CLINICAL STUDY: ATHEROSCLEROSIS
Postprandial endothelial activation in healthy subjects and in type 2 diabetic patients: Role of fat and carbohydrate meals
Francesco Nappo, MD*,
Katherine Esposito, MD ,
Michele Cioffi, MD ,
Giovanni Giugliano*,
Anna Maria Molinari, MD ,
Giuseppe Paolisso, MD*,
Raffaele Marfella, MD* and
Dario Giugliano, MD* ,*
* Department of Geriatrics and Metabolic Diseases, Second University of Naples, Naples, Italy
Cardiovascular Research Center, Second University of Naples, Naples, Italy
Department of General Pathology, Chair of Clinical Pathology, Second University of Naples, Naples, Italy
Manuscript received August 10, 2001;
revised manuscript received December 18, 2001,
accepted January 9, 2002.
* Reprint requests and correspondence: Dr. Dario Giugliano, Via Emilia 1, 80021 AFRAGOLA (NA), Italy. dario.giugliano{at}unina2.it
OBJECTIVES: To compare the effect of a high-fat meal and a high-carbohydrate meal (pizza), with and without antioxidant vitamins, on endothelial activation in healthy subjects and in patients with type 2 diabetes mellitus.
BACKGROUND: The postprandial state is becoming increasingly acknowledged to affect some early events of atherogenesis.
METHODS: In a randomized, observer-blinded, crossover study, 20 newly diagnosed type 2 diabetic patients and 20 age- and gender-matched healthy subjects received two meals at one-week intervals: a high-fat meal (760 calories) and an isoenergetic high-carbohydrate meal (non-cheese pizza). In all subjects, the same meals were repeated immediately following ingestion of vitamin E, 800 IU, and ascorbic acid, 1,000 mg.
RESULTS: In normal subjects, the high-fat meal increased the plasma levels of tumor necrosis factor- (TNF- ), interleukin-6 (IL-6), intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1), which were prevented by vitamins. No change in these parameters occurred after pizza ingestion or pizza ingestion with vitamins. In diabetic patients, basal concentrations of glucose, cytokines and adhesion molecules were significantly higher than in nondiabetic controls. Both meals significantly increased cytokine and adhesion molecule levels, but the increase was more sustained following the high-fat meal. There was no significant change from baseline when vitamin supplementation accompanied each meal. There was a relationship between changes in serum triglycerides and changes in TNF- (r = 0.39, p < 0.01), IL-6 (r = 0.28, p < 0.05) and VCAM-1 (r = 0.25, p < 0.05), and between changes in plasma glucose and changes in IL-6 (r = 0.36, p < 0.01) and ICAM-1 (r = 0.31, p < 0.02).
CONCLUSIONS: An oxidative mechanism mediates endothelial activation induced by post-meal hyperlipidemia and hyperglycemia.
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Abbreviations and Acronyms
| | ICAM-1 | | intercellular adhesion molecule-1 | | IL-6 | | interleukin-6 | TNF- | | tumor necrosis factor-alpha | | VCAM-1 | | vascular cell adhesion molecule-1 |
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