title: Microfluidic shear devices for quantitative analysis of cell adhesion.
abstract: We describe the design, construction, and characterization of microfluidic devices for studying cell adhesion and cell mechanics. The method offers multiple advantages over previous approaches, including a wide range of distractive forces, high-throughput performance, simplicity in experimental setup and control, and potential for integration with other microanalytic modules. By manipulating the geometry and surface chemistry of the microdevices, we are able to vary the shear force and the biochemistry during an experiment. The dynamics of cell detachment under different conditions can be captured simultaneously using time-lapse videomicroscopy. We demonstrate assessment of cell adhesion to fibronectin-coated substrates as a function of the shear stress or fibronectin concentration in microchannels. Furthermore, a combined perfusion-shear device is designed to maintain cell viability for long-term culture as well as to introduce exogenous reagents for biochemical studies of cell adhesion regulation. In agreement with established literature, we show that fibroblasts cultured in the combined device reduced their adhesion strength to the substrate in response to epidermal growth factor stimulation.
authors.affiliation: Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Hang
authors.initials: H
authors.lastname: Lu
authors.forename: Lily Y
authors.initials: LY
authors.lastname: Koo
authors.forename: Wechung M
authors.initials: WM
authors.lastname: Wang
authors.forename: Douglas A
authors.initials: DA
authors.lastname: Lauffenburger
authors.forename: Linda G
authors.initials: LG
authors.lastname: Griffith
authors.forename: Klavs F
authors.initials: KF
authors.lastname: Jensen
mesh_terms: D016475:3T3 Cells; D000818:Animals; D002448:Cell Adhesion / Q000187:drug effects; D002470:Cell Survival; D004815:Epidermal Growth Factor / Q000494:pharmacology; D005353:Fibronectins / Q000378:metabolism*; D051379:Mice; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation* / Q000379:methods; D033081:Shear Strength; D013997:Time Factors
chemical_list: D005353:Fibronectins; D004815:Epidermal Growth Factor