Different Effects of N-Ethylmaleimide on the Tension Components of Bullfrog Atrium
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- タイトル別名
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- Different Effects of N Ethylmaleimide o
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The effects of N-ethylmaleimide (NEM) on the tension components of bullfrog atrium were studied under voltage clamp conditions using the double sucrose gap technique. NEM at a dilution of 10-3 M inhibited the ICa-independent tonic tension elicited by large and long depolarizing pulses (140 mV, 2 sec) time-dependently, whereas the drug produced an initial transient increase and a later decrease of the ICa-dependent phasic tension elicited by small and short depolarizing pulses (60 mV, 100 msec). The effect of NEM was facilitated when the atrial muscles were exposed to a solution having either a reduced Na or an increased Ca concentration. In the presence of Mn ions, 10-3 M NEM did not evidently inhibit tonic tension, and it led to a slight transient increase in phasic tension. NEM at 10-3 M, which is known to inhibit sarcolemmal Na, K-ATPase, enhanced both the phasic tension and the tonic tension in the presence of ouabain and when perfused with K-free solution. Even under these conditions 10-3 M NEM caused an initial transient decrease of ICa-independent tonic tension. This suggests that NEM has a different action on the atrial muscle from those of cardiac glycosides such as ouabain.
収録刊行物
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- The Japanese Journal of Physiology
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The Japanese Journal of Physiology 28 (6), 771-782, 1978
一般社団法人 日本生理学会
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詳細情報 詳細情報について
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- CRID
- 1390282680018713088
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- NII論文ID
- 130003476695
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- NII書誌ID
- AA00691224
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- COI
- 1:CAS:528:DyaE1MXhs1alsbc%3D
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- ISSN
- 18811396
- 0021521X
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- NDL書誌ID
- 2072591
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- PubMed
- 221708
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- PubMed
- CiNii Articles
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- 使用不可