Quercetin Increases Mitochondrial Biogenesis and Reduces Free Radicals in Neuronal SH-SY5Y Cells

Area of Science:

• Neuroscience
• Cell Biology
• Biochemistry

Background:

• Alzheimer's disease (AD) is a prevalent neurodegenerative disorder linked to dementia.
• Oxidative stress and impaired mitochondrial biogenesis are implicated in AD pathogenesis.
• Reduced mitochondrial biogenesis is observed in AD brains.

Purpose of the Study:

• To investigate Quercetin's (QE) potential to counteract amyloid beta (Aβ) accumulation.
• To examine QE's effect on hydrogen peroxide (H₂O₂)-induced oxidative stress in neuronal cells.
• To assess QE's impact on mitochondrial biogenesis pathways.

Main Methods:

• Utilized SH-SY5Y neuroblastoma cells exposed to H₂O₂ to model oxidative stress.
• Administered Quercetin (QE) to assess its protective effects.
• Measured expression of mitochondrial biogenesis proteins (SIRT1, PGC-1α, TFAM) and ADAM10.
• Quantified reactive oxygen species (ROS) production, apoptosis, and Aβ levels.

Main Results:

• QE significantly stimulated the expression of SIRT1, PGC-1α, and TFAM, activating mitochondrial biogenesis.
• QE increased ADAM10 expression, a key enzyme in amyloid precursor protein processing.
• QE reduced H₂O₂-induced ROS production, apoptosis, and Aβ accumulation in SH-SY5Y cells.

Conclusions:

• Quercetin effectively enhances mitochondrial biogenesis and protects neuronal cells from oxidative stress.
• QE demonstrates potential as a therapeutic agent for mitigating AD-related neuronal damage.
• Targeting mitochondrial pathways with compounds like QE may offer a novel strategy for AD intervention.