Effects of vitamin A, C and E, or omega-3 fatty acid supplementation on the level of paraoxonase and arylesterase activity in streptozotocin-induced diabetic rats: an investigation of activities in plasma, and heart and liver homogenates

<p><b>INTRODUCTION</b>This study was designed and conducted to evaluate the effects of vitamin A, C and E supplementation, and omega-3 fatty acid supplementation on the activity of paraoxonase and arylesterase in an experimental model of diabetes mellitus.</p><p><b>METHODS</b>A total of 64 male Sprague Dawley® rats, each weighing 250 g, were randomly distributed into four groups: (a) normal control; (b) diabetic control; (c) diabetic with vitamin A, C and E supplementation; and (d) diabetic with omega-3 fatty acid supplementation. The animals were anaesthetised after four weeks of intervention, and paraoxonase and arylesterase activity in blood plasma, and liver and heart homogenates were measured.</p><p><b>RESULTS</b>Arylesterase activity in the heart and liver homogenates was significantly lower in the diabetic control group than in the normal control group (p < 0.01). Vitamin A, C and E supplementation, and omega-3 fatty acid supplementation significantly increased liver arylesterase activity (p < 0.05). No significant change was observed in paraoxonase activity and other investigated factors.</p><p><b>CONCLUSION</b>Vitamin A, C and E, or omega-3 fatty acid supplementation were found to increase liver arylesterase activity in streptozotocin-induced diabetic rats. These supplements may be potential agents for the treatment of diabetes mellitus complications.</p>

Evaluation of vitamin D status in newly diagnosed pemphigus vulgaris patients

Pemphigus vulgaris [PV] is an autoimmune blistering disorder of the skin or mucosa. Since low vitamin D status has been linked to many immune disorders, we designed this study to compare the vitamin D status in PV patients with healthy controls. In this case-control study, vitamin D status of 32 newly diagnosed PV patients was compared with 36 healthy control subjects. All patients were selected from the specialized dermatology departments of Razi Hospital, Tehran University of Medical Sciences in a 2-year period [2009-2010]. The severity of the disease was estimated according to Harman's scores. Serum concentration of 25[OH]D was measured by Roche Elecsys System. Data were analyzed by independent t-test. Both groups were similar based on sex, age and body mass index. The mean duration of disease was 5.57 +/- 0.93 months. The mean oral and skin severities were 1.81 +/- 0.20 and 2.31 +/- 0.17 respectively, based on Harman's scores. Serum 25[OH]D was significantly lower in PV patients compared to controls [-8.90; 95% CI, 2.29-15.51 and P = 0.009]. There was a negative correlation between vitamin D level and the oral severity of disease [r = -0.39 and P = 0.02]. PV patients had significantly lower serum level of 25[OH]D compared to healthy subjects which might contribute to worsen the disease. These data indicate the importance of improving vitamin D level in pemphigus patients

Eicosapentaenoic acid improves insulin sensitivity and blood sugar in overweight type 2 diabetes mellitus patients: a double-blind randomised clinical trial

<p><b>INTRODUCTION</b>Diabetes mellitus is the most common metabolic disorder in humans, and its incidence is increasing rapidly worldwide. Although polyunsaturated fatty acids have beneficial effects on diabetes mellitus, previous data regarding the possible positive effects of n-3 fatty acids on glycaemic indices were inconclusive. We conducted a double-blind randomised clinical trial to determine the effects of eicosapentaenoic acid (EPA), an n-3 polyunsaturated fatty acid, on overweight patients with type 2 diabetes mellitus (T2DM).</p><p><b>METHODS</b>This double-blind, placebo-controlled randomised clinical trial was conducted on a total of 67 overweight patients with T2DM for a duration of three months. Of these 67 patients, 32 received 2 g purified EPA daily, while 35 received a placebo of 2 g corn oil daily. The patients' fasting plasma glucose (FPG), serum insulin, glycated haemoglobin (HbA1c) and insulin sensitivity indices were assessed.</p><p><b>RESULTS</b>After three months of EPA supplementation, the group that received EPA showed significant decreases in FPG (p < 0.001), HbA1c (p = 0.01) and homeostasis model assessment of insulin resistance (HOMA-IR) (p = 0.032), when compared to the placebo group. EPA supplementation resulted in decreased serum insulin levels, with the levels between the EPA and placebo groups showing a significant difference (p = 0.004).</p><p><b>CONCLUSION</b>The results of our study indicate that EPA supplementation could improve insulin sensitivity. It was able to decrease serum insulin, FPG, HbA1c and HOMA-IR. EPA could have beneficial effects on glycaemic indices in patients with T2DM.</p>

Brewer's yeast improves glycemic indices in type 2 diabetes mellitus

Brewer's yeast may have beneficial effects on insulin receptors because of its glucose tolerance factor in diabetic patients. This study was conducted to investigate the effects of brewer's yeast supplementation on glycemic indices in patients with type 2 diabetes mellitus. In a randomized double blind controlled clinical trial, 84 adults [21 men and 63 women] aged 46.3 +/- 6.1 years old with type 2 diabetes mellitus were recruited and divided randomly into two groups: Supplement group receiving brewer's yeast [six 300mg tablets/day, total 1800 mg] and control group receiving placebo [six 300mg tablets/day] for 12 weeks. Body weight, height, body mass index, food consumption [based on 24h food record], fasting blood sugar [FBS], glycosylated hemoglobin, insulin sensitivity, and insulin resistance were measured before and after the intervention. Data analysis was performed using the Statistical Package for Social Sciences [version 18.0]. The changes in FBS, glycosylated hemoglobin, and insulin sensitivity were significantly different between the two groups during the study [respectively P < 0.001, P < 0.001, P = 0.02 independent sample t-test]. There was a significant difference in FBS, glycosylated hemoglobin, and insulin sensitivity at the end of the study between the two groups after removing the effects of baseline values [respectively P = 0.002, P < 0.001, P = 0.02, analysis of covariance]. Changes in body mass index, 24h food record, insulin resistance were not significant. Dietary supplementation with brewer's yeast besides the usual treatment of diabetes can ameliorate blood glucose variables in type 2 diabetes mellitus

[Evaluation of the protective effects of quercetin in biliary cirrhotic rats]

Biliary cirrhosis is a chronic disease marked by the progressive destructtion of liver. There is no known cure for this disease; however, medications may slow its progression. The present study was designed to investigate the effect of quercetin as a plant derived flavonoid on the hepatic injury reduction of biliary cirrhotic rats. Thirty male Sprague-Dawley rats aged 6-7 months were randomized into three groups of ten each. One group served as control [sham operated], while the other two groups underwent a complete bile-duct ligation [BDL]. Four weeks after the operation, serum bilirubin, alkaline phosphatase [ALP], alanine amino-transferase [ALT], and aspartate amino-transferase [AST] were measured in two BDL groups to confirm the occurrence of cirrhosis. Then one of the BDL groups received placebo and the other one injected intraperitoneally with 50 mg/kg of quercetin once a day for a period of four weeks. At the end of the study, hepatic enzymes and serum bilirubin were measured again. Liver species were tested for histological characteristics. Quercetin could decrease serum level of bilirubin [7.4 +/- 0.9 vs.8.9 +/- 1.6 mg/dL; P<0.05], ALP [1387 +/- 76.9 vs.2273 +/- 65.3 IU/L; P<0.001] and ALT [601.9 +/- 38.1 vs.644.8 +/- 37.4 IU/L; P<0.05] compared to cirrhotic group. AST was higher in cirrhotic groups compared to control both in the 4[th] and 8[th] week. However, the difference between BDL and BDL+Q groups was not statistically significant. Quercetin decreased ALT/AST ratio, as an indicator of liver damage. No significant histological changes were observed in quercetin group. These data suggest that although quercetin did not change histological characteristics of liver, it could significantly decrease bilirubin, alkaline phosphatase and alanine amino-transferase, indicating less liver injury

Brewer's yeast improves blood pressure in type 2 diabetes mellitus

This study was conducted to investigate the effects of Brewer's yeast supplementation on serum lipoproteins and blood pressure in patients with Type 2 diabetes mellitus. In a randomized double blind clinical trial, 90 adults with type 2 diabetes mellitus were recruited, and divided randomly into 2 groups, trial group received brewer's yeast [1800 mg/day] and control group received placebo for 12 weeks. Weight, BMI, food consumption [based on 24 hour food recall], fasting serum lipoproteins [Cholesterol, Triglyceride, LDL-c, HDL-c], systolic and diastolic blood pressures were measured before and after the intervention. Data analyses were performed by Statistical Package for Social Sciences ver. 18.0, and the statistical tests included Independent t-test, Paired t-test, Kolmogorov-Smirnov and analysis of covariance. This trial was registered in Iranian Registry of Clinical Trials [IRCT], No.IRCT138807062513N1. Eighty-four subjects [21 men and 63 women] aged 46.3 +/- 6.1 years completed the study. After 12 weeks supplementation, systolic and diastolic blood pressures were decreased in the group receiving brewer's yeast [4.1 +/- 1.5, P = 0.007 and 5.7 +/- 0.6, P = 0.001 respectively]. No-significant changes in LDL-c, HDL-c, Triglyceride and Cholesterol were shown. Supplementation with Brewer's yeast besides the usual treatment of type 2 diabetes mellitus can reduce systolic and diastolic blood pressures in diabetic patients