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Cell separation mediated by differential rolling adhesion.

A W Greenberg1, D A Hammer

  • 1Department of Bioengineering and Institute for Medicine and Engineering, University of Pennsylvania, 3320 Smith Walk, Philadelphia, Pennsylvania 19104, USA.

Biotechnology and Bioengineering
|March 20, 2001
PubMed
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This study demonstrates a novel method for separating cells based on their rolling adhesion properties. This technique can effectively enrich hematopoietic stem and progenitor cells from bone marrow, offering advantages over current methods.

Area of Science:

  • Biotechnology
  • Cell Biology
  • Biophysics

Background:

  • Hematopoietic stem and progenitor cells (HSPCs) exhibit varying rolling efficiencies on selectins, correlating with developmental maturity.
  • Existing cell separation methods, such as antibody-mediated affinity chromatography, have limitations.

Purpose of the Study:

  • To develop and validate a novel cell separation technique exploiting differential selectin-mediated rolling adhesion.
  • To assess the feasibility of this method for enriching HSPCs from adult bone marrow.

Main Methods:

  • Utilized a cell-free system with sialyl Lewis x (sLe(x))-coated microspheres rolling on L-selectin substrates under controlled flow conditions.
  • Measured rolling velocities and flux of microsphere and cell populations.
  • Applied rolling velocity and flux data to predict separation efficiency for CD34+ and CD34- adult bone marrow cells.

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Main Results:

  • Demonstrated successful separation of microsphere populations based on differential average rolling velocities.
  • Achieved excellent recovery and purity for slower-rolling (more desirable) populations.
  • Showed feasibility for selectin-mediated separation of adult bone marrow cells, with potential for HSPC enrichment.

Conclusions:

  • Differential rolling adhesion is a viable principle for cell separation.
  • This selectin-mediated method offers a promising alternative for enriching HSPCs from adult bone marrow, with advantages over current technologies.