The purpose of this study is to investigate the effects of intermittent hydrostatic pressure with various resting periods on the cell adhesive forces and other parameters related to spreading in early stage of cell adhesion. For this, bovine pulmonary arterial endothelium (CPAE, cell line), porcine articular chondrocytes, and human endothelial cells (HECs) were used. The cells were divided into six different experimental groups. Control group was cultured without stimulation, while the constant pressure was applied to group 1 for 2 h. Groups 2-5 were intermittently pressurized for 2 min at a time over a 2-h period with 5, 10, 15, and 20-min resting periods, respectively. Each group was then split into two subgroups, depending whether it experienced extra 60 min stabilization period after stimulation. The average adhesive force and the number and area of focal contacts were significantly higher in the group 4 subgroup, which received an extra 60 min of culture than in the other groups. Similarly, other parameters in this subgroup were significantly different from those in the other groups. The focal contact area and adhesive force were closely related (r = 0.990). We concluded that the mechanical stimuli affect cell adhesion and that the length of the resting period influences the adhesive forces generated at the early stages of adhesion.
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