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Effect of oxidative processes in mitochondria on contractility of heart muscle of the frog Rana temporaria. Actions of Cd2+

  • Comparative and Ontogenic Physiology
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Abstract

The inotropic Cd2+ action on frog heart is studied with taking into account its toxic effects upon mitochondria. Cd2+ at concentrations of 1, 10, and 20 mM is established to decrease dose dependently (21.3, 50.3, and 72.0%, respectively) the muscle contraction amplitude; this is explained by its competitive action on the potential-controlled Na2+-channels of the L-type (Cav 1.2). In parallel experiments on isolated rat heart mitochondria (RHM) it was shown that Cd2+ at concentrations of 15 and 25 mM produces swelling of non-energized and energized mitochondria in isotonic (with KNO2 and NH2NO3) and hypoosmotic (with 25 mM CH3COOK) media. Study of oxidative processes in RHM by polarographic method has shown 20 mM Cd2+ to disturb activity of respiratory mitochondrial chain. The rate of endogenous respiration of isolated mitochondria in the medium with Cd2+ in the presence of malate and succinate was approximately 5 times lower than in control. In experimental preparations, addition into the medium of DNP—uncoupler of oxidation and phosphorylation did not cause an increase of the oxygen consumption rate. Thus, the obtained data indicate that a decrease in the cardiac muscle contractility caused by Cd2+ is due not only to its direct blocking action on Ca2+-channels, but also is mediated by toxic effect on rat heart mitochondria, which was manifested as an increase in ion permeability of the inner mitochondrial membrane (IMM), acceleration of the energy-dependent K+ transport into the matrix of mitochondria, and inhibition of their respiratory chain.

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Authors and Affiliations

  1. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg, Russia

    I. V. Shemarova, S. M. Korotkov & V. P. Nesterov

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  1. I. V. Shemarova
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  2. S. M. Korotkov
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  3. V. P. Nesterov
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Original Russian Text © I. V. Shemarova, S. M. Korotkov, V. P. Nesterov, 2011, published in Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, 2011, Vol. 47, No. 4, pp. 306–310.

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Shemarova, I.V., Korotkov, S.M. & Nesterov, V.P. Effect of oxidative processes in mitochondria on contractility of heart muscle of the frog Rana temporaria. Actions of Cd2+ . J Evol Biochem Phys 47, 360–365 (2011). https://doi.org/10.1134/S0022093011040074

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  • DOI: https://doi.org/10.1134/S0022093011040074

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