RESUMEN
BACKGROUND:Recent research has shown that the proper concentration of aspirin can increase the proliferation and osteogenic ability of MG-63 cells.OBJECTIVE:To explore the effects of different concentrations of aspirin on osteoblast proliferation on the implant-cell interface under fluid shear stress.METHODS:(1) MG-63 cells were cultured in low-glucose DMEM containing 10％ fetal bovine serum and different concentrations of aspirin (0,0.023,0.046,0.0625,0.125,0.25,0.5,1.0,2.0,4.0 mmol/L) for 1-7 days.Then cell proliferation was detected using MTS method.(2) MG-63 cells were cultured on three different surfaces:glass slide,PT titanium surface and SLA titanium surface.After 3 days of culture with aspirin at a concentration of 0 or 0.5 mmol/L,the cells were subjected to fluid shear stress.MTS test was applied to estimate the proliferation of MG-63 cells at 0,0.5,1,2,4 hours after stress application.RESULTS AND CONCLUSION:(1) After 1-3 days of culture,0.023,0.046,0.5 mmol/L aspirin promoted the proliferation of MG-63 cells,while after 1-7 days of culture,1,2,4 mmol/L aspirin inhibited the proliferation of MG-63 cells.(2) Under the fluid shear stress,aspirin showed significant effects on the cell proliferation as confirmed by one-way analysis of variance (F=8.349,P=0.004),and 0.5 mmol/L aspirin inhibited the cellular proliferation of MG-63 cells.However,surface modification and stress loading time showed no significant effects on the cell proliferation (F=2.826,P=0.064;F=0.893,P=0.406).(3) Under the fluid shear stress,surface modification showed no significant effect on the cell proliferation of MG-63 cells cultured with 0.5 mmol/L aspirin (F=1.803,P=-0.171).Under the fluid shear stress,0.5 mmol/L aspirin significantly inhibited the proliferation of MG-63 cells on the glass slide (P=-0.003),while PT and SLA titanium surfaces showed on inhibitory effect on the cell proliferation (P=0.891,P=0.051).The present results demonstrate that the cell proliferation of MG-63 is related with aspirin in a concentration-dependent manner.In addition,different titanium surfaces may decrease the sensitivity of MG-63 cell proliferation to aspirin.