Morphometric analysis demonstrates that metabolically active cardiac triglycerides are 1H NMR visible

Area of Science:

• Cardiovascular Science
• Biochemistry
• Medical Imaging

Background:

• Myocardial triglyceride content is a crucial determinant of cardiac function and metabolism.
• Understanding the relationship between triglyceride levels and observable signals is vital for diagnosing cardiac conditions.

Purpose of the Study:

• To investigate the correlation between myocardial triglyceride content and 1H NMR visible fatty acid resonance intensity.
• To explore the metabolic activity and characteristics of these NMR-visible fatty acids.

Main Methods:

• Rats were fed a diet enriched with rapeseed oil to induce hypertriglyceridemia.
• Cardiac triglyceride levels were quantified using thin-layer chromatography.
• 1H NMR spectroscopy was employed to measure fatty acid resonance intensity and relaxation times.
• Perfusion studies were conducted to assess the metabolic activity of cardiac fatty acids.
• Morphometric analysis was performed to correlate lipid droplet volume with NMR signal intensity.

Main Results:

• Rapeseed oil diet significantly increased myocardial triglyceride levels and lipid droplet volume.
• A marked increase in 1H NMR visible fatty acid resonance intensity was observed, correlating with triglyceride content.
• The fatty acids were metabolically active, showing decreased NMR signal intensity upon perfusion with glucose.
• Perfusion with glucose and acetate largely preserved the NMR signal intensity, indicating substrate utilization.

Conclusions:

• Metabolically active cardiac fatty acid stores, likely triglycerides, are detectable by 1H NMR spectroscopy.
• 1H NMR spectroscopy shows potential as a non-invasive tool for studying myocardial triglyceride metabolism.
• This technique could aid in the future diagnosis and management of metabolic heart diseases.