RESUMEN
Comparative investigation of indices of lipid peroxidation and blood lipid unsaturation was carried out in 91 pediatric inpatients (aged 7 to 15) with type I diabetes mellitus and in 10 controls of the same age. Activation of free radical lipid peroxidation was shown to occur in children with diabetes mellitus. A degree of compensation of diabetes did not influence the level of hydroxyperoxides (HP) and final decay products (FP) of lipid peroxidation. In ketoacidotic decompensation HP and FP concentrations in the patients were increased as compared to those in the controls by 284 and 255%, respectively. At the same time children who were admitted in coma, demonstrated low values of blood lipid unsaturation. Insulin therapy (irrespective a drug dose) was accompanied by a 1.8-2-fold increase (p less than 0.05) in a HP level as compared to control values. Change in the level of lipid unsaturation depended upon a daily dose of insulin. In diabetes over 1 year different types of changes in lipid peroxidation and unsaturation were detected, and individual differences in their levels required a differentiated approach to therapeutic tactics.
Asunto(s)
Diabetes Mellitus Tipo 1/sangre , Peroxidación de Lípido , Lípidos/sangre , Adolescente , Niño , Enfermedad Crónica , Diabetes Mellitus Tipo 1/complicaciones , Diabetes Mellitus Tipo 1/tratamiento farmacológico , Cetoacidosis Diabética/sangre , Cetoacidosis Diabética/tratamiento farmacológico , Radicales Libres , Humanos , Insulina/uso terapéutico , Peroxidación de Lípido/efectos de los fármacosRESUMEN
Time-course variations in the accumulation of endogenous products of lipid peroxidation and the state of antioxidative enzymes--superoxide dismutase and catalase--in blood of men exposed to antiorthostatic hypokinesia (-4.5 degrees) for 120 days were investigated. It was found that bed rest led to stimulation of lipid peroxidation which was measured as increased concentrations of lipid hydroperoxides and final products of lipid peroxidation in blood. Vitamin E and drugs with a specific metabolic action produced a normalizing effect on the content of products of lipid oxidative destruction. Special exercise regimens had a similar but less significant effect.
Asunto(s)
Eritrocitos/metabolismo , Inmovilización , Peroxidación de Lípido , Peróxidos Lipídicos/sangre , Postura , Adulto , Reposo en Cama , Catalasa/sangre , Humanos , Masculino , Superóxido Dismutasa/sangre , Factores de TiempoRESUMEN
Lipid peroxidation in tissues of rats exposed to antiorthostatic hypokinesia (-15 degrees) for 60 days, heavy-load exercise (swimming) and 2-hour immobilization was investigated polarographically. Antiorthostatic hypokinesia produced activation of free-radical lipid peroxidation in skeletal muscles, myocardium and plasma which reached a peak on hypokinesia day 3 and remained elevated by day 60. Exercise and immobilization applied during hypokinesia led to an accumulation of endogenous lipid peroxidation products in skeletal muscles and in the heart, although in a lesser degree. It is postulated that during hypokinesia lipid peroxidation is most probably activated due to the following factors: increased activity of the hormonal component of the sympathicoadrenal system, accumulation of excessive quantities of free fatty acids, and reduced activity of anti-oxidant enzymes.