Nox5 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
NOX5 (NADPH Oxidase 5) is a gene located on chromosome 15q21.3 that encodes NADPH oxidase 5, a member of the NADPH oxidase (NOX) family of enzymes that generate reactive oxygen species (ROS)[1]. NOX5 is unique among NOX isoforms because it contains calcium-binding EF-hand domains at its N-terminus, making it directly activated by calcium rather than by protein kinase C phosphorylation.
In neurons, NOX enzymes contribute to oxidative stress, which is a key pathological feature of neurodegenerative diseases. NOX5-mediated ROS production has been implicated in neuronal death pathways in Alzheimer's disease and Parkinson's disease[2][3].
| NADPH Oxidase 5 | |
|---|---|
| Gene Symbol | NOX5 |
| Full Name | NADPH Oxidase 5 |
| Chromosome | 15q21.3 |
| NCBI Gene ID | [79400](https://www.ncbi.nlm.nih.gov/gene/79400) |
| OMIM | 607610 |
| Ensembl ID | ENSG00000195226 |
| UniProt ID | [Q96PH1](https://www.uniprot.org/uniprot/Q96PH1) |
| Associated Diseases | Alzheimer's Disease, Parkinson's Disease, Cardiovascular Disease |
NOX5 encodes a protein of approximately 755 amino acids with a molecular weight of ~93 kDa. The protein contains several distinctive domains:
Unlike other NOX isoforms (NOX1-4), NOX5 does not require phosphorylation for activation but is directly activated by calcium binding to its EF-hand domains[1:1].
NOX5 generates superoxide anion (O₂⁻) by transferring electrons from NADPH to molecular oxygen:
NADPH + O₂ → NADP⁺ + O₂⁻ + H⁺
The superoxide produced can be converted to other reactive oxygen species:
NOX5 is highly expressed in:
In the brain, NOX5 expression is relatively low compared to other NOX isoforms (NOX1, NOX2, NOX4), but it has been detected in neurons and glial cells[2:1].
NOX5 contributes to Alzheimer's disease pathogenesis through multiple mechanisms:
The calcium hypothesis of AD proposes that dysregulated calcium signaling is an early event in AD pathogenesis. Since NOX5 is calcium-activated, this provides a direct link between calcium dysregulation and oxidative stress in AD[3:1][4].
In Parkinson's disease, NOX5 may contribute to:
NOX5 is activated by:
Several NOX inhibitors have been developed that may have therapeutic potential:
| Compound | Mechanism | Development Stage |
|---|---|---|
| GKT137831 | NOX1/NOX4 inhibitor | Phase 2 trials |
| VAS2870 | Pan-NOX inhibitor | Preclinical |
| Fulvene-5 | NOX5 inhibitor | Preclinical |
NOX5 activity can be assessed through:
The study of Nox5 Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
Banfi et al. A novel H2O2-forming NADPH oxidase family expressed in phagocytes (2001). J Biol Chem. 2001. ↩︎ ↩︎
Bedard & Krause, The NOX family of ROS-generating NADPH oxidases (2007). Physiol Rev. 2007. ↩︎ ↩︎
Querfurth & LaFerla, Calcium hypothesis of Alzheimer's disease (2010). N Engl J Med. 2010. ↩︎ ↩︎
Sorce et al. NADPH oxidases in neurological diseases (2014). Trends Pharmacol Sci. 2014. ↩︎
Gao et al. NOX in neurodegeneration (2012). Biochim Biophys Acta. 2012. ↩︎