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Related Experiment Videos

Myocardial collagenase: purification and structural characterization

S C Tyagi1, J P Cleutjens

  • 1Department of Internal Medicine, University of Missouri, Columbia, 65211, USA.

The Canadian Journal of Cardiology
|February 1, 1996
PubMed
Summary

This study purified myocardial interstitial collagenase (matrix metalloproteinase-1), revealing its presence and potent collagen-degrading activity in rat hearts. This finding highlights its role in cardiac tissue remodeling and provides a method for its preparation.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cardiovascular Research

Background:

  • Interstitial collagenase, matrix metalloproteinase-1 (MMP-1), is crucial for extracellular matrix turnover.
  • The role and regulation of MMP-1 in the myocardium are not well understood.
  • Myocardial MMP-1 may significantly influence cardiac tissue remodeling.

Purpose of the Study:

  • To purify and characterize myocardial collagenase (MMP-1) from rat hearts.
  • To investigate the nature and activity of this neutral proteinase in the myocardium.
  • To establish a purification protocol for routine MMP-1 preparation from tissue sources.

Main Methods:

  • Purification of myocardial collagenase using Sephacryl S-200 gel filtration and type I collagen-Sepharose affinity chromatography.

Related Experiment Videos

  • Characterization by SDS-PAGE, zymography, immunoblot analysis, and Western blot using anti-proMMP-1 antibody.
  • Sequence analysis of cyanogen bromide-digested fragments.
  • Assay of substrate specificity against fluorescent-labelled type I collagen.

    • Main Results:

    • A 54 kDa polypeptide chain representing myocardial interstitial collagenase was purified to homogeneity.
    • The purified enzyme exhibited lytic activity, confirmed as a matrix metalloproteinase (MMP) by inhibition with 1,10-phenanthroline.
    • Sequence analysis indicated similarity to other known collagenases.
    • Activated purified collagenase rapidly degraded type I collagen with a half-time of less than 30 seconds.

    Conclusions:

    • Interstitial collagenase (MMP-1) is present in the normal adult rat myocardium.
    • Collagen turnover in the heart may be regulated by this neutral metalloproteinase.
    • A simple, effective two-step purification protocol for myocardial MMP-1 was demonstrated.