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Clastogenic effect of passive smoking on bone marrow polychromatic erythrocytes of NMRI mice
Abstract:
The genotoxic effect of passive inhalation of sidestream cigarette smoke on bone marrow polychromatic erythrocytes was studied using male NMRI mice. The animals were placed in individual 145.2-dm3 glass chambers resembling a room provided with normal air flow. They were exposed to the sidestream smoke of a commercial brand of cigarettes smoked by a smoking machine under standard conditions. Increased formation of micronuclei within polychromatic erythrocytes (PCEs) of femoral bone marrow 30 h after passive smoking was regarded as being due to the clastogenic effect of the smoke. Passive inhalation of the diluted sidestream smoke of a single cigarette resulted in a significant increase (P less than 0.01) in the frequency of micronucleated PCEs. This clastogenic activity was found to be dose-dependent.
Insights
Passive smoking, or secondhand smoke exposure, significantly increases micronuclei in mouse bone marrow cells. This genotoxic effect on polychromatic erythrocytes (PCEs) is dose-dependent, indicating smoke
Area of Science:
- Toxicology
- Genetics
- Environmental Health
Background:
- Secondhand smoke (SHS) is a known health hazard, but its specific genotoxic effects on bone marrow require further elucidation.
- Polychromatic erythrocytes (PCEs) in bone marrow are sensitive indicators of genotoxicity.
- Understanding the clastogenic potential of sidestream cigarette smoke is crucial for public health.
Purpose of the Study:
- To investigate the genotoxic impact of passive inhalation of sidestream cigarette smoke on bone marrow PCEs in mice.
- To determine if SHS exposure causes clastogenic effects, evidenced by micronucleus formation.
Main Methods:
- Male NMRI mice were exposed to diluted sidestream cigarette smoke in controlled glass chambers.
- Femoral bone marrow was analyzed 30 hours post-exposure for micronucleated PCEs.
- A smoking machine ensured standardized cigarette smoke generation and exposure conditions.
Main Results:
- A single cigarette's diluted sidestream smoke significantly increased the frequency of micronucleated PCEs (P < 0.01).
- The observed genotoxic effect was dose-dependent, with higher smoke concentrations leading to more micronuclei.
- This indicates a clastogenic effect of passive smoke inhalation on bone marrow cells.
Conclusions:
- Passive inhalation of sidestream cigarette smoke exhibits a dose-dependent genotoxic and clastogenic effect on mouse bone marrow.
- The study confirms the potential for SHS to damage genetic material in hematopoietic cells.
- Findings underscore the health risks associated with secondhand smoke exposure.