Humanized large-scale expanded endothelial colony-forming cells function in vitro and in vivo

Area of Science:

• Cell Biology
• Regenerative Medicine
• Vascular Biology

Background:

• Endothelial progenitor cells (EPCs) are crucial for vascular homeostasis, regeneration, and tumor angiogenesis.
• Endothelial colony-forming cells (ECFCs), a subset of EPCs, possess significant proliferative capacity and vessel-forming potential.
• Current methods for isolating and expanding ECFCs are inefficient and lack safety for clinical applications.

Purpose of the Study:

• To develop an efficient and safe large-scale method for isolating and expanding human ECFCs.
• To establish an animal protein-free, humanized expansion strategy for ECFCs.
• To assess the progenitor hierarchy, proliferation potential, and functional capacity of expanded ECFCs.

Main Methods:

• Human ECFCs were recovered directly from unmanipulated whole blood.
• A novel large-scale, animal protein-free, humanized expansion strategy was employed.
• The phenotype, function, proliferation potential (over 30 population doublings), and genomic stability of expanded ECFCs were analyzed post-expansion and cryopreservation.

Main Results:

• The novel strategy enabled direct recovery and large-scale propagation of human ECFCs from whole blood.
• The expansion method preserved the progenitor hierarchy and sustained high proliferation potential.
• Expanded ECFCs demonstrated robust vascular network formation in vitro and perfused vessels in vivo.
• Phenotype, function, proliferation, and genomic stability were maintained after large-scale expansion and cryopreservation.

Conclusions:

• A scalable, animal protein-free, humanized expansion method for ECFCs has been established.
• This method yields proliferative, functional, and cryopreservable ECFCs.
• These ECFCs are suitable for further investigation into their therapeutic potential and safety profile.