Myocardial insulin resistance associated with chronic hypertriglyceridemia and increased FFA levels in Type 2 diabetic patients

Lucilla D. Monti, Claudio Landoni, Emanuela Setola, Elena Galluccio, Pietro Lucotti, Emilia P. Sandoli, Anna Origgi, Giovanni Lucignani, PierMarco Piatti, Ferruccio Fazio

Research output: Contribution to journalArticlepeer-review

Abstract

We evaluated the influence of chronic hypertriglyceridemia and endothelial dysfunction on myocardial glucose uptake (MGU) in Type 2 diabetic patients without coronary heart disease. Patients were divided into two groups according to fasting triglyceride (TG) levels: 5.4 ± 1.1 and 1.5 ± 0.3 mmol/l for high- and normal-TG groups, respectively. Five subjects were assigned to the high-TG group and 11 to the normal-TG group. Age, gender, body mass index, systolic and diastolic blood pressure, glucose, insulin, HbA1c, cholesterol, and HDL cholesterol were similar in the two groups, whereas free fatty acid (FFA) levels were higher in the high-TG group basally and at the end of the clamp. Furthermore, five healthy subjects were subjected to the same protocol and used as the control group. MGU was assessed by using 18F-labeled 2-fluoro-2-deoxy-D-glucose under hyperglycemic- hyperinsulinemic conditions. Basal endothelin-1 and nitric oxide levels were significantly higher in the high-TG group than in the normal-TG and control groups, and cGMP and maximal postischemic vasodilation were significantly decreased in the high-TG group compared with the normal-TG and control groups. However, significant alterations were found in the same parameters in the normal-TG group compared with the control group. By the end of the hyperglycemic clamp, in the high-TG group, MGU was ∼40 and 65% of that in the normal-TG and control groups. MGU negatively correlated with TG, FFA, and endothelin-1, whereas a positive correlation was found with cGMP and maximal postischemic vasodilation. In conclusion, increased TG and FFA levels are risks, in addition to Type 2 diabetes mellitus, for myocardial insulin resistance, endothelial dysfunction, and alteration of nitric oxide/cGMP levels.

Original languageEnglish
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume287
Issue number3 56-3
DOIs
Publication statusPublished - Sep 2004

Keywords

  • Endothelium
  • Free fatty acid
  • Myocardial glucose uptake
  • Positron emission tomography study
  • Triglycerides

ASJC Scopus subject areas

  • Physiology

Fingerprint Dive into the research topics of 'Myocardial insulin resistance associated with chronic hypertriglyceridemia and increased FFA levels in Type 2 diabetic patients'. Together they form a unique fingerprint.

Cite this