Application of a Parallelizable Perfusion Bioreactor for Physiologic 3D Cell Culture

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Cell Biology

Background:

• Maintaining physiologic conditions in 3D cell scaffold cultures is vital but challenging for optimizing 3D cell culture processes.
• A new miniaturized perfusion bioreactor and incubator system enables high-throughput screening of multiple conditions for 3D cell cultivation.

Purpose of the Study:

• To evaluate a decellularized bone matrix for 3D osteogenic differentiation under flow perfusion.
• To optimize physiologic shear stress and hydrostatic pressure conditions for human mesenchymal stem cell (MSC) osteogenic differentiation.

Main Methods:

• Utilized a miniaturized perfusion bioreactor and specialized incubator for high-throughput screening.
• Employed X-ray computed microtomography and scanning electron microscopy (SEM) for matrix analysis.
• Assessed osteogenic differentiation via alkaline phosphatase activity and SEM imaging.

Main Results:

• A closed cell layer covered the decellularized bone matrix under dynamic conditions.
• Osteogenic differentiation of MSCs increased under all dynamic conditions compared to static controls.
• Optimal fluid shear stress (FSS) was determined to be 1.5 mL/min (approximately 10 mPa).
• Hydrostatic pressure (HP) did not show a distinct additional effect on osteogenic differentiation beyond flow perfusion.

Conclusions:

• The bioreactor system effectively facilitates biomaterial testing and optimization of 3D cell culture processes.
• Physiologic conditions, particularly FSS, are crucial for enhancing MSC osteogenic differentiation.
• The developed bioreactor/incubator system is versatile and offers high throughput, promising advancements in various 3D cell culture applications.