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The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
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The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
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The human heart is made up of three layers of tissue that are surrounded by the pericardium, a membrane that protects and confines the heart. The outermost layer, closest to the pericardium, is the epicardium. The pericardial cavity separates the pericardium from the epicardium. Beneath the epicardium is the myocardium, the middle layer, and the endocardium, the innermost layer. There are four chambers of the heart: the right atrium, the right ventricle, the left atrium, and the left ventricle.
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The tonicity of a solution determines if a cell gains or loses water in that solution. The tonicity depends on the permeability of the cell membrane for different solutes and the concentration of nonpenetrating solutes in the solution within and outside of the cell. If a semipermeable membrane hinders the passage of some solutes but allows water to follow its concentration gradient, water moves from the side with low osmolarity (i.e., less solute) to the side with higher osmolarity (i.e.,...
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Protein Isolation from the Developing Embryonic Mouse Heart Valve Region
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Animal Models for Heart Valve Research and Development.

Arash Kheradvar1, Ramin Zareian1, Shimako Kawauchi1

  • 1University of California, Irvine.

Drug Discovery Today. Disease Models
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Summary

Valvular heart disease, a progressive condition, necessitates animal models for research. This review examines current animal models for studying heart valve disease and developing treatments.

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Area of Science:

  • Cardiology
  • Translational Medicine
  • Animal Models

Background:

  • Valvular heart disease is a significant cause of cardiac issues, characterized by progressive, irreversible valve dysfunction (stenosis or regurgitation).
  • Current treatments are limited to valve repair or replacement, as pharmacological interventions cannot prevent calcification or regenerate damaged valve tissue.
  • Research focuses on understanding disease mechanisms for medical treatments and developing novel repair/replacement strategies.

Purpose of the Study:

  • To review current animal models used in heart valve disease research.
  • To provide justification for selecting specific animal models based on research objectives.
  • To highlight the importance of animal models in advancing treatments for valvular heart disease.

Main Methods:

  • Review of existing literature on animal models for valvular heart disease.
  • Categorization of models based on research focus (e.g., developmental studies vs. device development).
  • Analysis of the suitability of small and large animal models for specific research applications.

Main Results:

  • Small animal models are valuable for in vivo imaging in developmental and genetic studies of heart valve disease.
  • Large animal models, with cardiac anatomy similar to humans, are crucial for developing and testing novel valve repair and replacement devices.
  • The choice of animal model is dictated by the specific research question, from understanding disease etiology to evaluating therapeutic interventions.

Conclusions:

  • Animal models are indispensable tools in valvular heart disease research, bridging the gap between basic science and clinical application.
  • Appropriate selection of animal models, considering factors like size, anatomy, and imaging accessibility, is critical for successful research outcomes.
  • Continued development and utilization of animal models will drive innovation in medical treatments and device-based therapies for heart valve disease.