Quantification of cell adhesion using a spinning disc device and application to surface-reactive materials.

Quantitative analysis of cell adhesion is essential in understanding physiological phenomena and developing biotechnological applications. Electrochemical measurements demonstrated that the transport patterns associated with a spinning disc device approximate the fluid flow and mass transport fields for a disc spinning in an infinite fluid. Therefore, this device applies a linear range of forces to attached cells under uniform and constant chemical conditions at the interface. The application of this apparatus for examining cell adhesion to surface-active materials was illustrated by investigating the attachment of osteoblast-like cells to fibronectin adsorbed onto bioactive and non-reactive glasses for different chemical environments. Cells were seeded on fibronectin-coated substrates for 15 min and then subjected to detachment forces for 10 min. The number of adherent cells decreased non-linearly with applied force and the detachment profile was accurately described by a sigmoidal curve fit, as expected for a cell population with normally distributed adhesion properties.

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