title: Gadd45b is a novel mediator of neuronal apoptosis in ischemic stroke.
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.
authors: Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors: Bin
authors: B
authors: Liu
authors: Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors: Yan-hong
authors: YH
authors: Zhang
authors: Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors: Ying
authors: Y
authors: Jiang
authors: Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors: Long-ling
authors: LL
authors: Li
authors: Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors: Qian
authors: Q
authors: Chen
authors: Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors: Guo-qian
authors: GQ
authors: He
authors: Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors: Xiao-dan
authors: XD
authors: Tan
authors: Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors: Chang-qing
authors: CQ
authors: Li
mesh_terms: D000818:Animals; D000943:Antigens, Differentiation / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D017209:Apoptosis / Q000235:genetics; D002545:Brain Ischemia / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D053148:Caspase 3 / Q000378:metabolism; D015536:Down-Regulation; D008297:Male; D009474:Neurons / Q000473:pathology*; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D034622:RNA Interference; D017207:Rats, Sprague-Dawley; D020521:Stroke / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D051028:bcl-2-Associated X Protein / Q000378:metabolism; D000097642:GADD45 Proteins
chemical_list: D000943:Antigens, Differentiation; D053148:Caspase 3; D019253:Proto-Oncogene Proteins c-bcl-2; D051028:bcl-2-Associated X Protein; C494828:Bax protein, rat; C508094:Gadd45b protein, rat; D000097642:GADD45 Proteins
keywords: Apoptosis; BDNF; Gadd45b; MCAO