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Inhibition of hexokinase leads to neuroprotection against excitotoxicity in organotypic hippocampal slice culture

Authors
 Kyung Hee Lee ; Ji Ho Park ; Bae Hwan Lee ; Taick Sang Nam ; Hyejung Lee ; Ran Won 
Citation
 Journal of Neuroscience Research, Vol.89(1) : 96~107, 2011 
Journal Title
 Journal of Neuroscience Research 
ISSN
 0360-4012 
Issue Date
2011
Abstract
During seizures, glucose concentrations are high in the hippocampus. Mitochondrial hexokinase (HK) catalyzes the first essential step of glucose metabolism and directly couples extramitochondrial glycolysis to intramitochondrial oxidative phosphorylation. The neuroprotective effects of an HK inhibitor, 3-bromopyruvate (3-BrPA), on kainic acid (KA)-induced excitotoxic injury were investigated. Hippocampal slices were prepared from hippocampi of 6-8-day-old rats using a tissue chopper and placed on a membrane insert. After a treatment with KA (5 μM) for 15 hr, neuronal death was quantified by propidium iodide (PI), cresol violet, and TUNEL staining. KA-induced cell death was significantly prevented by 30 μM 3-BrPA treatment. According to Western blots, the expression level of phospho-Akt increased after 3-BrPA treatment. The induction of long-term potentiation (LTP) at 48 hr after 3-BrPA treatment tended to increase in the CA1 area compared with the KA-only group, but the difference was not significant. Blocking the PI3 kinase/Akt pathway using LY294002 reversed the neuroprotective effect of 3-BrPA. These results suggest that inhibition of HK may play a protective role against neuronal death in KA-induced excitotoxic injury.
URI
http://ir.ymlib.yonsei.ac.kr/handle/22282913/92747
DOI
10.1002/jnr.22525
Appears in Collections:
1. 연구논문 > 1. College of Medicine > Dept. of Physiology
Yonsei Authors
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Link
 http://onlinelibrary.wiley.com/doi/10.1002/jnr.22525/abstract;jsessionid=6904381C41FB8EE9528B5E11FA5A0ED4.f01t04
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