Alginate Microspheroid Encapsulation and Delivery of MG 63 Cells Into Polycaprolactone Scaffolds: A New Biofabrication Approach for Tissue Engineering Constructs

Abstract

Scaffolds play an important role in tissue engineering by providing structural framework and a surface for cells to attach, proliferate, and secrete extracellular matrix (ECM). In order to enable efficient tissue formation, delivering sufficient cells into the scaffold threedimensional (3D) matrix using traditional static and dynamic seeding methods continues to be a critical challenge. In this study, we investigate a new cell delivery approach utilizing deposition of hydrogelcell encapsulated microspheroids into polycaprolactone (PCL) scaffolds to improve the seeding efficiency. Threedimensionalbioplotted PCL constructs (0 deg/90 deg lay down, 284 آ±â€‰6 خ¼m strand width, and 555 آ±â€‰8 خ¼m strand separation) inoculated with MG63 model bone cells encapsulated within electrostatically generated calciumalginate microspheroids (أک 405 آ±â€‰13 خ¼m) were evaluated over seven days in static culture. The microspheroids were observed to be uniformly distributed throughout the PCL scaffold cross section. Encapsulated cells remained viable within the constructs over the test interval with the highest proliferation noted at day 4. This study demonstrates the feasibility of the new approach and highlights the role and critical challenges to be addressed to successfully utilize 3Dbioprinting for microencapsulated cell delivery.