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Chronic long-term nitrate therapy: possible cytogenetic effect in humans?
M G Andreassi1, E Picano, S Del Ry
1CNR Institute of Clinical Physiology, via Moruzzi, 1, 56100, Pisa, Italy.
Mutagenesis
|October 30, 2001
Summary
Chronic nitrate therapy may increase genotoxicity, as indicated by higher micronucleated lymphocytes in treated patients. Further research is warranted to explore the link between nitrate therapy and genotoxicity.
Area of Science:
- Toxicology
- Genetics
- Cardiovascular Medicine
Background:
- Nitric oxide (NO) donors, like nitrates, have recognized genotoxic potential.
- Long-term nitrate therapy is common for ischemic conditions.
- Assessing the genotoxicity of chronic nitrate use is crucial for patient safety.
Purpose of the Study:
- To evaluate chromosomal damage in patients undergoing chronic nitrate therapy.
- To assess the genotoxic effects of nitric oxide (NO) in vitro.
- To determine if long-term nitrate treatment increases genotoxicity.
Main Methods:
- Chromosomal aberration analysis in lymphocytes of 27 ischemic patients on nitrate therapy vs. 18 controls.
- In vitro micronucleus induction and cell proliferation assays using sodium nitroprusside (SNP) on blood from 6 healthy donors.
- Evaluation of cytotoxicity and cell cycle delay in vitro.
Main Results:
- No significant difference in structural chromosomal aberrations between nitrate-treated patients and controls.
- Significantly higher frequency of micronucleated lymphocytes in the nitrate group (P=0.01).
- In vitro SNP treatment showed a dose-dependent increase in micronucleated lymphocytes, cytotoxicity, and cell cycle delay.
Conclusions:
- Nitrate therapy may possess genotoxic activity.
- The study suggests a potential link between chronic nitrate use and increased genotoxicity.
- Further investigation into nitrate therapy's genotoxicity is recommended.