European Heart Journal Advance Access published online on July 4, 2008
European Heart Journal, doi:10.1093/eurheartj/ehn295
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Epidermal fatty-acid-binding protein: a new circulating biomarker associated with cardio-metabolic risk factors and carotid atherosclerosis
1 Department of Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Queen Mary Hospital, 102 Pokfulam Road, Hong Kong, China
2 Department of Nursing, Li Ka Shing Faculty of Medicine, University of Hong Kong, China
3 Department of Pharmacology, Li Ka Shing Faculty of Medicine, University of Hong Kong, China
4 Department of Psychiatry, Li Ka Shing Faculty of Medicine, University of Hong Kong, China
5 Research Centre of Heart, Brain, Hormone, and Healthy Aging, Li Ka Shing Faculty of Medicine, University of Hong Kong, China
6 Department of Radiology, Queen Mary Hospital, HKSAR, China
Received 7 December 2007; revised 5 June 2008; accepted 11 June 2008.
* Corresponding author. Tel: +86 852 2855 4769, Fax: +86 852 2816 2187, Email: ksllam{at}hkucc.hku.hk
Aims: Epidermal fatty-acid-binding protein (E-FABP) is highly homologous to adipocyte FABP (A-FABP), which mediates obesity-related metabolic syndrome (MetS), diabetes and atherosclerosis in animals. Combined deficiency of E-FABP and A-FABP protects against the MetS and atherosclerosis in mice. This study investigated the association of serum E-FABP with cardio-metabolic risk factors and carotid atherosclerosis in humans.
Methods and results: The presence of E-FABP in human plasma was detected by tandem mass spectrometry. Serum E-FABP levels, determined by an enzyme-linked immunosorbent assay in 479 Chinese subjects (age: 55.4 ± 13.5 years; M/F: 232/247), correlated positively (P < 0.05 to <0.001, age-adjusted) with parameters of adiposity, adverse lipid profiles, serum insulin, A-FABP, and C-reactive protein levels and were higher in subjects with the MetS (P < 0.001 vs. no MetS). The association of E-FABP with the MetS was independent of A-FABP. Furthermore, serum E-FABP correlated with carotid intima-media thickness (IMT; P < 0.001) and was independently associated with carotid IMT in men (adjusted P = 0.03).
Conclusion: E-FABP is a new circulating biomarker associated with increased cardio-metabolic risk. It may contribute to the development of the MetS and carotid atherosclerosis in humans, independent of the effect of A-FABP.
Key Words: Fatty-acid-binding proteins Atherosclerosis Obesity Metabolic syndrome Risk factors