Magnesium supplementation enhances insulin sensitivity and decreases insulin resistance in diabetic rats | ||
| Iranian Journal of Basic Medical Sciences | ||
| مقاله 4، دوره 23، شماره 8، آبان 2020، صفحه 990-998 اصل مقاله (679.94 K) | ||
| نوع مقاله: Original Article | ||
| شناسه دیجیتال (DOI): 10.22038/ijbms.2020.40859.9650 | ||
| نویسندگان | ||
| Hongzhou Liu1، 2؛ Nan Li2؛ Mengmeng Jin2؛ Xinyu Miao2؛ Xinjie Zhang1؛ Wenwen Zhong* 3 | ||
| 1Department of Endocrinology, First Hospital of Handan City, No. 25 Congtai Road, Handan, Hebei Province 056002, China | ||
| 2Department of Endocrinology, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital, No. 28 Fuxing Road, Beijing 100853, China | ||
| 3Healthcare Department, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital, No. 28 Fuxing Road, Beijing 100853, China | ||
| چکیده | ||
| Objective(s): Diabetes mellitus has been suggested to be the most common metabolic disorder associated with magnesium deficiency. This study aimed to investigate the effects and mechanisms of magnesium supplementation on insulin receptor activity in elderly type 2 diabetes using a rat model and to provide experimental evidence for insulin resistance improvement by magnesium supplementation. Materials and Methods: Rat model of type 2 diabetes was developed using a high-fat diet along with low dose streptozotocin (STZ) treatment. Magnesium supplement was given orally by mixing with the high-fat diet. Serum insulin level, insulin sensitivity, and insulin receptor affinity were assessed using radioimmunoassay (RIA). Insulin receptor, insulin receptor substrate (IRS-2), and β-Arrestin-2 gene and protein expression levels were measured using immunohistochemistry and RT-PCR. Xanthine oxidase assay, thiobarbituric acid reactive substance assay (TCA method), colorimetric assay, and ELISA were used to determine the serum SOD, MDA, T-AOC, and ox-LDL levels, respectively. Results: Magnesium supplementation enhanced insulin sensitivity and decreased insulin resistance in diabetic rats mainly through increasing insulin receptor expression, affinity, and augmenting insulin receptor signaling. Magnesium supplementation also inhibited lipid peroxidation in diabetic rats and protected against pancreatic cell injury in diabetic rats. In addition, we found that β-Arrestin-2 gene expression was suppressed in diabetes, which was possibly attributed to gene methylation modification, as β-arrestin 2 promotor was rich in methylation-regulating sites. Magnesium supplementation could affect β-Arrestin-2 gene expression and methylation. Conclusion: Magnesium supplementation has a positive effect on insulin receptor activity and insulin sensitivity in type 2 diabetes. | ||
| کلیدواژهها | ||
| Insulin receptor؛ Insulin sensitivity؛ Magnesium؛ Metabolic diseases؛ Type 2 diabetes | ||
| مراجع | ||
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