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Serum complement levels in asymptomatic Plasmodium falciparum parasitaemic children
A B Umotong1, S D Amanor-Boadu, A A Okerengwo
1Chemical Pathology Department, University College Hospital, Ibadan, Nigeria.
Insights
In children with malaria, the fourth component of complement (C4) was consumed. Higher C4 levels in asymptomatic children suggest a protective role for C4 in malaria.
Area of Science:
- Immunology
- Infectious Diseases
- Pediatrics
Background:
- Malaria remains a significant global health challenge, particularly in pediatric populations.
- The host immune response, including the complement system, plays a crucial role in malaria pathogenesis and clinical presentation.
Purpose of the Study:
- To investigate the role of the complement system, specifically the fourth component (C4), in asymptomatic versus symptomatic pediatric malaria.
- To compare complement levels in malaria-infected children with healthy controls.
Main Methods:
- Blood samples were collected from 67 afebrile children undergoing elective surgery, with 28 found to have malaria parasitemia.
- Complement levels (C4, C3, Bf, CH50) were measured pre- and post-treatment in 15 infected children with parasite densities >= 500/microliter.
- Levels were compared to 15 age/sex-matched children with acute malaria and 15 healthy controls.
Main Results:
- Significant consumption of C4 was observed in both asymptomatic and symptomatic malaria patients.
- Mean serum C4 levels were significantly higher in asymptomatic children compared to symptomatic children (p < 0.01) and healthy controls (p < 0.05).
- Complement hemolytic titers mirrored C4 level distribution across groups.
Conclusions:
- The fourth component of the classical complement pathway (C4) may confer protection against severe malaria in children.
- C4 consumption indicates its activation and involvement in the immune response to malaria.
- Further research into complement-mediated protection could inform novel therapeutic strategies for malaria.
Abstract:
Twenty-eight (42%) of 67 afebrile children (mean age 6.3 +/- 3.6 years) undergoing various minor elective surgeries were slide positive for malaria parasitaemia. All infected subjects were given oral chloroquine therapy before and after blood samples were collected. Pre- and post-treatment complement (C4, C3, Bf and CH50 levels were evaluated in 15 of the subjects who had parasite densities > or = 500/microliter. These were compared with the levels in 15 age/sex-matched children who had acute malaria, as well as with the levels in 15 age/sex matched, non-infected controls. Significant consumption of C4 was observed in both the asymptomatic (p < 0.05) and symptomatic (p < 0.05) subjects. The mean serum levels of C4 were significantly higher in the asymptomatic, when compared with the symptomatic subjects (p < 0.01), and the healthy controls (p < 0.05). The distribution of classical pathway complement haemolytic titres in the groups studied was the same as that of the C4 levels. It is concluded that the forth component of the classical complement pathway may play a protective role in asymptomatic malaria.