Related Experiment Video
Updated: Aug 15, 2026
En Face Detection of Nitric Oxide and Superoxide in Endothelial Layer of Intact Arteries
Published on: February 25, 2016
Does expression of inducible nitric oxide synthase correlate with severity of oral epithelial dysplasia?
P A Brennan1, M Palacios-Callender, D Sinclair
1Queen Alexandra Hospital, Portsmouth, UK.
Abstract:
The small molecule nitric oxide (NO) has generated an exponential amount of research since its discovery as a biological messenger in 1987. It has a vast number of actions, many of which are poorly understood. It has been studied in a variety of human cancers and has been implicated both in tumour promotion and inhibition. Although NO is produced by three distinct isoforms of the enzyme nitric oxide synthase (NOS), most cancer research is directed towards the calcium-independent form, iNOS which following induction, produces much higher quantities of NO than the other two. In this study the expression of iNOS is assessed by immunohistochemistry in 26 cases of oral epithelial dysplasia ranging in severity from mild to severe. iNOS staining was found in all 26 cases of dysplasia with the degree of staining correlating to the severity of dysplasia (p < 0.001). There was no iNOS staining seen in adjacent normal epithelium. The possible role of iNOS in the complex transformation from dysplasia to invasive oral cancer and the clinical applications are discussed.
Insights
Inducible nitric oxide synthase (iNOS) expression increases with oral epithelial dysplasia severity. This finding suggests iNOS may play a role in oral cancer development, warranting further clinical investigation.
Area of Science:
- Biochemistry
- Oncology
- Molecular Biology
Background:
- Nitric oxide (NO) is a crucial biological messenger with diverse cellular functions.
- The enzyme nitric oxide synthase (NOS) produces NO, with the inducible isoform (iNOS) generating higher levels.
- iNOS's role in cancer is complex, implicated in both tumor promotion and inhibition.
Purpose of the Study:
- To investigate the expression of iNOS in oral epithelial dysplasia.
- To correlate iNOS expression levels with the severity of dysplasia.
- To explore the potential role of iNOS in oral carcinogenesis.
Main Methods:
- Immunohistochemistry was used to assess iNOS expression.
- The study analyzed 26 cases of oral epithelial dysplasia of varying severity.
- Adjacent normal oral epithelium served as a control.
Main Results:
- iNOS staining was detected in all 26 cases of oral epithelial dysplasia.
- A significant correlation was found between the degree of iNOS staining and the severity of dysplasia (p < 0.001).
- No iNOS staining was observed in adjacent normal epithelial tissues.
Conclusions:
- iNOS expression is upregulated in oral epithelial dysplasia and correlates with disease severity.
- These findings suggest iNOS may be involved in the progression of oral dysplasia to invasive oral cancer.
- Further research into the clinical applications of iNOS in oral cancer is warranted.
