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Multicentre European study comparing selection techniques for the isolation of CD34+ cells
E A de Wynter1, D Ryder, F Lanza
1Paterson Institute for Cancer Research, Withington, Manchester, UK.
Bone Marrow Transplantation
|June 26, 1999
Summary
Isolating primitive haemopoietic stem cells (HSCs) is crucial for research. This study compared four methods for CD34+ cell selection, finding significant variations in purity and colony-forming cell enrichment among techniques.
Area of Science:
- Hematology
- Cell Biology
- Biotechnology
Background:
- Primitive haemopoietic cells are essential for clinical and research applications.
- Various systems exist for isolating these critical haemopoietic cell populations.
Purpose of the Study:
- To analyze and compare the performance of four distinct CD34+ cell positive selection techniques.
- To assess purity, yield, and colony-forming cell (CFC) enrichment across different isolation methods.
Main Methods:
- Analysis of results from 110 samples across multiple European centers.
- Evaluation of four selection techniques: immunoaffinity columns (Ceprate LC), immunomagnetic beads (Dynabeads, Baxter Isolex 50), and submicroscopic magnetic beads (MACS).
- Assessment of CD34+ cell purity, yield, and CFC enrichment.
Main Results:
- Mean purities varied by technique, with MACS achieving 68.4-78.4%, Dynabeads 33.9-69.9%, Ceprate LC 46.9-66.8%, and Baxter Isolex 50 43.2-65%.
- Yields were inconsistent across all methods.
- Immunoaffinity columns demonstrated superior CFC enrichment compared to other systems; some techniques required additional expertise.
Conclusions:
- Highly purified CD34+ cells can be isolated from diverse haemopoietic sources using available techniques.
- Significant variations in cell yield and CFC enrichment exist, dependent on the chosen isolation method.
- Not all cell selection methods produce comparable results in terms of purity, cell number, and functional capacity.