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Sperm Collection of Differential Quality Using Density Gradient Centrifugation
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Low-stress Microfluidic Density-gradient Centrifugation for Blood Cell Sorting.

Yuxi Sun1,2, Palaniappan Sethu3,4

  • 1Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, 1918 University Blvd, MCLM 290A, Birmingham, AL, 35294, USA.

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|August 30, 2018
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Summary

This study presents a microfluidic device for rapid, low-stress isolation of peripheral blood mononuclear cells (PBMCs). The automated system minimizes cell activation compared to traditional methods, offering a promising alternative for point-of-care applications.

Keywords:
Cell separationsCell sortingDensity gradient centrifugationLeukocyte activationMicrofluidic cell sorting

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Microfluidics

Background:

  • Conventional density gradient centrifugation isolates peripheral blood mononuclear cells (PBMCs) but is time-consuming, labor-intensive, and can cause cell activation due to high centrifugal forces.
  • Label-free isolation methods are preferred to avoid harsh lysis buffers, but existing techniques have limitations.

Purpose of the Study:

  • To develop a miniaturized and automated microfluidic system for continuous, low-stress isolation of PBMCs from whole blood.
  • To provide an alternative to conventional density gradient centrifugation that minimizes cell activation and preserves cell subpopulations.

Main Methods:

  • Established a microfluidic density gradient by exploiting laminar flow to layer blood over Ficoll.
  • Developed a continuous flow-through system for automated PBMC isolation.
  • Evaluated the purity and activation status of isolated PBMCs.

Main Results:

  • Successfully isolated PBMCs from whole blood using the microfluidic device.
  • Preserved monocyte and lymphocyte subpopulations comparable to conventional density gradient centrifugation.
  • Demonstrated minimal isolation-induced cell activation compared to lysis or conventional density gradient centrifugation.

Conclusions:

  • The automated microfluidic density gradient centrifugation technique offers a rapid, activation-free method for PBMC isolation.
  • This approach minimizes stress on blood cells, preserving their integrity and function.
  • The technology holds potential for point-of-care applications requiring high-quality PBMC isolation.