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CD34+ cell selection: focus on immunomagnetic beads and chymopapain
F Silvestri1, S Banavali, C Savignano
1Department of Medical and Morphological Researches, Udine University School of Medicine, Italy.
The International Journal of Artificial Organs
|December 1, 1993
Summary
Immunomagnetic beads offer superior purification of CD34+ cells from peripheral blood and bone marrow compared to panning. This method effectively isolates progenitor cells for research and potential clinical use.
Area of Science:
- Hematology
- Immunology
- Cell Biology
Background:
- Accurate isolation of CD34+ cells is crucial for stem cell transplantation and research.
- Existing methods for CD34+ cell isolation have limitations in efficiency and purity.
Purpose of the Study:
- To develop and compare immunoadsorption techniques for purifying CD34+ cells from peripheral blood (PB) and bone marrow (BM).
- To evaluate the efficacy of immunomagnetic beads versus panning for CD34+ cell isolation.
Main Methods:
- Comparison of immunomagnetic bead separation and panning for CD34+ cell isolation using My10 antibody.
- Density gradient centrifugation and antibody incubation were employed prior to cell separation.
- Chymopapain was used to detach immunomagnetic beads from purified cells.
Main Results:
- Immunomagnetic beads yielded significantly higher CD34+ cell purity (85.5% +/- 11.1%) compared to panning (55.7% +/- 23.8%).
- Immunomagnetic beads also demonstrated superior depletion of CD34+ cells from negative fractions (3.9% +/- 7.6% vs 30.9% +/- 25.1%).
- Chymopapain treatment to detach beads did not harm clonogenic cells, preserving their viability.
Conclusions:
- Positive selection using immunomagnetic beads is an effective method for isolating highly pure CD34+ progenitor cells from PB and BM.
- This technique is suitable for experimental applications and is being explored for clinical use.