  Department Of Oral And Maxillofacial Surgery Graduate School Of Dental Science Kyushu University

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