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Critical Role of Endoplasmic Reticulum Stress in Cognitive Impairment Induced by Microcystin-LR

Fei Cai1, Jue Liu2, Cairong Li3

  • 1Department of Pharmacology, Hubei University of Science and Technology, Xianning 437100, China. cf@mail.hbust.com.cn.

International Journal of Molecular Sciences
|November 26, 2015
PubMed

Insights

Microcystin-leucine-arginine (MCLR) from cyanobacteria induces cognitive deficits by causing hippocampal damage via endoplasmic reticulum (ER) stress. Tauroursodeoxycholic acid (TUDCA) can mitigate these effects, suggesting ER stress as a therapeutic target.

Area of Science:

  • Neuroscience
  • Toxicology
  • Cell Biology

Background:

  • Cyanobacteria-derived microcystin-leucine-arginine (MCLR) is linked to hippocampal damage and cognitive impairment.
  • The precise mechanisms underlying MCLR-induced cognitive deficits remain unclear.

Purpose of the Study:

  • To investigate the role of endoplasmic reticulum (ER) stress in MCLR-induced cognitive impairment.
  • To explore the potential therapeutic effects of tauroursodeoxycholic acid (TUDCA) in mitigating MCLR toxicity.

Main Methods:

  • Morris water maze test and electrophysiological studies in male Wistar rats.
  • Real-time PCR and immunohistochemistry to assess ER stress markers (GRP78, CHOP, caspase 12).
  • Analysis of ER ultrastructure and neuronal apoptosis in the hippocampus.

Main Results:

  • MCLR exposure caused significant spatial memory deficits in rats.
  • MCLR exposure led to increased expression of ER stress markers (GRP78, CHOP, caspase 12) and neuronal apoptosis.
  • Co-administration of TUDCA ameliorated memory impairment, reduced ER stress markers, and prevented apoptotic cell death.

Conclusions:

  • Endoplasmic reticulum (ER) stress is a key mechanism in MCLR-induced cognitive impairment.
  • TUDCA effectively alleviates MCLR-induced hippocampal damage and cognitive deficits by reducing ER stress.
  • Targeting ER stress pathways presents a potential therapeutic strategy for managing cyanotoxin-induced neurotoxicity.
Keywords:
cognitive impairmentendoplasmic reticulum stressmicrocystin-LRtauroursodeoxycholic acid

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