|Stabilizing to disruptive transition of focal adhesion response to mechanical forces|
|Kong D(孔冬); Ji BH(季葆华); Dai LH(戴兰宏)
|Source Publication||Journal of Biomechanics
|Abstract||Strong mechanical forces can, obviously, disrupt cell-cell and cell-matrix adhesions, e.g., cyclic uniaxial stretch induces instability of cell adhesion, which then causes the reorientation of cells away from the stretching direction. However, recent experiments also demonstrated the existence of force dependent adhesion growth (rather than dissociation). To provide a quantitative explanation for the two seemingly contradictory phenomena, a microscopic model that includes both integrin-integrin interaction and integrin-ligand interaction is developed at molecular level by treating the focal adhesion as an adhesion cluster. The integrin clustering dynamics and integrin-ligand binding dynamics are then simulated within one unified theoretical frame with Monte Carlo simulation. We find that the focal adhesion will grow when the traction force is higher than a relative small threshold value, and the growth is dominated by the reduction of local chemical potential energy by the traction force. In contrast, the focal adhesion will rupture when the traction force exceeds a second threshold value, and the rupture is dominated by the breaking of integrin-ligand bonds. Consistent with the experiments, these results suggest a force map for various responses of cell adhesion to different scales of mechanical force.
Cell Reorientationintegrin–ligand Bonds
|WOS Keyword||COUPLED CHEMICAL-REACTIONS
; ORIENTATION RESPONSE
; INTEGRIN LIGANDS
|WOS Research Area||Biophysics
; Engineering, Biomedical
|Corresponding Author||Dai LH(戴兰宏)|
Kong D,Ji BH,Dai LH. Stabilizing to disruptive transition of focal adhesion response to mechanical forces[J]. Journal of Biomechanics,2010,43(13):2524-2529.
孔冬,季葆华,&戴兰宏.(2010).Stabilizing to disruptive transition of focal adhesion response to mechanical forces.Journal of Biomechanics,43(13),2524-2529.
孔冬,et al."Stabilizing to disruptive transition of focal adhesion response to mechanical forces".Journal of Biomechanics 43.13(2010):2524-2529.