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International Journal Of Bilogical Sciences

.: Home > International Journal Of Bilogical Sciences > 2015 > Volume 11 Number 3 > Bin Liu, Yan-hong Zhang, Ying Jiang, Long-ling Li, Qian Chen, Guo-qian He, Xiao-dan Tan, Chang-qing Li

Gadd45b is a Novel Mediator of Neuronal Apoptosis in Ischemic Stroke

Bin Liu, Yan-hong Zhang, Ying Jiang, Long-ling Li, Qian Chen, Guo-qian He, Xiao-dan Tan, Chang-qing Li
Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China Current Addresses: Department of Neurology, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, China  Corresponding author: E-mail:licq9217@cqmu.edu.cn
Abstract :

Apoptosis plays an essential role in ischemic stroke pathogenesis. Research on the process of neuronal apoptosis in models of ischemic brain injury seems promising. The role of growth arrest and DNA-damage-inducible protein 45 beta (Gadd45b) in brain ischemia has not been fully examined to date. This study aims to investigate the function of Gadd45b in ischemia-induced apoptosis. Adult male Sprague-Dawley rats were subjected to brain ischemia by middle cerebral artery occlusion (MCAO). RNA interference (RNAi) system, which is mediated by a lentiviral vector (LV), was stereotaxically injected into the ipsilateral lateral ventricle to knockdown Gadd45b expression. Neurologic scores and infarct volumes were assessed 24 h after reperfusion. Apoptosis-related molecules were studied using immunohistochemistry and Western blot analysis. We found that Gadd45b-RNAi significantly increased infarct volumes and worsened the outcome of transient focal cerebral ischemia. Gadd45b-RNAi also significantly increased neuronal apoptosis as indicated by increased levels of Bax and active caspase-3, and decreased levels of Bcl-2. These results indicate that Gadd45b is a beneficial mediator of neuronal apoptosis.

Keywords :
MCAO, Gadd45b, BDNF, Apoptosis

Date Deposited : 22 Feb 2016 09:46

Last Modified : 22 Feb 2016 09:46

Official URL: http://www.ijbs.com/v11i3

Volume 11, Number 3, - 2015 , ISSN 1449-2288

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