Redox status in very-low birth-weight newborns

Area of Science:

• Biochemistry
• Neonatology
• Metabolic Disorders

Background:

• Inborn errors of metabolism, including pyruvate metabolism and gluconeogenesis disorders, can cause lactic acidosis in newborns.
• Assessing mitochondrial oxidation-reduction activity is crucial for screening these conditions.
• Plasma lactate, pyruvate, and ketone body levels reflect redox status and are influenced by nutrition and stress.

Purpose of the Study:

• To evaluate the redox status in very-low birth-weight (VLBW) infants.
• To determine if nutritional strategies impact redox status.
• To investigate the relationship between redox status and intrauterine growth retardation (IUGR).

Main Methods:

• Simultaneous measurement of plasma lactate, pyruvate, and ketone bodies (beta-hydroxybutyrate and acetoacetate).
• Analysis of redox status in 55 VLBW infants under varying nutritional conditions (oral feeding vs. enteral nutrition).
• Comparison of redox status parameters between infants with IUGR and appropriate for gestational age infants.

Main Results:

• Redox status values were independent of nutritional type (oral vs. enteral).
• Significant differences in redox status were observed between infants with IUGR and appropriate growth.
• Infants with IUGR exhibited lower preprandial glucose and ketone bodies but higher lactate and pyruvate levels compared to appropriate growth infants.
• Lactate/pyruvate and beta-hydroxybutyrate/acetoacetate ratios remained normal in IUGR infants.

Conclusions:

• Redox status assessment is a valuable tool for evaluating metabolic function in VLBW infants.
• IUGR in VLBW infants is associated with distinct alterations in glucose, ketone, lactate, and pyruvate metabolism.
• Findings suggest potentially reduced gluconeogenesis and beta-oxidation activity in VLBW infants with IUGR.