Human iPSC-derived heart valve-like assembloids model valve development and disease pathology

Area of Science:

• Cardiovascular Biology
• Stem Cell Biology
• Biomedical Engineering

Background:

• Current understanding of heart valve development and disease relies heavily on animal models, which exhibit limitations in fully replicating human valve physiology.
• A need exists for in vitro systems that accurately model human heart valve development and disease mechanisms.

Purpose of the Study:

• To develop and characterize a human induced pluripotent stem cell (iPSC)-derived assembloid platform that recapitulates key features of native heart valves.
• To utilize this platform for modeling human heart valve development and disease pathologies.

Main Methods:

• Generation of valve-like assembloids from human iPSCs.
• Application of mechanical forces, specific endothelial culture conditions, and fluidic shear stress.
• Modeling of genetic mutations, injury, and hyperglycemia-induced valve abnormalities.

Main Results:

• The iPSC-derived assembloids successfully mimicked in vivo heart valve features at cellular and molecular levels.
• Mechanical forces, culture conditions, and shear stress were identified as critical factors for valve induction, maintenance, and extracellular matrix stratification.
• The platform effectively modeled various human heart valve defects.

Conclusions:

• The human iPSC-derived assembloid platform provides a robust in vitro model for studying human heart valve development.
• This system facilitates the investigation of disease mechanisms underlying human heart valve pathologies.
• The platform holds potential for advancing research in cardiovascular regenerative medicine and therapeutic development.