Journal
BRAIN BEHAVIOR AND IMMUNITY
Volume 24, Issue 2, Pages 243-253Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbi.2009.10.002
Keywords
Interleukin-1; Inflammation; Learning; Memory; Hippocampus; Gender; Activity-regulated cytoskeletal protein
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Funding
- NIH [RO1 AG030149, HD056235, AG028271, T32 NS051152]
- Coleman Institute
- Anna & John J. Sie Foundation
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Neuroinflammatory conditions such as traumatic brain injury, aging, Alzheimer's disease, and Down syndrome are often associated with cognitive dysfunction. Much research has targeted inflammation as a causative mediator of these deficits, although the diverse cellular and molecular changes that accompany these disorders obscure the link between inflammation and impaired memory. Therefore, we used a transgenic mouse model with a dormant human IL-1 beta excisional activation transgene to direct overexpression of IL-1 beta with temporal and regional control. Two weeks of hippocampal IL-1 beta overexpression impaired long-term contextual and spatial memory in both male and female mice, while hippocampal-independent and short-term memory remained intact. Human IL-1 beta overexpression activated glia, elevated murine IL-1 beta protein and PGE(2) levels, and increased pro-inflammatory cytokine and chemokine mRNAs specifically within the hippocampus, while having no detectable effect on inflammatory mRNAs in the liver. Sustained neuroinflammation also reduced basal and conditioning-induced levels of the plasticity-related gene Arc. (C) 2009 Elsevier Inc. All rights reserved.
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