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Influence of recombinant human erythropoietin on neutrophil function in premature neonates
V Soubasi1, E Roilides, C Tsantali
1Department of Neonatology, Aristotle University of Thessaloniki, Hippokration Hospital, Thessaloniki, Greece.
Insights
Recombinant human erythropoietin (rhEPO) combined with standard iron levels may slightly reduce neutrophil phagocytosis in preterm infants. Higher iron levels alongside rhEPO did not show this impairment, suggesting iron availability is key.
Area of Science:
- Neonatal immunology
- Hematology
- Pharmacology
Background:
- Preterm infants often require interventions like erythropoietin and iron supplementation.
- Neutrophil function is crucial for fighting infections in neonates.
- The combined effects of erythropoietin and iron on neutrophil function require further investigation.
Purpose of the Study:
- To assess the in vivo impact of recombinant human erythropoietin (rhEPO) and varying iron doses on neutrophil antimicrobial function in preterm infants.
- To compare neonatal neutrophil function with that of healthy adults.
Main Methods:
- A randomized trial involving 21 preterm infants receiving rhEPO with high-dose iron, rhEPO with standard-dose iron, or standard-dose iron alone.
- Isolation and functional assessment of neutrophils (PMNs) from infants and healthy adults.
- Evaluation of PMN migration, chemotaxis, superoxide anion production, and Staphylococcus aureus phagocytosis.
Main Results:
- No significant differences were observed in neutrophil random migration, chemotaxis, superoxide production, or phagocytosis between preterm infants and healthy adults.
- Phagocytosis of Staphylococcus aureus by neutrophils was significantly lower in the rhEPO + standard iron group compared to both the rhEPO + high iron and standard iron only groups.
- This impairment was linked to rhEPO administration alongside standard iron levels.
Conclusions:
- Neonatal neutrophil antimicrobial functions (migration, chemotaxis, superoxide production, phagocytosis) are comparable to adult levels.
- Combined administration of rhEPO and standard iron may modestly impair neonatal neutrophil phagocytosis.
- Iron consumption during rhEPO-stimulated erythropoiesis might explain the observed reduction in phagocytic activity.
Abstract:
The in vivo influence of recombinant human erythropoietin (rhEpo) and iron on human neutrophil (PMN) antimicrobial function was assessed. A total of 21 preterm infants were randomized to receive either 200 U/kg/other day of rHuEPO+12 mg/kg/day of iron (EPO+high Fe, seven infants) or 200 U/kg/other day of rhEPO+4 mg/kg/day of iron (EPO+standard Fe, 9 infants) or 4 mg/kg/day of iron only (standard Fe, five infants). PMNs were isolated from blood of these infants 60+/-5 days after birth and from eight healthy adults. No differences between infants and adults were found in PMN random migration and chemotactic activity to N-formylmethionyl leucyl phenylalanine (FMLP), superoxide anion production in response to FMLP and phagocytosis of Staphylococcus aureus. In contrast, percentage phagocytosis was significantly lower in EPO+standard Fe as compared to both EPO+high Fe and standard Fe groups (P<0.01). This modest impairment of phagocytic activity of neonatal PMNs found in association with administration of rhEPO and standard iron may be related to consumption of iron during rhEPO-enhanced erythropoiesis.