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Journal of Bioenergetics and Biomembranes

, Volume 45, Issue 6, pp 531–539 | Cite as

Tl+ induces both cationic and transition pore permeability in the inner membrane of rat heart mitochondria

  • Sergey M. Korotkov
  • Vladimir P. Nesterov
  • Irina V. Brailovskaya
  • Viktor V. Furaev
  • Artemy V. Novozhilov
Article

Abstract

Effects of Tl+ were studied in experiments with isolated rat heart mitochondria (RHM) injected into 400 mOsm medium containing TlNO3 and a nitrate salt (KNO3 or NH4NO3) or TlNO3 and sucrose. Tl+ increased permeability of the inner membrane of the RHM to K+ and H+. This manifested as an increase of the non-energized RHM swelling, in the order of sucrose < K+ < NH4 +, respectively. After succinate administration, the swollen RHM contracted. The Tl+-induced opening of the mitochondrial permeability pore (MPTP) in Ca2+-loaded rat heart mitochondria increased both the swelling and the inner membrane potential dissipation, as well as decreased basal state and 2,4-dinitrophenol-stimulated respiration. These effects of Tl+ were suppressed by the MPTP inhibitors (cyclosporine A, ADP, bongkrekic acid, and n-ethylmaleimide), activated in the presence of the MPTP inducer (carboxyatractyloside) or mitoKATP inhibitor (5-hydroxydecanoate), but were not altered in the presence of mitoKATP agonists (diazoxide or pinacidil). We suggest that the greater sensitivity of heart and striated muscles, versus liver, to thallium salts in vivo can result in more vigorous Tl+ effects on muscle cell mitochondria.

Keywords

Tl+ Ca2+ Mitochondrial permeability transition Mitochondrial bioenergetics Mitochondrial swelling Rat heart mitochondria 

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Sergey M. Korotkov
    • 1
  • Vladimir P. Nesterov
    • 1
  • Irina V. Brailovskaya
    • 1
  • Viktor V. Furaev
    • 1
  • Artemy V. Novozhilov
    • 1
  1. 1.Sechenov Institute of Evolutionary Physiology and Biochemistrythe Russian Academy of SciencesSt. PetersburgRussia

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