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Oxidative metabolism in cord-blood polymorphonuclear leucocytes
Archives of Disease in Childhood
|January 1, 1978
Summary
Newborns exhibit heightened resting oxidative metabolism in polymorphonuclear leucocytes but struggle to sustain it post-phagocytosis, suggesting potential metabolic reserve deficiencies linked to infant bacterial infection susceptibility.
Area of Science:
- Immunology
- Neonatal Physiology
- Cellular Metabolism
Background:
- Neonatal immune defenses are critical for infant health.
- Polymorphonuclear leucocytes (PMNs) play a key role in fighting bacterial infections.
- Understanding neonatal PMN function is essential for addressing infant susceptibility to infections.
Purpose of the Study:
- To investigate the oxidative metabolism of PMNs in healthy term infants.
- To compare the metabolic activity of neonatal PMNs with adult controls.
- To explore the functional capacity of neonatal PMNs in response to phagocytosis.
Main Methods:
- Isolation of PMNs from cord blood of healthy, term infants.
- Assessment of oxidative metabolism using hexose monophosphate shunt activity and chemiluminescence.
- Comparison of basal and stimulated metabolic rates between neonatal and adult PMNs.
Main Results:
- Resting neonatal PMNs showed higher basal oxidative metabolism than adult controls.
- Upon phagocytosis, neonatal PMNs initiated increased oxidative metabolism, reaching normal peak activity.
- Neonatal PMNs were unable to maintain elevated metabolic rates as long as adult PMNs.
Conclusions:
- Neonatal PMNs may possess a diminished metabolic reserve.
- Impaired metabolic sustainability in neonatal PMNs could contribute to increased susceptibility to bacterial infections in newborns.
- Further research into neonatal immune cell function is warranted.