Effects of pretreatment with repeated electroacupuncture on heat shock protein 70 expression after cerebral ischemia-reperfusion Injury In rats / 中华麻醉学杂志

ABSTRACT

Objective To investigate if pretreatment with repeated electroacupuncture (EA) at Baihui acupoint could increase HSP 70 expression after cerebral ischemia-reperfusion injury in rats.Methods Twenty male SD rats weighing 280-320 g were randomly divided into 2 equal groups of ten : control group received no pretreatment and EA group received pretreatment with EA at Baihui acupoint 30 min a day for 5 days. The animals in both groups were anesthetized with isoflurane. Right common carotid artery (CCA) , external and internal carotid artery (EGA, 1C A) were exposed through a longitudinal incision in the neck. EGA was ligated and a 3-0 nylon monofilament (Ethicon) with rounded tip was inserted into ICA and threaded cephalad until resistance was felt. In this way middle-cerebral artery was occluded for 120 min in both groups. The nylon filament was then withdrawn to allow reperfusion. The animals were allowed to recover. At the end of 24 h reperfusion, the animals were anesthetized with intraperitoneal pentobarbital 40 mg?kg-1 and killed. Brain was immediately removed. Two pieces of brain tissue were obtained from right parietal lobe for microscopic examination (HE staining) and determination of expression of heat shock protein (HSP) 70 using immuno-histochemistry technique.Results In EA group the levels of HSP 70 expression were significantly increased (1.94?0.57) compared with those in control group (0.86?0.35) ( P