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Metsovo-tremolite asbestos fibres: in vitro effects on mutation, chromosome aberration, cell transformation and
K Athanasiou1, S H Constantopoulos, E Rivedal
1School of Education, Department of Elementary Studies, Aristotelian University of Thessaloniki, Greece.
Abstract:
Samples of Metsovo-tremolite asbestos, previously found to be the causative agent of endemic pleural calcification and an increased level of malignant pleural mesothelioma in a rural area of north-western Greece (Metsovo area), were tested in various in vitro toxicity test systems. It was found that asbestos fibres of this type were strong inducers of micronuclei and numerical chromosomal abnormalities while they induced low levels of chromosomal aberrations in mammalian cells in culture. Furthermore, this type of asbestos can induce a low level of in vitro transformation of Syrian hamster embryo cells. The fibres had no effect on gap-junctional cell-cell communication (followed by the dye-transfer method) and did not induce any mutations in the Salmonella typhimurium strain TA102 which is known to be sensitive to the action of various oxidative agents. These results support the hypothesis generated from studies on other types of asbestos that such fibres induce tumours by causing chromosomal mutations.
Insights
Metsovo-tremolite asbestos, linked to asbestos-related diseases in Greece, strongly induces chromosomal abnormalities in mammalian cells. This supports the theory that asbestos causes tumors through genetic damage.
Area of Science:
- Environmental Toxicology
- Occupational Health
- Cancer Research
Background:
- Metsovo-tremolite asbestos is associated with endemic pleural calcification and malignant pleural mesothelioma in northwestern Greece.
- Understanding the in vitro toxicity mechanisms of this specific asbestos type is crucial for public health risk assessment.
Purpose of the Study:
- To investigate the in vitro toxicity of Metsovo-tremolite asbestos.
- To elucidate the cellular mechanisms by which this asbestos may contribute to carcinogenesis.
Main Methods:
- In vitro assays using mammalian cells (micronuclei induction, chromosomal aberrations, cell transformation).
- Assays for gap-junctional cell-cell communication and mutagenicity in Salmonella typhimurium.
Main Results:
- Metsovo-tremolite asbestos strongly induced micronuclei and numerical chromosomal abnormalities.
- Low levels of chromosomal aberrations and in vitro cell transformation were observed.
- No effects on gap-junctional communication or mutagenicity in Salmonella typhimurium TA102 were detected.
Conclusions:
- Metsovo-tremolite asbestos exhibits genotoxic potential by inducing chromosomal damage in mammalian cells.
- Results support the hypothesis that asbestos-induced chromosomal mutations are a key mechanism in asbestos-related carcinogenesis.
- Further research into specific fiber properties and cellular responses is warranted.