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Increased circulating fibroblast growth factor (FGF)-21 and sclerostin levels have been reported in patients with type 2 diabetes (T2D). We assessed the association of FGF-21 and sclerostin with adiposity, glycemia, and glucoregulatory measures in healthy subjects. We studied 20 normoglycemic Black and White offspring of parents with T2D. Assessments included oral glucose tolerance test, insulin sensitivity (Si-clamp), insulin secretion (homeostasis model assessment index of b-cell function [HOMA-B]), and body fat (dual-energy X-ray absorptiometry). Fasting plasma FGF-21 and sclerostin levels were measured with enzyme-linked immunosorbent assays. The participants’ mean (+SD) age was 50.4 ± 5.97 years; body mass index (BMI) 32.5 ± 5.86 kg/m2; fasting plasma glucose (FPG) 96.1 ± 5.21 mg/dL, and 2-hour postload glucose 116 ± 5.45 mg/dL. FGF-21 levels were similar in Black people vs White people (0.36 ± 0.15 ng/mL vs 0.39 ± 0.25 ng/mL), men vs women (0.45 ± 0.14 vs 0.44 ± 0.07 ng/mL), correlated positively with BMI (r = 0.23, P = .05) and waist circumference (r = 0.27, P = .04), and inversely with FPG (r = –0.26, P = .05). Sclerostin levels also were similar in Black people (33.5 ± 17.1 pmol/L) vs White people (34.2 ± 6.41 pmol/L), men vs women (35.3 ± 9.01 pmol/L vs 32.3 ± 15.8 pmol/L), and correlated inversely with FPG (r = –0.11 to –0.44) but not adiposity measures. The correlation coefficient between Si-clamp values and FGF-21 levels was –0.31 (P = .09) compared with 0.04 (P = .89) for sclerostin levels. FGF-21 and sclerostin levels were not correlated with each other or HOMA-B. Among healthy Black and White subjects, plasma FGF-21 and sclerostin showed differential associations with adiposity but concordant association with FPG levels.

Plasma FGF-21 and Sclerostin Levels, Glycemia, Adiposity, and Insulin Sensitivity in Normoglycemic Black and White Adults