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The antimicrobial effects of nitric oxide: A narrative review
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DOI：10.1016/j.niox.2025.01.001.png)
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Abstract
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Nitric oxide (NO) is a versatile endogenous molecule with multiple physiological roles, including neurotransmission, vasodilation, and immune regulation. As part of the immune response, NO exerts antimicrobial effects by producing reactive nitrogen species (RNS). These RNS combat pathogens via mechanisms such as DNA deamination, S-nitrosylation of thiol groups, and lipid peroxidation, leading to disruptions in microbial cell membranes and vital protein functions. Due to these broad actions, NO targets many pathogens, including bacteria, fungi, and viruses, with minimal risk of resistance development. Given its potent antimicrobial properties, the therapeutic potential of exogenous NO has been recently studied. Various preparations, such as NO donors, inhaled gaseous NO, and topical preparations, have shown promising results in preclinical and clinical settings. This literature review examines the antimicrobial effects of exogenous NO reported in in vitro studies, animal models, and human clinical trials. We provide an overview of the mechanisms by which NO exerts its antimicrobial activity, highlighting its efficacy against diverse pathogens. By presenting the current findings, we aim to contribute to the growing body of evidence supporting the use of NO as a versatile antimicrobial agent in clinical practice.
Keywords:
Nitric oxide
Antimicrobial
Inhaled nitric oxide
Antiviral
COVID-19
Antifungal
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