Oscillations of Membrane Potential and Membrane Resistance during the Cell Cycle in the Newt Egg Macromeres : Physiology

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概要

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• The electrical characteristics of macromeres in newt eggs at the morula stage were examined electrically during the cell cycle, and the negative membrane potential (Em) and membrane resistance (Rm) were found to oscillate. For designation of the cell stage in the cell cycle, the time between cleavage-furrow formations was divided into 100 stages. The cell stage at which furrow formation occurred was designated St.50. The increase in Rm began from St.0 and reached a peak value at St.30. On the other had, the membrane showed hyperpolarization from St.10 to St.40 and then showed depolarization. After furrow formation, Rm continued to decrease and reached a minimum value at St.60, after which the value increased and showed a small peak at St.80. The membrane continued to depolarize from St.40 and reached a plateau level at around St.60. To investigate the mechanism of these electrical changes, an Na^+-K^+ pump inhibitor and high-Ca^<2+> solution were perfused to the macromeres. Despite the inhibition of the Na^+-K^+ pump, the membrane was hyperpolarized during the furrow formation. Accordingly it appears that the Na^+-K^+ pump does not participate in the hyperpolarization of the membrane upon the furrow formation in macromeres. In high Ca^<2+>-application, the times of minimum Rm and the hyperpolarization of the membrane during the cell cycle did not always coincide with the time of furrow formation. Consequently it appears that these electrical and morphological changes are controlled by two mechanisms which are independent of each other and linked to the normal cell cycle.

• 社団法人日本動物学会の論文
• 1989-08-15

著者

• SATO Eiji

  Department of Neurosurgery, University of Yamanashi, Faculty of Medicine

• Sato Eiji

  Department Of Biochemistry Osaka City University Graduate School Of Medicine

• TAGAWA SHIN-ICHI

  Department of Biology, Faculty of Science, Kumamoto University

• Tagawa Shin-ichi

  Department Of Biology Faculty Of Science Kumamoto University

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