Iranian Journal of

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Background: Vitamin D deficiency is associated with impaired insulin secretion, glucose intolerance and type 2 diabetes. This study was conducted to investigate the effects of supplementation with 50,000 IU vitamin D on improving serum vitamin D levels and insulin resistance in vitamin D insufficient or deficient type 2 diabetic patients. Methods: In this double blind randomized clinical trial, 81 type 2 diabetic patients with vitamin D levels between 10-30 ng/ml were randomly assigned to intervention (50,000 IU vitamin D3 once a week) and control (placebo once a week) groups according to gender. The study duration was 8 weeks. At the beginning and the end of study, blood samples were collected after 12 hours overnight fasting and fasting serum glucose, insulin and 25-hydroxyvitamin D were measured. Insulin resistance was obtained by HOMA-IR calculation. Results: After 8 weeks supplementation with vitamin D, 25-hydroxyvitamin D level was significantly increased and reached to normal levels in the intervention group. Fasting serum glucose and insulin concentrations and HOMA-IR were significantly decreased in the vitamin D group, but there were no significant changes in the placebo group. Conclusion: Supplementation with 50,000 IU vitamin D for 8 weeks compared to placebo can improve inadequate levels of vitamin D and glycemic indicators in vitamin D insufficient or deficient type 2 diabetic patients.

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Background: The purpose of this study was to investigate the effect of concurrent training on pre-inflammatory (IL-1β, TNF-α) and anti-inflammatory (IL-10) cytokines gene expression in women with type2 diabetes.
Methods: 18-patients (age30-38, >130 glycemic index) were selected, randomly, and divided into control (n=6) the concurrent training(diabetes, n=6) and the concurrent training (healthy, n=6)  groups. The concurrent training protocol consisted of 3 sessions resistance training per week, 8sets with 80% one maximum repetition( and the endurance training preformed with 30- minutes running (3sets×10 minutes) on a treadmill with 70-80 maximum heart rate(70-80 MHR), immediately. The leukocyte^’s IL-1β, TNF-α and IL-10 genes expression determined by the Real time-PCR technique. The quantitative expression of the cytokines gene was calculated using the 2^{-ΔΔ CT} method. The between- groups differences in variables were determined by independent t-test (permutation test) through REST software and independent one-way ANOVA.
Results: The results showed that IL-1β, TNF-α mRNA genes expression reduced significantly after the concurrent training in both the training groups in comparison to the control group (P<0.05). In addition, the results also showed that IL-10 mRNA gene expression was not expressed in leukocytes after the concurrent training in both training groups in comparison to the control group (P>0.05).
Conclusion: In conclusion, the results suggest that the concurrent training modulate IL-1β and TNF-α mRNA genes expression significantly in diabetic women but could not change IL-10 genes expression. This type of exercise training seems to be more effective in reducing the expression of pro-inflammatory cytokines than in enhancing anti-inflammatory cytokines.