Cell adhesion monitoring using a quartz crystal microbalance: comparative analysis of different mammalian cell lines

Abstract The quartz crystal microbalance (QCM) has been widely accepted as a sensitive technique to follow adsorption processes in gas as well as in liquid environments. However, there are only a few reports about the use of this technique to monitor the attachment and spreading of mammalian cells onto a solid support in culture. Using a QCM-setup we investigated the time course of cell attachment and spreading as a function of seeding density for three widespread and frequently used cell lines (MDCK strains I and II and Swiss 3T3-fibroblasts). Results were found to be in good agreement with the geometrical properties of the individual cell types. The shifts of the resonance frequency associated with confluent cell layers on top of the quartz resonators were found to be dependent on the cell species [MDCK-I: (320±20) Hz; MDCK-II: (530±25) Hz; 3T3: (240±15) Hz] reflecting their individual influence on the shear oscillation of the resonator. These findings are discussed with respect to the basic models of materials in contact with an oscillating quartz resonator. We furthermore showed by inhibition-assays using soluble RGD-related peptides, that only specific, integrin mediated cell adhesion is detected using this QCM approach, whereas the sole presence of the cellular body in close vicinity to the resonator surface is barely detectable.

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