Combined chromium and magnesium decreases insulin resistance more effectively than either alone

卷:25

Dou, Mei ; Ma, Yan ; Ma, Ai Guo ; Han, Lei ; Song, Mi Mi ; Wang, Yan Gang ; Yao, Min Xiu ; Sun, Xiao Fang ; Li, Ying ; Gao, Shan ; Zhang, Yan

Qingdao Univ

关键词: insulin resistance;    trivalent chromium;    magnesium;    glucose transporter 4;    T lymphocytes;   

DOI  :  10.6133/apjcn.092015.48

学科分类：食品科学和技术

【 摘 要 】

Background and Objectives: Peroral supplementation with trivalent-chromium (Cr) or magnesium (Mg) has been shown to improve insulin resistance (IR). The objective of this study was to determine whether combined peroral supplementation with Cr and Mg improves IR more effectively than Cr or Mg alone. Methods and Study Design: Subjects (n=120, age range 45-59 years old) and diagnosed with IR were randomly divided into four groups and monitored for a period of 3 months: group 1 (the placebo control group), group 2 (160 mid Cr), group 3 (200 mg/d Mg), and group 4 (160 mu/d Cr plus 200 mg/d Mg). Fasting blood glucose (FBG), fasting insulin (Fins), erythrocyte Cr and Mg content, and glucose-transporter-4 (GLUT4) and glycogen-synthase-kinase-3 beta (GSK3 beta) mRNA levels in activated T-lymphocytes were measured, and insulin resistant index (IRI) was calculated. Results: Significant decreases between the baseline and study conclusion values of FBG (0.37 mmol/L, p<0.01), Fins (2.91 mu IU/mL, p<0.01) and IRI (0.60, p<0.01) were observed in group 4, but not groups 1-3. Similarly, compared with baseline, significant changes in GLUT4 (2.9-fold increase, p<0.05) and GSK3 beta (2.2-fold decrease, p<0.05) mRNA levels in activated T-lymphocyte were observed at the study's conclusion in group 4, but not in groups 1-3. Conclusions: Our results indicate that combining peroral supplementation with Cr and Mg improves IR more effectively than Cr or Mg alone, and this may be attributable to increased induction and repression, respectively, of GLUT4 and GSK3 beta expression.