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Age-related structural and functional characteristics of cardiac myoendocrine cells of rats in a normal state and with hereditary hypertension

  • Developmental Biology of Mammals
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Abstract

A qualitative and quantitative ultrastructural study of right atrial cardiomyocytes in WAG (normotensive control) and ISIAH (inherited stress-induced arterial hypertension) rats of different age (on day 18 of embryogenesis, on days 12 and 21 after birth, and at an age of 6 and 13 months) was performed. It was shown that, in embryos with an as yet incomplete atrial morphogenesis, secretory granules containing natriuretic peptides are actively formed, accumulated, and dissolved. In postnatal ontogeny, the secretory product is accumulated in atrial cells. In all ontogeny stages studied, the numerical density of secretory granules in the myoendocrine cells of hypertensive rats is greater and the qualitative composition of these granules is more diverse than in the control. It was established that, in atrial myocytes of ISIAH rats, the morphological signs of natriuretic peptide hypersecretion precede the development of genetically programmed high blood pressure. In adult hypertensive rats, hypertrophic and degenerative changes in myocytes are accompanied by excessive accumulation of secretory granules, some of which undergo intracellular degradation.

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Authors and Affiliations

  1. Institute of Physiology, ul. Timakova 4, Novosibirsk, 630117, Russia

    I. M. Korostyshevskaya & V. F. Maksimov

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  1. I. M. Korostyshevskaya
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  2. V. F. Maksimov
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Correspondence to I. M. Korostyshevskaya.

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Original Russian Text © I.M. Korostyshevskaya, V.F. Maksimov, 2013, published in Ontogenez, 2013, Vol. 44, No. 2, pp. 77–90.

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Korostyshevskaya, I.M., Maksimov, V.F. Age-related structural and functional characteristics of cardiac myoendocrine cells of rats in a normal state and with hereditary hypertension. Russ J Dev Biol 44, 57–68 (2013). https://doi.org/10.1134/S1062360413020045

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