Chronic myocardial infarction in the mouse: cardiac structural and functional changes

Area of Science:

• Cardiovascular Research
• Animal Models
• Cardiac Physiology

Background:

• Chronic myocardial infarction is a significant health concern.
• Understanding the long-term effects of infarction is crucial for developing effective treatments.
• Mouse models offer a valuable platform for studying cardiac disease mechanisms.

Purpose of the Study:

• To investigate the cardiac structural and functional consequences of chronic left coronary artery ligation in mice.
• To establish a reproducible model of chronic myocardial infarction in this species.
• To compare the observed changes with those previously reported in rat models.

Main Methods:

• Coronary artery ligation or sham surgery in mice.
• Morphometric analysis of left ventricular structure at multiple time points post-surgery.
• Assessment of DNA synthesis using 5'-bromo-2'-deoxyuridine incorporation.
• Measurement of left ventricular pressure and its derivatives.

Main Results:

• Left coronary artery ligation induced antero-apical infarction, leading to ventricular wall thinning and dilatation.
• Significant increases in DNA synthesis were observed in the infarct border zone, septum, and right ventricle.
• Elevated septal collagen content and altered left ventricular pressure dynamics were noted post-infarction.

Conclusions:

• Chronic coronary artery ligation is a feasible method for inducing myocardial infarction in mice.
• The study provides essential data on cardiac remodeling and functional changes in this model.
• The observed consequences of chronic myocardial infarction in mice closely resemble those in rats.