6%羟乙基淀粉血液稀释对大鼠全脑缺血/再灌注后ICAM-1表达的影响

Effect of hemodilution with 6% hydroxyethyl starch (200/0.5) on expression of intercellular adhesion molecule-1 after global cerebral ischemia- reperfusion in rats

目的 研究6％羟乙基淀粉(贺斯,200/0.5)血液稀释对大鼠全脑缺血/再灌注期血管内皮细胞细胞间粘附分子-1(ICAM-1)表达的影响。方法84只Wistar大鼠分为假手术组(S组)、缺血/再灌注组(Ⅰ组)和6％贺斯血液稀释组(H组),其中Ⅰ组和H组又各分为缺血10分钟再灌注2h、4h、8h和12h组,采用免疫组织化学方法检测脑组织ICAM-1的表达。结果Ⅰ组和H组再灌注2h、4h、8h和12h时ICAM-1的表达均较S组高(P均<0.01);H组再灌注2h、4h、8h和12h ICAM-1的表达均较Ⅰ组相应时间点低(P均<0.05)。结论(1)脑缺血/再灌注时血管内皮细胞ICAM-1的表达增加;(2)6％贺斯血液稀释降低再灌注早期阶段脑组织血管内皮细胞ICAM-1的表达。

Objective To investigate the effect of isovolumic hemodilution with 6% hydroxyethyl starch (HES) (200/0.5) on expression of intercellular adhesion molecule-1 (ICAM-1) after global cerebral ischemia-reperfusion in rats. Methods Eighty-four male Wistar rats weighing 230-280g were randomly divided into 3 groups: group Ⅱ sham operation (S , n = 20); group ischemia-reperfusion (Ⅱ , n = 32) and groupⅢ hemodilution with 6% HES (200/0.05) (H, n =32) . Group Ⅱ and group Ⅲ were further divided into 4 equal subgroups with 8 animals in each subgroup: 2h, 4h, 8h and 12h after beginning of reperfusion. Global cerebral ischemia was produced by permanent occlusion of bilateral vertebral arteries and cross-clamping of bilateral common carotid arteries for 10min and then clamping was released for reperfusion. In group Ⅲ acute normal volumic hemodilution was performed at 10 min after reperfusion was begun. 1ml/100g of blood was removed from artery and equal volume of 6% HES(200/0.5) was infused into the vein simultaneously. Hct was checked before and after hemodilution. The animals were decapitated at designed time and brain tissue was removed from ischemic area and frozen in liquid nitrogen. ICAM-1 expression was determined by using immunohistochemical technique. Results ICAM-1 expression significantly increased after 2h, 4h, 8h and 12h reperfusion in group Ⅱ and Ⅲ as compared with in group Ⅰ (P<0.01). ICAM-1 expression after 2h, 4h, 8h and 12h reperfusion in group Ⅲ was lower than that in group Ⅱ ( P < 0.05 ). Conclusion The expression of ICAM-1 after cerebral ischemia-reperfusion greatly increases, Hemodilution with 6% HES (200/0.05) can significantly reduce the increase in ICAM-1 expression induced by ischemia-reperfusion at the early period of reperfusion.