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Determining cell seeding dosages for tissue engineering human pulmonary valves.

Benjamin S Frank¹, Peter B Toth, Whitney K Wells

¹Weill Cornell Medical College, New York, New York, USA.

The Journal of Surgical Research

|February 25, 2011

Summary

This summary is machine-generated.

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Tissue engineering of heart valves using decellularized human pulmonary valves (hPVs) and human valve interstitial cells (hVICs) shows promise. Static seeding promotes cell proliferation, while bioreactor culture enhances cell migration into the scaffold matrix.

Area of Science:

Biomaterials Science
Regenerative Medicine
Cardiovascular Engineering

Background:

Development of functional tissue-engineered heart valves is crucial for treating valvular heart disease.
Decellularized human pulmonary valves (hPVs) offer a promising scaffold material.
Human valve interstitial cells (hVICs) are key cellular components for valve tissue regeneration.

Purpose of the Study:

To establish and validate an in vitro assay for seeding decellularized hPVs with hVICs.
To evaluate the efficiency of cell seeding, proliferation, and migration under different culture conditions.
To determine optimal seeding parameters for hPV tissue engineering.

Main Methods:

Decellularization of hPVs using a multi-step protocol.

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Seeding of decellularized scaffolds with hVICs at varying densities.

Incubation of seeded scaffolds in static or cyclic pressure bioreactors.

Quantification of cell viability (MTT assay) and localization (histology).

Main Results:

Static seeding achieved higher cell attachment and proliferation compared to bioreactor culture.
Bioreactor culture, however, resulted in significantly greater subsurface cell migration into the scaffold matrix.
A medium seeding density of 2.5 × 10(5) cells was found to be optimal.

Conclusions:

A trade-off exists between static seeding (higher cell numbers) and bioreactor culture (enhanced cell infiltration).
The identified optimal seeding dose is feasible for heart valve tissue engineering.
Traditional cell amplification methods can achieve the necessary cell densities for this approach.