radicals

EUK-134, a synthetic superoxide dismutase (SOD)/catalase mimetic, exhibits potent antioxidant activities and inhibits the formation of β-amyloid and related amyloid fibrils.

Brusatol (NSC-172924) is a natural product isolated from the Brucea javanica plant. It inhibits Nrf2.

Tetrahydroxyquinone (Tetroquinone) is a molecule best known as a primitive anticataract drug, is also a highly redox active molecule that can take part in a redox cycle with semiquinone radicals, leading to the formation of reactive oxygen species (ROS).

Octocrylene (Octocrilene) is used as an ingredient in sunscreens and cosmetics. This organic compound can penetrate into the skin where it acts as a photosensitizer. This results in an increased production of free radicals under illumination.

Protocatechuic acid (3, 4-Dihydroxybenzoic acid) (3, 4-dihydroxybenzoic acid) is a natural phenolic compound found in many edible and medicinal plants. Recent studies indicate that it could be used as a protective agent against cardiovascular diseases and neoplasms. The mechanism of its action is mostly associated with antioxidant activity, including inhibition of generation as well as scavenging of free radicals and up-regulating enzymes which participate in their neutralization.

Uric acid is an important antioxidant that scavenges oxygen radicals and reactive oxygen species (such as singlet oxygen and peroxynitrite), inhibits lipid peroxidation, helps maintain stable blood pressure, and is the final product of purine metabolism. It is commonly used to induce hypertension models.

Broxyquinoline (5,7-Dibromo-8-hydroxyquinoline) is an antiprotozoal agent, and it can release oxygen free radicals from the water in mucous membranes.

Tinidazole (CP12574)a is a 5-nitroimidazole derivative with the antiprotozoal property. Although the mechanism of action has not been fully elucidated, it has been suggested that tinidazole is metabolized and yields nitrite anions and metronidazole. Metronidazole's nitro group, in turn, is reduced via the parasite ferredoxin, thereby generating a series of free nitro radicals including nitro anions. Toxicity is achieved via depletion of sulfhydryl groups and DNA strand breaks with multiple hits having an additive effect and ultimately leading to cell death.

L-Glutathione reduced (Glutathione) is a naturally occurring tripeptide found in cells as an endogenous antioxidant that scavenges oxygen free radicals. L-Glutathione reduced is a cofactor for certain enzymes and is involved in the rearrangement of protein disulfide bonds and the reduction of peroxides.

Erdosteine (RV 144) is a homocysteine-derived thiol derivative with mucolytic and free radical scavenging properties. Erdosteine and its metabolites modulate mucus production and viscosity, by which facilitating mucociliary transport and improving expectoration. This agent also suppresses the chemical-induced cough reflex as well as protects lung tissues from damages caused by cigarette smoking mediated through free radicals scavenging.

Procarbazine hydrochloride (NSC-77213 HCl) is the hydrochloride salt of a methylhydrazine derivative with antineoplastic and mutagenic activities. Although the exact mode of cytotoxicity has not been elucidated, procarbazine, after metabolic activation, appears to inhibit the trans-methylation of methionine into transfer RNA (t-RNA), thereby preventing protein synthesis and consequently DNA and RNA synthesis. This agent may also undergo auto-oxidation, resulting in the formation of cytotoxic free radicals which damage DNA through an alkylation reaction.

Rebamipide (OPC12759) is a quinolinone derivative with anti-ulcer and anti-inflammatory activities. Rebamipide induces cyclooxygenase 2 (COX2) synthesis which results in an increase in endogenous prostaglandin synthesis in the gastric mucosa. This agent also inhibits H. pylori-induced production of tumor necrosis factor (TNF) alpha and subsequent inflammation of the gastric mucosa. In addition, rebamipide scavenges oxygen-derived free radicals that potentially cause mucosal injury, and stimulates prostaglandin EP4 receptor gene expression followed by mucous secretion, thereby enhancing the gastric mucosal defense.

DMPO (5,5-Dimethyl-1-pyrroline N-oxide) is a kind of water-soluble nitric oxide spin trap, which allows the measurement of oxygen-centered free radicals in biological systems at room temperature using electron spin resonance. It has a high reaction rate constant for superoxide and hydroxyl radicals and distinguishes simultaneously among a variety of important biologically generated free radicals.

LAP is a highly efficient and biocompatible radical photoinitiator used to initiate radical chain polymerisation and synthesise polymeric materials under light irradiation. The primary wavelength for light absorption and polymerisation initiation is 405 nm. LAP concentrations ≥3.4 mmol/L and the radicals it generates exhibit cytotoxicity towards M-1 mouse renal collecting duct cells.

γ-Oryzanol (Gamma-Oryzanol) is a natural nutrient extract isolated from rice bran oil that contains a mixture of sterols and ferulic acids, which may aid in the destruction of free radicals in the skin. It has recently been researched for its ability to slow the progress of melanin pigmentation by intercepting the ultraviolet rays at the skin's surface and hindering their transmission.

D(+)-Galactosamine hydrochloride is a well-established experimental toxin that induces liver injury primarily by generating free radicals and depleting UTP nucleotides, and it can be used to establish lipopolysaccharide/D-Galactosamine-induced hepatitis or acute liver injury models.

Uric acid sodium is a potent and widely recognized antioxidant with the ability to scavenge oxygen free radicals, helping to maintain blood pressure stability and counteract oxidative stress. It effectively eliminates reactive oxygen species (ROS), such as singlet oxygen and peroxynitrite, and inhibits lipid peroxidation. Additionally, uric acid sodium is closely associated with the pathogenesis of gouty arthritis and the formation of calcium oxalate stones, and it can be used to induce hypertension models.

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.

1-Thioglycerol (alpha-Thioglycerol) is an antioxidant thioglycerol that scavenges free radicals and reduces oxidative stress as a media component, and is used as a matrix in fast atom bombardment mass spectrometry (FAB-MS) and liquid secondary ion mass spectrometry (LSIMS).

Pinosylvic acid is a Pinosylvin derivative, Pinosylvin can play an antioxidant role by scavenging free radicals, inhibiting protein kinase C and other mechanisms, and has a variety of biological functions such as antifungal, antibacterial, anticancer, anti-inflammatory, antioxidant, neuroprotective, antiallergic and so on.Pinosylvic acid is a competitive inhibitor of lunularic acid decarboxylase.

Broussochalcone A is a natural antioxidant and xanthine oxidase inhibitor (IC50 = 2.21 μM) that scavenges free radicals, inhibits iron-induced lipid peroxidation, and reduces nitric oxide synthesis in LPS-activated macrophages. Broussochalcone A induces apoptosis in human renal carcinoma cells by increasing ROS levels and activating the FOXO3 signaling pathway. Broussochalcone A is also a novel NR4A1 inhibitor that induces apoptosis in pancreatic cancer cells through NR4A1-dependent pathways.

Lophine (NSC-62790) can be used in the synthesis of protein kinase inhibitors, calcium antagonists, strong Chemicalbook cardiac agents, and antitumor drugs. Lophine derivatives act as in vitro chemiluminescent activators for the detection of free radicals.

α-Amylase-IN-1 is an α-Amylase inhibitor (IC50: 0.5509 μM). α-Amylase-IN-1 has antioxidant activity with an IC50 value of 53.49 μM for scavenging of DPPH free radicals, and can be used in the study of diabetes and oxidative stress-related diseases.

Ebselen (CCG-39161) is a organoselenium compound with anti-inflammatory, anti-oxidant and cytoprotective activity. Ebselen acts as a glutathione peroxidase mimetic and is thereby able to prevent cellular damage induced by reactive oxygen species (ROS). In addition, this agent inhibits the activity of a variety of enzymes including nitric oxide synthase (NOS), 5-lipoxygenase, cyclooxygenase, protein kinase C (PKC), NADPH oxidase and gastric H+/K+-ATPase. Furthermore, ebselen may be neuroprotective due to its ability to neutralize free radicals upon NMDA receptor activation thus, reducing lipoperoxidation mediated by glutamate-induced excitotoxicity.