The effect of K+ concentration on the energy metabolism in perfused rat heart.

The effect of K+ concentration on the energy metabolism in perfused rat heart. Research Abstract Details 

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The effect of K+ concentration on the energy metabolism in perfused rat heart. Abstract Text:

K Sagisaka,M Tamura,I Yamazaki,

From experiments at various perfusion pressures in hemoglobin-free perfused rat hearts, oxygen consumption and redox shift of pyridine nucleotide were found to vary linearly with cardiac work. This relation was used for analysis of the energy metabolism associated with ion pumps. Mechanical activities such as left ventricular pressure and heart rate varied with the extracellular K+ concentration. Ion-pump dependent changes in oxygen consumption and redox state of pyridine nucleotide, estimated as the difference of the values at normal (4.7 mM) and various other extracellular K+ concentrations with corrections for the change due to mechanical work, were found to vary linearly with the K+ concentration. The slope for oxygen consumption was about 0.1 mumol/min/g X wet wt per mM K+. Lactate release changed markedly but transiently, about 1 min after changing the extracellular K+ concentration, and its amount varied linearly with the K+ concentration. In the steady state, however, lactate release was almost independent of the extracellular K+ concentration, although oxidized pyridine nucleotide increased with increasing K+ concentration. Coronary flow increased with the extracellular K+ concentration. Heart rate changed little between 1 and 12 mM K+, but decreased sharply above 12 mM K+. At 20 mM K+, heart beat was arrested and approximately 40% of myoglobin was deoxygenated. The intracellular oxygen concentration was estimated to be about 10 microM even during aerobic perfusion. Similarly, Ca2+-free arrested heart was found to be in a hypoxic state. The results showed that oxygen entry into cardiac tissue is facilitated by the cardiac cycle.

The effect of K+ concentration on the energy metabolism in perfused rat heart. Publishing Authors By Initials

K Sagisaka,M Tamura,I Yamazaki,

For similar investigative techniques: chemistry, analytical: photometry: spectrophotometry research abstracts see: investigative techniques: chemistry, analytical: photometry: spectrophotometry research

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The effect of K+ concentration on the energy metabolism in perfused rat heart. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of biochemistry

VOLUME: 95

Page Numbers: 1091-103

Journal Abbreviation: J. Biochem.

ISSN: 0021-924X

DAY: 19

MONTH: Apr

YEAR: 1984

The effect of K+ concentration on the energy metabolism in perfused rat heart. Information

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LANGUAGE: eng

NlmUniqueID: 376600

The effect of K+ concentration on the energy metabolism in perfused rat heart. Keywords Mesh Terms:

KEYWORDS: Spectrophotometry

MESH TERMS: methods

Chemical & Substance for Abstract: The effect of K+ concentration on the energy metabolism in perfused rat heart. Information

Substance Name: Potassium

Registry Number: 7440-09-7

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Country: JAPAN

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MEDLINETA: J Biochem

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