A NEW METHOD FOR THE BIOLOGICAL ASSAY OF CARDIOTONIC STEROIDS BASED ON THE POTENTIATION OF POTASSIUM-CONTRACTURE OF THE FROG VENTRICULAR MUSCLE
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概要
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So far there seems to have been no practical method for the assay of cardiotonic steroids which measures their positive inotropic activity per se directly on the cardiac muscle preparation. A series of studies on the structure-activity relationship of cardenolides conducted in this laboratory have brought about much newer knowledge on this problem, including dispensability of 3β-hydroxy group or 14β-hydroxy group for cardiotonic action and inactiveness of 15α-hydroxydigitoxigenin (1-4). In the course of the study, it was felt necessary to describe the potencies of important compounds in terms of numerical values. This led us to develop a new assay method which is based on the potentiation of K-contracture of frog ventricular muscle by these compounds, and it has been applied successfully at least to the aglycones. The present paper will report on the new method and the results of the assay of seven aglycones. In addition, the relative potencies of the compounds were compared with those obtained by another method with Straubs isolated frog heart preparation.
- 社団法人 日本薬理学会の論文
著者
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SHIGEI Tatsuro
Department of Pharmacology, Nagoya University School of Medicine
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SAKUMA Akira
Department of Clinical Pharmacology, Medical Research Institute, Tokyo Medical and Dental University
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TAKEDA Keisuke
Medical Research Laboratory, Central Institute for Experimental Animals
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SAKUMA Akira
Department of Pharmacology, Institute for Cardiovascular Diseases, Tokyo Medical and Dental University
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Shigei Tatsuro
Department of Cell Pharmacology, Nagoya University Graduate School of Medicine
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SHIGEI Tatsuro
Department of Pharmacology, Nagoya University, School of Medicine
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