Structural and functional pathological characteristics of pressure-overload induced heart failure mouse model
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1.College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China. 2. Guangdong Laboratory Animals Monitoring Institute, Guangdong Key Laboratory for Laboratory Animals, Guangzhou 510633

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    Abstract:

    Objective To establish a heart failure model in mice, and to use ultrasound imaging and pathology techniques to comprehensively evaluate the characteristics of cardiac function and structural changes during disease development. Methods The transverse aortic constriction ( TAC) surgical technique was used to establish a model of pressure-overload-induced heart failure in mice. Blood flow Doppler spectra were collected to evaluate the pressure at the aortic arch stenosis before surgery and at weeks 2, 4, and 8 after it. B-mode and M-mode ultrasound images were collected to evaluate cardiac structure and systolic function. The blood flow Doppler spectrum from the mitral valve orifice and tissue Doppler spectrum from the mitral annulus were combined to evaluate cardiac diastolic function, and cardiac tissues were collected for histopathological observation. Results The ultrasound result showed that the blood pressure of the aortic arch stenosis increased significantly at weeks 2, 4, and 8 after the operation. At 2 weeks after the operation, the thickness of the left ventricular wall typically showed compensatory increases, while the inner diameter was decreased, accompanied by impaired diastolic function and myocardial fibrosis. Four weeks after the operation was the transition period, which was mainly manifested as a transition of the left ventricle from hypertrophy to dilation, decreased systolic function, continuously impaired diastolic function, and further fibrosis in the myocardium. Eight weeks after surgery, the ventricle was characterized by cavity enlargement, significant reductions of systolic and diastolic function, and cardiomyocytes being partially lysed and significantly fibrotic. Conclusions By evaluating the structure and function of the left ventricle in the three stages of compensated hypertrophy, transitional stage, and decompensated dilatation of a TAC-induced heart failure model in mice, the use of the model should advance basic research and translational medicine.

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History
  • Received:April 22,2020
  • Revised:
  • Adopted:
  • Online: November 25,2020
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