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Related Experiment Videos

Mechanisms regulating cardiac fuel selection in hyperthyroidism.

M C Sugden1, M J Holness, Y L Liu

  • 1Department of Biochemistry, Faculty of Basic Medical Sciences, Queen Mary and Westfield College, London, U.K.

The Biochemical Journal
|September 1, 1992
PubMed
Summary
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Starvation reduces heart glucose use, but hyperthyroidism enhances it by altering fuel use, not GLUT 4 expression. This suggests glucose-lipid interactions are key in cardiac metabolism.

Area of Science:

  • Biochemistry
  • Physiology
  • Metabolic Research

Background:

  • Cardiac metabolism shifts fuel utilization during starvation.
  • Hyperthyroidism alters cardiac substrate preference and energy production.

Purpose of the Study:

  • To investigate the impact of hyperthyroidism on cardiac glucose utilization during starvation.
  • To elucidate the role of GLUT 4 and glucose-lipid interactions in this process.

Main Methods:

  • Assessed fructose 2,6-bisphosphate (Fru-2,6-P2) levels.
  • Measured free and acylated carnitine ratios.
  • Quantified glucose uptake and phosphorylation using radioactive 2-deoxyglucose.
  • Determined GLUT 4 mRNA and protein expression.

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Main Results:

  • Starvation decreased Fru-2,6-P2 and glucose utilization in euthyroid rats.
  • Hyperthyroidism increased cardiac acylated carnitines but did not suppress glucose utilization.
  • Starvation's suppression of Fru-2,6-P2 and glucose utilization was attenuated in hyperthyroidism.
  • GLUT 4 expression (mRNA and protein) was not significantly altered by hyperthyroidism or starvation in a manner that explained glucose utilization changes.

Conclusions:

  • Hyperthyroidism enhances cardiac glucose utilization during starvation.
  • This effect is independent of changes in GLUT 4 expression.
  • Altered glucose-lipid interactions at the tissue level likely mediate this metabolic adaptation.