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Alteration of collagenous protein profile in congestive heart failure secondary to myocardial infarction

Abstract

The rat model of myocardial infarction is characterized by progressive cardiac hypertrophy and failure. Rats with infarcts greater than 30% of the left ventricle exhibited early and moderate, stages of heart failure 4 and 8 weeks after the occlusion of the left coronary artery, respectively. As heart failure is usually associated with remodeling of the extracellular matrix, a histological and biochemical study of cardiac collagenous proteins was carried out using failing hearts. Total collagen content in the right ventricle increased at 2, 4, and 8 weeks following occlusion of the left coronary artery whereas such a change in viable left ventricle was seen after 4 and 8 weeks. Total cardiac hydroxyproline concentration was increased in both right and left ventricular samples from the infarcted animals when compared to those of control; this increase was due to elevation of pepsin-insoluble collagen fraction. The myocardial noncollagenous/collagenous protein ratio was decreased in experimental right and left ventricular samples when compared to control samples. These findings suggest that an increase in cross-linking of cardiac collagen as well as disparate synthesis of collagenous and noncollagenous proteins occurs in this model of congestive heart, failure.

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Correspondence to Ian M. C. Dixon.

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Pelouch, V., Dixon, I.M.C., Sethi, R. et al. Alteration of collagenous protein profile in congestive heart failure secondary to myocardial infarction. Mol Cell Biochem 129, 121–131 (1993). https://doi.org/10.1007/BF00926360

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Key words

  • collagen
  • rat heart
  • congestive heart failure
  • myocardial infarction