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Injury-induced NF-kappaB activation in the hippocampus: implications for neuronal survival
C A Kassed1, T L Butler, G W Patton
1Department of Pharmacology and Therapeutics, University of South Florida, Tampa, Florida 33612, USA.
Summary
Nuclear factor kappa-light-chain-enhancer of activated B cells (NF-kappaB) p50 protein promotes hippocampal neuron survival after trimethyltin (TMT) injury. This study shows NF-kappaB activation regulates genes involved in neuroprotection and neuroplasticity.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Nuclear factor (NF)-kappaB p50 protein plays a role in neuronal survival following injury.
- Trimethyltin (TMT) exposure causes hippocampal injury, making it a model for studying neuroprotection.
Purpose of the Study:
- To investigate the role of NF-kappaB p50 in hippocampal neurons after TMT-induced injury.
- To identify genes regulated by NF-kappaB p50 in the hippocampus following TMT exposure.
Main Methods:
- Utilized transgenic kappaB-lacZ reporter mice to examine and quantitate hippocampal NF-kappaB activity post-TMT injury.
- Performed microarray analysis to compare gene expression profiles in TMT-treated nontransgenic and p50-null mice versus controls.
- Localized NF-kappaB activity within hippocampal neurons.
Main Results:
- NF-kappaB activity was significantly elevated in hippocampal neurons between 4 and 21 days after TMT injection compared to saline controls.
- Seventeen genes showed increased expression in TMT-treated nontransgenic mice but not in p50-null mice, indicating p50-dependent regulation.
- The Na+, K+-ATPase-gamma subunit was identified as a novel TMT-modulated gene in the brain.
- Several NF-kappaB-regulated genes are implicated in neuroplasticity.
Conclusions:
- NF-kappaB p50 is a crucial neuroprotective signal in the hippocampus following TMT-induced injury.
- NF-kappaB activation influences the expression of genes related to neuroplasticity.
- This research identifies novel TMT-modulated genes and provides further evidence for NF-kappaB's role in neuronal survival.