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Undercarboxylated osteocalcin is associated with insulin resistance, but not adiponectin, during pregnancy

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Abstract

In mice, undercarboxylated osteocalcin (ucOC) improves beta-cell function and insulin sensitivity through adiponectin. In humans, levels of total osteocalcin (OC) and ucOC were negatively correlated with insulin resistance (IR) indices in patients with type 2 diabetes. Whether ucOC plays a role in glucose homeostasis and whether its effect is mediated through adiponectin during pregnancy is unclear. Serum levels of total OC, ucOC, and adiponectin were measured in 130 pregnant women with varying degrees of IR [gestational diabetes mellitus (GDM), n = 74 and non-GDM, n = 56]. In all participants, total OC and ucOC levels were positively correlated with HOMA-IR and HOMA-%B, and negatively correlated with QUICKI. In contrast, adiponectin levels were negatively correlated with HOMA-IR and positively correlated with QUICKI (P < 0.01, both). However, neither total OC nor ucOC was associated with adiponectin. Although none of these markers could help distinguish women with and without GDM, total OC and ucOC levels were significantly higher in non-GDM women who had 1 abnormal OGTT value than those who had all normal OGTT values. Total OC and ucOC levels were significantly correlated with insulin secretion and IR indices, but not adiponectin levels, in pregnant women. Changes in OC might be a sensitive response to increased IR during pregnancy, which was not mediated through adiponectin.

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Abbreviations

BMI:

Body mass index

GCT:

Glucose challenge test

GDM:

Gestational diabetes mellitus

HOMA:

Homeostasis model assessment

IR:

Insulin resistance

OC:

Osteocalcin

OGTT:

Oral glucose tolerance test

QUICKI:

Quantitative insulin sensitivity check index

ucOC:

Undercarboxylated osteocalcin

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Acknowledgments

This study received funding support from the Ratchadapiseksompotch Fund (RA56/022) and the Thailand Government Research Budget (011/2549), who had no role in the design, conduct, or report. We are grateful to Dr. Promphan Pruksakorn for help with the study.

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Correspondence to Lalita Wattanachanya or Weerapan Khovidhunkit.

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Srichomkwun, P., Houngngam, N., Pasatrat, S. et al. Undercarboxylated osteocalcin is associated with insulin resistance, but not adiponectin, during pregnancy. Endocrine 53, 129–135 (2016). https://doi.org/10.1007/s12020-015-0829-x

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  • DOI: https://doi.org/10.1007/s12020-015-0829-x

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