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Serial study of the complement fractions C3, C4 and C3PA in allergic children
Insights
Complement system levels (C3, C4, C3PA) in children with asthma and urticaria showed no significant group differences. However, C4 elevations were common, and serial testing revealed significant individual variability, highlighting complement system instability.
Area of Science:
- Immunology
- Pediatric Allergy
- Clinical Chemistry
Background:
- The complement system plays a crucial role in immune responses.
- Understanding complement fraction levels in pediatric allergic conditions is important for diagnosis and management.
- Previous studies have explored complement levels in various diseases, but serial analysis in pediatric asthma and urticaria is less common.
Purpose of the Study:
- To investigate the levels of complement fractions C3, C4, and C3PA in children with atopic asthma, non-atopic asthma, and urticaria.
- To assess the stability and variability of these complement fractions through serial measurements.
- To determine if specific complement anomalies are associated with these pediatric conditions.
Main Methods:
- Radial immunodiffusion was used to quantify serum C3, C4, and C3PA levels.
- Measurements were taken serially over 45 days in 25 children (ages 4-9) with atopic asthma, non-atopic asthma, or urticaria.
- Data analysis focused on average levels, standard deviations, and individual variations exceeding two standard deviations.
Main Results:
- No significant differences were found in the average levels of C3, C4, and C3PA across the different pathological groups.
- Elevated C4 levels were the most frequent complement anomaly observed, particularly in atopic asthma (37.8%) and urticaria (33.3%).
- Serial testing revealed substantial inter-individual variability, with over 25% of assays showing variations exceeding two standard deviations for C3, C4, and C3PA.
Conclusions:
- While group averages of complement fractions C3, C4, and C3PA do not differ significantly in pediatric asthma and urticaria, individual variations are notable.
- The frequent observation of C4 elevation suggests a potential role in these conditions.
- The significant instability indicated by serial measurements underscores the importance of considering complement system dynamics in quantitative assays.
Abstract:
The C3, C4 and C3PA complement fractions were dosed by radial immunodiffusion in the serum of 25 children with ages from 4 to 9 years in a non symptomatic period comprehending 10 atopic asthmas (40,0% of the cases) 8 non atopic asthmas (32.0%) and 7 urticarias (28,0%). The quantitative dosage of the studied fractions was carried out in a serial form 7, 14, 30 and 45 days after the first determination, what made a total of 116 dosages of C3, 112 of C4 and 114 of C3PA. Globally, no differences were verified in the averages and standard deviations of the complement fractions studied in the various pathological situations considered. The complement anomaly more frequently observed was the C4 increase in 37,8% of the assays in patients with atopic asthma, 16,2% of the assays in patients with non-atopic asthma and in 33,3% of the assays in urticaria cases. The other complement fractions studied showed inconstant variations in some cases. The serial study demonstrated in the same patient, variations larger than 2 standard deviations in 25,8% of the assays for C3, 25,0% for C4 and 27,2% for C3PA, what may possibly indicate the great instability of the complement system which depends on a function, consumption or activation and synthesis relation, having to be taken into consideration in those assays comprehending the quantitative study of the seric complement fractions.