Spatial optimization in perfusion bioreactors improves bone tissue-engineered construct quality attributes.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Bioreactor Technology

Background:

• Perfusion bioreactors offer uniform nutrient and shear stress distribution for tissue engineering.
• Non-uniform flow at the perfusion chamber entrance can negatively impact construct quality.

Purpose of the Study:

• To optimize scaffold location within a perfusion bioreactor using computational fluid dynamics (CFD).
• To investigate the effect of scaffold positioning on bone tissue-engineered construct development.

Main Methods:

• A 3D CFD model of the perfusion bioreactor and scaffold was developed.
• CFD simulations were coupled with bioreactor experiments.
• Scaffold placement was compared at the inlet versus an optimized distance with steady flow.

Main Results:

• Scaffold location significantly influenced cell content and neo-tissue distribution at 14 and 21 days.
• Contrast-enhanced nanoCT quantified differences in construct quality based on scaffold position.
• Gene expression of osteopontin and osteocalcin remained unaffected by scaffold location.

Conclusions:

• Bioreactor chamber design and scaffold placement critically affect intra-scaffold flow patterns.
• Optimized scaffold positioning is essential for enhancing bone tissue-engineered construct quality.
• This study highlights the need for dedicated optimization of bioreactor environments for improved tissue engineering outcomes.