Scaffold-based and scaffold-free cardiac constructs for drug testing.

Area of Science:

• Cardiovascular Research
• Biomedical Engineering
• Drug Discovery

Background:

• Traditional animal testing for drug safety is costly, time-consuming, and can be unreliable due to interspecies differences.
• Current 2D cell cultures of human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) lack the complex 3D structure and interactions of native heart tissue, limiting their predictive power for drug responses.
• There is a critical need for more accurate and predictive in vitro models for evaluating drug-induced cardiotoxicity and therapeutic efficacy.

Purpose of the Study:

• To review and compare scaffold-based and scaffold-free cardiac tissue engineering approaches for creating 3D cardiac constructs.
• To discuss the application of these engineered 3D cardiac models in drug screening and cardiotoxicity assessment.
• To highlight the advantages of 3D cardiac constructs over traditional 2D cultures for evaluating drug effects.

Main Methods:

• Fabrication of three-dimensional (3D) cardiac constructs using hiPSC-CMs through tissue engineering techniques.
• Categorization of tissue engineering methods into scaffold-based (e.g., collagen, fibrin gels) and scaffold-free approaches.
• Utilizing engineered cardiac constructs for evaluating drug responses and cardiotoxicity.

Main Results:

• Scaffold-based methods provide a 3D environment that supports cardiac-specific functions and drug responses.
• Scaffold-free methods result in high cell density and enhanced intercellular interactions, mimicking native tissue more closely.
• Both approaches offer improved models for assessing drug effects compared to conventional 2D cultures.

Conclusions:

• 3D cardiac constructs engineered from hiPSC-CMs represent a significant advancement over 2D cultures for drug screening.
• Tissue engineering provides versatile strategies (scaffold-based and scaffold-free) to create physiologically relevant cardiac models.
• These advanced in vitro models hold great promise for improving the accuracy and efficiency of preclinical drug safety and efficacy evaluations, potentially reducing reliance on animal testing.