补阳还五汤对大鼠脑缺血后蛋白激酶B1和c-Jun氨基末端激酶1/2表达的影响

摘要

Objective To explore the effect of Buyang Huanwu decoction(BYHWD)on protein kinase B1 (AKT1)and c-Jun amino terminal kinase 1/2(JNK1/2)in rats after focal cerebral ischemia. Methods According to the random number table method,48 Sprague-Dawley(SD)rats were randomly allocated to four groups:normal control group,sham-operated group,model group,traditional BYHWD group(each n=12). The rat model of right focal cerebral ischemia was established by the method of middle cerebral artery occlusion(MCAO). The rats in BYHWD group were ingested with the decoction of BYHWD 14.2 g/kg after 2 hours of the operation(the main ingredients of BYHWD including astragalus mongholicus 120 g,Chinese angelica 6 g,radix paeoniae rubra 4.5 g, rhizoma ligustici wallichii 3 g,safflower 3 g,peach kernel 3 g,earthworm 3 g),once a day for 7 days. Other groups of animals were given the same amount of normal saline orally. After operation,on the 7th day,the animals were killed,and their brains were taken out. The reverse transcription-polymerase chain reaction(RT-PCR)assay was used to detect AKT1 mRNA expression,and immunohistochemical method was applied to measure JNK1/2 protein expression. Results Compared with normal control and sham-operated groups,the level of AKT1 mRNA expression〔absorbance(A)〕was decreased obviously(0.48±0.08 vs. 0.63±0.11,0.61±0.09,both P<0.05),and the number of JNK1/2 positive cells(cell/mm2)was increased significantly(34.13±4.57 vs. 16.15±1.09,16.23±2.05,both P<0.05)in model group;compared with model group,the AKT1 mRNA expression in brain tissue(0.93±0.11)and the number of JNK1/2 positive cells(45.04±5.68)was increased significantly in BYHWD group,the differences being statistically significant(P<0.05 or P<0.01). Conclusion BYHWD can up-regulate expressions of AKT1 mRNA and JNK1/2 positive cells in ischemic brain tissue that is one of the mechanisms in the protection of brain.%目的探讨补阳还五汤对脑缺血后大鼠蛋白激酶B1（AKT1）和c-Jun氨基末端激酶1/2（JNK1/2）的影响。方法将48只SD大鼠按随机数字表法分为正常对照组、假手术组、模型组、补阳还五汤组，每组12只。采用大脑中动脉闭塞法（MCAO）建立右侧局灶性脑缺血大鼠模型。补阳还五汤组大鼠于术后2h起灌服补阳还五汤（主要由生黄芪120g、当归6g、赤芍4.5g、川芎3g、西红花3g、桃仁3g、广地龙3g组成）14.2 g/kg，每日1次，连续7 d。其他各组动物均给予等体积生理盐水。于第7日处死大鼠，取脑组织，采用逆转录-聚合酶链反应（RT-PCR）测定AKT1 mRNA表达，采用免疫组化法检测JNK1/2蛋白表达。结果与正常对照组和假手术组比较，模型组AKT1 mRNA表达量〔吸光度（A）值〕明显降低（0.48±0.08比0.63±0.11、0.61±0.09，均P＜0.05），JNK1/2阳性细胞数（个/mm2）明显增多（34.13±4.57比16.15±1.09、16.23±2.05，均P＜0.05）；与模型组比较，补阳还五汤组脑组织中AKT1 mRNA表达（0.93±0.11）和JNK1/2阳性细胞数（45.04±5.68）明显增加，差异均有统计学意义（P＜0.05或P＜0.01）。结论补阳还五汤可上调缺血脑组织AKT1 mRNA和JNK1/2阳性细胞数表达，是其脑保护作用机制之一。