A Microbore Tubing Based Spiral for Multistep Cell Fractionation

Area of Science:

• Biotechnology
• Cell Biology
• Microfluidics

Background:

• Cell separation is crucial for biological research and clinical diagnostics.
• Existing methods can be expensive, time-consuming, or lead to cell damage.
• There is a need for efficient, cost-effective, and gentle cell fractionation techniques.

Purpose of the Study:

• To develop and validate a multistep spiral fractionation device for cell separation.
• To demonstrate the device's effectiveness using model beads and cancer cells.
• To assess the purity and viability of separated cells.

Main Methods:

• Fabrication of a spiral fractionation device using "off-the-shelf" microbore tubing.
• Utilizing hydrodynamic forces within the spiral tubing for cell separation.
• Testing the device with 20 and 40 μm beads and doxorubicin-resistant/sensitive breast cancer cells (MDA-MB-231).
• Employing polyethylene glycol (PEG)-8000 to enhance separation efficiency.

Main Results:

• Achieved 83% purity for 20 and 40 μm beads from an initial 5% purity after a two-step separation with PEG-8000.
• Successfully separated doxorubicin-resistant polyploid giant breast cancer cells from sensitive monoploid cells with approximately 40% purity.
• Maintained over 90% cell viability during the separation process.

Conclusions:

• The multistep spiral fractionation device offers a cheap and fast prototyping method for cell separation.
• The hydrodynamic separation principle is effective for fractionating different cell types.
• This technology holds potential for various cell biology research and clinical applications.