Interleukin-15 (IL-15) is a pro-inflammatory cytokine which signals via a specific alpha receptor subunit (IL-15R a). Increased IL-15 level has been observed in cardiovascular patients and IL-15 immunoreactivity has been detected at vulnerable atherosclerotic plaques. Due to the association between adipose tissue distribution, inflammation and coronary artery disease (CAD), we quantified IL-15 and IL-15Rα in CAD patients with different adiposity and adipose tissue distribution and we evaluated whether epicardial adipose tissue (EAT), a visceral fat depot surrounding and infiltrating myocardium, may be a source of both molecules. IL-15 and IL-15Rα proteins were quantified by enzyme-linked immunosorbent assays. Gene expression of IL-15 and IL-15Rα in EAT depots was evaluated by one colour microarray platform. EAT thickness was measured by echocardiography. Plasmatic IL-15 and IL-15Rα levels were higher in CAD than non-CAD patients. After classification according to adipose tissue distribution, IL-15 was higher in CAD patients with increased abdominal adiposity. Increased level of IL-15Rα was observed both in CAD and non-CAD patients with increased abdominal fat. EAT was a source of IL-15 and IL-15Rα and their expression was higher in CAD patients with increased EAT thickness. In conclusion, our data suggest that circulating levels of IL-15 and IL-15Rα seem to reflect visceral distribution of adipose tissue and that EAT may be a potential source of both IL-15 and IL-15Rα. Future studies on the relationship between IL-15, visceral fat and characteristics of atherosclerotic plaques could help to better understand the complex biology of this cytokine.
|Titolo:||Interleukin-15 and soluble interleukin-15 receptor α in coronary artery disease patients : association with epicardial fat and indices of adipose tissue distribution|
|Parole Chiave:||Adiposity; Aged; Aged, 80 and over; Body Fat Distribution; Coronary Artery Disease; Coronary Vessels; Female; Gene Expression; Humans; Interleukin-15; Interleukin-15 Receptor alpha Subunit; Intra-Abdominal Fat; Male; Middle Aged; Pericardium; Plaque, Atherosclerotic; Signal Transduction; Agricultural and Biological Sciences (all); Biochemistry, Genetics and Molecular Biology (all); Medicine (all)|
|Settore Scientifico Disciplinare:||Settore MED/05 - Patologia Clinica|
|Data di pubblicazione:||mar-2014|
|Digital Object Identifier (DOI):||10.1371/journal.pone.0090960|
|Appare nelle tipologie:||01 - Articolo su periodico|