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

NO Synthase

Nitric oxide synthases; NOS

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.

Cat. No. Product Name Effect Purity
  • HY-13683
    Inhibitor 99.77%
    Mifepristone (RU486) is a progesterone receptor (PR) and glucocorticoid receptor (GR) antagonist with IC50s of 0.2 nM and 2.6 nM in in vitro assay.
  • HY-18729A
    L-NAME hydrochloride
    Inhibitor 99.70%
    L-NAME hydrochloride inhibits NOS with an IC50 of 70 μM. L-NAME is a precursor to NOS inhibitor L-NOARG which has an IC50 value of 1.4 μM.
  • HY-10230
    Activator 99.95%
    Midostaurin (PKC412; CGP 41251) is an orally active, reversible multi-targeted protein kinase inhibitor. Midostaurin inhibits PKCα/β/γ, Syk, Flk-1, Akt, PKA, c-Kit, c-Fgr, c-Src, FLT3, PDFRβ and VEGFR1/2 with IC50s ranging from 22-500 nM. Midostaurin also upregulates endothelial nitric oxide synthase (eNOS) gene expression. Midostaurin shows powerful anticancer effects.
  • HY-N0455
    Activator ≥98.0%
    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.
  • HY-121526
    Agonist 98.53%
    S-Nitroso-N-acetyl-DL-penicillamine (SNAP) is a nitric oxide donor and acts as a stable inhibitor of platelet aggregation.
  • HY-147306A
    Inhibitor ≥98.0%
    (S)-ZLc002 is a S-enantiomer of ZLc-002. ZLc-002 is a selective inhibitor of nNOS-Capon coupling. ZLc-002 suppresses inflammatory nociception and chemotherapy-induced neuropathic pain.
  • HY-137957
    Longiferone B
    Longiferone B is a daucane sesquiterpene, that can be isolated from Boesenbergia longiflora rhizomes. Longiferone B shows anti-inflammatory activity against NO release with an IC50 of 21.0 μM. Longiferone B also suppresses the iNOS and COX-2 mRNA expression.
  • HY-N0278
    Anemonin (Pulsatilla camphor), a selective iNOS inhibitor, is also a PKC-θ inhibitor. Anemonin can significantly inhibit the translation or protein stability of PKC-θ protein. Anemonin also ameliorates dextran sodium sulfate-induced acute ulcerative colitis (UC) in mice. Anemonin can be used in the research of inflammation-related diseases.
  • HY-18732A
    L-NMMA acetate
    Inhibitor 98.58%
    L-NMMA acetate is a nitric oxide synthase inhibitor of all NOS isoforms including NOS1, NOS2, and NOS3. The Ki values for nNOS (rat), eNOS (human), and iNOS (mouse) are approximately 0.18, 0.4, and 6 µM, respectively.
  • HY-18731
    1400W Dihydrochloride
    Inhibitor 99.94%
    1400W dihydrochloride is a potent and selective inhibitor of human inducible NO synthase with Ki values of 7 nM.
  • HY-N1445
    Inhibitor 99.87%
    Isoquercetin (Quercetin 3-glucoside) is a naturally occurring polyphenol that has antioxidant, anti-proliferative, and anti-inflammatory properties. Isoquercetin alleviates ethanol-induced hepatotoxicity, oxidative stress, and inflammatory responses via the Nrf2/ARE antioxidant signaling pathway. Isoquercetin regulates the expression of nitric oxide synthase 2 (NO2) via modulating the nuclear factor-κB (NF-κB) transcription regulation system. Isoquercetin has high bioavailability and low toxicity, is a promising candidate agent to prevent birth defects in diabetic pregnancies.
  • HY-14536
    Methylene Blue
    Inhibitor 98.08%
    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.
  • HY-18100A
    PRE-084 hydrochloride
    Activator 99.79%
    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.
  • HY-136278
    DETA NONOate
    Activator ≥98.0%
    DETA NONOate (NOC 18) is an exogenous nitric oxide (NO) donor. DETA NONOate shows a slow release normal amounts of NO and long-acting.
  • HY-107383
    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.
  • HY-100954
    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.
  • HY-B2162
    Chondroitin sulfate
    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.
  • HY-12116
    Inhibitor 99.20%
    L-NIL is an inducible NO synthase inhibitor, with an IC50 of 3.3 μM for miNOS.
  • HY-N0455A
    L-Arginine hydrochloride
    Activator ≥98.0%
    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.
  • HY-B1041
    Aminoguanidine hydrochloride
    Inhibitor ≥98.0%
    Aminoguanidine hydrochloride is a diamine oxidase and NO synthase inhibitor, reduces levels of advanced glycation end products (AGEs) through interacting with 3-deoxyglucosone, is an investigational drug for the treatment of diabetic nephropathy.
Cat. No. Product Name / Synonyms Application Reactivity