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-161612
    Mycosporine 2 glycine
    		Inhibitor
    Mycosporine 2 glycine is an anti-inflammatory agent and TYRP1 inhibitor. Mycosporine 2 glycine inhibits the expression of inflammatory genes and reduces nitric oxide production. Mycosporine 2 glycine binds tightly to the active pocket of TYRP1 and inhibits the activity of melanogenesis-related enzymes. Mycosporine 2 glycine can be used in the research of hyperpigmentation and inflammation-related diseases.
    Mycosporine 2 glycine
  • HY-N6966R
    Ethyl Caffeate (Standard)
    		Inhibitor
    Ethyl Caffeate is a natural phenolic compound isolated from Bidens pilosa. Ethyl caffeate suppresses NF-κB activation and its downstream inflammatory mediators, inducible nitric oxide synthase (iNOS), cyclooxygenase-2 (COX-2), and prostaglandin E2 (PGE2) in vitro or in mouse skin.
    Ethyl Caffeate (Standard)
  • 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-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-N0724R
    Mesaconitine (Standard)
    		Activator
    Mesaconitine (Standard) is the analytical standard of Mesaconitine. This product is intended for research and analytical applications. Mesaconitine is a nitric oxide synthase activator. Mesaconitine drives extracellular Na+ and Ca2+ influx into endothelial cells, increases intracellular Na+ and Ca2+ concentrations, and triggers nitric oxide release. Mesaconitine is applicable for pain-related research.
    Mesaconitine (Standard)
  • 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-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-N2106R
    Dehydroevodiamine (Standard)
    		Inhibitor
    Dehydroevodiamine is a major bioactive quinazoline alkaloid isolated from Evodiae Fructus, has an antiarrhythmic effect in guinea-pig ventricular myocytes. Dehydroevodiamine inhibits LPS-induced iNOS, COX-2, prostaglandin E2 (PGE2) and nuclear factor-kappa B (NF-κB) expression in murine macrophage cells.
    Dehydroevodiamine (Standard)
  • 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-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-100573R
    Necrosulfonamide (Standard)
    		Inhibitor
    Necrosulfonamide (Standard) is the analytical standard of Necrosulfonamide (HY-100573). This product is intended for research and analytical applications. Necrosulfonamide is a MLKL and Gasdermin D (GSDMD) inhibitor, capable of separately inhibiting necroptosis and pyroptosis of cells. Necrosulfonamide does not affect the activation of upstream signals, but specifically inhibits the downstream executor oligomerization step. Necrosulfonamide reduces the expression of the key kinases NLRP3 and caspase-1 involved in necroptosis and pyroptosis, activate the Nrf2 pathway and the downstream antioxidant enzymes, and also downregulates a variety of inflammatory factors. Necrosulfonamide plays significant roles in various diseases such as neurodegenerative diseases (such as Parkinson’s disease), tissue damage and ischemia-reperfusion injury, inflammatory bowel disease, osteoarthritis and fracture repair, and hair loss by regulating two important programmed necrosis pathways.
    Necrosulfonamide (Standard)
  • HY-120865
    1,3-PBIT dihydrobromide
    		Inhibitor 98%
    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-N0589R
    Dehydrodiisoeugenol (Standard)
    		Inhibitor
    Dehydrodiisoeugenol (Standard) is the analytical standard of Dehydrodiisoeugenol (HY-N0589). This product is intended for research and analytical applications. Dehydrodiisoeugenol is an orally active anti-inflammatory and anti-tumor agent. Dehydrodiisoeugenol inhibits the proliferation of colorectal cancer cells, and induces apoptosis, autophagy, endoplasmic reticulum stress and cell cycle arrest. Dehydrodiisoeugenol also exerts anti-inflammatory effects by inhibiting the activation of NF-κB and the expression of COX-2. Dehydrodiisoeugenol can be used in the research related to colorectal cancer, inflammatory diseases and ulcerative colitis.
    Dehydrodiisoeugenol (Standard)
Cat. No. Product Name / Synonyms Application Reactivity
NO Synthase Isoform Comparison

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