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J Nutr Sci Vitaminol (Tokyo). 2018;64(3):173-178. doi: 10.3177/jnsv.64.173.

Sex-Specific Association of Serum 25-Hydroxyvitamin D3 with Insulin Resistance in Chinese Han Patients with Newly Diagnosed Type 2 Diabetes Mellitus.

Wang W1,2, Ye S1,2, Qian L3, Xing X1.

Author information

1
Department of Endocrinology, The First Affiliated Hospital of University of Science and Technology of China (Anhui Provincial Hospital).
2
Laboratory for Diabetes, The First Affiliated Hospital of University of Science and Technology of China (Anhui Provincial Hospital).
3
Department of Radiation Oncology, The First Affiliated Hospital of University of Science and Technology of China (Anhui Provincial Hospital).

Abstract

This study aimed to explore the association between serum 25-hydroxyvitamin D (25(OH)D) and insulin resistance as well as β-cell function in Chinese Han patients with newly diagnosed type 2 diabetes mellitus (T2DM). A total of 264 patients was included in this study. Serum 25(OH)D, plasma glucose, serum insulin and other biochemical parameters were assayed. Postprandial venous blood was collected after a mixed-nutrient load. Insulin resistance was assessed by the homeostasis model assessment for insulin resistance (HOMA-IR) and Matsuda insulin sensitivity index (Matsuda ISI). The β-cell function was assessed by the homeostasis model assessment for insulin secretion (HOMA-β) and the change in insulin divided by change in glucose from 0 to 30 min (ΔI0-30/ΔG0-30). Patients were divided into three groups according to tertiles of serum 25(OH)D levels. There were significant differences in HOMA-IR and Matsuda ISI among the three groups (HOMA-IR, p=0.005; Matsuda ISI, p=0.009). Pearson correlation analyses showed that serum 25(OH)D was negatively correlated with fasting serum insulin (FIns) (r=-0.209, p=0.012) and HOMA-IR (r=-0.273, p=0.001), and positively correlated with Matsuda ISI (r=0.219, p=0.009) only in the male population. Multiple stepwise regression analyses showed that in the male population, serum 25(OH)D was an independent predictor for both HOMA-IR and Matsuda ISI before and after adjustment for confounding factors, respectively (p<0.05 for both). This study indicates the association of vitamin D with insulin resistance in male patients with newly diagnosed T2DM, which may contribute to the understanding of the mechanism underlying the onset of T2DM in the Chinese Han population.

KEYWORDS:

insulin resistance; type 2 diabetes mellitus; vitamin D; β-cell function

PMID:
29962427
DOI:
10.3177/jnsv.64.173
[Indexed for MEDLINE]
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