期刊
BRAIN RESEARCH
卷 1339, 期 -, 页码 70-75出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.brainres.2010.04.037
关键词
Ischemia; Excitotoxicity; Gene therapy; Glutamate; Kainic acid; HSV; Hippocampus
资金
- National Research Service Award [5F32NS10879-02]
- Exploratory/Developmental Research Grant [MH70815]
- National Institutes of Health [AG020633]
Viral vectors bearing protective transgenes can decrease neurotoxicity after varied necrotic insults. A neuron that dies necrotically releases glutamate, calcium and reactive oxygen species, thereby potentially damaging neighboring neurons. This raises the possibility that preventing such neuron death via gene therapy can secondarily protect neighboring neurons that, themselves, do not express a protective transgene. We determined whether such good neighbor effects occur, by characterizing neurons that, while uninfected themselves, are in close proximity to a transgene-bearing neuron. We tested two genes whose overexpression protects against excitotoxicity: anti-apoptotic Bcl-2, and a calcium-activated K(+) channel, SK2. Using herpes simplex virus type 2-mediated transgene delivery to hippocampal cultures, we observed good neighbor effects on neuronal survival following an excitotoxic insult. However, in the absence of insult, bad neighbor effects could also occur (i.e., where being in proximity to a neuron constitutively expressing one of those transgenes is deleterious). We also characterized the necessity for cell-cell contact for these effects. These phenomena may have broad implications for the efficacy of gene overexpression strategies in the CNS. (C) 2010 Elsevier B.V. All rights reserved.
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