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[Dynamics of inherent interactions between the classical and alternative pathways of complement activation in
Insights
Premature infants with high alternative pathway complement activation are at increased risk for infections. Neonatal sepsis involves the classical pathway, while local purulent infections show varied complement pathway roles.
Area of Science:
- Immunology
- Neonatology
- Complement System
Background:
- The complement system is crucial for innate immunity in neonates.
- Premature infants are susceptible to infections due to immature immune systems.
- Understanding complement activation patterns can aid in predicting infectious risks.
Purpose of the Study:
- To investigate complement system activation pathways in premature infants with infections.
- To differentiate complement activation patterns in neonatal sepsis versus local purulent infections (LPI).
- To assess the prognostic value of complement activation for infectious risk in premature infants.
Main Methods:
- Examined 57 premature infants, including those with neonatal sepsis, LPI, and healthy controls.
- Assessed activation of the classical and alternative pathways of the complement system.
- Compared complement activation patterns between patient groups and controls.
Main Results:
- Patients showed early alternative pathway activation compared to controls.
- Neonatal sepsis was associated with increased classical pathway activation.
- LPI cases exhibited distinct classical and alternative pathway participation in anti-infectious defense.
Conclusions:
- High alternative pathway activation in premature infants indicates a risk for developing infections.
- Complement pathway activation patterns differ between neonatal sepsis and LPI.
- Alternative pathway activation serves as a prognostic marker for infectious risk in premature neonates.
Abstract:
Altogether 57 premature infants were examined. Of these, 15 presented with neonatal sepsis, 36 with local purulent infection (LPI) of different etiology, and 6 children were conventionally normal serving as control. Early activation of the alternative pathway of the complement system was shown by the patients as compared with control. The development of neonatal sepsis was attended by the increased role played by the classical pathway of complement activation. At the same time the course of LPI was characterized by differences in the degree of participation of the classical and alternative pathways in the antiinfectious defence of the neonates. It has been established that high activation of the alternative pathway seen in the premature children may be considered as a prognostic sign enabling one to classify them with the risk group in terms of the possibility of the development in them of an infectious process.