{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T19:24:11Z","timestamp":1791228251704,"version":"4.1.0"},"reference-count":152,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2023,10,25]],"date-time":"2023-10-25T00:00:00Z","timestamp":1698192000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"\u201cRicerca Corrente\u201d funding scheme of the Ministry of Health, Italy"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cells"],"abstract":"<jats:p>Nitric oxide (NO) is a short-lived gas molecule which has been studied for its role as a signaling molecule in the vasculature and later, in a broader view, as a cellular messenger in many other biological processes such as immunity and inflammation, cell survival, apoptosis, and aging. Fractional exhaled nitric oxide (FeNO) is a convenient, easy-to-obtain, and non-invasive method for assessing active, mainly Th2-driven, airway inflammation, which is sensitive to treatment with standard anti-inflammatory therapy. Consequently, FeNO serves as a valued tool to aid the diagnosis and monitoring of several asthma phenotypes. More recently, FeNO has been evaluated in several other respiratory and\/or immunological conditions, including allergic rhinitis, chronic rhinosinusitis with\/without nasal polyps, atopic dermatitis, eosinophilic esophagitis, and food allergy. In this review, we aim to provide an extensive overview of the current state of knowledge about FeNO as a biomarker in type 2 inflammation, outlining past and recent data on the application of its measurement in patients affected by a broad variety of atopic\/allergic disorders.<\/jats:p>","DOI":"10.3390\/cells12212518","type":"journal-article","created":{"date-parts":[[2023,10,25]],"date-time":"2023-10-25T06:19:58Z","timestamp":1698214798000},"page":"2518","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":65,"title":["Exhaled Nitric Oxide as Biomarker of Type 2 Diseases"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6751-9921","authenticated-orcid":false,"given":"Mauro","family":"Maniscalco","sequence":"first","affiliation":[{"name":"Department of Clinical Medicine and Surgery, Federico II University, 80131 Naples, Italy"},{"name":"Istituti Clinici Scientifici Maugeri IRCCS, Pulmonary Rehabilitation Unit of Telese Terme Institute, 82037 Telese Terme, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1393-4473","authenticated-orcid":false,"given":"Salvatore","family":"Fuschillo","sequence":"additional","affiliation":[{"name":"Istituti Clinici Scientifici Maugeri IRCCS, Pulmonary Rehabilitation Unit of Telese Terme Institute, 82037 Telese Terme, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7599-5426","authenticated-orcid":false,"given":"Ilaria","family":"Mormile","sequence":"additional","affiliation":[{"name":"Department of Translational Medical Sciences, Federico II University, 80131 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aikaterini","family":"Detoraki","sequence":"additional","affiliation":[{"name":"Department of Translational Medical Sciences, Federico II University, 80131 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giovanni","family":"Sarnelli","sequence":"additional","affiliation":[{"name":"Department of Clinical Medicine and Surgery, Federico II University, 80131 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amato de","family":"Paulis","sequence":"additional","affiliation":[{"name":"Department of Translational Medical Sciences, Federico II University, 80131 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giuseppe","family":"Spadaro","sequence":"additional","affiliation":[{"name":"Department of Translational Medical Sciences, Federico II University, 80131 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7389-2033","authenticated-orcid":false,"given":"Elena","family":"Cantone","sequence":"additional","affiliation":[{"name":"Department of Neuroscience, Reproductive and Odontostomatological Sciences-ENT Section, University of Naples Federico II, 80131 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,10,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Kiss, H., Orlos, Z., Gellert, A., Megyesfalvi, Z., Mikaczo, A., Sarkozi, A., Vasko, A., Miklos, Z., and Horvath, I. 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