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Changes in Mitochondria and Intermitochondrial Junctions of Rat Cardiomyocytes upon Adrenergic Stimulation by Isoproterenol

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Abstract

Changes in rat cardiomyocytes and their mitochondria and intermitochondrial junctions (IMJs) upon β-adrenoreceptor stimulation with isoproterenol were studied by the methods of light and electron microscopy and computer-aided morphometry. Isoproterenol injections (0.3 mg/kg for eight days) proved to induce myocardial hypertrophy, which was more pronounced in the right than in the left ventricle. In the hypertrophied cardiomyocytes of both ventricles, an adaptive response of mitochondria was observed: their ultrastructure, size, and number changed, and the number and average length of IMJs increased. A positive correlation between the degree of cell hypertrophy and the number of IMJs was revealed. The reactive properties of mitochondria, including IMJ formation, differed depending on their location in the cell (i.e., in the perinuclear, intermyofibrillar, or subsarcolemmal regions). These results suggest that the rates and intensities of adaptive compensatory processes developing in the mitochondria of cardiomyocytes exposed to β-adrenoreceptor stimulation differed in the left and right ventricles.

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Authors and Affiliations

  1. Biological Faculty, Moscow State University, Vorob'evy gory, Moscow, 119899, Russia

    L. S. Pogodina, M. V. Shornikova & Yu. S. Chentsov

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  1. L. S. Pogodina
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  2. M. V. Shornikova
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  3. Yu. S. Chentsov
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Pogodina, L.S., Shornikova, M.V. & Chentsov, Y.S. Changes in Mitochondria and Intermitochondrial Junctions of Rat Cardiomyocytes upon Adrenergic Stimulation by Isoproterenol. Biology Bulletin 30, 110–118 (2003). https://doi.org/10.1023/A:1023229003614

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