摘要:
目的 探讨血塞通( XST)干预治疗SD大鼠全脑缺血/再灌注(I/R)后大脑海马回核因子-κappaB p65( NF-κBp65)的表达,阐明其在全脑I/R损伤后的保护作用.方法 72只健康SD大鼠,随机分为假手术组( SO)24只,全脑I/R组24只,XST治疗组24只.采用简化的Pulsinelli等的四血管阻塞法建立急性全脑I/R损伤及XST对其作用的模型;用HE染色检测海马CA1区存活锥体细胞数目;用TUNEL原位末端标记法检测锥体细胞凋亡率;用免疫组织化学SABC法检测海马CA1区锥体细胞中NF-κB p65的表达.结果 XST组在再灌注后存活锥体细胞数持续增加,且在用药后3、12、24、48 h均明显多于I/R组[(99.23 ±4.22)个/mm vs (75.83±7.17)个/mm,( 80.93±5.36)个/mm vs (51.50 ±8.26)个/mm,(103.24 ±5.48)个/mm vs(35.67±13.17)个/mm,( 126.22±7.54)个/mm vs (9.83 ±4.71)个/mm],差异均有统计学意义(P<0.01);XST组各时间点锥体细胞凋亡率与I/R组比较均明显降低[(8.82±2.71)% vs (22.58±4.68)%,(19.15±6.23)%vs(42.68±3.04)%,(11.82±2.87)% vs(55.51±6.81)%,(8.44±3.23)% vs(71.69±7.71)%],差异均有统计学意义(P<0 01);XST组各时间点NF-κB p65表达阳性的细胞数均明显少于I/R组[(13.20±2.50) vs(18.00±1.87),( 8.20±5.31)vs(41.60±3.65),(6.70±3.36)vs(55.30±5.10),(7.10 ±3.57) vs (72.80±4.71)],差异均有统计学意义(P<0.05,P<0.01).结论 在全脑I/R损伤后,XST可抑制NF-κB p65的表达,抗细胞凋亡,增加存活神经元的数目而起到脑保护作用,从而为XST在脑复苏应用中提供有力的理论依据.%Objective To investigate the expression of NF-κBp65 in hippocampus after the XST intervention therapy in the SD rats with global cerebral I/R injury and testify the protective effect of XST after global cerebral I/R injury.Methods 72 healthy SD rats were randomly divided into 3 groups,sham operation(SO) group ( n =24),I/R group( n =24) and XST group( n =24).The model of acute global cerebral ischemia/reperfusion (including:I/R and XST group) injury was produced by means of simple Pulsinelli- brierley's four arteries occlusion method.H.E.staining was performed to detect the number of surviving neurons and TUNEL was used to detect the rate of neurons apoptosis.The expression activation of NF-κB p65 in hippocampus comu-ammonis ( CA1 ) region were examined by immunohistochemical method (SABC).Results The survival pyramidal neurons in the XST group continued to increase,and it was significantly more than the I/R group at each time-point after reperfusion[ (99.23 ±4.22)/mm vs (75.83 ±7.17 )/mm,(80.93 ± 5.36)/mm vs (51.50 ± 8.26 )/mm,(103.24 ± 5.48 )/mm vs (35.67 ± 13.17 )/mm,( 126.22 ± 7.54 )/mm vs (9.83 ± 4.71 )/mm ],the differences were statistically significant ( P <0.01 ).The apoptosis rate of pyramidal cell in the XST group at each time-point were more significantly reduced than the I/R group [ ( 8.82 ± 2.71 ) % vs ( 22.58 ± 4.68 ) %.( 19.15 ± 6.23 ) % vs (42.68 ± 3.04 ) %,( 11.82 ± 2.87 ) % vs ( 55.51 ± 6.81 ) %,( 8.44 ± 3.23 ) % vs ( 71.69 ± 7.71 ) % ],the differences were statistically significant ( P <0.01 ).The positive neurons of NF-κBp65 expression in the XST group at different time-points were significantly less than the L/R group[ ( 13.20 ±2.50) vs ( 18.00 ± 1.87),(8.20 ±5.31) vs (41.60±3.65),(6.70±3.36) vs (55.30±5.10),(7.10±3.57) vs (72.80 ±4.71)],the differences were statistically significant ( P < 0.05,P < 0.01 ).Conclusions After global cerebral ischemia/reperfusion,XST could protect the brain from global cerebral ischemia/reperfusion injury by holding up the expression of NF- kappaB p65,and inhibiting neuronal apoptosis,and increasing the number of surviving neurons.Thus,the results of this experiment could provide a powerful and weighty objective indication for XST being used during cerebral resuscitation.