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Morphological aspects of interactions between asbestos fibers and human mesothelial cell cytoskeleton
J R Rüttner1, A B Lang, D R Gut
1Institute of Pathology, University Hospital, Zurich, Switzerland.
Abstract:
The interaction of chrysotile and amphibole asbestos fibers with the cytoskeleton of cultured human mesothelial cells from nontumoral pleural effusions was studied using scanning electron and immunofluorescence microscopy. Asbestos-exposed mesothelial cells show a massive annular condensation of cytokeratin filaments, forming a concentric ring enveloping the nucleus and the phagocytosed asbestos fibers. By detergent extraction of the cells it could be shown that the asbestos fibers are in close contact with the nuclear membrane and associated with the cytoskeletal framework of the cells. An association of cytokeratin filaments with the asbestos could be observed during phagocytosis of the fibers. The disturbance of the cell cytoskeleton and the close morphologic contact between asbestos fibers and the nuclear membrane may have some relevance in explaining the well-recognized carcinogenic effects of asbestos mineral fibers.
Insights
Asbestos fibers like chrysotile and amphibole disrupt human mesothelial cell cytoskeletons, forming rings around nuclei. This interaction with the nuclear membrane may explain asbestos-induced cancer.
Area of Science:
- Cell Biology
- Toxicology
- Biophysics
Background:
- Asbestos exposure is linked to mesothelioma.
- The cellular mechanisms underlying asbestos carcinogenicity require further elucidation.
- Human mesothelial cells are the primary target cells for asbestos-related diseases.
Purpose of the Study:
- To investigate the interaction between asbestos fibers and the cytoskeleton of human mesothelial cells.
- To understand the morphological changes in mesothelial cells upon asbestos exposure.
- To explore the potential role of cytoskeletal disruption in asbestos-induced carcinogenesis.
Main Methods:
- Cultured human mesothelial cells from pleural effusions were exposed to chrysotile and amphibole asbestos fibers.
- Scanning electron microscopy (SEM) was used to visualize cell morphology.
- Immunofluorescence microscopy was employed to study the distribution of cytoskeletal proteins, specifically cytokeratin filaments.
Main Results:
- Asbestos-exposed cells exhibited a prominent annular condensation of cytokeratin filaments surrounding the nucleus and phagocytosed fibers.
- Detergent extraction revealed close contact between asbestos fibers and the nuclear membrane, integrated within the cytoskeletal framework.
- Cytokeratin filaments were observed to associate with asbestos fibers during the process of phagocytosis.
Conclusions:
- Asbestos fibers induce significant alterations in the mesothelial cell cytoskeleton, characterized by ring-like cytokeratin structures.
- The close association of asbestos fibers with the nuclear membrane and the cytoskeleton suggests a mechanism for cellular damage.
- These findings provide insights into the morphological basis for the carcinogenic potential of asbestos fibers.