Single-platform quality control assay to quantify multipotential stromal cells in bone marrow aspirates prior to bulk manufacture or direct therapeutic use |
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Authors: | Cuthbert Richard Boxall Sally A Tan Hiang Boon Giannoudis Peter V McGonagle Dennis Jones Elena |
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Institution: | Academic Unit of Musculoskeletal Disease, Leeds Institute of Molecular Medicine, University of Leeds, UK. |
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Abstract: | Background aimsThe manufacture of multipotential stromal cell (MSC)-based products is costly; therefore, a rapid evaluation of bone marrow (BM) ‘quality’ with respect to MSC content is desirable. The aim of this study was to develop a rapid single-platform assay to quantify MSC in BM aspirates.MethodsAspirated MSC were enumerated using the CD45?/low CD271bright phenotype and AccuCheck counting beads and compared with a classic colony-forming unit–fibroblast (CFU-F) assay. The phenotype of CD45?/low CD271bright cells was defined using a range of MSC (CD73, CD105, CD90) and non-MSC (CD31, CD33, CD34, CD19) markers. The effect of aspirated BM volume on MSC yield was also determined.ResultsCD45?/low CD271bright cells had a classic MSC phenotype (CD73+ CD105+ CD90+ ). Their numbers correlated positively with CFU-F counted manually (R = 0.81, P < 0.001) or using automatic measurements of surface area occupied by colonies (R = 0.66, P < 0.001). Simultaneous enumeration of CD34 + cells revealed donor variability ranges compatible with standard International Society of Hematotherapy and Graft Engineering (ISHGE) protocols. Aspirating larger marrow volumes gave a significant several-fold reduction in the frequency of CFU-F and CD45?/low CD271bright cells per milliliter. Therefore aspirated MSC yields can be maximized through a standardized, low-volume harvesting technique.ConclusionsAbsolute quantification of CD45?/low CD271bright cells was found to be a reliable method of predicting CFU-F yields in BM aspirates. This rapid (< 40 min) procedure could be suitable for intra-operative quality control of BM aspirates prior to volume reduction/direct injection in orthopedics. In the production of culture-expanded MSC, this assay could be used to exclude samples containing low numbers of MSC, resulting in improved consistency and quality of manufactured MSC batches. |
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