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-14536
    Methylene Blue
    		Inhibitor
    Methylene blue (Basic Blue 9) 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 through the nitric oxide syntase/guanylate cyclase signalling pathway to reduce prepulse inhibition. Methylene blue is a REDOX cycling compound and able to cross the blood-brain barrier. Methylene blue is a Tau aggregation inhibitor. Methylene blue reduces cerebral edema, attenuated microglial activation and reduced neuroinflammation.
    Methylene Blue
  • HY-B2162
    Chondroitin sulfate
    		98.60%
    Chondroitin sulfate, one of five classes of glycosaminoglycans, has been widely used in the treatment of osteoarthritis. Chondroitin sulfate reduces inflammation mediators and the apoptotic process and is able to reduce protein production of inflammatory cytokines, iNOS and MMPs.
    Chondroitin sulfate
  • HY-B1041
    Aminoguanidine hydrochloride
    		Inhibitor ≥98.0%
    Aminoguanidine hydrochloride (Pimagedine hydrochloride) is an inhibitor of diamine oxidase and nitric oxide synthase. Aminoguanidine hydrochloride has a dose-dependent inhibitory effect on apoptosis induced by Doxorubicin (HY-15142). Aminoguanidine hydrochloride has antioxidant properties. Aminoguanidine hydrochloride can be used in diabetic nephropathy research.
    Aminoguanidine hydrochloride
  • HY-B1640
    Ethacrynic acid
    		Inhibitor 99.98%
    Ethacrynic acid has anti-inflammatory and anticancer activity. Ethacrynic acid is an orally active diuretic. Ethacrynic acid is an inhibitor of glutathione S-transferase (GSTs) and Wnt signaling pathways. Ethacrynic acid is a radiosensitizer. Ethacrynic acid can inhibit airway smooth muscle (ASM) contraction in mice. Ethacrynic acid can increase the outflow of aqueous humor from the eye for the study of glaucoma.
    Ethacrynic acid
  • HY-N2302
    Fucoxanthin
    		Inhibitor 98.99%
    Fucoxanthin (all-trans-Fucoxanthin) is a marine carotenoid and shows anti-obesity, anti-diabetic, anti-oxidant, anti-inflammatory and anticancer activities.
    Fucoxanthin
  • HY-18100A
    PRE-084 hydrochloride
    		Activator 99.92%
    PRE-084 hydrochloride is a highly selective σ1 receptor (S1R) agonist, with an IC50 of 44 nM. PRE-084 hydrochloride exhibits good neuroprotective effects, can improve motor function and motor neuron survival in mice. PRE-084 hydrochloride also can ameliorate myocardial ischemia-reperfusion injury in rats by activating the Akt-eNOS pathway.
    PRE-084 hydrochloride
  • HY-107383
    Tetrahydrobiopterin
    		99.72%
    Tetrahydrobiopterin ((Rac)-Sapropterin) is a cofactor of the aromatic amino acid hydroxylases enzymes and also acts as an essential cofactor for all nitric oxide synthase (NOS) isoforms.
    Tetrahydrobiopterin
  • HY-131166
    Curdlan
    		Activator 98.5%
    Curdlan is a polysaccharide found in bacteria, consisting of a glucose homopolymer with β-1,3-glycosidic linkages. Curdlan can be recognized by Dectin-1 (a C-type lectin receptor), inducing immune responses in tissue mast cells and enhancing dendritic cell effects in tumor immunity. Curdlan holds potential for research in cancer and immune-inflammatory diseases.
    Curdlan
  • HY-113216
    Asymmetric dimethylarginine
    		Inhibitor ≥98.0%
    Asymmetric dimethylarginine is an endogenous inhibitor of nitric oxide synthase (NOS), and functions as a marker of endothelial dysfunction in a number of pathological states.
    Asymmetric dimethylarginine
  • HY-100954
    2,4-Diamino-6-hydroxypyrimidine
    		Inhibitor 99.97%
    2,4-Diamino-6-hydroxypyrimidine is a specific GTP cyclohydrolase I inhibitor (the rate-limiting enzyme in de novo pterin synthesis). 2,4-Diamino-6-hydroxypyrimidine blocks Tetrahydrobiopterin (BH4) synthesis and suppresses NO production.
    2,4-Diamino-6-hydroxypyrimidine
  • HY-111914A
    Ferroheme
    		99.70%
    Ferroheme is the ferrous form of heme in hemoglobin, reversibly binding oxygen as an oxygen carrier. Its free form induces oxidative stress and ferroptosis by releasing iron ions, which catalyze reactive oxygen species generation via Fenton reactions, leading to lipid peroxidation and cell death. This mechanism is critical in pathological contexts like intracerebral hemorrhage and neurodegenerative diseases, making it a target for studying iron-overload disorders and ferroptosis-related pathologies[1][2][3].
    Ferroheme
  • HY-N0022
    Isoacteoside
    		Inhibitor 99.73%
    Isoacteoside is a natural product that can significantly inhibit the formation of glycation end products. Isoacteoside regulates the AKT/PI3K/m-TOR/NF-κB signaling pathway, induces apoptosis in OVCAR-3 cell. Isoacteoside exhibits antitumor, anti-inflammatory, anti-obesity and neuroprotective activities.
    Isoacteoside
  • HY-N0455A
    L-Arginine hydrochloride
    		Activator 99.95%
    L-Arginine ((S)-(+)-Arginine) is the substrate for the endothelial nitric oxide synthase (eNOS) to generate NO. L-Arginine is transported into vascular smooth muscle cells by the cationic amino acid transporter family of proteins where it is metabolized to nitric oxide (NO), polyamines, or L-proline. L-Arginine is a potent vasodilator, and can be used to induce experimental acute pancreatitis.
    L-Arginine hydrochloride
  • HY-18252
    Avanafil
    		Inhibitor 98.66%
    Avanafil (TA-1790) is a potent and selective phosphodiesterase-5 (PDE-5) inhibitor with IC50 values of 5.2 nM, 630 nM, 5700 nM, 6200 nM, 12000 nM, 27000 nM, 51000 nM and 53000 nM for PDE-5, PDE-6, PDE-4, PDE-10, PDE-8, PDE-7, PDE-2 and PDE-1, respectively. Avanafil activates NO/cGMP/PKG signaling-pathway to decrease loss in BMD, bone atrophy, and oxidative stress. Avanafil inhibits cyclic guanosine monophosphate (cGMP) hydrolysis and thus increases cGMP levels. Avanafil can be used for the research of erectile dysfunction and osteoporosis.
    Avanafil
  • HY-12116
    L-NIL
    		Inhibitor 99.82%
    L-NIL is an inducible NO synthase inhibitor, with an IC50 of 3.3 μM for miNOS.
    L-NIL
  • HY-113556
    Sappanone A
    		Inhibitor 99.87%
    Sappanone A is an orally active homoisoflavone found in sappan L. Sappanone A is a PDE4 and NF-κB inhibitor with anti-inflammatory and antioxidant effect. Sappanone A induces HO-1 expression through activation of Nrf2 pathway. Sappanone A also inhibits RANKL-induced osteoclastogenesis. Sappanone A has great potential in the research of inflammation-related and cardiovascular .
    Sappanone A
  • HY-N0823
    Lithospermic acid
    		Activator 99.56%
    Lithospermic acid ((+)-Lithospermic acid) is a plant-derived polycyclic phenolic carboxylic acid isolated from Salvia miltiorrhiza, and has the anti-oxidative and hepatoprotective activity on carbon tetrachloride (CCl4)-induced acute liver damage in vitro and in vivo.
    Lithospermic acid
  • HY-18734A
    Carboxy-PTIO potassium
    		Inhibitor 99.02%
    Carboxy-PTIO potassium is a potent nitric oxide (NO) scavenger that can make a quick reaction with NO to produce NO2. Carboxy-PTIO potassium can prevent hypotension and endotoxic shock through the direct scavenging action against NO in lipopolysaccharide-stimulated rat model.
    Carboxy-PTIO potassium
  • HY-W145521
    β-1,3-Glucan
    		Activator 98.18%
    β-1,3-Glucan (β Glucan) is an orally active polysaccharide composed of glucose polymers. β-1,3-Glucan increase the activity of IKKβ kinase, enhances the production of nitric oxide. β-1,3-Glucan improves resistance to Vibrio harveyi infection. β-1,3-Glucan enhances immune response, promotes blood pressure recovery, reduces lung, kidney and liver damage, inhibits the growth of syngeneic tumors.
    β-1,3-Glucan
  • HY-N0904
    Ginsenoside C-K
    		Inhibitor 99.92%
    Ginsenoside C-K, a bacterial metabolite of G-Rb1, exhibits anti-inflammatory effects by reducing iNOS and COX-2. Ginsenoside C-K exhibits an inhibition against the activity of CYP2C9 and CYP2A6 in human liver microsomes with IC50s of 32.0±3.6 μM and 63.6±4.2 μM, respectively.
    Ginsenoside C-K
Cat. No. Product Name / Synonyms Application Reactivity
NO Synthase Isoform Comparison

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