Scalable Manufacturing of Human Hematopoietic Stem/Progenitor Cells Exploiting a Co-culture Platform with Mesenchymal Stromal Cells.

In the context of hematopoietic cell transplantation, hematopoietic stem/progenitor cells (HSPC) from the umbilical cord blood (UCB) present several advantages compared to adult sources including higher proliferative capacity, abundant availability and ease of collection, non-risk and painless harvesting procedure, and lower risk of graft-versus-host disease. However, the therapeutic utility of UCB HSPC has been limited to pediatric patients due to the low cell frequency per unit of UCB. The development of efficient and cost-effective strategies to generate large numbers of functional UCB HSPC ex vivo would boost all current and future medical uses of these cells. Herein, we describe a scalable serum-free co-culture system for the expansion of UCB-derived CD34+-enriched cells using microcarrier-immobilized human bone marrow-derived mesenchymal stromal cells as feeder cells.