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Substrate effects in the post-ischemic myocardium.

E Y Sako¹, P B Kingsley-Hickman, A H From

¹Department of Surgery, University of Minnesota, Minneapolis.

The Journal of Surgical Research

|April 1, 1988

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Glucose is a more effective substrate than pyruvate for ATP production following myocardial ischemia, as it supports glycolysis. Optimal substrate delivery post-ischemia may require multiple compounds, including glucose.

Area of Science:

Cardiology
Biochemistry
Metabolic research

Background:

Myocardial ischemia impairs ATP production.
Glycolysis's role in ATP generation during ischemia is debated.
Pyruvate bypasses glycolysis, directly fueling the TCA cycle.

Purpose of the Study:

To compare glucose and pyruvate as sole substrates post-myocardial ischemia.
To investigate substrate utilization and ATP production rates.
To assess the impact of substrate on myocardial function and metabolism.

Main Methods:

Isolated rat hearts perfused using Langendorff apparatus.
Nuclear Magnetic Resonance (NMR) spectroscopy for metabolic analysis.
Measurement of Rate Pressure Product (RPP), oxygen consumption (MVO2), and Pi-ATP rates.

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Main Results:

The unidirectional Pi-ATP rate was higher in glucose-perfused hearts, increasing post-ischemia.
Pyruvate hearts showed higher oxygen consumption at equivalent performance levels.
Glycolysis appears significant and elevated following severe ischemia.

Conclusions:

Glucose supports a higher glycolytic ATP contribution compared to pyruvate post-ischemia.
Pyruvate perfusion necessitates higher oxidative phosphorylation rates.
Optimal post-ischemic substrate strategies may involve a combination of substrates, including glucose.