2. Signaling Pathways
  3. Immunology/Inflammation
  4. NO Synthase

NO Synthase

Nitric oxide synthases; NOS

NO Synthase

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Nitric oxide synthases (NOSs) are a family of enzymes catalyzing the production of nitric oxide (NO) from L-arginine. NO synthases catalyze the oxidation of L-arginine to NO and L-citrulline. Mammals contain three NOS isoforms: neuronal NOS (nNOS), inducible NOS (iNOS), and endothelial NOS (eNOS). NO produced from these different NOS isoforms is involved in a wide range of physiologic functions in the nervous, immune, and cardiovascular systems. Unregulated NO production can lead to pathologic conditions such as stroke, inflammation, and hypertension. Therefore, the control of NOS activity by isoform selective NOS inhibitors has great potential for therapeutic treatments of NO-related diseases.

NO Synthase Isoform Specific Products:

NO Synthase Isoform Comparison
Cat. No. Product Name Effect Purity Chemical Structure
  • HY-102062
    Nω-Propyl-L-arginine
    		Inhibitor 98.62%
    Nω-Propyl-L-arginine (N-omega-Propyl-L-arginine) is a potent, competitive, and highly selective inhibitor of neuronal nitric oxide synthase (nNOS), with a Ki of 57 nM. Nω-Propyl-L-arginine displays a 149-fold selectivity for nNOS over endothelial NOS (eNOS).
    Nω-Propyl-L-arginine
  • HY-W040045
    Callistephin chloride
    		Inhibitor 98.02%
    Callistephin (Pelargonidin 3-O-glucoside) chloride is an anthocyanin. Callistephin chloride regulates the expression of inflammatory (reducing iNOS/TNF-α/COX-2) and apoptosis-related proteins by inhibiting p38 phosphorylation, and enhances the protective effect of Isoflurane (HY-A0134) on microglial cell damage. Callistephin chloride significantly reduces ROS levels, eliminates DPPH free radicals, protects retinal pigment epithelial cells, and inhibits lipid peroxidation. Callistephin chloride can alleviate glutamate excitotoxicity, reduce neuronal apoptosis, and protect cerebellar granule neurons. Callistephin chloride can inhibit the proliferation and metastasis of breast cancer cells by inducing apoptosis.
    Callistephin chloride
  • HY-W007539
    2,4-Dihydroxybenzaldehyde
    		Inhibitor 99.93%
    2,4-Dihydroxybenzaldehyde is an endogenous metabolite. 2,4-Dihydroxybenzaldehyde is a pharmaceutical intermediate that can be used to synthesize various Schiff base compounds. 2,4-Dihydroxybenzaldehyde exhibits significant anti angiogenic, anti-inflammatory, and analgesic activities. 2,4-Dihydroxybenzaldehyde reduces the production of NO and ROS by inhibiting the expression of iNOS and COX-2. 2,4-Dihydroxybenzaldehyde is commonly used in the study of inflammatory conditions.
    2,4-Dihydroxybenzaldehyde
  • HY-N2255
    Crebanine
    		Inhibitor 99.83%
    Crebanine is an isoquinoline-like alkaloid that can be derived from Stephania. Crebanine is an antagonist of the α7-nAChR with an IC50 of 19.1 μM. Crebanine suppresses the proliferation, migration, and invasion of cancer cells, triggers reactive oxygen species (ROS) burst, and promotes apoptosis. Crebanine inhibits the AKT/FoxO3a, NF-κB and MAPK signaling pathways. Crebanine attenuates NOX2 hyperactivation, exhibits antioxidant properties by reducing reactive oxygen species and peroxidation. Crebanine inhibits voltage-dependent Na+ current in guinea-pig ventricular myocytes. Crebanine has high inhibitory activity against gram-positive animal pathogenic bacteria. Crebanine ameliorates ischemia-reperfusion brain damage in middle cerebral artery occlusion and reperfusion (MCAO/R) rats. Crebanine significantly improves Scopolamine (HY-N0296)-induced cognitive deficits in ICR mice. Crebanine can be used for the study of hepatocellular carcinoma (HCC), cerebral ischemia and Alzheimer's disease.
    Crebanine
  • HY-D0958
    Methylene blue hydrate
    		Inhibitor
    Methylene blue (Basic Blue 9) hydrate is a guanylyl cyclase (sGC), monoamine oxidase A (MAO-A) and NO synthase (NOS) inhibitor. Methylene blue is a vasopressor and is often used as a dye in several medical procedures. Methylene blue hydrate through the nitric oxide syntase/guanylate cyclase signalling pathway to reduce prepulse inhibition. Methylene blue hydrate is a REDOX cycling compound and able to cross the blood-brain barrier. Methylene blue hydrate is a Tau aggregation inhibitor. Methylene blue hydrate reduces cerebral edema, attenuated microglial activation and reduced neuroinflammation.
    Methylene blue hydrate
  • HY-19504
    AVE3085
    		Activator 99.95%
    AVE3085 is a potent endothelial nitric oxide synthase enhancer, used for cardiovascular disease treatment.
    AVE3085
  • HY-18399
    YM-1
    		99.25%
    YM-1 is a stable MKT-077 (HY-15096) analog and an orally active Hsp70 inhibitor. YM-1 induces cell death of HeLa cells and up-regulates the level of p53 and p21 proteins.
    YM-1
  • HY-N2180
    Pinoresinol dimethyl ether
    		Inhibitor 99.39%
    Pinoresinol dimethyl ether ((+)-Eudesmin) is a non-phenolic furanoid lignin. Pinoresinol dimethyl ether can be isolated from Magnolia biondii. Pinoresinol dimethyl ether activates MAPK, PKC, and PKA upstream pathways and inhibits NO levels. Pinoresinol dimethyl ether has neuroprotective activity.
    Pinoresinol dimethyl ether
  • HY-129138
    Cyanidin 3,5-diglucoside chloride
    		Inhibitor 99.37%
    Cyanidin 3,5-diglucoside chloride is an anthocyanin. Cyanidin 3,5-diglucoside chloride inhibits inflammatory cytokines (IL-1α, IL-1β, and IL-6) expression and NO production. Cyanidin 3,5-diglucoside chloride inhibits the phosphorylation of STAT3, IκB, ERK, p38, and AKT. Cyanidin 3,5-diglucoside chloride inhibits high pressure-induced decrease in GLAST. Cyanidin 3,5-diglucoside chloride exerts anti-inflammatory and skin barrier modulating effects. Cyanidin 3,5-diglucoside chloride can be used in retinal research.
    Cyanidin 3,5-diglucoside chloride
  • HY-119720
    Neocryptotanshinone
    		Inhibitor 98.82%
    Neocryptotanshinone, a fatty diterpenoids from Salvia Miltiorrhiza, inhibits lipopolysaccharide-induced inflammation by suppression of NF-κB and iNOS signaling pathways.
    Neocryptotanshinone
  • HY-N6029
    Dehydroevodiamine hydrochloride
    		99.93%
    Dehydroevodiamine hydrochloride is isolated from the leaves of Evodia rutaecarpa.
    Dehydroevodiamine hydrochloride
  • HY-N2237
    Piceatannol 3'-O-glucoside
    		Activator 99.87%
    Piceatannol 3'-O-glucoside, an active component of Rhubarb, activates endothelial nitric oxide (NO) synthase through inhibition of arginase activity with IC50s of 11.22 μM and 11.06 μM against arginase I and arginase II, respectively.
    Piceatannol 3'-O-glucoside
  • HY-N8307
    Syringaresinol
    		Activator 99.15%
    Syringaresinol is a lignan that can be extracted from the dragon's blood of the Dracaena tree. Syringaresinol increases NO production by increasing the phosphorylation and dimerization of endothelial NO synthase, exerting a vasodilatory effect. Syringaresinol also inhibits the NF-κB pathway, exerting anti-inflammatory activity and inhibiting arthritis.
    Syringaresinol
  • HY-125740
    Malvidin-3-glucoside chloride
    		Inhibitor 99.87%
    Malvidin-3-glucoside (Malvidin-3-O-glucoside; Oenin) chloride is an orally active inhibitor of the NF-κB pathway, which blocks inflammatory responses induced by TNF-α, reduces IκB-α degradation and p65 nuclear translocation, and upregulates endothelial nitric oxide synthase eNOS to increase NO production. Malvidin-3-glucoside chloride exerts anti-inflammatory and antioxidant effects by inhibiting pro-inflammatory molecules such as MCP-1, ICAM-1, and IL-6, and regulating intestinal microorganisms and metabolites, while protecting endothelial cells and improving intestinal microecological dysbiosis under inflammatory conditions. Malvidin-3-glucoside chloride can be used to study chronic inflammatory-related diseases such as atherosclerosis and inflammatory bowel disease, and has the potential to prevent vascular inflammation and improve intestinal health.
    Malvidin-3-glucoside chloride
  • HY-111804
    3',4'-Dihydroxyflavonol
    		Activator 99.33%
    3',4'-Dihydroxyflavonol (DiOHF) is an effective antioxidant, which reduces superoxide and improves nitric oxide (NO) function in diabetic rat mesenteric arteries.
    3',4'-Dihydroxyflavonol
  • HY-N0455AS7
    L-Arginine-13C hydrochloride
    		Activator 99.7%
    L-Arginine-13C (hydrochloride) is the 13C-labeled L-Arginine hydrochloride. L-Arginine hydrochloride ((S)-(+)-Arginine hydrochloride) is the nitrogen donor for synthesis of nitric oxide, a potent vasodilator that is deficient during times of sickle cell crisis.
    L-Arginine-<sup>13</sup>C hydrochloride
  • HY-N1860
    3-O-Methylquercetin
    		Inhibitor 99.98%
    3-O-Methylquercetin is an inhibitor of cAMP and CGMP-phosphodiesterase (PDE) with IC50 at 13.8 μM and 14.3 μM, respectively. 3-O-Methylquercetin is an inhibitor of β-secretase with an IC50 of 6.5 μM. 3-O-Methylquercetin has a neuroprotective effect against neuronal death caused by oxidative damage. 3-O-Methylquercetin has strong antiviral activity against poliovirus, coxsackie virus and human rhinovirus. 3-O-Methylquercetin has anti-inflammatory and trachea-relaxing effects and can be used in the study of inflammatory diseases and asthma.
    3-O-Methylquercetin
  • HY-N0455AS
    L-Arginine-15N2 hydrochloride
    		Activator ≥98.0%
    L-Arginine-15N2 (hydrochloride) is the 15N-labeled L-Arginine (hydrochloride). L-Arginine hydrochloride ((S)-(+)-Arginine hydrochloride) is the nitrogen donor for synthesis of nitric oxide, a potent vasodilator that is deficient during times of sickle cell crisis.
    L-Arginine-<sup>15</sup>N<sub>2</sub> hydrochloride
  • HY-W003969
    Aminopicoline
    		Inhibitor 99.99%
    Aminopicoline (Ascensil) is a potent and nonselective inhibitor of NO synthase (NOS) isoenzymes (iNOS, nNOS, eNOS).
    Aminopicoline
  • HY-N7931
    Regaloside A
    		Inhibitor 99.64%
    Regaloside A, a phenylpropanoid, shows significant DPPH radical scavenging activity of 58.0% at 160 ppm. Regaloside A has anti-inflammatory activity.
    Regaloside A
Cat. No. Product Name / Synonyms Application Reactivity
NO Synthase Isoform Comparison

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