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[Dynamic studies on inhaled 15N-labelled nitrogen dioxide (15NO2)]
Sangyo Igaku. Japanese Journal of Industrial Health
|July 1, 1982
Summary
Inhaled nitrogen dioxide (NO2) is rapidly absorbed into the bloodstream and excreted in urine, as shown by a 15NO2 tracer study in rats. Higher NO2 exposure levels correlated with increased plasma nitrite.
Area of Science:
- Environmental Toxicology
- Biochemistry
- Mass Spectrometry
Context:
- Nitrogen dioxide (NO2) is a common air pollutant with known respiratory effects.
- Understanding the metabolic fate and distribution of inhaled NO2 is crucial for assessing its toxicological impact.
- Stable isotope tracing offers a precise method to track the dynamic pathway of pollutants in biological systems.
Purpose:
- To investigate the dynamic pathway and metabolic fate of inhaled nitrogen dioxide (NO2) in rats using a stable isotope tracer (15N).
- To quantify the distribution of 15N-labeled NO2 in various organs, blood, and urine following inhalation exposure.
- To determine the relationship between NO2 exposure concentration and plasma nitrite levels.
Summary:
- Rats exposed to 15NO2 showed higher 15N concentrations in urine, plasma, and kidneys, indicating rapid absorption into the blood and subsequent excretion.
- Lower 15N levels were observed in the liver, trachea, heart, and brain.
- Plasma nitrite levels increased with NO2 exposure concentration, particularly above 10 ppm, suggesting a dose-dependent formation of nitrite.
Impact:
- This study elucidates the rapid systemic absorption and excretion pathway of inhaled NO2.
- It provides evidence for the formation of plasma nitrite as a biomarker of NO2 exposure.
- Findings contribute to a better understanding of NO2 toxicology and risk assessment.