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Related Experiment Video

Updated: May 24, 2026

Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds

Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds

Published on: February 16, 2022

Nitric oxide signaling in hypoxia.

J J David Ho¹, H S Jeffrey Man, Philip A Marsden

¹Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada.

Journal of Molecular Medicine (Berlin, Germany)

|February 22, 2012

Summary

Hypoxia paradoxically decreases endothelial nitric oxide synthase (eNOS) expression and function. Novel research reveals complex oxygen (O2) and NO interactions crucial for O2 homeostasis and disease, involving hypoxia-inducible factor (HIF) pathways.

Area of Science:

Physiology
Biochemistry
Molecular Biology

Background:

Endothelial nitric oxide (NO) traditionally regulates vasomotor tone and O2 delivery.
Hypoxia initially showed a paradoxical decrease in endothelial nitric oxide synthase (eNOS) expression and function.
The intricate relationship between O2 and NO signaling is vital for understanding cellular O2 homeostasis and disease states.

Purpose of the Study:

To explore the complex functional interactions between O2 and NO.
To elucidate the mechanisms by which hypoxia influences NO production and signaling.
To investigate the role of these interactions in disease states associated with hypoxia.

Main Methods:

Examined the catalytic O2 requirements of NOS isoforms.
Investigated hypoxia-induced regulation of NOS mRNA and protein expression.

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Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds

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Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions

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Induction and Testing of Hypoxia in Cell Culture

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Published on: August 12, 2011

Analyzed intracellular O2-sensing pathways and their intersection with NO signaling networks, including hypoxia-inducible factor (HIF) pathways.

Main Results:

NOS isoforms require O2 for catalytic activity.
Hypoxia modulates NOS enzyme expression at both mRNA and protein levels.
O2-sensing pathways and NO signaling networks converge, with HIF stabilization influenced by O2-dependent prolyl hydroxylation and S-nitrosylation of pathway components.

Conclusions:

The interaction between O2 and NO is more complex than previously understood, impacting O2 delivery and utilization.
Hypoxia-inducible factor (HIF) stabilization involves both O2-dependent and NO-dependent pathways.
S-nitrosothiols may act as hypoxia-mimetics in various physiological and pathological conditions, highlighting a critical link between NO and O2 adaptation.