Chromium content of normal and pathologically altered lung tissue

Area of Science:

• Environmental Health
• Toxicology
• Pulmonary Medicine

Background:

• Chromium (Cr) exposure is a concern in occupational and environmental settings.
• Understanding chromium accumulation in lung tissue is crucial for assessing health risks.
• Previous research on chromium levels in non-occupationally exposed populations is limited.

Purpose of the Study:

• To quantify chromium content in autopsy samples of lungs, bronchi, and hilar lymph nodes.
• To investigate the relationship between chromium levels and demographic factors (age, location) and lung conditions (anthracosis, scarring, smoking).
• To evaluate the association between chromium levels and the presence of primary lung carcinomas.

Main Methods:

• Flameless atomic absorption spectrophotometry was employed for chromium determination.
• Autopsy samples from 50 randomly selected patients (urban and rural) were analyzed.
• Cr concentration was measured in lung parenchyma, bronchial walls, and hilar lymph nodes.

Main Results:

• Average Cr concentration in lungs increased with age, ranging from ~2 μg/g in younger patients to 5-15 μg/g dry weight in older individuals.
• Higher Cr levels were observed in lung apices, and correlated with age and degree of anthracosis.
• Scarred lung tissue showed significantly elevated Cr levels (up to tenfold), possibly due to lymphatic blockade. Smokers' lungs had slightly elevated Cr. Cr levels in lung carcinomas were lower than surrounding tissue.

Conclusions:

• Chromium accumulation in lung and bronchial tissue appears to be age- and anthracosis-dependent.
• Elevated chromium in scarred lung tissue suggests impaired lymphatic clearance.
• The study found no evidence linking chromium levels in lung or bronchial tissue to the induction of bronchial carcinoma.