Effects of coenzyme Q10 and α-lipoic acid supplementation in fructose fed rats.

This study was conducted to investigate the effects of α-lipoic acid and coenzyme Q10 on plasma levels of lipids, asymmetric dimethylarginine, oxidative stress in fructose fed rats which provide a model of dietary-induced insulin resistance and to evaluate vascular changes developing in these rats by histologically. Male Sprague Dawley rats were used in this study. The animals were divided into 4 groups. Group 1 did not receive any medication and served as a control. Group 2 received a regular diet and water ad libitum and fructose was administered as % 10 solution in drinking water. Group 3 received α-lipoic acid (100 mg/kg/day) i.p. for 5 weeks and Group 4 received coenzyme Q10 (10 mg/kg/day) i.p. for 5 weeks. For determination of plasma asymmetric dimethylarginine, glutathione and malondialdehyde levels, high-performance liquid chromatography system was used. Homeostatic model assessment as a measure of insulin resistance was calculated. Lipid profile measurements were determined using enzymatic assay on an Auto analyzer. The high fructose diet was significantly associated with an increase in levels of plasma LDL, VLDL and total cholesterol and decrease in level of HDL cholesterol. Plasma asymmetric dimethylarginine, malondialdehyde and glutathione levels were also increase in these rats. α-lipoic acid or coenzyme Q10 supplementation was found to have some positive effect on these parameters. These findings were also demonstrated by morphological observation of the aorta. We demonstrated that administration of α-lipoic acid and coenzyme Q10 notably suppresses oxidative and nitrative stress, hyperinsulinemia, insulin resistance developing in fructose fed rats, a model of metabolic syndrome (MS). These positive effects of α-lipoic acid or coenzyme Q10 can be attributed to its antioxidant activity.

Plasma osteopontin levels in patients with Behcet's disease and psoriasis.

BACKGROUND: Behcet's disease (BD) is a chronic and recurrent systemic vasculitis marked by macrophage chemotaxis. OBJECTIVE: The present study aimed to examine the relationship between the osteopontin molecule and BD. PATIENTS AND METHODS: The study registered 60 patients with BD, as well as 50 healthy individuals and 63 patients with psoriasis as the control group. Patients with BD in our study were divided into 2 groups, with regard to mucocutaneous involvement, as active and inactive patients. In addition, patients with BD were also divided into 3 groups with regard to vascular involvement: active, inactive, and no vascular involvement. RESULTS: Plasma osteopontin (OPN) levels in active patients with BD, inactive patients with BD and patients with psoriasis were found statistically significantly elevated, in comparison to those in the healthy control group (p < 0.001, p = 0.008, p < 0.001, respectively). When active and inactive patients with BD were compared to the healthy control group with regard to vascular involvement, mean plasma OPN levels were found to be statistically significantly higher (p = 0.01, p < 0.001, respectively). CONCLUSIONS: We found that plasma levels of OPN were higher in patients with Behcet's and psoriasis.