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T cell activation on a single-cell level in dielectrophoresis-based microfluidic devices
Michael Kirschbaum1, Magnus Sebastian Jaeger, Tim Schenkel
1Fraunhofer Institute for Biomedical Engineering (IBMT), Lab-On-Chip Technologies, Am Muehlenberg 13, 14476 Potsdam, Germany.
Journal of Chromatography. A
|July 16, 2008
Summary
This study details a novel lab-on-chip method for activating single T cells using dielectrophoresis. The technique gently guides cells to microbeads, achieving high activation rates with minimal stress, paving the way for cell therapies.
Area of Science:
- Biotechnology
- Cell Biology
- Microfluidics
Background:
- In vitro processing of live cells is critical for therapeutic applications.
- Precise control over cell-cell interactions is needed for reliable T cell activation.
Purpose of the Study:
- To present a protocol for activating single T cells using microbeads in a lab-on-chip environment.
- To investigate the efficacy and physiological impact of dielectrophoretic manipulation for cell activation.
Main Methods:
- Utilized microfluidic chips with microelectrodes for dielectrophoretic manipulation of cell-bead pairs.
- Employed anti-CD3/anti-CD28 coated microbeads for T cell activation.
- Assessed T cell activation via CD69 expression after overnight cultivation.
Main Results:
- Achieved assembly of T cells and microbeads using dielectrophoretic guiding elements.
- Observed 77% of bead-associated T cells expressing the activation marker CD69.
- Determined that physiological stress primarily resulted from single-cell cultivation, not chip manipulation.
Conclusions:
- The developed lab-on-chip protocol enables gentle and controlled in vitro T cell activation.
- Dielectrophoretic manipulation minimizes non-specific cell contacts, enhancing activation efficiency.
- This approach holds potential for therapeutic cell processing and stem cell differentiation regulation.
