Knockout Cell Series - Nitric Oxide Biosynthesis Pathway Knockout Cell Series - Nitric Oxide Biosynthesis Pathway

Nitric oxide (NO) is a key signaling molecule involved in the cardiovascular, nervous, and immune systems, regulating vasodilation, neurotransmission, and inflammatory responses. Dysregulation of NO synthesis is closely associated with major diseases such as hypertension, atherosclerosis, neurodegenerative disorders, and sepsis. NO-related knockout cell lines provide powerful tools for dissecting the functional mechanisms of different nitric oxide synthase (NOS) isoforms and validating therapeutic targets. EDITGENE offers validated eNOS, iNOS, and nNOS knockout cell models to support scientific research and drug discovery.

Nitric oxide (NO) is synthesized from L-arginine by nitric oxide synthase (NOS), and its biosynthesis is tightly regulated at multiple levels. iNOS expression is controlled by transcription factors such as NF-κB. eNOS activity depends on activating phosphorylation at Ser1177 and inhibitory phosphorylation at Thr495, while palmitoylation is essential for its localization to plasma membrane caveolae. The availability of the substrate L-arginine and the cofactor BH4 determines whether eNOS produces NO or becomes “uncoupled” to generate superoxide.

NO primarily mediates vascular relaxation through activation of the sGC–cGMP signaling pathway and also participates in signal transduction through S-nitrosylation of protein thiol groups. Reduced eNOS activity contributes to hypertension and atherosclerosis, excessive iNOS activation drives inflammatory injury and septic shock, and abnormal nNOS signaling is implicated in neurodegenerative diseases.

Knockout cell models targeting eNOS, iNOS, and nNOS enable precise investigation of isoform-specific functions in disease and provide reliable tools for therapeutic target validation and drug development.

Farah et al., Nat. Rev. Cardiol., 2018

(Farah et al., Nat. Rev. Cardiol., 2018)

Nitric oxide synthases (NOS) and NO play essential roles in cardiovascular homeostasis, neurotransmission, immune responses, and metabolic regulation. Dysregulated expression or activity of key NOS isoforms (eNOS, iNOS, and nNOS) can increase oxidative stress, promote inflammatory signaling, and impair vasodilation, contributing to the development of numerous diseases, including hypertension, atherosclerosis, myocardial infarction, diabetic vascular complications, septic shock, Parkinson’s disease, Alzheimer’s disease, and neuropathic pain.

These disease associations highlight the significant therapeutic potential of targeting the NO biosynthesis pathway. Gene knockout cell models provide valuable tools for studying the regulatory functions of distinct NOS isoforms under pathological conditions and support mechanism studies, target validation, and drug discovery.

· Cardiovascular Disease Models
Used to investigate the effects of eNOS knockout on endothelium-dependent vasodilation, platelet aggregation, and blood pressure regulation, as well as for screening eNOS activators or BH4 supplementation therapies.

· Inflammation and Immune Disease Models
Used to study the impact of iNOS knockout on macrophage M1 polarization, elucidate mechanisms underlying LPS + IFN-γ-induced NO burst, and evaluate the anti-inflammatory activity of selective iNOS inhibitors.

· Neurodegenerative Disease Models
Used to investigate the role of nNOS knockout in glutamate excitotoxicity, synaptic plasticity, and cerebral ischemia-reperfusion injury, as well as for neuroprotective drug screening.

· Metabolic Disease Models
Used to study the effects of eNOS/iNOS double knockout on adipose tissue inflammation, insulin resistance, and energy metabolism, helping to clarify the role of NO in metabolic syndrome.

EDITGENE’s nitric oxide biosynthesis pathway knockout cell line library includes validated models targeting key regulators of NO production. We provide high-quality eNOS, iNOS, and nNOS knockout cell lines for research on vascular homeostasis, neuronal signaling, inflammatory immune responses, and NO-related disease pathways. In addition, both ready-to-use and custom knockout cell lines are available to support a wide range of cardiovascular, neurological, and immunological research applications.

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