| 2001 |
NOX3 (GP91-3) encodes a ~65 kDa protein predicted to contain 5–6 transmembrane alpha-helices with heme-binding regions and a flavoprotein homology domain with FAD and NADPH binding sites, classifying it as a superoxide-generating NADPH oxidase homolog of gp91phox. It is expressed primarily in fetal tissues. |
cDNA cloning, sequence analysis, tissue expression profiling |
Gene |
Medium |
11376945
|
| 2004 |
NOX3 is highly and selectively expressed in the inner ear (vestibular and cochlear sensory epithelia and spiral ganglions). Transfection of HEK-293 cells with NOX3 demonstrated superoxide production that was enhanced by co-expression with cytoplasmic NOX subunits (p47phox/p67phox or NOXO1/NOXA1). NOX3-dependent superoxide production required a stimulus without subunits or with phagocyte subunits, but was stimulus-independent with NOXO1/NOXA1. Cisplatin pre-incubation markedly enhanced NOX3-dependent superoxide production. |
Real-time PCR, microdissection, in situ hybridization, HEK-293 cell transfection, superoxide assay |
The Journal of biological chemistry |
High |
15326186
|
| 2004 |
Loss-of-function mutations in Nox3 in mice result in absence of otoconia (biomineral particles in the utricle and saccule) and profound vestibular dysfunction, establishing Nox3 as indispensable for otoconia morphogenesis in the inner ear. |
Genetic allelic series in mice (head tilt locus), vestibular phenotype characterization |
Genes & development |
High |
15014044
|
| 2004 |
Nox3 is activated by regulatory subunits p47phox/p67phox (like gp91phox) and by NOXO1 alone (unlike gp91phox). Nox3 activity with p47phox/p67phox is constitutively high (not requiring PMA stimulation). NOXO1 strongly activates Nox3 without requiring NOXA1 or p67phox, and the p67phox activation domain mutation (V204A) that abolishes gp91phox activation still supports Nox3 activation. |
Cell-based superoxide production assays, transient transfection of HEK-293 cells with Nox subunit combinations, PMA stimulation assays |
The Journal of biological chemistry |
High |
15181005
|
| 2005 |
Nox3 constitutively produces superoxide in a p22phox-dependent manner without requiring organizer or activator subunits. Nox3 physically interacts with and stabilizes p22phox. Organizers p47phox and Noxo1 enhance Nox3 activity via their interaction with p22phox. The small GTPase Rac, essential for gp91phox/Nox2 activity, is dispensable for Nox3 activity. |
Cell-based superoxide assays, co-immunoprecipitation, siRNA knockdown of p22phox, transfection of multiple cell types |
The Journal of biological chemistry |
High |
15824103
|
| 2006 |
Rac1 regulates Nox3 activity through the Nox activators (p67phox or Noxa1); Rac1 dominant-negative mutants, Noxa1 mutants defective in Rac binding, and siRNA-mediated Rac1 silencing all inhibit Nox3. Nox3 expression promotes p22phox transport to the plasma membrane. Nox3 activity is inhibited by mutations in the p22phox-binding SH3 domains of organizers (p47phox or Noxo1). Plasma membrane targeting of Noxa1 depends on Noxo1 via tail-to-tail interactions. |
Cell transfection, dominant-negative Rac1 mutants, siRNA, Noxa1 Rac-binding mutants, fluorescence microscopy |
Molecular and cellular biology |
High |
16507994
|
| 2007 |
p22phox is required for glycosylation, structural maturation, and plasma membrane targeting of Nox3. p22phox co-precipitates with both Nox3 and NoxO1. RNAi-mediated reduction of p22phox decreased Nox3 activity. In vitro translation of Nox3 cDNA produced an ~50 kDa primary product that underwent N-linked glycosylation. The heme spectrum of Nox3 in plasma membrane is identical to that of Nox2. |
RNAi knockdown of p22phox, co-immunoprecipitation, in vitro transcription/translation with microsomal glycosylation assay, spectrophotometry, HEK-293 transfection |
The Biochemical journal |
High |
17140397
|
| 2005 |
NOXO1 splice forms differ in regulation of Nox3: NOXO1beta activates Nox3 effectively, whereas NOXO1gamma shows a significantly poorer ability to activate Nox3, despite both activating Nox1 and having similar lipid-binding properties of their PX domains. |
cDNA cloning of splice variants, Nox activity assay with co-transfection, PX domain lipid-binding assay |
Gene |
Medium |
15949904
|
| 2010 |
NOX3 siRNA knockdown in the rat cochlea (transtympanic delivery) prevented cisplatin-induced outer hair cell damage, reduced threshold shifts, reduced apoptosis (decreased Bax, restored Bcl2), and reduced expression of cochlear damage biomarkers TRPV1 and KIM-1, demonstrating that NOX3-derived ROS mediate cisplatin ototoxicity and initiate apoptotic signaling in the cochlea. |
In vivo siRNA knockdown, auditory brainstem response, scanning electron microscopy, immunohistochemistry, TUNEL assay, Western blot |
Antioxidants & redox signaling |
High |
20214492
|
| 2010 |
TRPV1 activation by capsaicin increases NOX3 NADPH oxidase activity and STAT1 activation in cochlear cells (UB/OC-1). In vivo, capsaicin-induced hearing loss was associated with STAT1 activation and inflammatory cell infiltration. STAT1 siRNA protected against capsaicin-induced hearing loss, placing NOX3 upstream of STAT1 in a TRPV1→NOX3→STAT1 inflammatory pathway. |
UB/OC-1 cell NOX3 activity assays, STAT1 reporter assay, in vivo capsaicin intratympanic injection, STAT1 siRNA knockdown, auditory brainstem response |
Antioxidants & redox signaling |
Medium |
20712533
|
| 2010 |
TNF-α activates NOX3 in HepG2 hepatocytes to generate ROS; NOX3 siRNA prevents TNF-α-induced decrease of cellular glycogen by blocking NOX3-dependent JNK activation, IRS1 inhibition, and reduction of AKT/GSK phosphorylation, placing NOX3 in a TNF-α→NOX3→ROS→JNK→insulin resistance signaling pathway in hepatocytes. |
siRNA knockdown of NOX3, glycogen assay, Western blot for JNK/IRS1/AKT/GSK phosphorylation, ROS measurement |
FEBS letters |
Medium |
20102709
|
| 2016 |
Adenosine A1 receptor (A1AR) agonist R-PIA suppresses cisplatin-induced NOX3 expression and ROS generation in the cochlea, reduces STAT1 phosphorylation at Ser727 (but not Tyr701) via inhibition of ERK1/2, p38, and JNK MAPK pathways, and decreases TNF-α, iNOS, and COX-2 expression, placing A1AR upstream of NOX3 in the cisplatin ototoxicity signaling cascade. |
In vivo transtympanic A1AR agonist administration, auditory brainstem response, scanning electron microscopy, STAT1 luciferase reporter assay, Western blot for phospho-STAT1/MAPK, UB/OC-1 cell culture |
The Journal of neuroscience |
Medium |
27053204
|
| 2016 |
NOX3 and NOX5 are required for ROS-mediated oligodendrocyte differentiation; selective depletion of NOX3 or NOX5 inhibits PMA-induced differentiation markers (Olig-2, MBP). NOX5 silencing downregulates NOX3 mRNA levels, suggesting NOX5-derived ROS upregulate NOX3 expression as part of a sequential ROS-generating network driving oligodendrocyte differentiation. |
siRNA knockdown of NOX3 and NOX5 in MO3-13 cells, Western blot for differentiation markers, ERK/CREB phosphorylation assays, PKC inhibition |
Frontiers in cellular neuroscience |
Medium |
27313511
|
| 2016 |
In lung endothelial cells, NOX3 expression is suppressed by a TLR4-Trif-STAT3 signaling axis, and Hsp70 acting via TLR4 suppresses Nox3. When this pathway is disrupted (TLR4 knockout), Nox3 is induced and drives increased oxidant injury and apoptosis. Endothelial-specific Nox3 silencing rescued the pro-oxidant phenotype of TLR4 knockout mice. |
Nox3-/-/TLR4-/- double knockout mice, endothelial-targeted lentiviral Nox3 silencing constructs, endothelial-targeted Stat3-/- mice, oxidant injury measurements |
Antioxidants & redox signaling |
Medium |
26905942
|
| 2006 |
NOX3 mediates insulin-induced VEGF-A expression in HepG2 cells. NOX3 siRNA knockdown abrogates insulin-stimulated H2O2 production, inhibits the second phase of p42/44 MAPK phosphorylation, reduces Sp1 DNA binding, and prevents VEGF-A mRNA upregulation, placing NOX3 in an insulin→NOX3→ROS→MAPK→Sp1→VEGF pathway. |
siRNA knockdown of NOX3, H2O2 measurement, MAPK phosphorylation Western blot, Sp1 EMSA, VEGF-A mRNA quantification |
Experimental cell research |
Medium |
16949073
|
| 2015 |
Nox3 mutant and heterozygous mice show greater susceptibility to noise-induced hearing loss specifically at 8 kHz, with damage localized to synaptic ribbons of the cochlea at that frequency, genetically linking Nox3 to tonotopic susceptibility to noise-induced cochlear damage. |
Mouse GWAS (HMDP), Nox3 mutant validation, DPOAE and ABR threshold measurements, histological analysis of synaptic ribbons |
PLoS genetics |
Medium |
25880434
|
| 2015 |
Nox3 is transiently induced by FGF2 and GDNF stimulation in spermatogonial stem cells (SSCs). ShRNA-mediated Nox3 inhibition reduced cytokine-induced ROS generation and decreased SSC numbers in culture and in freshly isolated testis cells, establishing Nox3 as a mediator of self-renewal factor-induced ROS generation required for SSC self-renewal. |
shRNA knockdown of Nox3, ROS measurement, SSC colony/transplantation assays, qRT-PCR |
Biology of reproduction |
Medium |
25947060
|
| 2019 |
A missense mutation in Nox3 (p.Asn64Tyr) in mice causes increased proliferation of cerebellar granule cell precursors associated with upregulation of SHH target genes Gli1-3 and CyclinD1, and elevated ROS production, placing Nox3 as a negative regulator of SHH pathway-driven neural progenitor proliferation in the cerebellum. |
Genetic mapping, cDNA microarray, ROS measurement, qRT-PCR of SHH targets in Nox3 mutant vs. wild-type cerebella |
Biochimica et biophysica acta. Molecular basis of disease |
Low |
30853403
|
| 2021 |
Using Nox3-Cre knock-in reporter mice, Nox3-expressing cells in the cochlea were identified as supporting cells, outer hair cells, inner hair cells, and spiral ganglion neurons. Nox3 expression increased with cisplatin, aging, and noise insults. Nox3 knockout mice showed reduced cisplatin-induced, age-related, and noise-induced hearing loss, with the greatest Nox3 contribution to cisplatin-induced hearing loss. |
Nox3-Cre;tdTomato knock-in reporter mice, Nox3-KO mice, ABR/DPOAE hearing assessment, immunofluorescence, cisplatin/noise/aging models |
The Journal of neuroscience |
High |
33849947
|
| 2021 |
Oc90 (otoconin-90) and Nox3 functionally cooperate in otoconia formation; double heterozygous Oc90/Nox3 mice show severe imbalance and otoconia defects, while single heterozygotes are normal. Co-expression of Oc90 and Nox3 in vitro produces markedly enhanced calcification compared to either protein alone. |
Double heterozygous and double null mutant mouse generation, vestibular behavioral and electrophysiological testing, morphological analysis, in vitro calcification assay in co-transfected cells |
Journal of vestibular research |
Medium |
33554930
|
| 2025 |
Nox3 is expressed in retinal ganglion cells (RGCs) and GABAergic amacrine cells (ACs) as determined by Nox3-Cre;tdTomato reporter mice. Nox3-KO mice show reduced ERG a-, b-, and STR-waves, indicating a functional role in retinal electrophysiology. Cisplatin reduced Nox3-expressing RGC/AC numbers in heterozygous but not full Nox3-KO mice, indicating Nox3-derived ROS mediate cisplatin retinal toxicity. |
Nox3-Cre;tdTomato knock-in reporter mice, Nox3-KO mice, electroretinography, cell counting, cisplatin treatment |
Cellular and molecular life sciences |
Medium |
41339603
|