SECOND ANOXIA-REOXYGENATION DOES NOT CAUSE THE APOPTOTIC CELL DEATH OF NEONATAL CARDIOMYOCYTES: POSSIBLE ROLE OF CHANGES OF mRNA EXPRESSION OF CYTOPROTECTIVE GENES
O.V. Surova, V.E. Dosenko, V.S. Nagibin, L.V. Tumanovskaya, A.A. Moybenko
O.O.Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, Kyiv, Ukraine
DOI: https://doi.org/10.15407/fz55.01.019
Abstract
The cells death and genes expression in neonatal cardiomyocytes culture at two anoxia-reoxygenation modeling were investigated. The primary culture of neonatal cardiomyocytes was undergone 30 min of anoxia followed by 24 h (A-R1) and the second anoxia-reoxygenation – 30 min and 60 min respectively (A-R2). The percentages of living, necrotic, apoptotic and autophagic cells were determined by staining with bis-benzimide, propidium iodide and monodansylcadaverine. Anoxia-reoxygenation significantly influenced the ratio of living, necrotic, apoptotic and autophagic cells both at its first A-R1 and second A-R2 episodes. It was shown that the main mechanism of cell death after the both periods of anoxia-reoxygenation is necrosis. The changes of mRNA levels of genes of heat shock proteins HSP70 and HSP90, antiapoptotic protein Bcl2 and key regulator of au-tophagy FRAP in cardiomyocytes culture were established. The data obtained allow to make suggestion that in 24 h after the first episode of anoxia-reoxygenation A-R1 the overexpression of heat shock proteins starts the cascade of reactions that causes the necrotic cell death prevalent and the blocking of apoptotic program at second anoxia-reoxygenation A-R2.
Keywords:
gene expression
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