Increased protein nitrosylation in head and neck squamous cell carcinogenesis

¹Department of Otolaryngology-Head & Neck Surgery and the Robert H. Lurie Cancer Center, Northwestern University Medical School, Searle 12-561, 303 East Chicago Ave., Chicago, IL 60611-3008, USA.

|December 10, 1999

Summary

Nitrotyrosine, a marker of nitric oxide (NO) byproducts, increases in head and neck squamous cell carcinoma (HNSCCa). This suggests NO may play a role in HNSCCa development and immune suppression.

Area of Science:

Oncology
Biochemistry
Immunology

Background:

Nitric oxide (NO) and its metabolites are linked to cancer development.
Nitrotyrosine, a marker of protein nitrosylation by NO-species, is investigated in head and neck squamous cell carcinoma (HNSCCa).

Purpose of the Study:

To examine nitrotyrosine staining intensity as a marker of NO-species' activity during HNSCCa development.
To correlate nitrotyrosine levels with clinical data in HNSCCa progression.

Main Methods:

Immunohistochemical analysis of paraffin-embedded tissue samples from normal oral mucosa, hyperplasia/dysplasia, and HNSCCa.
Quantification of nitrotyrosine staining intensity using a specific monoclonal antibody.
Retrospective correlation with clinical data.

Main Results:

Significantly elevated nitrotyrosine staining was observed in reactive, dysplastic, and HNSCCa tissues compared to normal oral mucosa.
Distinct differences in staining intensity were noted across various upper aerodigestive tract primary sites.
Intense nitrotyrosine staining was also detected in individual inflammatory cells.

Conclusions:

Nitrotyrosine staining increases progressively from normal mucosa through reactive/dysplastic lesions to HNSCCa.
Inflammatory cell staining suggests a potential role for NO in mediating immunosuppression within the tumor microenvironment.
Further research is warranted to elucidate the role of NO in HNSCCa mutagenesis and immunosuppression.

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Increased protein nitrosylation in head and neck squamous cell carcinogenesis

Area of Science:

Background:

Purpose of the Study:

Main Methods:

Main Results:

Conclusions:

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