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Summary
Ingested asbestos fibers, including chrysotile and crocidolite, were found to penetrate the gastrointestinal tract and migrate systemically in baboons. This study used sensitive methods to demonstrate asbestos presence in multiple organs and blood.
Area of Science:
- Toxicology
- Gastroenterology
- Materials Science
Background:
- Previous studies suggested ingested asbestos fibers do not penetrate the baboon gastrointestinal tract.
- Concerns persist regarding the potential systemic effects of ingested asbestos materials.
Purpose of the Study:
- To investigate the gastrointestinal penetration and systemic migration of ingested chrysotile and crocidolite asbestos in baboons.
- To re-evaluate earlier conclusions using more sensitive analytical techniques.
Main Methods:
- Transmission electron microscopy (TEM) was employed for asbestos fiber identification.
- Tissue and blood samples from a test baboon gavaged with asbestos and a control baboon were analyzed.
Main Results:
- Significant levels of both chrysotile and crocidolite asbestos were recovered from the stomach, heart, spleen, pancreas, and blood of the test baboon.
- The findings contradict earlier conclusions regarding the impermeability of the baboon gastrointestinal tract to ingested asbestos.
Conclusions:
- Ingested asbestos fibers can penetrate the gastrointestinal tract of baboons.
- Systemic migration of asbestos fibers following ingestion is demonstrable with sensitive methodologies.