Engineering an in vitro organotypic model for studying cardiac hypertrophy

Area of Science:

• Biomedical Engineering
• Cardiovascular Research
• Cellular Biology

Background:

• Neonatal cardiomyocytes in vitro lack native heart alignment and function.
• Current models fail to recapitulate the cardiac microenvironment for studying heart failure.
• Organotypic models are needed for accurate cardiovascular disease research.

Purpose of the Study:

• To engineer an in vitro platform that mimics cardiac cell organization and function.
• To develop an organotypic model for studying cardiovascular diseases.
• To create a system that recapitulates the cellular microenvironment of the murine heart.

Main Methods:

• Fabrication of microscale ridges on silicon using ultraviolet lithography and reactive ion etching.
• Physical characterization of microstructures via scanning electron microscopy and atomic force microscopy.
• Culturing neonatal cardiomyocytes on the engineered micro-ridge platform.

Main Results:

• Cardiomyocytes exhibited global parallel alignment and elliptical nuclear morphology.
• Calcium currents demonstrated coordinated and directional propagation.
• Engineered cardiomyocytes responded to hypertrophic stimuli, showing atrial natriuretic peptide expression and increased calcium transients.

Conclusions:

• Micro-ridges provide an effective platform for in vitro cardiomyocyte studies.
• This engineered system closely resembles mammalian heart function and cellular organization.
• The platform advances the development of organotypic models for cardiovascular research.