Long-term effects of neonatal malnutrition on microbicide response, production of cytokines, and survival of macrophages infected by Staphylococcus aureus sensitive/resistant to methicillin
Keywords:
Macrophages, Malnutrition, Methicillin, StaphylococcusAbstract
Objective
To assess microbicide function and macrophage viability after in vitro cellular infection by methicillin-sensitive/resistant Staphylococcus aureus in nourished rats and rats subjected to neonatal malnutrition.
Methods
Male Wistar rats (n=40) were divided in two groups: Nourished (rats suckled by dams consuming a 17% casein diet) and Malnourished (rats suckled by dams consuming an 8% casein diet). Macrophages were recovered after tracheotomy, by bronchoalveolar lavage. After mononuclear cell isolation, four systems were established: negative control composed exclusively of phagocytes; positive control composed of macrophages pluslipopolysaccharide; and two testing systems, macrophages plus methicillin-sensitive Staphylococcus aureus and macrophages plus methicillin-resistant Staphylococcus aureus. The plates were incubated in a humid atmosphere at 37 degrees Celsius containing 5% CO2 for 24 hours. After this period tests the microbicidal
response, cytokine production, and cell viability were analyzed. The statistical analysis consisted of analysis of variance (p<0.05).
Results
Malnutrition reduced weight gain, rate of phagocytosis, production of superoxide anion and nitric oxide, and macrophage viability. Production of nitrite and interleukin 18, and viability of macrophages infected with methicillin-resistant Staphylococcus aureus were lower.
Conclusion
The neonatal malnutrition model compromised phagocyte function and reduced microbicidal response and cell viability. Interaction between malnutrition and the methicillin-resistant strain decreased the production of inflammatory mediators by effector cells of the immune response, which may compromise the immune system’s defense ability.
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