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Related Experiment Videos

Cell calcium, oncogenes, and hypertrophy.

E Marban1, Y Koretsune

  • 1Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.

Hypertension (Dallas, Tex. : 1979)
|June 1, 1990
PubMed
Summary
This summary is machine-generated.

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Elevated cytosolic free calcium concentration ([Ca2+]i) may trigger proto-oncogene expression, driving cardiac hypertrophy. This study suggests [Ca2+]i links high blood pressure to heart muscle growth.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Cellular Physiology

Background:

  • The precise cellular mechanisms underlying cardiac hypertrophy are not fully understood.
  • Existing research suggests a role for proto-oncogenes in the increased protein synthesis characteristic of this condition.

Purpose of the Study:

  • To investigate the hypothesis that increased cytosolic free calcium concentration ([Ca2+]i) initiates proto-oncogene expression, leading to cardiac hypertrophy.
  • To explore the role of [Ca2+]i as a potential link between elevated perfusion pressure and altered gene expression in the heart.

Main Methods:

  • Utilizing perfused ferret hearts as an experimental model.
  • Measuring changes in cytosolic free calcium concentration ([Ca2+]i) in response to altered perfusion pressure.

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Main Results:

  • Demonstrated that elevated perfusion pressure directly leads to an increase in cytosolic free calcium concentration ([Ca2+]i).
  • This finding supports the plausibility of [Ca2+]i acting as a critical mediator.

Conclusions:

  • Cytosolic free calcium concentration ([Ca2+]i) appears to be a key factor connecting the stimulus of elevated perfusion pressure to the development of hypertensive cardiac hypertrophy.
  • Further research is necessary to confirm if changes in [Ca2+]i are both necessary and sufficient for stimulating myocardial cell growth.