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Preload-induced changes in isometric tension and [Ca2+]i in rat myocardium

  • Review Article
  • Published:
Central European Journal of Biology

Abstract

Preload-induced changes of active tension and [Ca2+]i are “dissociated” in mammalian myocardium. This study aimed to describe the distinct effects of preload at low and physiological [Ca2+]o. Rat RV papillary muscles were studied in isometric conditions at 25‡C and 0.33 Hz at 1 mM (hypo-Ca group) and 2.5 mM [Ca2+]o (normal-Ca group). [Ca2+]i was monitored with fura-2/AM. Increase of preload caused a rise of active tension in hypo-Ca and normal-Ca groups whereas peak fluorescence rose significantly only at low [Ca2+]o. End-diastolic tension, end-diastolic level of fluorescence, time-to-peak tension, but not time-to-peak of Ca2+ transient, progressively increased with preload. Mechanical relaxation decelerated with preload while Ca2+ transient decay time decreased in the initial phase and increased in the late phase, resulting in a prominent “bump” configuration. The “bump” was assessed as a ratio of its area to the fluorescence trace area. It was a new finding that the preload-induced rise of this ratio was twice as large in hypo-Ca. Our results indicate that preload-induced changes in active tension and [Ca2+]i are “dissociated” in rat myocardium, with relatively higher expression at low [Ca2+]o. Ca-dependence of Ca-TnC association/dissociation kinetics is thought to be a main contributor to these preload-induced effects.

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Authors and Affiliations

  1. Laboratory of biological motility, Institute of Immunology and Physiology, Ural Branch of Russian Academy of Sciences, 620049, Ekaterinburg, Russia

    Oleg Lookin & Yuri Protsenko

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  1. Oleg Lookin
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  2. Yuri Protsenko
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Correspondence to Oleg Lookin.

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Lookin, O., Protsenko, Y. Preload-induced changes in isometric tension and [Ca2+]i in rat myocardium. cent.eur.j.biol. 6, 730–742 (2011). https://doi.org/10.2478/s11535-011-0052-6

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  • DOI: https://doi.org/10.2478/s11535-011-0052-6

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