Korean J Pediatr.  2008 Oct;51(10):1112-1117. 10.3345/kjp.2008.51.10.1112.

Injury of [correction] Neurons by oxygen-glucose deprivation in organotypic hippocampal slice cultures

• Chung DC
• Hong KS
• Kang J
• Chang YP

• KMID: 2280320
• DOI: http://doi.org/10.3345/kjp.2008.51.10.1112

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 micrometer 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 micrometer 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.

Keyword

Hippocampus; Oxygen glucose deprivation; Hypoxia; Ischemia; Apoptosis; Immature; Rat; Brain

MeSH Terms

Animals
Anoxia
Apoptosis
Brain
Caspase 3
Cell Death
Fluoresceins
Fluorescence
Fluorescent Antibody Technique
Hippocampus
In Situ Nick-End Labeling
Ischemia
Neurons
Propidium
Pyramidal Cells
Rats
Reperfusion
Caspase 3
Fluoresceins
Propidium