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Malnutrition and impaired immune response to infection
Insights
Malnutrition impairs children's immune response, but recovery is possible after age one. Prenatal infections cause lasting immune issues, while elevated IgE in Protein-Energy Malnutrition (PEM) is linked to parasites and allergens, not T-cell dysfunction.
Area of Science:
- Immunology
- Pediatrics
- Nutrition Science
Background:
- Malnutrition in children is a complex cycle involving poverty, food scarcity, and infections, leading to immune response impairment.
- Prenatal infections contribute to growth retardation, altered immunoglobulin levels (IgG, IgM), and persistent immune depression.
- Protein-Energy Malnutrition (PEM) is associated with immune dysfunction, necessitating a deeper understanding of its contributing factors and reversibility.
Purpose of the Study:
- To investigate the factors contributing to immune response impairment in malnourished children.
- To determine the impact of prenatal infections on immune status in neonates.
- To elucidate the relationship between elevated Immunoglobulin E (IgE) levels in PEM, parasitic infestations, allergens, and T-cell function.
Main Methods:
- Analysis of the cycle of events leading to immune impairment in malnourished children.
- Evaluation of immune response recovery in children after age one.
- Assessment of immune markers (IgG, IgM) in neonates following prenatal infection.
- Utilizing passive cutaneous anaphylaxis measurements in baboon skin and specific IgE determinations.
Main Results:
- Immune suppression due to malnutrition can be significantly repaired if it occurs after one year of age.
- Prenatal infections result in growth retardation, increased maternal-to-foetal IgG ratios, elevated neonatal IgM, and sustained immune depression.
- Elevated IgE in PEM is primarily associated with parasitic infestations and common allergens, showing minimal correlation with decreased T-cell function.
Conclusions:
- The immune system's impairment in malnourished children is potentially reversible, particularly when malnutrition begins after infancy.
- Prenatal infections have profound and lasting negative effects on immune development and function.
- Allergens and parasitic infections, rather than T-cell dysfunction, are the main drivers of elevated IgE in Protein-Energy Malnutrition (PEM).
Abstract:
The cycle of events which leads to an impairment of the immune response in the malnourished child includes poverty, food deprivation and frequent infections. It is of great significance, however, that the marked suppression of the immune response can be repaired reasonably promptly, if the disease commences after the child has attained 1 year of age. Prenatal infection not only generates growth retardation but also a higher maternal to foetal IgG ratio, higher IgM in the neonate and a sustained immune depression. Passive cutaneous anaphylaxis measurements in the baboon skin and specific IgE determinations reveal that the elevated IgE in PEM is due to parasitic infestation and common allergens and has little or no relationship with decreased T-cell function.