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Published on: February 7, 2018
Dynamic PEGDA-GelMA-HAMA microcarriers for efficient ex vivo expansion of human hematopoietic stem/progenitor cells
Yiming Liu1, Meishan Guo2, Lulu Shi3
1Beijing Institute of Radiation Medicine, Beijing 100850, China.
The clinical demand for hematopoietic stem cells (HSCs) far exceeds that of the available sources, driving the need for efficient ex vivo expansion technologies. A central challenge is the design of culture systems that promote HSCs proliferation while inhibiting differentiation, a balance that is poorly maintained in conventional static cultures. In this study, we engineered a novel biomimetic microcarrier (denoted as P7G3H2) by synthesizing a composite hydrogel from poly(ethylene glycol) diacrylate (PEGDA), gelatin methacryloyl (GelMA), and hyaluronic acid methacryloyl (HAMA). This material combination was designed to mimic the key aspects of the bone marrow niche, providing mechanical tunability (PEGDA), cell-adhesive motifs (GelMA), and bioactive signaling engagement (HAMA). We established a P7G3H2 microcarrier-based dynamic culture system to expand human umbilical cord blood-derived hematopoietic stem/progenitor cells (HSPCs). The new system yielded 3.76 times more total CD34+CD38- cells than the control group and enhanced the proportion of primitive cells by approximately 74% compared to controls after 7 days of expansion. The expanded cells preserved intrinsic multipotency and multi-lineage differentiation potential, while demonstrating a marked propensity for spontaneous erythroid differentiation during prolonged culture. This study demonstrates that a rationally designed biomaterial platform within a dynamic culture environment can significantly improve the efficiency and quality of HSPCs expansion, offering a promising strategy for scalable HSCs production.
The clinical demand for hematopoietic stem cells (HSCs) far exceeds that of the available sources, driving the need for efficient ex vivo expansion technologies. A central challenge is the design of culture systems that promote HSCs proliferation while inhibiting differentiation, a balance that is poorly maintained in conventional static cultures. In this study, we engineered a novel biomimetic microcarrier (denoted as P7G3H2) by synthesizing a composite hydrogel from poly(ethylene glycol) diacrylate (PEGDA), gelatin methacryloyl (GelMA), and hyaluronic acid methacryloyl (HAMA). This material combination was designed to mimic the key aspects of the bone marrow niche, providing mechanical tunability (PEGDA), cell-adhesive motifs (GelMA), and bioactive signaling engagement (HAMA). We established a P7G3H2 microcarrier-based dynamic culture system to expand human umbilical cord blood-derived hematopoietic stem/progenitor cells (HSPCs). The new system yielded 3.76 times more total CD34+CD38- cells than the control group and enhanced the proportion of primitive cells by approximately 74% compared to controls after 7 days of expansion. The expanded cells preserved intrinsic multipotency and multi-lineage differentiation potential, while demonstrating a marked propensity for spontaneous erythroid differentiation during prolonged culture. This study demonstrates that a rationally designed biomaterial platform within a dynamic culture environment can significantly improve the efficiency and quality of HSPCs expansion, offering a promising strategy for scalable HSCs production.
