3-Methylindole-induced nasal mucosal damage in mice
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1Department of Veterinary Pathology, Louisiana State University, Baton Rouge.
Abstract:
3-Methylindole (3MI) damages nasal olfactory epithelium in mice. Lesions were studied histologically from 30 minutes to 28 days after intraperitoneal injection of 400 mg 3MI/kg. Cellular swelling was apparent in olfactory epithelium by 6 hours after injection of 3MI, while respiratory epithelium was normal. Necrosis of olfactory epithelium and subepithelial glands was diffuse by 48 hours. Subsequent ulceration resulted in epithelial hyperplasia, squamous metaplasia, fibroplasia, and ossification. Partially occlusive intranasal fibrous and osseous tissue persisted through 28 days after 3MI injection.
Insights
3-Methylindole (3MI) causes significant damage to the nasal olfactory epithelium in mice. This chemical exposure leads to cellular swelling, necrosis, and persistent tissue changes over 28 days.
Area of Science:
- Toxicology
- Histopathology
- Otolaryngology
Background:
- 3-Methylindole (3MI) is a known toxicant.
- Olfactory epithelium damage can lead to sensory deficits.
Purpose of the Study:
- To investigate the temporal and histological effects of 3-Methylindole (3MI) on the nasal olfactory epithelium in a mouse model.
Main Methods:
- Mice were administered a single intraperitoneal injection of 400 mg/kg 3-Methylindole (3MI).
- Nasal tissues were collected and studied histologically at intervals from 30 minutes to 28 days post-injection.
Main Results:
- Early cellular swelling in olfactory epithelium observed by 6 hours post-injection.
- Diffuse necrosis of olfactory epithelium and subepithelial glands by 48 hours.
- Progressive ulceration, hyperplasia, squamous metaplasia, fibroplasia, and ossification occurred, with persistent fibrous and osseous tissue observed up to 28 days.
Conclusions:
- 3-Methylindole (3MI) induces severe, progressive, and potentially permanent damage to the nasal olfactory epithelium.
- The observed histopathological changes highlight the potent toxicity of 3MI to this specialized neuroepithelium.