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Metabolic remodeling in the aging heart
Jessica Sample1, John G F Cleland, Anne-Marie L Seymour
1Department of Biological Sciences, The University of Hull, Cottingham Road, Kingston-upon-Hull HU6 7RX, UK.
Journal of Molecular and Cellular Cardiology
|December 6, 2005
Summary
Aging hearts show altered fuel use, with increased palmitate and decreased lactate oxidation in senescent rats. This metabolic shift correlates with reduced cardiac function, potentially contributing to heart failure.
Area of Science:
- Cardiovascular Physiology
- Metabolic Biochemistry
- Aging Research
Background:
- Cardiac function declines with age.
- Myocardial substrate utilization patterns change during senescence.
- Age-related heart failure is a growing clinical concern.
Purpose of the Study:
- To investigate how aging affects myocardial substrate utilization.
- To correlate metabolic changes with cardiac function in aging hearts.
- To understand the role of substrate metabolism in age-related cardiac dysfunction.
Main Methods:
- Utilized isovolumic Langendorff perfusion in male Wistar rat hearts (6, 15, 24 months).
- Employed 13C-labeled palmitate and either lactate or glucose as substrates.
- Performed 13C-NMR glutamate isotopomer analysis to quantify oxidative metabolism.
Main Results:
- Senescent (24-month) hearts showed significantly increased palmitate oxidation compared to mature (6-month) hearts.
- Lactate oxidation was significantly depressed in senescent hearts.
- Metabolic remodeling was associated with a marked decline in cardiac function and efficiency.
Conclusions:
- Aging induces significant adaptations in myocardial substrate utilization.
- Altered substrate metabolism during senescence may contribute to age-related heart failure.
- Targeting metabolic pathways could be a strategy to mitigate age-related cardiac dysfunction.