Skeletal muscle fat accumulation, independent of overall body fat, may contribute to hyperglycemia and insulin resistance, disorders that are highly prevalent in populations of African origin. A few studies conducted mainly in women or in small samples, also suggest that individuals of African ancestry may have increased skeletal muscle fat compared to Caucasians, independent of overall body fat. However, much remains to be learned about the epidemiology of skeletal muscle composition and its relationship to metabolic disorders, particularly in populations of African ancestry. The goal of the proposed application is to characterize the epidemiology of ectopic skeletal muscle fat. Components of skeletal muscle composition including muscle cross-sectional area, total, subcutaneous, and intermuscular adipose tissue areas, and skeletal muscle density will be measured from existing quantitative computed tomography (pQCT) scans in 2200 men of Caucasian and African descent.
The specific aims are to: (1) determine if there are ethnic differences in the distribution of skeletal muscle fat;(2) evaluate if genetic variations in the fatty-acid binding protein 4 gene contribute to skeletal muscle composition in men of African and Caucasian ancestry;and (3) to test the hypothesis that skeletal muscle fat increases with advancing age. The candidate's goals are to: (1) acquire new skills in quantitative computed tomography imaging of skeletal muscle composition;(2) become proficient in high-throughput genotyping and DMA sequence analysis;(3) obtain field experience in conducting longitudinal studies of skeletal muscle composition.

Public Health Relevance

The accomplishment of the proposed aims will greatly enhance our understanding of the epidemiology and genetics of ectopic fat infiltration in skeletal muscle and its relationship to diabetes.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Scientist Development Award - Research & Training (K01)
Project #
5K01DK083029-05
Application #
8318210
Study Section
Diabetes, Endocrinology and Metabolic Diseases B Subcommittee (DDK)
Program Officer
Hyde, James F
Project Start
2008-09-15
Project End
2013-08-31
Budget Start
2012-09-01
Budget End
2013-08-31
Support Year
5
Fiscal Year
2012
Total Cost
$120,319
Indirect Cost
$8,510
Name
University of Pittsburgh
Department
Public Health & Prev Medicine
Type
Schools of Public Health
DUNS #
004514360
City
Pittsburgh
State
PA
Country
United States
Zip Code
15213
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Miljkovic, I; Kuipers, A L; Kuller, L H et al. (2013) Skeletal muscle adiposity is associated with serum lipid and lipoprotein levels in Afro-Caribbean men. Obesity (Silver Spring) 21:1900-7
Kuipers, Allison L; Miljkovic, Iva; Kammerer, Candace M et al. (2013) Evidence for a genetic link between bone and vascular measures in African ancestry families. J Bone Miner Res 28:1804-10
Miljkovic, Iva; Cauley, Jane A; Wang, Patty Y et al. (2013) Abdominal myosteatosis is independently associated with hyperinsulinemia and insulin resistance among older men without diabetes. Obesity (Silver Spring) 21:2118-25
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Manning, Alisa K; LaValley, Michael; Liu, Ching-Ti et al. (2011) Meta-analysis of gene-environment interaction: joint estimation of SNP and SNP ýý environment regression coefficients. Genet Epidemiol 35:11-8
Miljkovic, Iva; Cauley, Jane A; Dressen, Amy S et al. (2011) Bioactive androgens and glucuronidated androgen metabolites are associated with subcutaneous and ectopic skeletal muscle adiposity among older black men. Metabolism 60:1178-85
Miljkovic, Iva; Kuipers, Allison L; Kammerer, Candace M et al. (2011) Markers of inflammation are heritable and associated with subcutaneous and ectopic skeletal muscle adiposity in African ancestry families. Metab Syndr Relat Disord 9:319-26
Miljkovic, Iva; Bodnar, Lisa M; Cauley, Jane A et al. (2011) Low prevalence of vitamin D deficiency in elderly Afro-Caribbean men. Ethn Dis 21:79-84

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