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Labeling and Imaging of Amyloid Plaques in Brain Tissue Using the Natural Polyphenol Curcumin
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Curcumin inhibits Aβ-induced microglial inflammatory responses in vitro: Involvement of ERK1/2 and p38 signaling

Xiaolei Shi1, Zhenyang Zheng1, Jie Li2

  • 1Guangdong Key Laboratory for Diagnosis and Treatment of Major Neurological Diseases, Department of Neurology, The First Affiliated Hospital, Sun Yat-sen University, No. 58 Zhongshan 2nd Road, Guangzhou 510080, People's Republic of China.

Neuroscience Letters
|March 31, 2015
PubMed

Insights

Curcumin, an anti-inflammatory compound, protects brain cells from Alzheimer's disease pathology by reducing harmful microglial activation and inflammatory responses. It inhibits key signaling pathways involved in neuroinflammation.

Area of Science:

  • Neuroscience
  • Immunology
  • Pharmacology

Background:

  • Amyloid β (Aβ) peptides trigger microglia activation, a key factor in Alzheimer's disease (AD) neuroinflammation.
  • Microglia release inflammatory mediators, exacerbating AD pathology.
  • Curcumin, derived from turmeric, exhibits anti-inflammatory properties, but its effects on Aβ-induced microglia activation require further investigation.

Purpose of the Study:

  • To investigate the protective effects of curcumin against Aβ42-induced microglia activation.
  • To elucidate the underlying molecular mechanisms of curcumin's action in Aβ-treated microglia.

Main Methods:

  • Primary microglia cultures were treated with Aβ42 and varying concentrations of curcumin.
  • Microglial viability, CD68 expression, and production of inflammatory cytokines (IL-1β, IL-6, TNF-α) were assessed.
  • Western blotting was used to analyze the phosphorylation status of ERK1/2 and p38 MAPK pathways.

Main Results:

  • Curcumin enhanced microglial viability and suppressed Aβ42-induced CD68 expression.
  • Curcumin significantly reduced Aβ42-induced production of IL-1β, IL-6, and TNF-α at both mRNA and protein levels.
  • Curcumin inhibited the phosphorylation of ERK1/2 and p38 pathways in Aβ42-activated microglia.

Conclusions:

  • Curcumin demonstrates neuroprotective effects by mitigating Aβ42-induced microglial activation and inflammation.
  • Curcumin attenuates neuroinflammation by suppressing the ERK1/2 and p38 signaling pathways.
  • Curcumin represents a potential therapeutic agent for Alzheimer's disease by modulating microglial inflammatory responses.
Keywords:
AβCurcuminInflammationMicroglia

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