Abstract
Long-chain saturated α,ω-dioic acids can induce nonspecific permeability of the inner membrane (pore opening) of liver mitochondria loaded with Ca2+ or Sr2+ by the mechanism insensitive to cyclosporin A (CsA). In this work we found that 200 μM Ca2+ and 20 μM α,ω-hexadecanedioic acid (HDA) in the presence of 1 μM CsA induced high-amplitude swelling of liver mitochondria (pore opening) only in the presence of succinate as oxidation substrate. Under these conditions protonophore uncoupler of oxidative phosphorylation 2,4-dinitrophenol at the concentration of 75 μM, which is optimal for its uncoupling activity, inhibited mitochondrial swelling induced by Ca2+ and HDA, despite the presence of succinate in the incubation medium. Natural uncouplers of oxidative phosphorylation, oleic and linoleic acids, produced a similar effect. These data suggest that energization of organelles, which promotes Ca2+ transport into the matrix, is one of the basic requirements of pore opening in liver mitochondria induced by Ca2+ and HDA. It is shown that ATP at the physiological concentration of 2 mM inhibits HDA-induced high-amplitude swelling of mitochondria by reducing free Ca2+ concentration in the medium. ADP at the same concentration had a similar effect. This modulating effect of nucleotides apparently is attributable to their ability to chelate calcium ions. Polycation spermine, which is known as an inhibitor of the classical CsA-sensitive pore, at the physiological concentration of 1 mM inhibited CsA-insensitive swelling of liver mitochondria induced by sequential addition of Ca2+ and HDA. It is assumed that such action of spermine is due to its ability to shield the negative surface charges on the inner membrane of mitochondria. Bovine serum albumin (BSA), which is able to bind free fatty acids and thus prevent the induction of Ca2+-dependent pore, inhibited HDA-induced swelling of mitochondria. However, at the same BSA/fatty acid molar ratio inhibitory effect of BSA was much less pronounced if HDA was used as the pore inducer instead of palmitic acid. Apparently, this can be accounted by the fact that BSA binds α,ω-dioic acids weaker than their monocarboxylic analogues.
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Original Russian Text © M.V. Dubinin, A.A. Vedernikov, S.I. Adakeeva, E.I. Khoroshavina, V.N. Samartsev, 2013, published in Biologicheskie Membrany, 2013, Vol. 30, No. 5–6, pp. 364–371.
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Dubinin, M.V., Vedernikov, A.A., Adakeeva, S.I. et al. Physiological modulators of cyclosporin A-insensitive nonspecific permeability of the inner membrane of liver mitochondria induced by calcium ions and α,ω-hexadecanedioic acid. Biochem. Moscow Suppl. Ser. A 8, 30–36 (2014). https://doi.org/10.1134/S1990747813050036
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DOI: https://doi.org/10.1134/S1990747813050036