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Inducible nitric oxide synthase expression in human urinary bladder cancer
H Wolf1, C Haeckel, A Roessner
1Institute of Pathology, University of Magdeburg, Germany. Hella.Wolf@medizin.uni-magdeburg.de
Virchows Archiv : an International Journal of Pathology
|February 24, 2001
Summary
Inducible nitric oxide synthase (iNOS) is present in all bladder tumors, but its expression varies greatly. Researchers could not link iNOS levels to tumor stage or grade, suggesting further investigation is needed.
Area of Science:
- Oncology
- Biochemistry
- Immunohistochemistry
Background:
- Nitric oxide (NO) is produced by nitric oxide synthases (NOS) in mammalian cells.
- The inducible NOS isoform (iNOS) is implicated in tumor biology, with potential dual roles as a tumor promoter and in anti-tumor activity.
Purpose of the Study:
- To investigate the cellular localization of iNOS in urinary bladder cancer tissue.
- To determine if iNOS expression correlates with tumor grade or stage in bladder cancer.
Main Methods:
- Immunohistological assessment of iNOS in 100 cases of urinary bladder cancer tissue.
- Comparison of iNOS staining in malignant and adjacent nonmalignant tissue.
Main Results:
- All tumor tissue samples showed positive iNOS immunostaining, while adjacent nonmalignant tissue did not.
- iNOS staining patterns within tumors were highly inhomogeneous, with variations in intensity and distribution.
- No clear correlation was found between iNOS expression and tumor grade or stage.
Conclusions:
- iNOS is universally present in bladder tumors but exhibits heterogeneous expression.
- Further research incorporating molecular genetics and diverse tumor markers is required to understand the functional relationship between NO and bladder cancer at different stages.