Fibrin gel enhanced trilayer structure in cell-cultured constructs

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Optimizing cell seeding and substrate support is crucial for effective tissue engineering, particularly for heart valve development.
• Fibrin gel offers potential as a cell carrier, enhancing cell adhesion, interaction, and growth within engineered scaffolds.
• Trilayer polycaprolactone (PCL) substrates mimic native heart valve leaflet structure, providing a foundation for tissue regeneration.

Purpose of the Study:

• To evaluate the efficacy of fibrin gel as a cell carrier in enhancing valvular interstitial cell proliferation and extracellular matrix production.
• To assess the impact of fibrin gel on cell orientation and tissue development within trilayer PCL substrates.
• To determine the suitability of this combined approach for creating functional, native-like heart valve leaflet constructs.

Main Methods:

• Valvular interstitial cells were seeded onto trilayer PCL substrates using fibrin gel as a cell carrier.
• Cell-cultured constructs were maintained in vitro for one month.
• Cell proliferation, vimentin expression, and extracellular matrix (collagen, glycosaminoglycan) production were analyzed.

Main Results:

• Fibrin gel significantly enhanced cellular proliferation and vimentin expression.
• Increased production of collagen and glycosaminoglycan was observed in the presence of fibrin gel.
• Fibrin gel improved cell and tissue material orientation within the PCL substrates, enhancing construct structure and mechanical properties.

Conclusions:

• Fibrin gel serves as an effective cell carrier for enhancing cell growth and extracellular matrix deposition in tissue-engineered heart valve constructs.
• The combination of fibrin gel and trilayer PCL substrates promotes native-like cell organization and tissue development.
• This strategy holds significant promise for the development of functional tissue-engineered heart valve leaflets.