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Mitochondrial Models of Pathologies with Oxidative Stress. Efficiency of Alkalization to Reduce Mitochondrial Damage

N. I. Fedotcheva1,2 and E. N. Mokhova2,3*

1Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, ul. Institutskaya 3, 142290 Pushchino, Moscow Region, Russia; fax: (4967) 330-553; E-mail: nfedotcheva@mail.ru

2Lomonosov Moscow State University, Research Institute of Mitoengineering, 119991 Moscow, Russia; fax: (495) 939-5945

3Lomonosov Moscow State University, Belozersky Institute of Physico-Chemical Biology, 119991 Moscow, Russia; fax: (495) 939-3181; E-mail: mokhova@genebee.msu.ru

* To whom correspondence should be addressed.

Received July 31, 2013; Revision received August 8, 2013
Previously, we developed a method to monitor the development of oxidative stress in isolated liver mitochondria. The method is based on recording of membrane potential changes in response to sequential introduction of low concentrations (5-20 μM) of tert-butyl hydroperoxide (tBHP). It allows monitoring of the extent of amplification or attenuation of oxidative stress caused by external influences (changes in incubation conditions, additions of biologically active substances). Based on this method, we created a mitochondrial model for the study and improvement of treatment of pathologies associated with oxidative stress. The following two processes were simulated in the experiments: 1) introduction of desferal for treatment of serious diseases caused by cell overload with iron (high desferal concentrations were shown to suppress mitochondrial energetics); 2) efficiency of alkalization to reduce mitochondrial damage induced by oxidative stress. The experiments have shown that even a small increase in pH (alkalization) increases the amount of tBHP that can be added to mitochondria before the MPTP (“mitochondrial permeability transition pore”) is induced. The effect of alkalization was shown to be close to the effect of cyclosporin A in the pH range 7.2-7.8. The mechanism of the similarities of these effects in the organism and in mitochondrial suspensions is explained by the increase in toxic reactive oxygen species in both systems under oxidative stress.
KEY WORDS: oxidative stress, mitochondria, tert-butyl hydroperoxide, cyclosporin A-sensitive pore, desferal, alkalization

DOI: 10.1134/S0006297913110102