Circulation. 2003;108:2460-2466
Published online before print October 27, 2003, doi: 10.1161/01.CIR.0000099542.57313.C5
Published online before print October 27, 2003, doi: 10.1161/01.CIR.0000099542.57313.C5
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(Circulation. 2003;108:2460.)
© 2003 American Heart Association, Inc.
Clinical Investigation and Reports |
Human Epicardial Adipose Tissue Is a Source of Inflammatory Mediators
From the Departments of Surgery (T.M., L.Z., J.D.M., J.T.D., H.A., Y.S.) and Medicine (A.Z., B.J.G.), Thomas Jefferson University, Philadelphia, Pa; GlaxoSmithKline (A.Z., L.S.-B., S.O., E.A.K., A.G.J.), King of Prussia, Pa; and Bryn Mawr Hospital (J.M.), Bryn Mawr, Pa.
Correspondence to Yi Shi, MD, PhD, Department of Surgery, Thomas Jefferson University, Suite 623, 1025 Walnut St, Philadelphia, PA 19107 (e-mail yi.shi{at}jefferson.edu), or Andrew Zalewski, MD, GlaxoSmithKline, King of Prussia, PA 19406 (e-mail andrew.2.zalewski@gsk.com).
Received August 19, 2003; revision received September 10, 2003; accepted September 17, 2003.
Background— Inflammatory mediators that originate in vascular and extravascular tissues promote coronary lesion formation. Adipose tissue may function as an endocrine organ that contributes to an inflammatory burden in patients at risk of cardiovascular complications. In this study, we sought to compare expression of inflammatory mediators in epicardial and subcutaneous adipose stores in patients with critical CAD.
Methods and Results— Paired samples of epicardial and subcutaneous adipose tissues were harvested at the outset of elective CABG surgery (n=42; age 65±10 years). Local expression of chemokine (monocyte chemotactic protein [MCP]-1) and inflammatory cytokines (interleukin [IL]-1ß, IL-6, and tumor necrosis factor [TNF]-
) was analyzed by TaqMan real-time reverse transcription–polymerase chain reaction (mRNA) and by ELISA (protein release over 3 hours). Significantly higher levels of IL-1ß, IL-6, MCP-1, and TNF- mRNA and protein were observed in epicardial adipose stores. Proinflammatory properties of epicardial adipose tissue were noted irrespective of clinical variables (diabetes, body mass index, and chronic use of statins or ACE inhibitors/angiotensin II receptor blockers) or plasma concentrations of circulating biomarkers. In a subset of samples (n=11), global gene expression was explored by DNA microarray hybridization and confirmed the presence of a broad inflammatory reaction in epicardial adipose tissue in patients with coronary artery disease. The above findings were paralleled by the presence of inflammatory cell infiltrates in epicardial adipose stores.
Conclusions— Epicardial adipose tissue is a source of several inflammatory mediators in high-risk cardiac patients. Plasma inflammatory biomarkers may not adequately reflect local tissue inflammation. Current therapies do not appear to eliminate local inflammatory signals in epicardial adipose tissue.
Key Words: inflammation • atherosclerosis • coronary disease
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