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[Ultrastructure of pulmonary alveolar macrophages in peroral exposure to nitrosodimethylamine]
Abstract:
The data of electron microscopic studies of alveolar macrophages obtained by lung lavage in intact random bred white rats and in rats 3, 12 and 24 hours after a single intraperitoneal administration of nitrosodimethylamine (NDMA) at a toxic dose of 30 mg/kg are presented. It is shown that the activation of macrophages takes place within the first hours after exposure. Later such destructive effects as autolysis, fatty dystrophy, "dark" type destruction, nuclear fragmentation, etc., resulting in cellular death and disintegration can appear. The data obtained can serve the basis for the application of lung alveolar macrophages in estimating the harmful effect of different chemical environmental factors.
Insights
Nitrosodimethylamine (NDMA) exposure activates rat lung macrophages within hours, leading to cellular damage and death. This highlights macrophages
Area of Science:
- Toxicology
- Cell Biology
- Environmental Health
Background:
- Alveolar macrophages are critical immune cells in the lungs.
- Chemical environmental factors can impact lung health.
- Understanding cellular responses to toxins is vital for risk assessment.
Purpose of the Study:
- To investigate the ultrastructural changes in rat alveolar macrophages following nitrosodimethylamine (NDMA) exposure.
- To determine the temporal dynamics of macrophage response to NDMA.
- To assess the potential of alveolar macrophages as biomarkers for chemical toxicity.
Main Methods:
- Electron microscopic examination of alveolar macrophages.
- Macrophages were obtained from rats via lung lavage.
- Rats were administered a single intraperitoneal dose of NDMA (30 mg/kg).
- Samples were collected at 3, 12, and 24 hours post-exposure.
Main Results:
- Macrophage activation was observed within the initial hours after NDMA administration.
- Later time points revealed destructive cellular changes, including autolysis, fatty dystrophy, 'dark' type destruction, and nuclear fragmentation.
- These destructive effects ultimately led to cellular death and disintegration.
Conclusions:
- NDMA induces rapid activation followed by significant cellular damage in alveolar macrophages.
- Alveolar macrophages exhibit a time-dependent response to NDMA toxicity.
- These findings support the use of lung alveolar macrophages for evaluating the harmful effects of chemical environmental factors.