Fat may accumulate around the heart in epicardial adipose tissue or inside the heart as lipid droplets (LDs).OBJECTIVE:To compare myocardial steatosis between subjects with and without coronary artery disease (CAD and non-CAD) and to identify which cells contain LDs.DESIGN:Body mass index, waist circumference, glucose, insulin, homeostasis model assessment index, leptin, adiponectin, and high-sensitivity C-reactive protein were evaluated in CAD and non-CAD subjects. Biopsies were collected from right atrial myocardium. Immunohistochemistry for perilipin (PLIN) 1 and 2 was used to characterize LDs and their localization in adipocytes or myocardial cells, respectively. Cardiomyocytes apoptosis and hypoxia inducible factor 1 alpha were obtained in a subgroup of subjects.SETTING:The study took place in a hospital.PATIENTS:Male subjects consecutively undergoing elective cardiac surgery either for coronary bypass grafting (CAD, n = 23) or for valve replacement (non-CAD, n = 18).MAIN OUTCOMES AND MEASURES:The study was designed to compare myocardial steatosis between subjects with and without coronary artery disease.RESULTS:PLIN1 and PLIN2 resulted significantly higher in CAD than in non-CAD subjects, as did apoptosis. PLIN1 was positively associated with circulating leptin, high-sensitivity C-reactive protein, and apoptosis, and negatively with adiponectin. PLIN2 was positively associated with body mass index, waist circumference, and leptin and negatively with adiponectin. After taking into account the absence/presence of hypertension, diabetes, and CAD/non-CAD, adiponectin was negatively associated with PLIN1 (r(2) = 0.532); waist circumference and adiponectin were associated with PLIN2 (r(2) = 0.399).CONCLUSIONS:Myocardial steatosis is greater in CAD than non-CAD subjects, depending on both metabolically active adipocytes interspersed among cardiomyocytes and higher fat deposition inside cardiomyocytes; serum adiponectin and waist circumference are independent predictors of myocardial steatosis.
Heart Fat Infiltration In Subjects With and Without Coronary Artery Disease / Mazzali, Gloria; Fantin, Francesco; Zoico, Elena; Sepe, Anna; Bambace, Clara; Faccioli, Silvia; Pedrotti, Martina; Corzato, Francesca; Rizzatti, Vanni; Faggian, Giuseppe; Micciolo, Rocco; Cinti, S; Santini, Francesco; Zamboni, Mauro. - In: THE JOURNAL OF CLINICAL ENDOCRINOLOGY AND METABOLISM. - ISSN 0021-972X. - 100:9(2015), pp. 3364-3371. [10.1210/jc.2015-1787]
Heart Fat Infiltration In Subjects With and Without Coronary Artery Disease
FANTIN, Francesco;ZOICO, Elena;
2015-01-01
Abstract
Fat may accumulate around the heart in epicardial adipose tissue or inside the heart as lipid droplets (LDs).OBJECTIVE:To compare myocardial steatosis between subjects with and without coronary artery disease (CAD and non-CAD) and to identify which cells contain LDs.DESIGN:Body mass index, waist circumference, glucose, insulin, homeostasis model assessment index, leptin, adiponectin, and high-sensitivity C-reactive protein were evaluated in CAD and non-CAD subjects. Biopsies were collected from right atrial myocardium. Immunohistochemistry for perilipin (PLIN) 1 and 2 was used to characterize LDs and their localization in adipocytes or myocardial cells, respectively. Cardiomyocytes apoptosis and hypoxia inducible factor 1 alpha were obtained in a subgroup of subjects.SETTING:The study took place in a hospital.PATIENTS:Male subjects consecutively undergoing elective cardiac surgery either for coronary bypass grafting (CAD, n = 23) or for valve replacement (non-CAD, n = 18).MAIN OUTCOMES AND MEASURES:The study was designed to compare myocardial steatosis between subjects with and without coronary artery disease.RESULTS:PLIN1 and PLIN2 resulted significantly higher in CAD than in non-CAD subjects, as did apoptosis. PLIN1 was positively associated with circulating leptin, high-sensitivity C-reactive protein, and apoptosis, and negatively with adiponectin. PLIN2 was positively associated with body mass index, waist circumference, and leptin and negatively with adiponectin. After taking into account the absence/presence of hypertension, diabetes, and CAD/non-CAD, adiponectin was negatively associated with PLIN1 (r(2) = 0.532); waist circumference and adiponectin were associated with PLIN2 (r(2) = 0.399).CONCLUSIONS:Myocardial steatosis is greater in CAD than non-CAD subjects, depending on both metabolically active adipocytes interspersed among cardiomyocytes and higher fat deposition inside cardiomyocytes; serum adiponectin and waist circumference are independent predictors of myocardial steatosis.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione