Oxygen-Releasing Microparticles for Cell Survival and Differentiation Ability under Hypoxia for Effective Bone Regeneration.

Sufficient oxygen delivery into tissue-engineered three-dimensional (3D) scaffolds to produce clinically applicable tissues/organs remains a challenge for researchers and clinicians. One potential strategy to overcome this limitation is the use of an oxygen releasing scaffold. In the present study, we prepared hollow microparticles (HPs) loaded with an emulsion of the oxygen carrier perfluorooctane (PFO; PFO-HPs) for the timely supply of oxygen to surrounding cells. These PFO-HPs prolonged the survival and preserved the osteogenic differentiation potency of human periosteal-derived cells ( hPDCs) under hypoxia. hPDCs seeded onto PFO-HPs formed new bone at a faster rate and with a higher bone density than hPDCs seeded onto phosphate buffered saline-loaded control HPs. These findings suggest that PFO-HPs provide a suitable environment for the survival and maintenance of differentiation ability of hPDCs at bony defects without vascular networks until new blood vessel ingrowth occurs, thus enhancing bone regeneration. PFO-HPs are a promising system for effective delivery of various functional cells, including stem cells and progenitor cells, to regenerate damaged tissues/organs.