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DJ-1 induces thioredoxin 1 expression through the Nrf2 pathway.
Joo-Young Im1, Kang-Woo Lee, Jong-Min Woo
1Center for Neurodegenerative and Neuroimmunologic Diseases, Department of Neurology, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, Piscataway, NJ 08854, USA.
Human Molecular Genetics
|April 12, 2012
Summary
DJ-1 protein boosts neuroprotection by increasing thioredoxin 1 (Trx1) expression through the Nrf2 pathway, crucial for combating oxidative stress in Parkinson's disease research.
Area of Science:
- Molecular Biology
- Neuroscience
- Biochemistry
Background:
- DJ-1 is a multifunctional protein implicated in Parkinson's disease pathogenesis when mutated.
- Its neuroprotective mechanisms, particularly its role in regulating gene expression, remain incompletely understood.
- Understanding DJ-1's function is critical for developing therapeutic strategies against neurodegenerative diseases.
Purpose of the Study:
- To elucidate the mechanism by which DJ-1 confers neuroprotection, focusing on its transcriptional regulatory activities.
- To investigate the role of thioredoxin 1 (Trx1) in DJ-1-mediated cytoprotection.
- To identify the specific transcription factors and regulatory elements involved in DJ-1's action.
Main Methods:
- Investigated DJ-1's effect on Trx1 expression in cell lines (SH-SY5Y) and mouse models.
- Utilized DJ-1 knockdown, DJ-1 knockout, Trx1 knockdown, and pharmacological inhibitors.
- Performed promoter analysis of the Trx1 gene and assessed the role of the transcription factor Nrf2.
Main Results:
- Wild-type DJ-1 significantly increased Trx1 expression, while mutant isoforms did not.
- DJ-1-mediated protection against oxidative stress was partially dependent on Trx1 and involved the activation of the AKT pathway.
- DJ-1 enhances Trx1 expression by promoting Nrf2 translocation to the nucleus and its binding to the antioxidant response element (ARE) on the Trx1 promoter.
Conclusions:
- DJ-1 confers neuroprotection against oxidative stress by inducing Trx1 expression via the Nrf2-mediated transcriptional pathway.
- This study reveals a novel mechanism underlying DJ-1's antioxidant function, highlighting the DJ-1/Nrf2/Trx1 axis.
- Findings provide a deeper understanding of Parkinson's disease molecular pathology and potential therapeutic targets.
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