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http://dx.doi.org/10.3345/kjp.2008.51.10.1112

Injury of Neurons by Oxygen-Glucose Deprivation in Organotypic Hippocampal Slice Culture  

Chung, David Chanwook (Department of Pediatrics, College of Medicine, Dankook University)
Hong, Kyung Sik (Department of Pediatrics, College of Medicine, Dankook University)
Kang, Jihui (Department of Pediatrics, College of Medicine, Dankook University)
Chang, Young Pyo (Department of Pediatrics, College of Medicine, Dankook University)
Publication Information
Clinical and Experimental Pediatrics / v.51, no.10, 2008 , pp. 1112-1117 More about this Journal
Abstract
Purpose : We intended to observe cell death and apoptotic changes in neurons in organotypic hippocampal slice cultures following oxygen-glucose deprivation (OGD), using propidium iodide (PI) uptake, Fluoro-Jade (FJ) staining, TUNEL staining and immunofluorescent staining for caspase-3. Methods : The hippocampus of 7-day-old rats was cut into $350{\mu}m$ slices. The slices were cultured for 10 d (date in vitro, DIV 10) and and exposed to OGD for 60 min at DIV 10. They were then incubated for reperfusion under normoxic conditions for an additional 48 h. Fluorescence of PI uptake was observed at predetermined intervals, and the cell death percentage was recorded. At 24 h following OGD, the slices were Cryo-cut into $15{\mu}m$ thicknesses, and Fluoro-Jade staining, TUNEL staining, and immunofluorescence staining for caspase-3 were performed. Results : 1) PI uptake was restricted to the pyramidal cell layer and DG in the slices after OGD. The fluorescent intensities of PI increased from 6 to 48 h during the reperfusion stage. The cell death percentage significantly increased time-dependently in CA1 and DG following OGD (P<0.05). 2) At 24 h after OGD, many FJ positive cells were detected in CA1 and DG. Some neurons had distinct nuclei and processes while others had fragmented nuclei and disrupted processes in CA1. TUNEL and immunofluorescent staining for caspase-3 showed increased expression of TUNEL labeling and caspase-3 in CA1 and DG at 24 h after OGD. Conclusion : The numerous dead cells in the slice cultures after OGD tended to display apoptotic changes mediated by the activation of caspase-3.
Keywords
Hippocampus; Oxygen glucose deprivation; Hypoxia; Ischemia; Apoptosis; Immature; Rat; Brain;
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