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Diabetes-induced decrease in the mRNA coding for sarcoplasmic reticulum Ca(2+)-ATPase in adult rat cardiomyocytes.

M Russ1, H Reinauer, J Eckel

  • 1Laboratory of Molecular Cardiology, Diabetes Research Institute, Düsseldorf, Federal Republic of Germany.

Biochemical and Biophysical Research Communications
|August 15, 1991
PubMed
Summary
This summary is machine-generated.

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Diabetic and obese rat hearts show reduced sarcoplasmic reticulum Ca(2+)-ATPase mRNA levels. This decrease in calcium pump gene expression may contribute to impaired heart relaxation in diabetes.

Area of Science:

  • Cardiovascular Physiology
  • Molecular Biology
  • Endocrinology

Background:

  • Diabetes and obesity are associated with cardiac dysfunction.
  • Sarcoplasmic reticulum Ca(2+)-ATPase (SERCA) is crucial for cardiac muscle relaxation.
  • Alterations in SERCA gene expression may underlie diabetic cardiomyopathy.

Purpose of the Study:

  • To investigate the mRNA levels of sarcoplasmic reticulum Ca(2+)-ATPase in two distinct models of cardiac disease: streptozotocin-induced diabetes and genetic obesity.
  • To correlate changes in Ca(2+)-ATPase mRNA with potential functional deficits in the diabetic heart.

Main Methods:

  • Isolation of ventricular myocytes from streptozotocin-diabetic rats and genetically obese (fa/fa) rats.
  • Quantification of sarcoplasmic reticulum Ca(2+)-ATPase mRNA using Northern blotting techniques.

Related Experiment Videos

  • Comparison of mRNA levels between diseased and control animal groups.

    • Main Results:

    • A single transcript for sarcoplasmic reticulum Ca(2+)-ATPase (4.12 kb) was detected in all groups.
    • Insulin-deficient (diabetic) rats exhibited a significant 51% decrease in Ca(2+)-ATPase mRNA levels compared to normal rats.
    • Genetically obese rats showed a modest 23% reduction in Ca(2+)-ATPase mRNA content relative to lean controls.

    Conclusions:

    • Reduced mRNA expression of the sarcoplasmic reticulum Ca(2+)-ATPase is evident in both diabetic and obese rat hearts.
    • These molecular changes may partially explain the observed delayed diastolic relaxation in the diabetic heart.
    • Further research is warranted to explore the therapeutic potential of targeting SERCA expression in metabolic cardiomyopathies.