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Active force in rabbit ventricular myocytes

W F Bluhm1, A D McCulloch, W Y Lew

  • 1Department of Bioengineering, University of California, San Diego, La Jolla 92093-0412, USA.

Journal of Biomechanics
|September 1, 1995
PubMed
Summary
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Force measurements in single cardiac myocytes are physiologically relevant. This study confirms that single-cell myocyte responses mirror those of whole papillary muscles, validating the model for cardiac research.

Area of Science:

  • Cardiology
  • Cellular Physiology
  • Biophysics

Background:

  • Technical advances enable force measurements in single cardiac myocytes.
  • The physiological relevance of this single-cell model requires further evaluation.
  • Comparing myocyte and multicellular muscle preparations is crucial for validation.

Purpose of the Study:

  • To evaluate the physiological relevance of force measurements in single rabbit left ventricular myocytes.
  • To compare the responses of single myocytes to stimuli with those of isolated papillary muscles.
  • To validate the use of single cardiac myocytes as a model for physiological studies.

Main Methods:

  • Single rabbit left ventricular myocytes were isolated and attached to glass plates.
  • Active force and sarcomere length were measured using a capacitive force transducer.

Related Experiment Videos

  • Myocyte responses were compared to data from isolated papillary muscles under varying conditions.

    • Main Results:

    • Stable recordings from contracting myocytes were maintained for over 1 hour.
    • Force-stimulus interval relationships in myocytes mimicked those in papillary muscles.
    • Active stresses in single myocytes were comparable to those in multicellular preparations.

    Conclusions:

    • Force measurements in single cardiac myocytes demonstrate physiological relevance.
    • The single-cell myocyte model accurately reflects responses seen in multicellular preparations.
    • This study validates the use of single cardiac myocytes for studying cardiac mechanics.