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Effect of Enalaprilat, an Angiotensin Converting Enzyme Inhibitor, on the Membrane Potential of Cultured Neuroblastoma-glioma Hybrid Toshiki Yamasaki 1 , Masako Kawahara 1 , Yasuhiko Akiyama 1 , Kouzo Moritake 1 , Kouichi Enomoto 2 , Takashi Maeno 2 1Department of Neurosurgery, Shimane Medical University 2second department of Physiology, Shimane Medical University Keyword: neuron , membrane potential , current impulse , angiotensin converting enzyme inhibitor , enalaprilat pp.1039-1044
Published Date 1993/11/1
DOI https://doi.org/10.11477/mf.1406900557

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  • Abstract
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The effect of enalaprilat on the membrane poten-tial of cultured neuroblastoma-glioma hybrid NG108-15 cells was investigated using the currentclamp method. The NG108-15 cell line characteristi-cally differentiates into neurons after addition of 1 mM dibutyril cAMP to the culture medium. First it was found that enalaprilat inhibits both sodium and calcium currents in the cell membrane of differentiated NG108-15 cells. At concentrations between 10 and 100μM, this inhibitory effect was reversible and transient, and occurred in a dose-dependent manner. Prolonged washing with normal saline (>20 min) was needed to completely reverse the inhibitory effect of enalaprilat. The higher the concentration of enalaprilat, the greater its suppres-sant action on the membrane potential, and at high concentrations (100μM), enalaprilat caused the peak membrane potential to disappear. When cells were incubated with enalaprilat, 100μM, for longer periods, however, this inhibitory effect appeared to become irreversible. These findings suggest that enalaprilat has an inhibitory effect on the electro-physiological activity of neurons especially on membrane calcium currents.


Copyright © 1993, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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