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-169974
    SARS-CoV-2-IN-107
    		Inhibitor
    SARS-CoV-2-IN-107 (Compound A7) is the inhibitor for SARS-CoV-2 3CLpro with an IC50 of 261.3 nM. SARS-CoV-2-IN-107 inhibits the SARS-CoV-2 replication with an EC50 of 11.7 μM. SARS-CoV-2-IN-107 exhibits anti-inflammatory activity with a NO inhibition rate of 68.6% in LPS (HY-D1056)-stimulated RAW264.7 macrophages.
    SARS-CoV-2-IN-107
  • HY-130787
    Apterin
    		Inhibitor
    Apterin is a natural compound with anti-inflammatory activity. Apterin shows significantly inhibitory activity on NO production in RAW264.7 cells with an IC50 value of 41.8 μM.
    Apterin
  • HY-N13869
    Asperlin
    		Inhibitor
    Asperlin is an orally active marine-derived antibiotic with antifungal, anticancer, anti-inflammatory and anti-atherosclerotic activities. Asperlin induces apoptosis. Asperlin increases reactive oxygen species (ROS)- and DNA damage-associated G2/M phase arrest and ATM phosphorylation. Asperlin is effective in preventing HFD-induced obesity and modulating gut microbiota.
    Asperlin
  • HY-100954R
    2,4-Diamino-6-hydroxypyrimidine (Standard)
    		Inhibitor
    2,4-Diamino-6-hydroxypyrimidine (Standard) is the analytical standard of 2,4-Diamino-6-hydroxypyrimidine. This product is intended for research and analytical applications. 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 (Standard)
  • HY-122060
    BYK 191023
    		Inhibitor
    BYK 191023 is a selective and L-arginine competitive inducible nitric-oxide synthase inhibitor with an IC50 value of 86 nM, 17 µM, 162 µM for inducible (iNOS), neuronal (nNOS), and endothelial (eNOS) NO synthases respectively.
    BYK 191023
  • HY-17007R
    Saquinavir (Standard)
    		Inhibitor
    Saquinavir (Standard) (Ro 31-8959 (Standard)) is the analytical standard of Saquinavir (HY-17007). This product is intended for research and analytical applications. Saquinavir (Ro 31-8959) is an orally active HIV protease inhibitor that can be used in the research of AIDS. Saquinavir also has anti-inflammatory activity and can induce apoptosis of human red blood cells.
    Saquinavir (Standard)
  • HY-173388
    TLR4-IN-2
    		Inhibitor
    TLR4-IN-2 (Compound Racemic-11k) is inhibitors of TLR4, JNK, and NF-κB. TLR4-IN-2 inhibits NO production in LPS-stimulated RAW264.7 cells with an IC50 value of 23.2 µM. TLR4-IN-2 exerts anti-inflammatory activity by inhibiting TLR4 expression, reducing JNK phosphorylation, thereby suppressing the activation of NF-κB, blocking the transcription of inflammation-related genes, reducing the expression of iNOS and COX-2, and decreasing the production of inflammatory mediators such as NO, PGE 2, and TNF-α. TLR4-IN-2 is promising for research of inflammatory diseases, such as rheumatoid arthritis and various inflammatory disorders.
    TLR4-IN-2
  • HY-102015R
    6-Biopterin (Standard)
    6-Biopterin (Standard) is the analytical standard of 6-Biopterin. This product is intended for research and analytical applications. 6-Biopterin (L-Biopterin), a pterin derivative, is a NO synthase cofactor.
    6-Biopterin (Standard)
  • HY-18734AR
    Carboxy-PTIO potassium (Standard)
    		Inhibitor
    Carboxy-PTIO (potassium) (Standard) is the analytical standard of Carboxy-PTIO (potassium). This product is intended for research and analytical applications. 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 (Standard)
  • HY-N0022R
    Isoacteoside (Standard)
    		Inhibitor
    Isoacteoside (Standard) is the analytical standard of Isoacteoside. This product is intended for research and analytical applications. Isoacteoside is a natural product that can significantly inhibit the formation of glycation end products. Isoacteoside Standard regulates the AKT/PI3K/m-TOR/NF-κB signaling pathway, induces apoptosis in OVCAR-3 cell. Isoacteoside Standard exhibits antitumor, anti-inflammatory, anti-obesity and neuroprotective activities.
    Isoacteoside (Standard)
  • HY-N2794
    9-Hydroxy-α-lapachone
    		Inhibitor
    9-Hydroxy-α-lapachone (α-Dihydrocaryopterone) is a natural phenol, exhibits potent inhibitory effects with an IC50 of 4.64 µM on LPS-induced NO production in RAW 264.7 cells.
    9-Hydroxy-α-lapachone
  • HY-B1715R
    Oxiracetam (Standard)
    		Inhibitor
    Oxiracetam (Standard) is the analytical standard of Oxiracetam. This product is intended for research and analytical applications. Oxiracetam (ISF2522) is an orally active and a BBB-penetrable cyclic derivative of γ-aminobutyric acid (GABA). Oxiracetam reaches the hippocampus and cerebral cortex in high concentrations. Oxiracetam can promote cognitive function and regulate inflammatory response, with powerful neuroprotective effects. Oxiracetam can be used in the study of central nervous system diseases.
    Oxiracetam (Standard)
  • HY-N2192R
    Swertianolin (Standard)
    		Inhibitor
    Swertianolin (Standard) is the analytical standard of Swertianolin (HY-N2192). This product is intended for research and analytical applications. Swertianolin is a xanthone glycoside. Swertianolin can be isolated from plants of the Gentianaceae family (e.g., Gentiana campestris and Swertia punicea). Swertianolin inhibits p38 phosphorylation and NF-κB activation, and reduces NO and ROS production. Swertianolin exhibits anti-Helicobacter pylori activity with an IC50 of 6.1 μM and a minimum bactericidal concentration of 91.7 μM. Swertianolin modulates immune function in sepsis. Swertianolin is useful in the research of diseases such as Alzheimer's disease, hepatitis B, Helicobacter pylori infection, and sepsis.
    Swertianolin (Standard)
  • HY-D0145S
    7-Ethoxyresorufin-d5
    		Inhibitor
    7-Ethoxyresorufin-d5 is deuterium labeled 7-Ethoxyresorufin. 7-Ethoxyresorufin (Resorufin ethyl ether) is a fluorometric substrate and competitive inhibitor of cytochrome P450, especially CYP1A1. 7-Ethoxyresorufin also inhibits NO synthase.
    7-Ethoxyresorufin-d<sub>5</sub>
  • HY-102015S
    6-Biopterin-d3
    6-Biopterin-d3 (L-Biopterin-d3) is deuterium labeled 6-Biopterin. 6-Biopterin (L-Biopterin), a pterin derivative, is a NO synthase cofactor.
    6-Biopterin-d<sub>3</sub>
  • HY-N0823R
    Lithospermic acid (Standard)
    		Activator
    Lithospermic acid (Standard) is the analytical standard of Lithospermic acid. This product is intended for research and analytical applications. 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 (Standard)
  • HY-120865
    1,3-PBIT dihydrobromide
    		Inhibitor
    1,3-PBIT is a potent inhibitor of iNOS with a Ki of 47 nM compared to Ki values for eNOS and nNOS are 9 and 0.25 μM, respectively, for the purified human enzymes. Its inhibition in whole cells is greatly diminished, presumably to poor membrane permeability.
    1,3-PBIT dihydrobromide
  • HY-116582
    8-Nitroguanine
    8-Nitroguanine, a product of nitrative DNA damage caused by reactive nitrogen species, is a potential biomarker for progression of malignant fibrous histiocytoma.
    8-Nitroguanine
  • HY-B1179R
    Dipyrocetyl (Standard)
    Dipyrocetyl (Standard) is the analytical standard of Dipyrocetyl. This product is intended for research and analytical applications. Dipyrocetyl is an anti-inflammatory and analgesic agent extracted from patent WO 2011132171 A1.
    Dipyrocetyl (Standard)
  • HY-151241
    Sinomenine N-oxide
    		Inhibitor ≥99.0%
    Sinomenine N-oxide has anti-angiogenic, anti-inflammatory and anti-rheumatic effects. Sinomenine N-oxide is also a NO production inhibitor, with an IC50 value of 23.04 μM.
    Sinomenine N-oxide
Cat. No. Product Name / Synonyms Application Reactivity
NO Synthase Isoform Comparison

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