Improved cardiac function and dietary fatty acid metabolism after modest weight loss in subjects with impaired glucose tolerance.
Using a novel positron emission tomography (PET) method with oral administration of 14(R,S)-[¹⁸F]-fluoro-6-thia-heptadecanoic acid (¹⁸FTHA), we recently demonstrated that subjects with impaired glucose tolerance (IGT) display an impairment in cardiac function associated with increased myocardial uptake of dietary fatty acids. Here, we determined whether modest weight loss induced by lifestyle changes might improve these cardiac metabolic and functional abnormalities. Nine participants with IGT, enrolled in a one-year lifestyle intervention trial, were invited to undergo determination of organ-specific postprandial dietary fatty acids partition using the oral ¹⁸FTHA method, and cardiac function and oxidative metabolic index using PET [¹¹C]acetate kinetics with ECG-gated PET ventriculography before and after the intervention. The intervention resulted in significant weight loss and reduction of waist circumference, with reduced postprandial plasma glucose, insulin, and triglycerides excursion. We observed a significant increase in stroke volume, cardiac output, and left ventricular ejection fraction associated with reduced myocardial oxidative metabolic index and fractional dietary fatty acid uptake. Modest weight loss corrects the exaggerated myocardial channeling of dietary fatty acids and improves myocardial energy substrate metabolism and function in IGT subjects.
Division of Endocrinology, Department of Medicine, Université de Sherbrooke, Québec, Canada; and.
Sébastien M
SM
Labbé
Division of Endocrinology, Department of Medicine, Université de Sherbrooke, Québec, Canada; and.
Christophe
C
Noll
Division of Endocrinology, Department of Medicine, Université de Sherbrooke, Québec, Canada; and.
Thomas
T
Grenier-Larouche
Division of Endocrinology, Department of Medicine, Université de Sherbrooke, Québec, Canada; and.
Margaret
M
Kunach
Division of Endocrinology, Department of Medicine, Université de Sherbrooke, Québec, Canada; and.
Lucie
L
Bouffard
Division of Endocrinology, Department of Medicine, Université de Sherbrooke, Québec, Canada; and Department of Nuclear Medicine and Radiobiology, Université de Sherbrooke, Québec, Canada.
Serge
S
Phoenix
Department of Nuclear Medicine and Radiobiology, Université de Sherbrooke, Québec, Canada.
Brigitte
B
Guérin
Division of Endocrinology, Department of Medicine, Université de Sherbrooke, Québec, Canada; and.
Jean-Patrice
JP
Baillargeon
Division of Endocrinology, Department of Medicine, Université de Sherbrooke, Québec, Canada; and.
Marie-France
MF
Langlois
Department of Nuclear Medicine and Radiobiology, Université de Sherbrooke, Québec, Canada.
Eric E
EE
Turcotte
Division of Endocrinology, Department of Medicine, Université de Sherbrooke, Québec, Canada; and andre.carpentier@usherbrooke.ca.
André C
AC
Carpentier
D019342:Acetic Acid; D015992:Body Mass Index; D002250:Carbon Radioisotopes; D003131:Combined Modality Therapy; D004038:Diet, Reducing; D004041:Dietary Fats / Q000378:metabolism*; D005227:Fatty Acids; D005260:Female; D005462:Fluorine Radioisotopes; D018149:Glucose Intolerance / Q000209:etiology / Q000517:prevention & control*; D006352:Heart Ventricles / Q000000981:diagnostic imaging / Q000378:metabolism / Q000503:physiopathology*; D006801:Humans; D008019:Life Style; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D009765:Obesity / Q000178:diet therapy / Q000378:metabolism / Q000503:physiopathology / Q000628:therapy*; D049268:Positron-Emission Tomography; D019518:Postprandial Period; D015635:Radionuclide Ventriculography; D019275:Radiopharmaceuticals; D018487:Ventricular Dysfunction, Left / Q000000981:diagnostic imaging / Q000209:etiology / Q000517:prevention & control*; D015431:Weight Loss
D002250:Carbon Radioisotopes; D004041:Dietary Fats; D005227:Fatty Acids; D005462:Fluorine Radioisotopes; D019275:Radiopharmaceuticals; C071178:14-fluoro-6-thiaheptadecanoic acid; D019342:Acetic Acid
fatty acids; food metabolism; positron emission tomography