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Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording
14:27

Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording

Published on: August 11, 2019

Chronic brain inflammation impairs two forms of long-term potentiation in the rat hippocampal CA1 area

Sun Seek Min1, Hui Yan Quan, Jinhua Ma

  • 1Department of Physiology and Biophysics, Eulji University School of Medicine, Daejeon 301-832, South Korea.

Neuroscience Letters
|May 12, 2009
PubMed

Insights

Chronic neuroinflammation impairs spatial memory and synaptic plasticity in rats. This involves reduced N-methyl-d-aspartate receptor (NMDAR)-dependent and voltage-dependent calcium channel (VDCC)-dependent long-term potentiation (LTP).

Area of Science:

  • Neuroscience
  • Neuroinflammation
  • Alzheimer's Disease Research

Background:

  • Neuroinflammation, marked by activated microglia, is implicated in Alzheimer's disease (AD) progression.
  • Understanding how neuroinflammation impacts synaptic plasticity is crucial for AD pathogenesis.

Purpose of the Study:

  • To investigate the effects of chronic neuroinflammation on N-methyl-d-aspartate receptor (NMDAR)-dependent and NMDAR-independent long-term potentiation (LTP).
  • To assess the impact of induced chronic neuroinflammation on spatial memory and hippocampal synaptic function.

Main Methods:

  • Chronic neuroinflammation was induced in rats via continuous intracerebroventricular infusion of lipopolysaccharide (LPS).
  • Spatial memory was evaluated using the Morris water maze test.
  • Synaptic plasticity, including NMDAR-dependent and VDCC-dependent LTP, was measured in the hippocampal CA1 region via extracellular field recordings.

Main Results:

  • Chronic LPS administration resulted in significant spatial memory impairment in rats.
  • Both NMDAR-dependent and NMDAR-independent LTP induction were significantly attenuated in the hippocampal CA1 synapses of LPS-infused rats.
  • These findings indicate that chronic neuroinflammation impairs both major forms of synaptic plasticity.

Conclusions:

  • Chronic neuroinflammation leads to impaired spatial memory and reduced LTP, affecting both NMDAR-dependent and VDCC-dependent pathways.
  • The observed attenuation of synaptic plasticity may stem from impaired NMDAR and L-type Ca2+ channel function due to elevated inflammatory mediators.
  • These neuroinflammatory effects on synaptic plasticity could contribute to the cognitive decline seen in dementia and Alzheimer's disease.

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