丹参酮ⅡA对脑缺血再灌注损伤大鼠P-选择素和细胞间黏附分子-1表达的影响

目的探讨丹参酮ⅡA（TanⅡA）对脑缺血再灌注损伤大鼠P-选择素和细胞间黏附分子-1（ICAM-1）表达的影响。方法将大鼠随机分为假手术组、缺血再灌注组、TanⅡA低剂量治疗组和TanⅡA高剂量治疗组，线栓法建立局灶性脑缺血再灌注模型。TanⅡA治疗组于术前连续灌胃给药3d，1次／d。用免疫组化法观察缺血90min再灌注24h大鼠额顶部皮质P-选择素和ICAM-1表达，进行2，3，5-三苯基氯化四氮唑（TTC）染色和HE染色观察脑梗死体积及病理形态学变化。结果脑缺血再灌注24h，缺血再灌注组P-选择素和ICAM-1表达均明显增加，与假手术组比较，差异具有统计学意义（均P〈0．01）；与缺血再灌注组比较，TanⅡA低、高剂量治疗组均显著减少P-选择素和ICAM-1表达（均P〈0．01），低、高剂量组之间差异亦具有统计学意义（P〈0．01）；TanⅡA低、高剂量治疗组脑梗死体积较缺血再灌注组减小，低、高剂量组之间差异亦具有统计学意义（P〈0．01）；TanⅡA低、高剂量治疗组脑组织缺血损伤病理学改变明显轻于缺血再灌注组，TanⅡA高剂量治疗组缺血改变亦轻于低剂量治疗组。结论TanⅡA对缺血再灌注脑损伤具有保护作用，其机制可能与减轻脑缺血再灌注损伤阶段P-选择素和ICAM-1所介导的炎症反应有关，高剂量TanⅡA（30mg／kg）的保护效果更显著。

Effect of tanshinone ⅡA on the expression of P-selectin and ICAM-1 after cerebral ischemic reperfusion injury in rats

Objective To study the effect of tanshinone ⅡA on the expression of P-selectin and ICAM-1 after cerebral ischemia reperfusion (I/R)injury in rats. Methods Rats were randomly divided into 4 groups: Sham operated group, I/R group, low dose Tan ⅡA treated group and high dose Tan ⅡA treated group. The focal middle cerebral artery occlusion (MCAO) model was made by suture-occluded method. Rats were pretreated with Tan ⅡA, ig for 3d,respectively before MCAO. After 90min MCAO following 24 hours of reperfusion, the expression of P-selectin and ICAM-1 was detected with using immunohistochemistry method. Result Compared with sham operated group, the expression of P-selectin and ICAM-1 increased after reperfusion for 24 hours in the ischemic territory(all P＜0.01).Compared with I/R group, the expression of P-selectin and ICAM-1 decreased in a dose dependent manner in low and high dose Tan ⅡA treated group(P＜0.01).Compared with that of I/R group, cerebral infarction volume was decreased in a dose dependent manner in low dose Tan ⅡA treated group and high dose Tan ⅡA treated group(all P＜0.01).The change of ischemic impairment in low or high dose Tan ⅡA treated group was less than that in IR group, and the change of ischemic impairment in high dose Tan ⅡA treated group was less than that in low dose Tan ⅡA treated group. Conclusion Tan ⅡA may reduce cerebral ischemia-reperfusion inflammation injure by decreasing the expression of p-selectin and ICAM-1.Tan ⅡA plays protective effect on cerebral ischemia injury, especially when high dose of Tan ⅡA(30mg/kg)was used.