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01-01-2009 | Research Article

Mechanism of Reduced Myocardial Glucose Utilization During Acute Hypertriglyceridemia in Rats

Authors: Sébastien L. Ménard, Xiuli Ci, Frédérique Frisch, François Normand-Lauzière, Jules Cadorette, René Ouellet, Johannes E. Van Lier, François Bénard, M’hamed Bentourkia, Roger Lecomte, André C. Carpentier

Published in: Molecular Imaging and Biology | Issue 1/2009

Abstract

Purpose

The purpose of the research is to study the effect of acute inhibition of intravascular lipolysis on myocardial substrate selection during hypertriglyceridemia using in vivo radiotracer analysis and positron emission tomography.

Procedures

We induced acute hypertriglyceridemia in vivo using an intravenous infusion of Intralipid 20% (IL) without and with acute inhibition of fatty acid delivery from circulating triglycerides with injection of Triton WR-1339 (TRI) during a euglycemic–hyperinsulinemic clamp in Wistar rats. We determined the effect of TRI on myocardial uptake of circulating triglycerides and free fatty acids using intravenous injection of [³H]-triolein and [¹⁴C]-bromopalmitate, respectively. Myocardial blood flow, oxidative metabolism, and metabolic rate of glucose (MMRG) were determined using micro-positron emission tomography (μPET) with [¹³N]-ammonia, [¹¹C]-acetate, and 2-deoxy-2-[F-18]fluoro-d-glucose (FDG).

Results

TRI reduced myocardial incorporation of [³H]-triolein but not [¹⁴C]-bromopalmitate showing that it selectively reduces myocardial fatty acid delivery from circulating triglycerides but not from free fatty acids. IL reduced myocardial blood flow and MMRG by 37% and 56%, respectively, but did not affect myocardial oxidative metabolism. TRI did not abolish the effect of IL on myocardial blood flow and MMRG.

Conclusions

Hypertriglyceridemia acutely reduces myocardial blood flow and MMRG in rats, but this effect is not explained by increased myocardial fatty acid delivery through intravascular triglyceride lipolysis.

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Title: Mechanism of Reduced Myocardial Glucose Utilization During Acute Hypertriglyceridemia in Rats
Authors: Sébastien L. Ménard
Xiuli Ci
Frédérique Frisch
François Normand-Lauzière
Jules Cadorette
René Ouellet
Johannes E. Van Lier
François Bénard
M’hamed Bentourkia
Roger Lecomte
André C. Carpentier
Publication date: 01-01-2009
Publisher: Springer-Verlag
Published in: Molecular Imaging and Biology / Issue 1/2009
Print ISSN: 1536-1632
Electronic ISSN: 1860-2002
DOI: https://doi.org/10.1007/s11307-008-0171-2

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Mechanism of Reduced Myocardial Glucose Utilization During Acute Hypertriglyceridemia in Rats

Abstract

Purpose

Procedures

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Procedures

Results

Conclusions

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