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Updated: Mar 12, 2026
Designing Microfluidic Devices for Studying Cellular Responses Under Single or Coexisting Chemical/Electrical/Shear Stress Stimuli
Published on: August 13, 2016
Improved cell adhesion under shear stress in PDMS microfluidic devices.
Asma Siddique1, Tobias Meckel2, Robert W Stark1
1Physics of Surfaces, Institute of Materials Science, Technische Universität Darmstadt, Alarich-Weiss-Str. 16, 64287, Darmstadt, Germany; Center of Smart Interfaces, Technische Universität Darmstadt, Alarich-Weiss-Str. 10, 64287, Darmstadt, Germany.
Researchers improved long-term cell studies in microfluidic devices by using (3-Aminopropyl)triethoxysilane (APTES) to anchor collagen to polydimethylsiloxane (PDMS). This enhanced cell stability and proliferation under shear flow.
Area of Science:
- Biomedical Engineering
- Cell Biology
- Materials Science
Background:
- Polydimethylsiloxane (PDMS) microfluidic systems are valuable for studying cell mechanoresponse.
- Physically adsorbed proteins on PDMS offer limited stability for long-term cell studies under shear flow.
Purpose of the Study:
- To enhance the stability and proliferation of fibroblast cells in PDMS microfluidic devices under shear flow.
- To investigate the use of (3-Aminopropyl)triethoxysilane (APTES) as a linker for improved collagen adhesion to PDMS surfaces.
Main Methods:
- Modification of PDMS micro-channels using APTES to anchor collagen.
- Comparison of cell adhesion and proliferation on APTES-anchored collagen versus physically adsorbed collagen under varying shear stresses.
- Assessment of long-term cell growth (48 hours) under different shear stress levels.
Main Results:
- APTES-anchored collagen significantly improved fibroblast cell stability and proliferation compared to physically adsorbed collagen.
- Cells in APTES-modified devices showed better adhesion and proliferation at shear stresses between 11.6 and 93 dyn/cm².
- Cellular detachment occurred at a lower shear stress of 23 dyn/cm² in devices with adsorbed collagen.
- APTES-anchored collagen supported improved long-term cell growth (48h) across shear stress levels of 10-300 dyn/cm².
Conclusions:
- APTES is a promising linker for covalently attaching collagen to PDMS surfaces in microfluidic devices.
- This technique enhances cellular stability and proliferation, enabling more robust long-term mechanotransduction studies.
- APTES-mediated collagen attachment is a valuable method for modifying both glass and PDMS surfaces in microfluidic applications.
