标题：Neuronal survival is associated with 72-kDa heat shock protein expression after transient middle cerebral artery occlusion in the rat

作者：Li Y1, Chopp M, Zhang ZG, Zhang RL, Garcia JH.

网址:PMID: 7511157

求助者：fromnow

• 求助时间：2015/6/18 22:41:04
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• 文献摘要：

Induction of the 72-kDa heat shock protein expression is thought to protect neurons against the subsequent effects of ischemia. However, it is not clear whether the induction of 72-kDa heat shock protein expression by an ischemic event improves neuronal survival. To address this question, we outlined the temporal profile of neuronal induction and expression of the 72-kDa heat shock protein in a model of transient focal ischemia in the rat. Fifty two adult Wistar rats were subjected to middle cerebral artery occlusion of 2 h duration. At 0.5, 3, 6, 9, 12, 24, 48, 96 and 168 h after reopening the artery, coronal brain sections were analyzed using both immunohistochemical methods and hematoxylin and eosin staining to determine the topographic and cellular distribution of the 72-kDa heat shock protein, as well as the extent of neuronal damage. Immunoreactivity to the 72-kDa heat shock protein was not detected in neurons that were destined to become necrotic, and were located in the ischemic core of the brain lesions. However, 72-kDa heat shock protein expression was evident in morphologically intact neurons located in the peripheral zone. The earliest neuronal expression of 72-kDa heat shock protein was detected in animals in which the 2 h occlusion of the middle cerebral artery was followed by 6 h recirculation; the intensity of the 72-kDa heat shock protein immunoreactivity peaked at 48 h, and progressively disappeared 7 days after the ischemic reperfusion event.(ABSTRACT TRUNCATED AT 250 WORDS)

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