A modified murine model for the study of reverse cardiac remodelling

Area of Science:

• Cardiovascular Research
• Animal Models
• Physiology

Background:

• Previous murine models of left ventricular hypertrophy (LVH) using suture constriction had limitations.
• A modified approach utilizing a titanium clip was investigated for improved reproducibility and efficacy.

Purpose of the Study:

• To assess a modified murine model of LVH and regression using a titanium clip for aortic banding.
• To evaluate the effectiveness and reproducibility of this technique in inducing and reversing pressure overload.

Main Methods:

• Ninety-five male C57BL/6 mice underwent minimally invasive aortic banding with a titanium clip for 3, 4, or 6 weeks.
• Hearts were assessed structurally and functionally via heart weight/body weight ratios, echocardiography, and catheterization.
• Band removal was performed after each time point to assess regression.

Main Results:

• Titanium clip banding created a significant gradient, inducing concentric LVH that progressed to dilation and impaired function by 6 weeks.
• Removal of the clip after 3 or 4 weeks allowed for LVH regression and functional recovery.
• Removal after 6 weeks resulted in irreversible cardiac dysfunction and pulmonary congestion.

Conclusions:

• The titanium clip model successfully induces and allows for the relief of pressure overload, enabling study of LVH development and regression.
• This method is a simple, effective, and reproducible alternative to suture ligation for studying murine LVH, heart failure, and regression.