RESUMO
Although the mechanism by which migratory trophoblasts reach the spiral arteries is currently obscure, yet the process has been noted to involve the attachment, adhesion and migration of trophoblasts on the blood vessel walls. To test this, micropipette and flow chamber were used to measure quantitatively the adhesion forces and migration of early gestation human trophoblast cells (TCs) cultured on the glass slides coated with type I rat collagen or cultured with human umbilical vein endothelial cells (HUVECs). The results showed that the interdiction of integrin beta1 interaction remarkably reduced the adhesion forces of TCs to type I rat collagen or endothelial cells, and remarkably resisted the displacement of TCs induced by shear stress. By contact between TCs and endothelial cells, the TCs' adhesion force and TCs' resistance to shear stress were significantly enhanced. The results indicated that the contacts of TCs with endothelial cells enhanced the adhesion forces of human TCs, and regulated the migration of human TCs by shear stress.