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Stereotaxic Infusion of Oligomeric Amyloid-beta into the Mouse Hippocampus
Published on: June 17, 2015
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Notoginsenoside R1 increases neuronal excitability and ameliorates synaptic and memory dysfunction following amyloid
Shijun Yan1, Zhi Li2, Hang Li2
11] State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China [2] Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Department of Pathology and Cell Biology, Columbia University, New York, NY10032, USA [3].
Scientific Reports
|September 13, 2014
Summary
Notoginsenoside R1 (NTR1) enhances neuronal excitability and protects against Alzheimer's disease (AD) related synaptic and memory deficits. This compound may offer a novel therapeutic strategy for AD by modulating neuronal function.
Area of Science:
- Neuroscience
- Pharmacology
- Biochemistry
Background:
- Alzheimer's disease (AD) is characterized by neurodegeneration and synaptic dysfunction, linked to reduced neuronal activity.
- Amyloid-beta (Aβ) oligomers are implicated in AD pathogenesis, causing synaptic impairments.
Purpose of the Study:
- To investigate the effects of Notoginsenoside R1 (NTR1) on neuronal excitability.
- To assess NTR1's efficacy in ameliorating synaptic and memory deficits in AD models.
Main Methods:
- Electrophysiological recordings (extracellular and intracellular) in acute hippocampal slices.
- In vitro and in vivo studies using Aβ oligomers and the APP/PS1 mouse model of AD.
- Assessment of membrane ion channel activity and synaptic plasticity, including long-term potentiation (LTP).
Main Results:
- NTR1 increased neuronal excitability in hippocampal CA1 pyramidal neurons by inhibiting voltage-gated K(+) currents.
- NTR1 reversed Aβ1-42 oligomer-induced impairments in LTP.
- Oral administration of NTR1 improved learning performance in APP/PS1 mice.
- The protective effect of NTR1 against Aβ-induced LTP impairment was abolished by reducing spontaneous neuronal firing.
Conclusions:
- NTR1 enhances neuronal excitability and synaptic plasticity, offering protection against Aβ-induced neurotoxicity.
- NTR1 demonstrates potential as a therapeutic agent for Alzheimer's disease by improving synaptic function and memory.
- The findings reveal a novel mechanism of neuroprotection involving the modulation of neuronal cell strength.
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