The Effects of Hyperthyroidism on Lipid Peroxidation, Erythrocyte Glutathione and Glutathione Peroxidase
The aim of this study was to determine if lipid peroxidation, glutathione, and glutathione peroxidase levels can be effected by hyperthyroidism. Twenty-three subjects with hyperthyroidism (18 females/5 males), and 19 euthyroid subjects (11 females/8 males) were examined in this study. Plasma and erythrocytes malondialdehyde (MDA), erythrocytes glutathione (GSH) and glutathione peroxidase (GSH-PX) were measured. Results show that an increase in lipid peroxidation was observed in the hyperthyroid patients (p < 0.001). This was accompanied by a decrease in glutathione and glutathione peroxidase in the same subjects (p < 0.001). The results suggest that hyperthyroidism has some effects on lipid peroxidation and free radical scavengers.
Abdellah Ali, Phalisteen Sultan, Mohamed El-Napoli and Mohamed Fahmy
Lipoprotein Metabolism Abnormalities in Patients with Chronic Renal Insufficiency
Patients with chronic renal insufficiency (CRI) on hemodialysis develop lipoprotein abnormalities that may contribute to increased risk for atherosclerosis. The objective of this study was to assess the atherogenic risk of chronic renal insufficiency patients and dialysis treated patients (DTP) by measuring total cholesterol (TC), triglycerides (TG), HDL-cholesterol (HDL-C), LDL-cholesterol (LDL-C) and calculating the risk factor ratio: TC/HDL-C and LDL-C/HDL-C. The examined group consisted of 18 chronic renal insufficiency patients and 60 patients on hemodialysis. The results were compared to a control group of 85 voluntary blood donors. Serum lipid parameters were examined by standard methods. All lipid parameters in hemodialysis patients were statistically different as compared to the control group (p<0.05) while chronic renal insufficiency patients showed significant difference only in triglycerides and HDL-cholesterol. Hypertriglyceridemia was present in both examined groups of patients and HDL-cholesterol was lower within both groups. All calculated atherogenic ratios were higher for patients than the control group. Lipid parameters were compared between chronic renal insufficiency and hemodialysis patients, but statistically significant difference was obtained only for HDL-cholesterol (p<0.05). The increased values of triglycerides and lower HDL-cholesterol in chronic renal insufficiency patients contribute to high incidence of cardiovascular disease. Chronic renal insufficiency patients have impaired reverse cholesterol transport from peripheral cells to lipoproteins, decreased levels of HDL-cholesterol, hypertriglyceridemia prevalence of small, dense LDL and increased levels of potentially atherogenic remnant particles.