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Occupational exposure to formaldehyde and histopathological changes in the nasal mucosa
C Edling1, H Hellquist, L Odkvist
1Department of Occupational Medicine, University Hospital, Uppsala, Sweden.
Abstract:
To study the cytotoxic effect of formaldehyde on the human nasal mucosa 75 men with occupational exposure to formaldehyde or to formaldehyde and wood dust, were examined, looking particularly at early signs of irritative effects and histopathological changes in the nasal mucosa. All men underwent a medical examination and a nasal biopsy specimen was examined by a pathologist and graded from 0-8 according to the morphological changes. A high frequency of nasal symptoms, mostly a running nose and crusting, was related to exposure to formaldehyde. Only three men had a normal mucosa; the remainder had loss of cilia and goblet cell hyperplasia (11%) and squamous metaplasia (78%); in six cases (8%) there was a mild dysplasia. The histological grading showed a significantly higher score when compared with unexposed contents (2.9 v 1.8). There was no dose response relation, no malignancies, and no difference in the histological score between those exposed to formaldehyde or to formaldehyde and wood dust.
Insights
Occupational formaldehyde exposure significantly impacts nasal health, causing irritative symptoms and histopathological changes like squamous metaplasia in the nasal mucosa. These changes were observed even without a clear dose-response relationship.
Area of Science:
- Toxicology
- Occupational Health
- Histopathology
Background:
- Formaldehyde is a common occupational exposure agent.
- Its effects on human nasal mucosa require detailed investigation.
- Understanding early irritative and histopathological changes is crucial.
Purpose of the Study:
- To investigate the cytotoxic effects of formaldehyde on human nasal mucosa.
- To identify early signs of irritative effects and histopathological alterations.
- To correlate occupational exposure levels with observed nasal changes.
Main Methods:
- Medical examination and nasal biopsy of 75 men with occupational formaldehyde exposure.
- Histopathological examination and grading (0-8) of nasal mucosa by a pathologist.
- Comparison of morphological changes between exposed and unexposed individuals.
Main Results:
- High frequency of nasal symptoms (rhinorrhea, crusting) linked to formaldehyde exposure.
- Prevalence of histopathological changes: loss of cilia, goblet cell hyperplasia (11%), squamous metaplasia (78%), mild dysplasia (8%).
- Significantly higher histological grading scores in exposed individuals (2.9 vs. 1.8).
Conclusions:
- Occupational formaldehyde exposure induces significant histopathological changes in the nasal mucosa.
- Squamous metaplasia is a common finding in formaldehyde-exposed workers.
- No dose-response relationship or malignancies were detected; no difference between formaldehyde and formaldehyde/wood dust exposure groups.