Aim. To study the oxidative damage of biopolymers (proteins and nucleic acids) in blood of patients with type 2 diabetes mellitus (DM). Materials and methods. In the blood of 50 patients with DM and 25 patients without disorders of carbohydrate metabolism were estimated: the level of oxidized low-density lipoprotein (oxLDL) by immunochemical method, the content of SH-groups in plasma proteins, the activity of Cu, Zn-superoxide dismutase (SOD) in erythrocytes, the length of telomere in leukocyte DNA, the level of 8-hydroxy-2'-deoxygunosine (8-oxo-dG) in plasma and urine. Results and discussion. It is shown that in DM patients the level of oxLDL increases and the content of SH-groups in proteins and peptides of the blood plasma decreases, which indicates the development of oxidative stress. In addition, a carbonyl-dependent modification of erythrocyte SOD was detected in DM patients, as well as oxidative DNA destruction (decrease in telomere length in leukocytes and an increase in the level of 8-oxo-dG in blood plasma and urine). Conclusion. On the basis of the definition of a complex of correct indicators, a multiple oxidative modification of biopolymers of blood (proteins and DNA) was detected in patients with DM.
Aim. To study the effect of oxidative stress and telomere length in the chromosomes of blood leukocytes in patients with coronary heart disease (CHD) on the development of cardiovascular complications.
Materials and methods. In 119 patients with CHD, the level of oxidatively modified low-density lipoproteins (ox-LDL) in blood plasma and the length of telomeres in nuclear blood cells were determined during the examination. After 5 years, a telephone survey of patients (or their relatives) was conducted to obtain data on the presence of cardiovascular complications. Telomere length was determined using quantitative real-time PCR, and the level of ox-LDL was determined by immunochemical method.
Results. It was found that reducing the length of telomeres in patients with CHD increases the risk of subsequent development of cardiovascular complications. A strong negative correlation was found between the level of ox-LDL and telomere length in the group of examined CHD patients who had cardiovascular complications after 5 years.
Conclusion. CHD patients with short telomere length and high levels of ox-LDL have an increased risk of cardiovascular complications during 5 years.
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