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Oxygen-detoxifying enzymes in neutrophils of infants and their mothers
Insights
Infant neutrophils show decreased levels of glutathione peroxidase (GPX) and catalase, impacting their ability to neutralize reactive oxygen species. This enzyme imbalance may explain impaired infant immune cell function and susceptibility to oxidative damage.
Area of Science:
- Immunology
- Biochemistry
- Neonatal Medicine
Background:
- Neutrophil dysfunction is linked to oxidative damage.
- Infant neutrophils exhibit increased oxidative metabolism and decreased function.
- Infant erythrocytes show oxidative susceptibility due to enzyme deficiencies.
Purpose of the Study:
- To investigate if reduced oxygen-detoxifying enzyme activity contributes to impaired infant neutrophil function.
- To compare enzyme levels in infant, maternal, and control neutrophils.
Main Methods:
- Quantification of superoxide dismutase (SOD), glutathione peroxidase (GPX), and catalase activities in neutrophils.
- Comparison of enzyme levels across infant, maternal, and control groups.
Main Results:
- Superoxide dismutase (SOD) activity was comparable across all groups.
- Glutathione peroxidase (GPX) and catalase activities were significantly lower in infant neutrophils.
- An imbalance in oxygen-detoxifying enzymes was observed in infant neutrophils.
Conclusions:
- Infant neutrophils possess significantly reduced GPX and catalase levels.
- This enzyme deficiency likely increases susceptibility to oxidative damage.
- The observed imbalance may underlie impaired infant neutrophil function.
Abstract:
The oxygen-detoxifying enzymes of neutrophils, SOD, GPX, and catalase, were measured in neutrophils obtained from normal human infants, their mothers, and controls to determine whether or not the impaired functions of infant neutrophils might be related to a decreased ability of these cells to detoxify reactive forms of oxygen. The rationale was based on the following. (1) Defective functions have been reported in neutrophils sustaining oxidative damage. (2) Increased oxidative metabolism and decreased functions can be demonstrated concomitantly in infant neutrophils. (3) Neutrophils from infants may be analogous to infant erythrocytes, cells known to exhibit increased susceptibility to oxidative injury and dysfunctions that are apparently related to deficiencies of GPX and catalase. SOD activity was similar in neutrophils obtained from infants, their mothers, and controls, whereas both GPX and catalase were significantly decreased in infant cells. The data suggest that infant neutrophils were rendered susceptible to oxidative damage and possibly to defective function by an imbalance of oxygen-detoxifying enzymes.