Comparative flow cytometry immunophenotyping of ASCs expanded in conventional flasks versus automated bioreactors.

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

• Level A · Stronger Clinical Evidence
• Level B · Emerging clinical evidence with positive signals
• Level C · Early human research exploring benefits
• Level D · Scientific groundwork from lab and animal studies
• Emerging · Emerging topic under active research

Abstract (original English)

Introduction Adipose-derived stem cells (ASCs) hold significant promises for various regenerative approaches, necessitating the production of a substantial quantity of in vitro expanded ASCs for clinical applications. While ASC expansion is traditionally performed in tissue culture polystyrene (TCP) flasks, the Quantum Cell Expansion System, a hollow fiber bioreactor (HFB), offers an automated and closed system for cell expansion, presenting advantages over manual culture methods. In this study, we compared ASC cultures from a HFB system with traditional TCP flasks, focusing on immunophenotypes. Methods ASCs from three donors were cultured and underwent equivalent population doublings in both systems. The cell number was counted to compare the growth rate. Furthermore, the individual expressions of 15 surface markers and their co-expression of 5 (CD73, CD90, CD105, CD166, and CD201) and 8 epitopes (CD34, CD36, CD146, CD248, CD271, CD274, and Stro-1) were analyzed by using multicolor flow cytometry. Results ASCs expanded in the HFB and TCP system showed a comparable growth rate. Except for a significant downregulation of CD201 in HFB ( p = 0.008), other surface marker expression profiles were largely comparable between HFB and TCP, with no statistically significant differences observed. While both systems met ISCT criteria for ASC identity, the HFB supported a broader diversity

Evidence level

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

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