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Myocardial energy metabolism in the hypertrophied hearts of spontaneously hypertensive rats
- Source :
- Basic research in cardiology. 77(4)
- Publication Year :
- 1982
-
Abstract
- Age-related changes in the myocardial energy metabolism were studied in spontaneously hypertensive (SHR) rats of 5–25 weeks of age. Systolic blood pressure increased rapidly during 5 to 10 weeks of age (developing phase) and attained a plateau level at 10 to 15 weeks (sustained phase). Even during the developing phase, the heart was hypertrophic, as assessed by an increase in the ratio of the ventricular weight to body weight. However, myocardial contents of glycolytic intermediates and high energy phosphate compounds and thus, the myocardial energy state (phosphorylation potential) in SHR rats did not differ from those in age-matched normotensive Wistar-Kyoto (WKY) rats. The lactate/pyruvate ratio was significantly lower in SHR rats. On the other hand, during the sustained phase, cardiac hypertrophy progressed only gradually, and myocardial contents of creatine phosphate and ATP were lower, while the lactate content was higher than in WKY rats. The lactate/pyruvate ratio was elevated, while phosphorylation potential was lowered. These findings suggest that the energy state is normal during the developing phase of hypertension despite the presence of cardiac hypertrophy and the increased pressure load, whereas the energy state is at a lower level during the sustained phase of hypertension.
- Subjects :
- High-energy phosphate
Male
medicine.medical_specialty
Phosphocreatine
Physiology
Cardiomegaly
Creatine
chemistry.chemical_compound
Adenosine Triphosphate
Physiology (medical)
Internal medicine
Pyruvic Acid
Medicine
Animals
Glycolysis
Lactic Acid
Phosphorylation
Pyruvates
Glycogen
business.industry
Myocardium
Rats, Inbred Strains
Rats
Blood pressure
Endocrinology
chemistry
Hypertension
Lactates
Pyruvic acid
Cardiology and Cardiovascular Medicine
business
Energy Metabolism
Adenosine triphosphate
Subjects
Details
- ISSN :
- 03008428
- Volume :
- 77
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- Basic research in cardiology
- Accession number :
- edsair.doi.dedup.....1fa0cdfb445858a20e68cac7d789ef95