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Complement levels and leucocyte phagocytosis in newborn babies
O G Arinola1, K A Obisesan, K Afolabi
1Department of Chemical Pathology and Immunology, College of Medicine, University of Ibadan, Ibadan, Nigeria.
African Journal of Medicine and Medical Sciences
|July 21, 2004
Summary
Newborns have a higher infection risk than adults. This study reveals that gestational age and birth weight significantly impact infant immune responses, affecting T cells, B cells, and other immune markers.
Area of Science:
- Immunology
- Neonatal Health
- Infectious Disease Risk
Background:
- Newborn infants exhibit a heightened susceptibility to infections compared to adults.
- The precise immunological underpinnings of this vulnerability, especially concerning variations in gestational age and birth weight, remain incompletely understood.
Purpose of the Study:
- To investigate the influence of gestational age and birth weight on specific immune responses in newborns.
- To compare immune parameters between adults, full-term infants, low birth weight infants, and normal birth weight infants.
Main Methods:
- Enumeration of B-lymphocytes and T-lymphocytes using EAC-rosette and E-rosette assays, respectively.
- Assessment of leucocyte migration index (%M.I), candidacidal index (%C.I), and nitroblue tetrazolium (NBT) dye reduction.
- Quantification of serum complement components C3 and C5 via single radial immuno-diffusion.
Main Results:
- Low birth weight infants demonstrated the lowest levels of T cells, C3, C5, %NBT, and %C.I.
- Full-term infants showed the lowest percentage of B cells.
- Normal birth weight infants exhibited the least percentage migration index (%M.I).
Conclusions:
- Gestational age and birth weight are critical determinants of distinct aspects of the neonatal immune system.
- Immune function in newborns is significantly modulated by their developmental stage and weight at birth, influencing their infection risk.