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Effect of Sinapic Acid on Scopolamine-Induced Learning and Memory Impairment in SD Rats.

In-Seo Lee1, Ga-Young Choi2, Inturu Sreelatha1

  • 1Department of Gerontology (AgeTech Service Convergence Major), Graduate School of East-West Medical Science, Kyung Hee University, Yongin 17104, Republic of Korea.

Brain Sciences
|March 29, 2023
PubMed
Summary

Sinapic acid, a plant-derived compound, shows promise in treating Alzheimer's disease by improving memory and cognitive function. It restores long-term potentiation and alleviates neuroinflammation, offering potential for neurodegenerative disorders.

Keywords:
Alzheimer’s diseaseanti-inflammatorylearning and memorylong-term potentiationscopolaminesinapic acid

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Biochemistry

Background:

  • Aging is associated with cognitive decline, with Alzheimer's disease (AD) being a leading cause of dementia.
  • AD pathogenesis involves complex factors including amyloid plaques, tau tangles, oxidative stress, neuroinflammation, and cholinergic dysfunction.
  • Sinapic acid, a natural compound, possesses anti-inflammatory and antioxidant properties and acts as an acetylcholine esterase inhibitor.

Purpose of the Study:

  • To investigate the electrophysiological effects of sinapic acid on memory and learning.
  • To evaluate sinapic acid's efficacy in ameliorating scopolamine-induced cognitive impairment.
  • To explore sinapic acid's impact on key molecular pathways involved in memory and neuroinflammation.

Main Methods:

  • Organotypic hippocampal slice cultures were used to assess long-term potentiation (LTP) using field excitatory postsynaptic potential (fEPSP) recordings.
  • Behavioral tests (Y-maze, Passive Avoidance, Morris Water Maze) were conducted in rats orally administered sinapic acid following scopolamine-induced memory impairment.
  • Hippocampal levels of BDNF, TrkB, COX-2, and IL-1β were analyzed.

Main Results:

  • Sinapic acid dose-dependently enhanced fEPSP activity and restored scopolamine-impaired LTP.
  • Sinapic acid administration significantly improved spatial and avoidance memory in behavioral tests.
  • Sinapic acid counteracted scopolamine-induced reductions in BDNF and TrkB, and inhibited increases in COX-2 and IL-1β.

Conclusions:

  • Sinapic acid effectively restores LTP and cognitive function impaired by cholinergic blockade.
  • Sinapic acid mitigates neuroinflammation and supports neurotrophic signaling pathways.
  • Sinapic acid demonstrates significant potential as a therapeutic agent for neurodegenerative cognitive impairments like Alzheimer's disease.