Polymer Kernels as Compact Carriers for Suspended Cardiomyocytes.

Area of Science:

• Biomaterials Science
• Cardiovascular Research
• Stem Cell Biology

Background:

• Induced pluripotent stem cells (iPSCs) offer patient-specific cardiomyocytes for cardiac repair, avoiding immune rejection.
• Intramyocardial injection of cardiomyocytes faces challenges in cell survival and electrophysiological coupling with host tissue.
• Current cell suspension methods lack control over cell adhesion and integration.

Purpose of the Study:

• To investigate the use of polymer kernels to enhance cardiomyocyte survival and integration after intramyocardial injection.
• To demonstrate the ability of polymer kernels to promote cell adhesion and electrophysiological coupling.
• To establish a proof of concept for controlling cell engraftment using smart biomaterials.

Main Methods:

• Utilizing biocompatible, subcellular-sized polymer fiber fragments (kernels) adsorbed onto cardiomyocytes.
• Employing optical excitation markers to assess cardiomyocyte excitability.
• Evaluating in vitro electrophysiological coupling between polymer kernel-modified cardiomyocytes.

Main Results:

• Polymer kernels were successfully adsorbed to cardiomyocytes, forming adhesion foci and supporting cellular structure.
• Restoration of cardiomyocyte excitability in suspension was observed upon polymer kernel adsorption.
• Increased likelihood of stable electrophysiological coupling in vitro was achieved.

Conclusions:

• Polymer kernels can be used to influence cell adhesion and electrophysiological coupling of injected cardiomyocytes.
• This approach offers a potential strategy to control the stochastic engraftment of suspension cells.
• Smart biomaterials show promise for improving cardiac cell replacement therapies.