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Related Experiment Videos

A simple method for calibrating collagenase/pronase E ratio to optimize heart cell isolation

J Y Le Guennec1, N Peineau, F Esnard

  • 1Laboratoire de Physiologie des Cellules Cardiaques et Vasculaires, CNRS EP 21, Faculté des Sciences, Tours, France.

Biology of the Cell
|January 1, 1993
PubMed
Summary

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Proteases, not collagenase, are key for isolating guinea pig heart cells. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) helps determine optimal enzyme levels for calcium-tolerant myocytes.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Cardiology

Background:

  • Isolation of viable guinea pig ventricular heart cells is crucial for physiological studies.
  • Crude collagenase preparations are commonly used but their exact composition and role in cell isolation are not fully understood.

Purpose of the Study:

  • To investigate the specific enzymatic activities responsible for guinea pig ventricular heart cell isolation.
  • To determine the role of collagenase and other proteases in the digestion process.
  • To establish a method for obtaining calcium-tolerant myocytes with preserved electrophysiological properties.

Main Methods:

  • Enzyme activity assays using Wünsch's substrate.
  • Protein content analysis via sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE).

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  • Assessment of isolated myocyte calcium tolerance and electrophysiological properties.

    • Main Results:

    • Collagenase activity was found to be minimal in the isolation process.
    • Specific protease fractions within crude collagenase preparations were identified as critical for heart tissue digestion.
    • SDS-PAGE proved effective in optimizing enzyme concentrations for isolating calcium-tolerant myocytes.

    Conclusions:

    • Non-specific proteases, rather than collagenase, are the primary enzymes involved in guinea pig ventricular heart cell isolation.
    • The SDS-PAGE method allows for precise enzyme concentration determination, yielding functional, calcium-tolerant myocytes.
    • Understanding enzyme composition is vital for reproducible cardiac cell isolation and research.