DIVALENT CATION TRANSPORT IN KIDNEY SLICES II. MAGNESIUM TRANSPORT IN KIDNEY CORTEX SLICES AND EFFECTS OF DIURETICS
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概要
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We examined the properties of Mg<SUP>2+</SUP> transport in rat kidney cortex slices and the effects of diuretics were also studied. Incubation with 1 mM 2, 4-dinitrophenol, or under anaerobic conditions, sharply inhibited Mg<SUP>2+</SUP> influx, while markedly stimulating Mg<SUP>2+</SUP> efflux. Under conditions of hypothermia, partial inhibition of Mg<SUP>2+</SUP> influx and significant enhancement of Mg<SUP>2+</SUP> efflux were observed. Mg<SUP>2+</SUP> influx was not affected by ouabain, by altering CaCl<SUB>2</SUB> concentration in the medium, or by a change of Ca<SUP>2+</SUP> content in the slices. Incubation with 1 mM ethacrynic acid or mersalyl depressed Mg<SUP>2+</SUP> influx and stimulated Mg<SUP>2+</SUP> efflux, p-chloromercuribenzoic acid (5×10<SUP>-4</SUP> M) had a similar effect and furosemide had no effect on Mg<SUP>2+</SUP> transport. These results suggest that Mg<SUP>2+</SUP> influx is mediated by an energy-dependent process which is dissociated from ouabain-sensitive Na<SUP>+</SUP> transport and Ca<SUP>2+</SUP> flux. Sulfhydryl groups may be involved in the process of Mg<SUP>2+</SUP> influx.
- 社団法人 日本薬理学会の論文
著者
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GEMBA MUNEKAZU
Department of Pharmacology, Osaka College of Pharmacy
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MATSUSHIMA Yohkazu
Department of Cardiovascular Dynamics, Research Institute, National Cardiovascular Center
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Matsushima Yohkazu
Department Of Cardiovascular Dynamics Research Institute National Cardiovascular Center
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Gemba Munekazu
Department Of Pharmacology Osaka College Of Pharmacy
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