ABSTRACT
Objective To explore the effect of adenosine preconditioning on vascular endothelial growth factor(VEGF)and angiopoietin-1 (Ang-1) in oxygen-glucose deprivation and reoxygenation astrocytes.Methods Astrocytes of pallium in Sprague Dawley rats were cultured in vitro,and the third generation of astrocytes were passaged to 96 pore plate.The astrocytes were divided into normal control group,oxygen-glucose deprivation group and adenosine preconditioning group randomly when the astrocytes adhered to the wall and grew the evection.The cells in the normal control group did not received oxygen glucose deprivation;the cells in the oxygen-glucose deprivation group received oxygen-glucose deprivation 8 h and reoxygenation 24 h;the cells in the adenosine preconditioning group were given adenosine 100 μmol · L-1 at 24 hours before received oxygen-glucose deprivation 8 h and reoxygenation 24 h.The shape of astrocytes were observed after reoxygenation 24 h.The cytoactivity of astrocytes in each group was detected by methyl thiazolyl tetrazolium assay;the concentration of VEGF and Ang-1 in supernatant of astrocytes in each group was detected by enzyme linked immunosorbent assay.Results The astrocytes in the normal control group grew well.The edema of astrocytes in the oxygen-glucose deprivation group was obvious,and the cell body became round;the cell morphology changed from irregular to spindle shape;and the neurites became shorter or even disappeared.Compared with the oxygen-glucose deprivation group,the astrocytes in the adenosine preconditioning group had a mildly edema,and the cells were arranged orderly.The vitality of astrocytes in the normal control group,oxygen-glucose deprivation group and adenosine preconditioning group was 0.698 ± 0.059,0.196 ± 0.062,0.412 ± 0.009 respectively;the vitality of astrocytes in the oxygen-glucose deprivation group was obviously lower than that in the normal control group(q =3.561,P ＜0.05);the vitality of astrocytes in the adenosine preconditioning group was obviously higher than that in the oxygen-glucose deprivation group (q =2.102,P ＜ 0.05).The concentration of VEGF in supemate in the normal control group,oxygen-glucose deprivation group and adenosine preconditioning group was (0.038 ± 0.005),(0.053 ± 0.007),(0.084 ± 0.006) μg · L-1 respectively;the concentration of Ang-1 in supemate in the normal control group,oxygen-glucose deprivation group and adenosine preconditioning group was (0.030 ± 0.007),(0.049 ± 0.008),(0.080 ± 0.004) μg · L-1 respectively.The concentration of VEGF and Ang-1 in the oxygen-glucose deprivation group were obviously higher than those in the normal control group(q =1.394,1.633;P ＜ 0.05);the concentration of VEGF and Ang-1 in the adenosine preconditioning group were obviously higher than those in the oxygen-glucose deprivation group (q =1.584,1.632;P ＜ 0.05).Conclusion The adenosine preconditioning can increase the expression of VEGF and Ang-1 in astrocytes after oxygen-glucose deprivation.It can enhance the tolerance of brain to ischemia-reperfusion injury and produce neural protection effect.