Characterization of a multilayer heparin coating for biomolecule presentation to human mesenchymal stem cell spheroids

Abstract

Mesenchymal stem cell (MSC) therapies have the potential to treat many pathologies, however, controlling cell fate after implantation remains challenging. We have used a multilayer technology to graft a range of 5 μg mL⁻¹–5 mg mL⁻¹ heparin onto the surface of MSC aggregates. Heparin coating does not affect cell viability (seen through LIVE/DEAD staining) and cell anti-inflammatory properties (seen through co-culture with activated monocytes) and facilitates sequestration by coated cells of a growth factor (TGF-β1) that remains bioactive. This system can maximize the therapeutic potential of MSC-based treatments because the cell surface-loaded protein could both signal the cells to influence transplanted cell fate and be released into the surrounding environment to help repair injured tissue.