Biomedical Research
Online ISSN : 1880-313X
Print ISSN : 0388-6107
ISSN-L : 0388-6107
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Synapse-specific effects of IL-1β on long-term potentiation in the mouse hippocampus
Koji HOSHINOKan HASEGAWAHaruyuki KAMIYAYuji MORIMOTO
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2017 Volume 38 Issue 3 Pages 183-188

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Abstract

Interleukin-1β (IL-1β) is a key molecule in the inflammatory responses elicited during infection and injury. It exerts local effects on synaptic plasticity by binding to IL-1 receptors that are expressed at high levels in the hippocampus. We examined the effects of IL-1β on synaptic plasticity in different hippocampal regions in acute mouse brain slices by measuring long-term potentiation (LTP). IL-1β (1 ng/mL) was applied for 30 min before LTP was induced with high-frequency stimulation (HFS). LTP was significantly impaired by either IL-1β application to the Schaffer collateral-CA1 synapses or the associational/commissural (A/C) fiber-CA3 synapses, which are both dependent on N-methyl-D-aspartate (NMDA) receptor activation. However, mossy fiber-CA3 LTP, which is expressed presynaptically in an NMDA-independent manner, was not impaired by IL-1β. Our results demonstrate that IL-1β exerts variable effects on LTP at different kinds of synapses, indicating that IL-1β has synapse-specific effects on hippocampal synaptic plasticity.

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© 2017 Biomedical Research Press
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