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Glucose homeostasis, beta cell function, and insulin resistance in relation to vitamin D status after gestational diabetes mellitus.

Glucose homeostasis, beta cell function, and insulin resistance in relation to vitamin D status after gestational diabetes mellitus.
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Shaat N, Ignell C, Katsarou A, Berntorp K,


Shaat N, Ignell C, Katsarou A, Berntorp K, (click to view)

Shaat N, Ignell C, Katsarou A, Berntorp K,

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Acta obstetricia et gynecologica Scandinavica 2017 03 09() doi 10.1111/aogs.13124
Abstract
INTRODUCTION
We wanted to determine vitamin D status after gestational diabetes mellitus (GDM) and to evaluate whether levels of 25-hydroxyvitamin D3 (25OHD3 ) are associated with beta cell function, insulin resistance, or a diagnosis of diabetes after GDM.

MATERIAL AND METHODS
Glucose homeostasis was assessed during a 75-g oral glucose tolerance test 1-2 years after delivery in 376 women with previous GDM (287 European and 78 non-European, including 33 Arab and 35 Asian women). Insulin resistance was estimated using homeostasis model assessment of insulin resistance (HOMA-IR). The insulinogenic index (I/G30) and the disposition index [(I/G30)/HOMA-IR] were used to calculate insulin secretion. Concentrations of serum 25OHD3 were determined.

RESULTS
Mean (± SD) 25OHD3 concentration was 50.0 ± 22.3 nmol/L and differed significantly among subgroups of body mass index, ethnicity, and glucose tolerance status; 53% had 25OHD3 levels <50 nmol/L and 87% had 25OHD3 levels <75 nmol/L. There was a negative correlation between 25OHD3 concentration and HOMA-IR (p<0.001) and a positive correlation between 25OHD3 and disposition index (p=0.002) in univariable regression analysis. Correlations attenuated after adjustment for body mass index. In univariable regression analysis, 25OHD3 concentrations were significantly associated with diabetes after GDM (p=0.004). However, in a multivariable model non-European origin, HOMA-IR, and insulinogenic index were significantly associated with post-partum diabetes whereas 25OHD3 concentrations were not. CONCLUSION
Vitamin D deficiency/insufficiency in previous GDM cases appears to be associated with beta cell dysfunction and insulin resistance, but not with post-partum diabetes when factors well known to influence type-2 diabetes were adjusted for. This article is protected by copyright. All rights reserved.

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