Knockout Cell Series - Nitric Oxide Metabolic Pathway Knockout Cell Series - Nitric Oxide Metabolic Pathway

Nitric oxide (NO) is a key signaling molecule in the cardiovascular, nervous, and immune systems. Its bioavailability depends not only on synthesis rate but also on the metabolic balance between clearance and conversion. Dysregulated NO metabolism is closely associated with pulmonary hypertension, ischemia-reperfusion injury, atherosclerosis, and neurodegenerative diseases. Gene knockout cell models targeting key regulators of NO metabolism enable precise investigation of NO clearance mechanisms and provide reliable tools for therapeutic target validation and oxidative stress-related drug discovery.

Nitric oxide (NO) metabolic clearance is mainly regulated through three pathways controlling its bioavailability:
① reaction with superoxide (O₂⁻) to generate peroxynitrite (ONOO⁻), leading to protein nitration damage;
② binding of NO with oxyhemoglobin to produce nitrate (NO₃⁻) and methemoglobin;
③ degradation of S-nitrosothiols (SNO) by GSNOR.
Key regulatory factors include: SOD1/2, which eliminate O₂⁻ to protect NO bioavailability; GCH1, which synthesizes BH4 to maintain eNOS coupling; arginases (Arg1/2), which compete for the substrate L-arginine; GSNOR, which degrades SNO; and hemoglobin (HBB), which scavenges NO.

When dysregulated, SOD deficiency accelerates NO depletion, GCH1 insufficiency causes eNOS uncoupling (producing O₂⁻ instead of NO), Arg1/2 overexpression suppresses NO synthesis, and GSNOR imbalance disrupts nitrosylation homeostasis.

Corresponding gene knockout cell models provide clean genetic backgrounds for dissecting NO metabolic mechanisms and screening compounds that regulate NO half-life and redox balance, offering valuable tools for cardiovascular, neurological, and metabolic disease research.

Lundberg et al., Cell Metab, 2015

(Lundberg et al., Cell Metab, 2015)

The biological availability of nitric oxide (NO) depends not only on its synthesis but also on its metabolic fate through clearance and conversion pathways. Dysregulation of key metabolic regulators—including SOD, GCH1, arginases, GSNOR, and hemoglobin—can accelerate NO depletion or generate toxic metabolites, contributing to diseases such as pulmonary hypertension, ischemia-reperfusion injury, atherosclerosis, diabetic endothelial dysfunction, hemolysis-associated vasculopathy, asthma, cancer, and neurodegenerative disorders.

These disease associations highlight the therapeutic potential of targeting the NO metabolic pathway. Gene knockout cell models provide powerful tools for studying the regulatory functions of NO metabolic factors under pathological conditions and support mechanism studies, target validation, and drug discovery.

· Oxidative Stress and Cardiovascular Disease Models
Used to investigate the effects of SOD1/SOD2 knockout on superoxide accumulation and NO bioavailability, as well as to evaluate antioxidants or SOD mimetics.

· eNOS Coupling and Endothelial Dysfunction Models
Used to study BH4 deficiency and eNOS uncoupling caused by GCH1 knockout and to screen small molecules that restore eNOS function.

· Substrate Competition and Metabolic Disease Models
Used to investigate the effects of Arg1/Arg2 knockout on L-arginine metabolic flux and explore NO regulation in wound healing, tumor immunity, and metabolic syndrome.

· Nitrosylation Homeostasis and Signal Transduction Models
Used to study the impact of GSNOR knockout on the S-nitrosylated proteome and cellular signaling, providing screening platforms for GSNOR-targeting therapeutics in asthma, cancer, and related diseases.

EDITGENE’s NO metabolic pathway knockout cell line library focuses on key regulators involved in nitric oxide clearance and conversion. We provide validated gene knockout cell models for investigating oxidative stress, eNOS uncoupling, substrate competition, and nitrosylation imbalance-related disease mechanisms. Both ready-to-use and customized knockout cell services are available to support diverse research needs in redox biology and metabolism.

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