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Published on: December 22, 2008
Interleukin-18 regulates motor activity, anxiety and spatial learning without affecting synaptic plasticity.
Takahiro Yaguchi1, Tetsu Nagata, Dongqin Yang
1Division of Bioinformation, Department of Physiology, Hyogo College of Medicine, 1-1 Mukogawa-cho, Nishinomiya Hyogo 663-8501, Japan.
Behavioural Brain Research
|September 5, 2009
Summary
Interleukin-18 (IL-18) regulates exploratory activity, fear memory, and spatial learning. This study shows IL-18 is critical for these cognitive functions in mice.
Area of Science:
- Neuroscience
- Immunology
- Cognitive Science
Background:
- Interleukin-18 (IL-18) is a cytokine involved in immune responses.
- The role of IL-18 in cognitive functions, including memory and learning, is not fully understood.
- Previous research suggests a link between inflammation and cognitive deficits.
Purpose of the Study:
- To investigate the role of Interleukin-18 (IL-18) in regulating cognitive functions such as exploratory activity, fear memory, and spatial learning.
- To determine if IL-18 influences synaptic plasticity in the hippocampus.
- To assess the impact of IL-18 deficiency on various behavioral tests in mice.
Main Methods:
- Used wild-type and Interleukin-18 knock-out (IL-18 KO) mice.
- Assessed hippocampal long-term potentiation (LTP) and long-term depression (LTD) in brain slices.
- Conducted behavioral tests: open-field test, passive avoidance test, and water maze test.
- Administered IL-18 intraventricularly to IL-18 KO mice.
Main Results:
- IL-18 deficiency did not affect hippocampal LTP/LTD.
- IL-18 KO mice showed suppressed rearing activity and impaired fear memory retention.
- Spatial learning acquisition was significantly impaired in IL-18 KO mice.
- Recombinant IL-18 administration restored spatial learning in IL-18 KO mice.
Conclusions:
- Interleukin-18 (IL-18) is a critical regulator of exploratory activity, fear memory, and spatial learning.
- IL-18 plays a significant role in cognitive processes independent of its effects on hippocampal synaptic plasticity.
- Targeting IL-18 may offer therapeutic potential for cognitive impairments.
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