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Neuroprotective Effect of Natural Alkaloid Fangchinoline Against Oxidative Glutamate Toxicity: Involvement of

Fengxia Bao1,2, Lingxue Tao3, Haiyan Zhang4,5

  • 1Laboratory of Neuropharmacology and Neurotoxicology, Shanghai University, Shanghai, 200444, China.

Cellular and Molecular Neurobiology
|July 5, 2019
PubMed

Insights

Fangchinoline (FAN) protects against oxidative glutamate toxicity, a key factor in neurodegenerative diseases like Alzheimer's. It enhances antioxidant defenses by boosting superoxide dismutase (SOD) and activating the Keap1/Nrf2 pathway.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Biochemistry

Background:

  • Oxidative glutamate toxicity is implicated in neurodegenerative diseases such as Alzheimer's disease (AD).
  • Understanding protective mechanisms against oxidative stress is crucial for developing therapeutic strategies.

Purpose of the Study:

  • To investigate the neuroprotective effects of fangchinoline (FAN) against glutamate-induced oxidative damage in HT22 cells.
  • To elucidate the underlying cellular and biochemical mechanisms of FAN's protective action.

Main Methods:

  • Cell viability assays were used to assess FAN's effect on glutamate-induced cytotoxicity.
  • Measurement of intracellular reactive oxygen species (ROS) and superoxide dismutase (SOD) activity.
  • Western blot analysis to determine the expression levels of Nrf2, HO-1, and Keap1.
  • Inhibition studies using an Nrf2 inhibitor to confirm the role of the Nrf2 pathway.

Main Results:

  • FAN demonstrated a dose-dependent protection against glutamate-induced cell death.
  • FAN significantly reduced intracellular ROS production and restored SOD activity.
  • FAN up-regulated Nrf2 and HO-1 protein levels and down-regulated Keap1 mRNA and protein levels.
  • The protective effects of FAN were abolished by an Nrf2 inhibitor, confirming pathway involvement.

Conclusions:

  • Fangchinoline exhibits significant neuroprotective effects against oxidative glutamate toxicity.
  • FAN's mechanism involves the activation of the endogenous antioxidant defense system via the Keap1/Nrf2 signaling pathway.
  • These findings suggest FAN as a potential therapeutic agent for oxidative stress-related neurodegenerative diseases.
Keywords:
FangchinolineKeap1Nrf2Oxidative stress

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