Impairment of long-term depression induced by chronic brain inflammation in rats

Sun Seek Min, Hui Yan Quan, Jinhua Ma, Ki Ho Lee, Seung Keun Back, Heung Seek Na, Seung Ho Han, Jae Yong Yee, Chan Kim, Jung Soo Han, Geun Hee Seol

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Although deficits in synaptic plasticity have been identified in aged or neuroinflamed animals with memory impairments, few studies have examined the cellular basis of plasticity in such animals. Here, we examined whether chronic neuroinflammation altered long-term depression (LTD) and studied the underlying mechanism of LTD impairment by neuroinflammation. Chronic neuroinflammation was induced by administration of lipopolysaccharide (LPS) to the fourth ventricle. Excitatory postsynaptic potentials were recorded extracellularly in the rat hippocampal CA1 area to examine alterations in synaptic plasticity. Chronic administration of LPS induced remarkable memory impairment in the Morris water maze test. N-methyl-d-aspartate receptor (NMDAR)-dependent LTD was almost absent in LPS-infused animals. The AMPA receptor (AMPAR)-mediated synaptic response was reduced in the LPS-infused group. These results suggest that reduction in NMDAR-dependent LTD might arise because of alterations in postsynaptic AMPARs as well as NMDARs and that such changes may be present in mild and early forms of Alzheimer-type dementia.

Original languageEnglish
Pages (from-to)93-97
Number of pages5
JournalBiochemical and biophysical research communications
Volume383
Issue number1
DOIs
Publication statusPublished - 2009 May 22

Keywords

  • Dementia
  • Hippocampus
  • Long-term depression
  • NMDAR-dependent LTD
  • NMDAR-independent LTD
  • Neuroinflammation

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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