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The role of TNF-alpha and IL-10 in cardioprotective effect of chronic hypoxia
 Chytilová, Anna ; Bezouška, Karel (advisor) ; Hloušková, Patricie (referee)
The aim of the present study was to find out whether adaption to chronic hypoxia affects the expresion of TNF-α and IL-10 in rat myocardium. TNF-α is a proinflammatory cytokine, which amplifies inflammatory reaction, while IL-10 has opposite antiinflammatory effect. We also measured concentration of nitrotyrosine as a marker of nitrosative stress. We used male Wistar rats divided into four groups: 1) normoxic controls; 2) exposed to continous normobaric hypoxia (10% O2) for three days or 3) for three weeks and 4) exposed to intermittent normobaric hypoxia (10% O2) for three weeks with one hour daily reoxygenation. Cytosolic and membrane proteins (cytosolic and particulate fractions) were obtained from the left ventricle, right ventricle and interventricular septum. Concentrations of TNF-α and IL-10 in both fractions were measured by ELISA. Continous hypoxia increased TNF-α production in particulate fractions from all ventricular parts and decreased the ratio of IL-10/TNF-α in particulate and cytosolic fractions. Intermittent hypoxia redistributed TNF-α from cytosol into the particulate fraction and prevented the drop of IL-10/TNF-α ratio in the cytosolic fraction. The highest concentration of nitrotyrosine was found in the particulate fraction from the right ventricle after three days of hypoxia....
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