Abstract
Inoptopic effect of yttrium acetate (Y3+) on myocardium of the marsh frog Rana ridibunda and its effect on ion transport across the inner mitochondrial membrane (IMM) of rat heart was studied. Y3+ was found to decrease the rate of heart contractions and to stimulate ion transport in the rat heart mitochondria in media with 10 mM glutamate and 2 mM malate. Presence of Y3+ induced inhibition of energy-dependent Ca2+ transport into mitochondria, which was expressed as a marked decrease of their swelling in the media containing 125 mM NH4NO3 and Ca2+ or 25 mM potassium acetate, 100 mM sucrose and Ca2+. It is suggested that the Y3+-induced decrease in rat muscle contractions is determined not only by direct suppressing effect of Y3+ on potential-modulated Ca2+-channels of pacemaker and contractile cardiomyocytes (CM), but also by its indirect effect on Ca2+-carrier in IMM. The data confirming that Y3+ activates energy-dependent K+ transport catalyzed by mitochondrial uniporter and blocks Ca2+-channels in the mitochondrial membrane are important for more complete understanding of mechanisms of the Y3+ action on vertebrates and human CM.
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