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• W2040640069 abstract "The influence of vanadium in the nominally +5 (NH4VO3; referred to as V5+), +4 (C10H14O5V and VOSO4; V4+) and +3 oxidation states (VCl3; V3+) on cardiac force of contraction, adenylate cyclase and (Na+ + K+)-ATPase activity was investigated in order to determine which form of vanadium mediates the cardiac effects. V5+, V4+ and V3+ (300 microM each) increased the force of contraction of isolated electrically driven cat papillary muscles by about 100%. In the presence of the reducing agent ascorbic acid (5 mM) none of the three compounds led to any distinct increase in force of contraction. On the particulate adenylate cyclase preparation from feline right ventricles only V5+ stimulated the enzyme activity by about 100%, whereas V4+ and V3+ were ineffective. In the presence of 5 mM ascorbic acid all three compounds were ineffective. In contrast, in the presence of the oxidizing agent diamide (azodicarboxylic acid-bis-dimethylamide; 1 mM) all three compounds became stimulatory. On the isolated (Na+ + K+)-ATPase V5+ (500 microM) alone reduced the basal activity by about 95%. In the presence of ascorbic acid the inhibitory effect of V5+ was greatly diminished. Similar results were obtained with V4+, V3+ (100 microM) alone inhibited (Na+ + K+)-ATPase activity only by about 40%. In the presence of ascorbic acid V3+ was ineffective. From the results it is concluded that positive inotropism, stimulation of adenylate cyclase and inhibition of (Na+ + K+)-ATPase by vanadium compounds likewise result from an action of vanadium in the +5 oxidation state." @default.
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• W2040640069 date "1982-12-01" @default.
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• W2040640069 title "Effect of vanadium in the +5, +4 and +3 oxidation states on cardiac force of contraction, adenylate cyclase and (NA+ + K+)-ATPase activity" @default.
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• W2040640069 doi "https://doi.org/10.1016/0006-2952(82)90302-1" @default.
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