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Serum haemolytic classical and alternative pathways of complement in infancy: age-related changes
V P Ferriani1, J E Barbosa, I F de Carvalho
1Department of Paediatrics, Faculty of Medicine of Riberão Preto, University of São Paulo, Brazil.
Acta Paediatrica Scandinavica
|March 1, 1990
Summary
Complement
Area of Science:
- Immunology
- Pediatric Medicine
Background:
- The complement system is crucial for innate immunity.
- Understanding complement activity in infants is vital for assessing immune function.
Purpose of the Study:
- To evaluate the maturation of complement hemolytic activity in healthy children from birth to 2 years.
- To establish normal reference ranges for complement pathways in pediatric populations.
Main Methods:
- Kinetic method used to determine the time (t 1/2) for 50% red blood cell lysis.
- Assessed both classical and alternative complement pathways.
- Studied serum samples from healthy neonates and children aged 1-24 months.
Main Results:
- Lowest complement activity observed in neonates for both pathways.
- Classical pathway reached adult levels by 1-3 months; alternative pathway by 13 months.
- Classical pathway activity exceeded adult levels in children aged 7-24 months.
Conclusions:
- Complement pathways exhibit distinct maturation patterns in early childhood.
- Established normal t 1/2 ranges for pediatric complement activity.
- Provides essential reference data for pediatric immunology and clinical practice.