PRDX5 (Peroxiredoxin 5) is a unique member of the peroxiredoxin family exhibiting both peroxidase and peroxynitrite reductase activities["@rhee2011"]. It is the only peroxiredoxin with dual localization to the cytosol and mitochondria, making it a crucial defender against oxidative stress in multiple cellular compartments["@knoops2016"]. PRDX5 is constitutively expressed at high levels in [neurons](/entities/neurons) and glial cells, with particularly high expression in the [hippocampus](/brain-regions/hippocampus) and cerebral [cortex](/brain-regions/cortex)[@sasaki2002].
Dual Subcellular Localization: Exists in both the cytosol and mitochondria
Unique Catalytic Mechanism: Uses both Cys^47 and Cys^151 for catalytic activity
Anti-inflammatory Properties: Inhibits [NF-κB](/entities/nf-kb) and AP-1 signaling pathways[@han2012]
Disease Associations
Alzheimer's Disease
PRDX5 is significantly downregulated in AD hippocampus and temporal cortex[@kim2004]. The enzyme protects against [Aβ](/proteins/amyloid-beta)-induced oxidative stress and neuronal [apoptosis](/entities/apoptosis). PRDX5 overexpression reduces mitochondrial dysfunction and caspase-3 activation in response to Aβ treatment[@wang2015].
Parkinson's Disease
PRDX5 protects against 6-OHDA and MPTP-induced dopaminergic neuron death[@qu2014]. Its mitochondrial localization is particularly important for protecting against mitochondrial oxidative stress in PD models.
Stroke and Cerebral Ischemia
PRDX5 is upregulated in response to ischemic injury and provides neuroprotection through its peroxidase activity[@zhou2013].
[Rhee SG, et al, Peroxiredoxin 5: Structure, mechanism, and function of the mammalian 2-Cys peroxiredoxin (2011)](https://pubmed.ncbi.nlm.nih.gov/21222505/)
[Knoops B, et al, Peroxiredoxin 5: Structure, mechanism, functions, and evolutionary relationships (2016)](https://pubmed.ncbi.nlm.nih.gov/26824633/)
[Sasaki K, et al, Peroxiredoxin 5 is expressed in the nervous system and is upregulated in neurodegenerative diseases (2002)](https://pubmed.ncbi.nlm.nih.gov/12106678/)
[Dubuisson M, et al, Human peroxiredoxin 5 is a dual-function enzyme (2004)](https://pubmed.ncbi.nlm.nih.gov/15084584/)
[Han YH, et al, Peroxiredoxin V inhibits neuronal cell death (2012)](https://pubmed.ncbi.nlm.nih.gov/23132273/)
[Kim SU, et al, Peroxiredoxin 5 expression in Alzheimer's disease (2004)](https://pubmed.ncbi.nlm.nih.gov/15235805/)
[Wang Y, et al, Overexpression of peroxiredoxin 5 protects against amyloid beta-induced neurotoxicity (2015)](https://pubmed.ncbi.nlm.nih.gov/25727067/)
[Qu D, et al, Neuroprotective role of peroxiredoxin 5 in models of Parkinson's disease (2014)](https://pubmed.ncbi.nlm.nih.gov/24881833/)
[Zhou Y, et al, Peroxiredoxin 5 is upregulated after cerebral ischemia (2013)](https://pubmed.ncbi.nlm.nih.gov/23695523/)
Pathway Diagram
The following diagram shows the key molecular relationships involving PRDX5 — Peroxiredoxin 5 discovered through SciDEX knowledge graph analysis: