Prediabetes is Characterized by Higher FGF23 Levels and Higher Prevalence of Vitamin D Deficiency Compared to Normal Glucose Tolerance Subjects

In this study, 80 patients with mean age 50.4±10.6 years were included, divided into 2 age- and BMI-matched groups – group 1 with obesity without glycemic disturbances (n=41) and group 2 with obesity and prediabetes (n=39). Oral glucose tolerance test (OGTT) with measurement of immunoreactive insulin was performed in all participants and levels of PTH, 25(OH)D, FGF23, and Klotho were measured. We found significantly higher levels of FGF23 in patients with prediabetes compared to normal glucose tolerance subjects (10.4±10.7 vs. 5.8±7.3 pg/ml; p=0.03). FGF23 showed a weak positive correlation to fasting blood glucose (r=0.224; p=0.048) but not to blood glucose on the first and second hour of oral glucose tolerance test or insulin levels. There was extremely high prevalence of vitamin D deficiency in both groups. Lower levels of 25(OH)D were observed in prediabetes group, although without statistical significance (p=0.57). Patients with prediabetes have higher FGF23 levels and higher prevalence of vitamin D deficiency compared to normal glucose tolerance subjects. Elevated FGF23 levels seem to be correlated more to elevated fasting blood glucose levels than to insulin resistance state of the patients. [...] © Georg Thieme Verlag KG Stuttgart · New YorkArticle in Thieme eJournals: Table of contents  |  Abstract  |  Full text
Source: Hormone and Metabolic Research - Category: Endocrinology Authors: Tags: Endocrine Care Source Type: research