Ukr.Biochem.J. 2014; Volume 86, Issue 6, Nov-Dec, pp. 106-118


Functional and dynamic state of inner mitochondrial membrane of sarcoma 37 in mice under administration of sodium dichloroacetate

S. V. Khyzhnyak1, L. V. Sorokina2, L. I. Stepanova3, A. A. Kaplia4

1National University of Life and Environmental Sciences of Ukraine, Kyiv;
2R. E. Kavetsky Institute of Experimental Pathology, Oncology and Radiobiology,
National Academy of Sciences of Ukraine, Kyiv;
3ESC “Institute of Biology”, Taras Shevchenko National University of Kyiv, Ukraine;
4Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, Kyiv

The activity of enzymes of the respiratory chain and structural-dynamic properties of the inner mitochondrial membrane (IMM) of sarcoma 37 (S37) in mice under  sodium dichloroacetate (SDA) administration in a daily dose of 86 mg/kg of body weight starting from the 2nd day after tumor transplantation were investigated. The dynamic and structural state of the IMM components was determined using the fluorescent probes. With S37 growth the intensification of glycolytic metabolism occurred on the background of suppressed functional capacity of mitochondrial respiratory chain enzymes. The changes of conformational properties of protein molecules and the increase of IMM lipid phase microviscosity were shown. The administration of SDA promotes the decrease of lactate content and the increase of pyruvate dehydrogenase activity in S37. This was accompanied by further suppression of the functional activity of the respiratory chain complexes and Н+-АТРase coupled with conformational modification of protein molecules and changes of the structural orderliness of the IMM lipid phase, possibly due to intensification of reactive oxygen species generation.

Keywords: , , , , , ,


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