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A Neonatal Imaging Model of Gram-Negative Bacterial Sepsis
Published on: August 12, 2020
Staphylococcus epidermidis biofilms induce lower complement activation in neonates as compared with adults
Hildegunn N Granslo1, Claus Klingenberg, Elizabeth A Fredheim
1Department of Clinical Medicine, Pediatric Research Group, Faculty of Health Sciences, University of Tromsø, Tromsø, Norway. hildegunn.granslo@uit.no
Pediatric Research
|December 13, 2012
Summary
Neonatal complement activation is deficient against Staphylococcus epidermidis (SE) biofilms. This maturational gap may impair infant immunity to SE sepsis, highlighting a critical vulnerability in newborns.
Area of Science:
- Immunology
- Neonatal Medicine
- Microbiology
Background:
- Staphylococcus epidermidis (SE) causes late-onset neonatal sepsis, often via polysaccharide intercellular adhesin (PIA) biofilms.
- Neonatal immune responses to SE biofilm infections are poorly understood.
- SE biofilms may induce lower complement activation in neonates compared to adults.
Purpose of the Study:
- To investigate differences in complement activation between neonatal and adult immune responses to SE biofilms.
- To assess the role of PIA in SE biofilm-associated complement activation in neonates versus adults.
Main Methods:
- An ex vivo whole-blood model using cord blood from term infants and adult blood.
- Comparison of a PIA-producing SE strain (SE1457) and its non-PIA mutant (M10).
- Measurement of complement activation, antibody levels, and cytokine (IL-8, IL-6) secretion.
Main Results:
- SE biofilms induced significantly lower complement activation in cord blood than in adult blood.
- Cord blood had lower antibody levels against PIA and SE compared to adult blood.
- Neonatal blood showed higher secretion of IL-8 and IL-6, while PIA biofilms enhanced complement activation more than non-PIA biofilms.
Conclusions:
- The neonatal complement system demonstrates a maturational deficiency.
- This deficiency may compromise the ability of neonates to fight biofilm-associated SE infections.
- Further research into neonatal immune defenses against SE is warranted.
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