Work

Fetuin-A and Change in Body Composition in Older Persons

Year: 2009

Type: article

Abstract: CONTEXT: Fetuin-A inhibits the insulin receptor in vitro. Higher serum fetuin-A concentrations are associated with type 2 diabetes longitudinally and greater adiposity in cross-sectional analyses. Whether higher fetuin-A concentrations are associated with accumulation of adiposity over time is unknown. OBJECTIVE: To determine the association of fetuin-A levels with changes in body composition over 5 yr. STUDY DESIGN: Observational cohort study nested in the Health Aging and Body Composition Study. PREDICTOR: Serum fetuin-A levels. OUTCOMES: Visceral adipose tissue (VAT), abdominal sc adipose tissue, and thigh muscle area by computed tomography, and waist circumference and body mass index were measured at baseline and again after 5 yr. Percent change and extreme change (>1.5 sds) in each measure were calculated. RESULTS: Over 5 yr, subjects lost body mass in each measure, including 6% decline in VAT. Yet each sd (0.42 g/liter) higher fetuin-A concentration was associated with a 5.5% increase in VAT over 5 yr (95% confidence interval 1.9-9.2%; P = 0.003) in models adjusted for age, sex, race, clinical site, diabetes, physical activity, triglycerides, kidney function, and the baseline VAT score. Similarly, higher fetuin-A concentrations were associated with extreme VAT gain (relative risk 1.70, 95% confidence interval 1.12-2.60, P = 0.01). Fetuin-A concentrations were not statistically significant associated with change in any other measures of body composition (P > 0.20). CONCLUSIONS: Higher fetuin-A concentrations are associated with the accumulation of VAT in well-functioning, community-living older persons. The mechanisms linking fetuin-A, VAT, and insulin resistance remain to be determined.

Source: The Journal of Clinical Endocrinology & Metabolism

DOI: 10.1210/jc.2009-0916