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Analysis of mitomycin C-induced micronuclei in lymphocytes from malnourished infected children
R Ortiz1, L Cortés, C González
1Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, México D.F., México.
Abstract:
The purpose of this study was to determine if peripheral blood lymphocytes from malnourished children with gastrointestinal or respiratory bacterial infection show increased frequencies of Mitomycin C (MMC)-induced micronuclei as compared to well-nourished, infected children. The results indicate that cells from malnourished, infected children had greater chromosome damage. This may indicate that such children would be more susceptible to environmental damage and malignant transformation. Micronucleus frequencies were analyzed in binucleate cells produced by the cytokinesis block method; the overall micronucleus frequency was significantly higher in binucleate cells from malnourished, infected children. The mean micronucleus frequency in MMC-free cultures was 4.3/1000 in malnourished infected children and 1.0/1000 in well-nourished infected children. In MMC-exposed cultures the mean induced micronucleus frequency was 32.6 +/- 6.1 vs. 12.9 +/- 2.3; 68.6 +/- 12.1 vs. 21.0 +/- 5.1, and 88.1 +/- 16.2 vs. 41.7 +/- 5.0 for malnourished and well-nourished children at 20, 40, and 60 ng/ml MMC, respectively. The number of binucleated cells with more than one micronucleus was also higher in malnourished, infected children at all doses tested, including cells with two micronuclei in MMC-free cultures from malnourished, infected children. This increase was not found in peripheral blood lymphocytes from well-nourished infected children.
Insights
Malnourished children with infections show significantly higher chromosome damage in lymphocytes. This increased susceptibility to DNA damage may heighten their risk of environmental harm and cancer development.
Area of Science:
- Immunology
- Genetics
- Pediatrics
Background:
- Malnutrition compromises immune function and increases susceptibility to infections.
- Infections can exacerbate cellular damage and genomic instability.
- Assessing lymphocyte DNA damage is crucial for understanding long-term health risks.
Purpose of the Study:
- To compare Mitomycin C (MMC)-induced micronucleus frequencies in lymphocytes of malnourished versus well-nourished infected children.
- To investigate if malnutrition amplifies chromosomal damage in children with bacterial infections.
- To assess the potential link between malnutrition, infection, and increased susceptibility to genotoxicity.
Main Methods:
- Peripheral blood lymphocytes were isolated from malnourished and well-nourished infected children.
- Cells were treated with varying concentrations of Mitomycin C (MMC).
- Micronucleus frequencies were analyzed in binucleate cells using the cytokinesis-block method.
Main Results:
- Malnourished, infected children exhibited significantly higher baseline and MMC-induced micronucleus frequencies compared to well-nourished controls.
- The number of binucleated cells with multiple micronuclei was elevated in the malnourished group across all MMC doses.
- Increased chromosome damage was evident even in MMC-free cultures from malnourished children.
Conclusions:
- Malnutrition exacerbates chromosome damage in lymphocytes of children with bacterial infections.
- These findings suggest malnourished children may have heightened susceptibility to environmental genotoxic agents.
- Increased genomic instability in malnourished, infected children could elevate their risk for malignant transformation.