superoxide

Superoxide dismutase (SOD), an exclusive antioxidant enzyme, catalyzes the dismutation of the superoxide anion into oxygen and hydrogen peroxide, averting peroxynitrite formation and subsequent harm. It is extensively studied and utilized in various applications, including anti-inflammatory, antitumor, radiation protection, and antisenility [1].

Dihydroxyfumaric acid is a known generator of superoxide anions and by hydroxyl free radicals. Dihydroxyfumarate exposure can cause insulin inhibitory effects. It can spontaneously convert to hydroxypyruvate or to oxaloglycolate.

Matairesinol has radical and superoxide scavenging activities,; it also has anti-angiogenic activity by suppressing mROS signaling , can decrease hypoxia-inducible factor-1α± in hypoxic HeLa cells.

Phytic acid dodecasodium salt hydrate (myo-Inositol, hexakis(dihydrogen phosphate) dodecasodium salt hydrate) is a phosphorus storage compound of seeds and cereal grains. Phytic acid dodecasodium salt hydrate inhibits the enzymatic superoxide source xanthine oxidase with an IC50 of 6 mM and has antioxidative, neuroprotective, and anti-inflammatory effects.

Tempol (Tanol) is a superoxide scavenger. It has anti-inflammatory, neuroprotective and analgesic effects.

[Sar1, Ile8]-Angiotensin II acetate activates both the NADPH and NADH oxidases, and stimulates superoxide anion formation in vascular smooth muscle cells. [Sar1, Ile8]-Angiotensin II acetate has multiple effects on vascular smooth muscle, including contra

Aucuparin (2,6-dimethoxy-4-phenylphenol) is a plant antibiotic with anti-inflammatory activity. Aucuparin inhibited pulmonary fibrosis in mouse models induced by bleomycin (BLM). ABTS and FRAP showed clear scavenging activity. Aucuparin inhibited superoxide production of human neutrophils induced by fmlp, and its IC50 was 17.0μM.

H-PRO-HIS-CYS-LYS-ARG-MET-OH acetate acts as antioxidant by reacting with active oxygen species such as superoxide and hydroxyl radicals.

Antagonist of formyl peptide receptor 1 (FPR1). Reduces superoxide production induced by fMLF with an EC50 of 0.63 μM. Almost completely blocks fMLF-stimulated primary granule exocytosis.

Anemarrhenasaponin Ia ((2S,3R,4S,5S,6R)-2-{[(2R,3R,4S,5R,6R)-4,5-dihydroxy-2-{[(1R,3R,4R,7S,9S,12S,13S,16S,18R)-3-hydroxy-6-methoxy-7,9,13-trimethyl-6-(3-methylbutyl)-5-oxapentacyclo[10.8.0.02,?.0?,?.013,1?]icosan-16-yl]oxy}-6-(hydroxymethyl)oxan-3-yl]oxy}-6-(hydroxymethyl)oxan), an useful anti-inflammation reagent, is isolated from Anemarrhenae rhizome. Anemarrhenasaponin Ia inhibits the generation of N-formyl-methionyl-leucyl-phenylalanine (fMLP)-induced superoxide.

ALPHA-PINENE ((-)-Alpha-Pinene) is a bicyclic monoterpene found in pine trees and other plants, including Cannabis with diverse biological activities [1]. It reduces the growth of a panel of seven Gram-positive bacteria, seven Gram-negative bacteria, and eight yeast strains with MIC values of 0.75-1.29, 1.05-1.59, and 0.7-1.17%, respectively [2]. It has insecticidal activity against C. molestus larvae with LC50 values ranging from 47 to 49 mg/L.3 ALPHA-PINENE (100 μg/ml) induces apoptosis, increases anion superoxide production and DNA fragmentation, and activates caspase-3 in B16/F10 melanoma cells [4]. In a B16/F10 mouse xenograft model, ALPHA-PINENE(100 ml of a 10 mg/ml solution) reduces the number of metastatic lung nodules by approximately 7-fold. ALPHA-PINENE(8.6 mg/L, aerosol) also increases the time spent in the open arms of the elevated plus maze by approximately 2-fold in mice, indicating anxiolytic-like activity [5].

AD 0261 is a radical scavenger. It has a strong inhibitory action on the generation of lipid peroxides and superoxide anions.

BNTA is a potent extracellular matrix (ECM) modulator. In a rat model of arthritis, BNTA modulates arthritis by promoting the synthesis of cartilage structural molecules on chondrocytes through the induction of superoxide dismutase 3 (SOD3) and regulating chondrogenesis through superoxide anion elimination.

Isorhamnetin (3-methylquercetin) is the methylated metabolite of quercetin. Quercetin is an important dietary flavonoid with in vitro antioxidant activity. Isorhamnetin prevents endothelial cell injuries from oxidized LDL via inhibition of lectin-like ox-LDL receptor-1 upregulation, interference of ox-LDL-mediated intracellular signaling pathway (p38MAPK activation, NF-kappaB nuclear translocation, eNOS expression) and the antioxidant activity of isorhamnetin. Isorhamnetin prevents endothelial dysfunction, superoxide production, and overexpression of p47phox induced by angiotensin II. Isorhamnetin appears to be a potent drug against esophageal cancer due to it's in vitro potential to not only inhibit proliferation but also induce apoptosis of Eca-109 cells.

1. Loganic acid (Loganate) and geniposide exhibit both sides effect on superoxide generation.

ATN-224 (Bis(choline)tetrathiomolybdate) inhibits SOD1 activity in endothelial cells, an effect that is dose dependent with an IC50 of 17.5±3.7 nM. ATN-224 is an oral Cu2+/Zn2+-superoxide dismutase 1 (SOD1) inhibitor.

Mito-TEMPO is a mitochondria-targeted superoxide dismutase mimetic. Mito-TEMPO scavenges superoxide and alkyl radicals and prevents mitochondrial oxidation, necrosis and apoptosis.

MitoTEMPOL is a mitochondria-targeting superoxide dismutase mimetic that reduces mitochondrial O2- to H2O2. Like the related compound MitoTEMPO , MitoTEMPOL combines an antioxidant moiety (here, TEMPOL, also known as 4-hydroxy-TEMPO) with the lipophilic cation triphenylphosphonium, which allows it to pass through lipid bilayers and accumulate in mitochondria. MitoTEMPOL has been used to elucidate the role of mitochondria-derived superoxide in mitochondrial, cellular, and whole animal signaling.

PAR2 (1-6) amide is a synthetic peptide agonist of proteinase-activated receptor 2 (PAR2) that corresponds to residues 1-6 of the amino terminal tethered ligand sequence of human PAR2 and residues 37-42 of the full-length sequence.1It binds to NCTC 2544 cells expressing human PAR2 (Ki= 9.64 μM in a radioligand binding assay) and induces calcium mobilization in the same cells (EC50= 0.075 μM).2PAR2 (1-6) amide (100 μM) reduces colony formation of A549 lung cancer cells.1It induces superoxide production and degranulation in isolated human eosinophils when used at a concentration of 500 μM.3PAR2 (1-6) amide (5 μmol/kg) induces tear secretion in rats when used in combination with amastatin .4 1.Bohm, S.K., Kong, W., Bromme, D., et al.Molecular cloning, expression and potential functions of the human proteinase-activated receptor-2Biochem. J.314(Pt 3)1009-1016(1996) 2.Kanke, T., Ishiwata, H., Kabeya, M., et al.Binding of a highly potent protease-activated receptor-2 (PAR2) activating peptide, [3H]2-furoyl-LIGRL-NH2, to human PAR2Br. J. Pharmacol.145(2)255-263(2005) 3.Miike, S., McWilliam, A.S., and Kita, H.Trypsin induces activation and inflammatory mediator release from human eosinophils through protease-activated receptor-2J. Immunol.167(11)6615-6622(2001) 4.Nishikawa, H., Kawai, K., Tanaka, M., et al.Protease-activated receptor-2 (PAR-2)-related peptides induce tear secretion in rats: Involvement of PAR-2 and non-PAR-2 mechanismsJ. Pharmacol. Exp. Ther.312(2)324-331(2005)

Antitumor agent-89 (Compd OTS-5), a naturally occurring compound, exhibits weak inhibitory activity against fMLP-induced superoxide generation [1].

1-Oleoyl-2-palmitoyl-rac-glycerol (1,2-OP) is a diacylglycerol containing oleic acid at the sn-1 position and palmitic acid at the sn-2 position. It enhances the inhibition of superoxide anion production by cytochalasin B when used at a concentration of 10 μM. The concentration of 1,2-OP decreases from 25.7 to 11.15% during the dry-curing process of Iberian ham.

Antimycin A4 is an active component of the antimycin A antibiotic complex that is more polar than antimycin A1 , antimycin A2 , and antimycin A3 . Antimycin A4 inhibits ATP-citrate lyase with a Ki value of 64.8 μM. The antimycin A complex is a mixture of antimycins A1, A2, A3, and A4 that demonstrates antifungal, insecticidal, nematocidal, and piscicidal properties. It blocks mitochondrial respiration and can deplete cellular levels of ATP via inhibition of complex III of the mitochondrial electron transport chain (ETC). Antimycin A prevents the transfer of electrons between the b-cytochromes and ubiquinone at the Q(inner) site of complex III. This results in the stabilization of the ubisemiquinone radical at the Q(outer) site of complex III, leading to increased production of superoxide. Antimycin A is widely used in research to shunt electron flow through the ETC to study the chemical details of oxygen respiration. Additionally, antimycin A has been shown to inhibit Bcl-2 and Bcl-xL proteins, inducing apoptosis.

Leukotriene B4 (LTB4) is a dihydroxy fatty acid derived from arachidonic acid through the 5-LO pathway. It promotes a number of leukocyte functions including aggregation, stimulation of ion fluxes, enhancement of lysosomal enzyme release, superoxide anion production, chemotaxis, and chemokinesis. 12-oxo LTB4 is an initial metabolite of LTB4 formed via the LTB4 12-hydroxydehydrogenase pathway. It is rapidly converted to 10,11-dihydro-12-oxo-LTB4, followed by reduction of the 12-oxo group to give 10,11-dihydro-LTB4. 12-oxo-LTB4 (EC50 = 33 nM) is about 70-fold less potent than LTB4 (EC50 = 0.46 nM) at stimulating Ca2+ mobilization in human neutrophils. It is also significantly less potent than LTB4 at stimulating neutrophil migration with EC50 values of 170 and 2.7 nM for 12-oxo-LTB4 and LTB4, respectively.

CMB-087229 is an inhibitor of mutant superoxide dismutase 1 (SOD1) protein aggregation, exhibiting an IC50 of 67 nM, and holds potential for use in amyotrophic lateral sclerosis research [1].

Cistanoside F shows vasorelaxant, and antioxidative effects, it shows a strong free radical scavenging activity on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical and xanthine/xanthine oxidase (XOD) generated superoxide anion radical (O2-.).

N-Methylflindersine (2,2,6-Trimethyl-2H,5H-pyrano[3,2-c]quinolin-5-one) shows strong toxicity towards brine shrimp larvae, with an LD(50) value of 1.39 microg/ml. It also exhibits potent inhibition against N -formylmethionylleucylphenylalanine-induced superoxide production with IC(50) values less than 12 microM.

p-Benzoquinone is a superoxide scavenger. It is identified as a toxic metabolite in human blood.

4-Methyldaphnetin (DHMC) is a potent inhibitor (low micromolar) of lipid peroxidation and scavengers of superoxide anion radicals and of aqueous alkylperoxyl radicals, but may be pro-oxidant (enhancing generation of hydroxyl radicals) in the presence of free iron ions.2. 4-Methyldaphnetin(7,8-Dihydroxy-4-methylcoumarin) inhibits the proinflammatory 5-lipoxygenase enzyme at micromolar concentrations.

Taraxerone has allelopathic and antifungal effects.Taraxerone prevents catalase, superoxide dismutase, and reduces glutathione concentrations from the decrease induced by ethanol administration with the concentration dependent manner.

Avasopasem manganese is a drug candidate of superoxide dismutase mimetic.

3'-O-Methylmurraol may have potential anti-inflammatory activity, it exhibits inhibition (IC50 ≤ 7.31 ug/mL) of superoxide anion generation by human neutrophils in response to formyl-l-methionyl-l-leucyl-l-phenylalanine/cytochalasin B (fMLP/CB).

Chrysophanol 8-O-β-D-(6’-O-galloyl)glucopyranoside, a potent anthraquinone glucoside derived from Rheum undulatum L., exhibits significant DPPH radical and superoxide anion (?O2-) scavenging activity [1].

Diallyl tetrasulfide is an organosulfur compound that has been found in A. sativum and has diverse biological activities, including antimicrobial, antioxidant, and anticancer properties.[1],[2],[3],[4] It is active against the bacteria S. aureus and methicillin-resistant S. aureus (MRSA; MICs = 0.5 and 2 mg/L, respectively), as well as the fungi C. albicans, C. krusei, C. glabrata, A. niger, A. flavus, and A. fumigatus (MICs = 0.5, 4, 2, 1, 2, and 4 mg/L, respectively).[1] It reduces cadmium-induced increases in hepatic levels of thiobarbituric acid reactive substances (TBARS) and increases cadmium-induced decreases in the hepatic activity of superoxide dismutase (SOD1), catalase, GST, and glucose-6-phosphate dehydrogenase (G6PDH) in rats when administered at a dose of 40 mg/kg.[2] Diallyl tetrasulfide is cytotoxic to MCF-7 breast cancer cells (IC50 = 92 μM) and reduces tumor growth in a BGC-823 mouse xenograft model when administered at doses of 20, 30, and 40 mg/kg for 32 days.[3],[4]

Mulberroside F shows inhibitory effects on tyrosinase activity and on the melanin formation of melan-a cells, it also exhibits superoxide scavenging activity that is involved in the protection against auto-oxidation, suggests that mulberroside F may be us

Coronarin, A, B, C, and D are cytotoxic prinicples from the rhizomes of Hedychium coronarium, Zingiberaceae. Coronarin A exhibits good growth inhibition activities on HUVEC proliferation, it effectively suppresses the growth factor induced tube formation

Evofolin B is a natural compound isolated from the stem bark of Zanthoxylum ailanthoides. Evofolin B has an inhibitory effect on the superoxide anion produced by human neutrophils in response to formyl-L-methionine-L-leucine-L-phenylalanine/cytochalasin B (fMLP/CB).

Larixol acts as both an fMLP inhibitor and a modulator of various signaling pathways by inhibiting Src kinase, ERK1/2, p38, and AKT phosphorylation critical for immune responses. It disrupts the interaction between the βγ subunit of the Gi protein and downstream effectors linked to the fMLP receptor, thus abrogating fMLP-induced respiratory bursts. Additionally, larixol effectively reduces fMLP (0.1 μM)-triggered superoxide anion generation (IC50: 1.98 μM), cathepsin G secretion (IC50: 2.76 μM), and cellular chemotaxis, mitigating neutrophil hyperactivation and subsequent inflammation or tissue injury. Derivatives of larixol also demonstrate inhibitory activity on TRPC6 functional mutants associated with FSGS [1] [2].

BMX-001 is a third-generation, cationic, lipophilic, manganese (Mn), and porphyrin-based mimetic of the human mitochondrial manganese superoxide dismutase (MnSOD). It also has antioxidant and potential chemoprotective activities.

1. Swertianolin (Bellidifolin-8-O-Glucoside), mangiferin, rhodenthoside A-C, isoorientin, isovitexin, and amarogentin would serve as potential chemotaxonomic markers to differentiate Gentianaceae species. 2. Swertianolin and swertiamarin show significant hepatoprotective effect in the liver damage model induced by alpha-naphthylisot hiocyanate. 3. Swertianolin shows anti-acetylcholinesterase activity effects. 4. Swertianolin shows that it can scavenge superoxide and hydroxyl radicals with the studying method of the autoxidation of Pyrogallol and afenton.

Antioxidant agent-17 (compound 59) potently inhibits superoxide anion generation, exhibiting an IC50 value of 9.06 nM [1].

Tofersen (BIIB067) is an antisense oligonucleotide utilized to inhibit the synthesis of superoxide dismutase 1 (SOD1) protein by facilitating the degradation of SOD1 mRNA via the RNase H-dependent mechanism. This compound holds potential for amyotrophic lateral sclerosis (ALS) research.

Hispanone possesses anti-inflammatory activity, it shows inhibition of superoxide anion generation and elastase release.

Peroxynitrite is a highly reactive nitrogen species formed from the reaction of nitric oxide (NO) and superoxide.[1] FeTPPS is a ferric porphyrin complex that causes the decomposition of peroxynitrite by catalytic isomerization to produce nitrate both in vitro and in vivo. The conversion of this reactive nitrogen species to nitrate results in cytoprotection (EC50 = 5 µM). [2][3] FeTPPS does not complex with NO and does not alter superoxide directly. It is commonly used to elucidate the roles of peroxynitrite in oxidative stress, cell damage, and intracellular signaling. [4][5][6]

Lipoxin A4 methyl ester (LXA4 methyl ester) is a more lipid soluble, prodrug formulation of the transcellular metabolite LXA4. LXA4 is a trihydroxy fatty acid containing a conjugated tetraene, produced by the metabolism of 15-HETE or 15-HpETE with human leukocytes.[1] LXA4 is equipotent to leukotriene B4 (LTB4) in inducing superoxide generation in human neutrophils at 0.1 μM.[2] LXA4 is associated with several other biological functions including leukocyte activation, chemotaxis effects, natural killer cell inhibition, and monocyte migration and adhesion.[2],[3],[4]

Ochratoxin A-13C20is intended for use as an internal standard for the quantification of ochratoxin A by GC- or LC-MS. Ochratoxin A is a mycotoxin that has been found inAspergillusandPenicillium.1It increases lipid peroxide levels and the number of apoptotic cells, as well as reduces superoxide dismutase activity in rat kidney when administered at a dose of 120 μg/kg.2Topical application of ochratoxin A (80 μg/mouse) induces DNA damage, cell cycle arrest at the G0/G1phase, and apoptosis in mouse skin cells.1It also initiates tumor formation in a two-stage mouse skin tumorigenesis model. Ochratoxin A has been found as a contaminant in a variety of foods.3

Licorisoflavan A shows weak scavenging activity against superoxide anion radical, it and licoricidin have potential for the development of novel host-modulating strategies for the treatment of cytokine and/or MMP-mediated disorders such as periodontitis.L

Cyclomorusin exhibits competitive inhibition toward monophenolase activity of mushroom tyrosinase, the IC50 value of 0.092 microM. It evokes the stimulation of superoxide anion generation in fMLP-stimulated rat neutrophils. Cyclomorusin , neocyclomorusin

Mn(III)TMPyP is a manganese-porphyrin which acts as a superoxide dismutase (SOD) mimetic and peroxynitrite decomposition catalyst. SOD mimetics described to date are unstable and are capable of catalyzing undesired side-reactions in addition to the dismutation of the superoxide radical (O2-). Mn(III)TMPyP is an SOD mimetic with increased stability to pH and hydrogen peroxide. The rate constant for superoxide dismutation and peroxynitrite decomposition are 3.9 x 107 M-1s-1 and ~2 x 106 M-1s-1, respectively. Mn(III)TMPyP protected and enhanced the growth of SOD E. coli with a doubling time of 60 minutes (as compared to 240 minutes of the control) at 25 µM.

TriacetonaMine (Vincubine) protects the activitis of superoxide dismutase(SOD) and creatine phos-phate kinase (CPK); it also inhibits CaCl2 induced agglomeration of thromocyte. Triacetonamine can improve the constructile function of heart mus-cles of acute anemia and decrease the content of malodialdehyde (MDA) in the heart muscles.

Kinetin (N6-Furfuryladenine), a type of cytokinin, has plant growth regulation effects.