Piezoelectric Surface Charge and Dynamic Stimulation Synergize to Promote Cardiac Myoblast Alignment and Maturation

Area of Science:

• Biomaterials Science
• Cell Biology
• Tissue Engineering

Background:

• Cardiac tissue regeneration requires biomaterials that can guide cell behavior.
• Piezoelectric materials generate electrical signals in response to mechanical stimuli, offering potential for electroactive scaffolds.
• Poly(vinylidene fluoride) (PVDF) is a piezoelectric polymer with tunable surface properties.

Purpose of the Study:

• To investigate the impact of surface charge and mechano-electrical stimulation of PVDF on H9c2 cardiac cell behavior.
• To explore the synergistic effects of static polarization and dynamic mechanical cues on cell adhesion, proliferation, and differentiation.
• To elucidate the molecular mechanisms underlying PVDF-mediated cardiac cell fate modulation.

Main Methods:

• H9c2 cardiac cells were cultured on poled PVDF films with varying surface charges.
• Cell adhesion, proliferation (using assays), and differentiation (myotube formation) were evaluated.
• Quantitative PCR (qPCR) was used to assess the expression of cardiomyogenic markers (Actc1, Tnnt2).
• Dynamic mechanical stimulation was applied to assess synergistic effects.

Main Results:

• H9c2 cells showed preferential adhesion to poled PVDF, with increased surface charge enhancing attachment.
• Negatively charged PVDF promoted early cell proliferation, while dynamic stimulation further enhanced it, especially on positively charged PVDF.
• Myotube formation, length, width, and alignment were improved by stimulation during proliferation or differentiation phases, with negative PVDF yielding the most mature cells.
• qPCR revealed upregulation of the early marker Actc1 but not the late marker Tnnt2, indicating partial differentiation.

Conclusions:

• Surface polarization and mechano-electrical stimulation of PVDF synergistically regulate H9c2 cell adhesion, proliferation, and differentiation.
• Charge-dependent design principles for piezoelectric biomaterials can be applied to cardiac tissue regeneration.
• The study highlights the integration of electrical and mechanical signaling pathways in modulating cell fate decisions by electroactive materials.