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Cytotoxic effects of macrophages and asbestos on transformed rat mesothelial cells
V A Furalev1, I V Kravchenko, L A Vasil'eva
1Laboratory of Natural Carcinogens, Institute of Carcinogenesis, N. N. Blokhin Cancer Research Center, Russian Academy of Medical Sciences, Moscow.
Abstract:
Asbestos produced a cytotoxic effect on transformed cells of rat pleural mesothelium and on IAR2 epithelial cells and Rat1 fibroblasts transformed by ras oncogene, but not on normal cells of these strains under conditions of coculturing with peritoneal macrophages. Contact of mesothelioma cells, but not macrophages with asbestos was necessary and sufficient for attaining the cytotoxic effect. Macrophage-conditioned medium potentiated asbestos cytotoxicity for transformed mesothelial cells, but not for IARS-ras and Rat1-ras.
Insights
Asbestos is cytotoxic to transformed rat cells, but not normal cells, when co-cultured with macrophages. Direct contact between asbestos and transformed mesothelioma cells is crucial for this cytotoxic effect.
Area of Science:
- Cell biology
- Toxicology
- Oncology
Background:
- Asbestos exposure is linked to mesothelioma and other cancers.
- The mechanisms underlying asbestos-induced cytotoxicity are not fully understood.
- The role of immune cells, such as macrophages, in asbestos toxicity requires further investigation.
Purpose of the Study:
- To investigate the cytotoxic effects of asbestos on normal and transformed rat cells.
- To determine the role of peritoneal macrophages in asbestos-induced cytotoxicity.
- To elucidate the specific cellular interactions required for asbestos to exert its toxic effects.
Main Methods:
- Co-culturing of asbestos with normal and transformed rat pleural mesothelial cells, IAR2 epithelial cells, and Rat1 fibroblasts in the presence of peritoneal macrophages.
- Investigating the necessity of direct contact between asbestos and target cells for cytotoxicity.
- Assessing the effect of macrophage-conditioned medium on asbestos cytotoxicity.
Main Results:
- Asbestos exhibited a cytotoxic effect on transformed mesothelial cells, IAR2 epithelial cells, and Rat1 fibroblasts, but not on their normal counterparts, when co-cultured with macrophages.
- Direct contact between asbestos and transformed mesothelioma cells, but not macrophages, was essential for the cytotoxic effect.
- Macrophage-conditioned medium enhanced asbestos cytotoxicity specifically for transformed mesothelial cells, but not for ras-transformed IAR2 or Rat1 cells.
Conclusions:
- Asbestos-induced cytotoxicity is specific to transformed cells and requires direct contact with these cells.
- Peritoneal macrophages play a role in mediating asbestos cytotoxicity, particularly towards transformed mesothelial cells.
- The findings suggest distinct mechanisms of asbestos toxicity depending on cell type and transformation status.