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Related Experiment Video

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Assessment of Cardiac Function and Energetics in Isolated Mouse Hearts Using 31P NMR Spectroscopy
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Normal cardiac function in mice with supraphysiological cardiac creatine levels.

Lucia Santacruz1, Alejandro Hernandez, Jeffrey Nienaber

  • 1Department of Surgery, Duke University Medical Center, Durham, North Carolina;

American Journal of Physiology. Heart and Circulatory Physiology
|November 26, 2013
PubMed
Summary

Elevated cardiac creatine content in transgenic mice did not impair heart function or lifespan. These mice offer a model to study creatine

Keywords:
cardiac failurecreatine transporterenergy metabolismphosphocreatins

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Area of Science:

  • Cardiovascular Biology
  • Biochemistry
  • Genetics

Background:

  • Decreased creatine and phosphocreatine levels are linked to heart failure severity and poor outcomes.
  • Previous studies showed adverse effects of significantly elevated creatine in mouse models.

Purpose of the Study:

  • To investigate the effects of elevated cardiac creatine content on cardiac function under normal physiological conditions.
  • To create and characterize a transgenic mouse model overexpressing the human creatine transporter (CrT) in cardiac muscle.

Main Methods:

  • Generated transgenic mice overexpressing human CrT in the heart using the α-myosin heavy chain promoter.
  • Quantified transgene expression (qRT-PCR, Western blot, immunohistochemistry).
  • Measured high-energy phosphate metabolites and assessed cardiac function (echocardiography, pressure-volume loops) in transgenic vs. wild-type mice.

Main Results:

  • Transgenic mice exhibited 5.7-fold higher creatine and 4.7-fold higher free ADP.
  • Initially elevated phosphocreatine and ATP in young mice declined to control levels by 8 weeks.
  • Mild cardiac hypertrophy was observed, but overall cardiac function and lifespan remained normal.

Conclusions:

  • Transgenic mice with elevated cardiac creatine content show normal cardiac function and lifespan.
  • This model is suitable for investigating the therapeutic potential of increased creatine in cardiac diseases.