Related Experiment Video
Updated: Aug 11, 2026
Non-invasive Optical Measurement of Cerebral Metabolism and Hemodynamics in Infants
Published on: March 14, 2013
Red cell phosphate metabolism in full-term neonates
Insights
Hypoxia and feeding alter neonatal red blood cell phosphate levels, impacting energy metabolism. Intracellular phosphate metabolism in neonates appears independent of extracellular changes, requiring further research.
Area of Science:
- Neonatal Physiology
- Red Blood Cell Metabolism
- Inorganic Phosphate Homeostasis
Background:
- Hypoxia and feeding are critical factors influencing neonatal metabolic adaptation.
- Red blood cell (RBC) inorganic phosphate (Pi) concentrations and their distribution are vital for cellular function.
- Understanding neonatal phosphate metabolism is crucial for assessing infant health and development.
Purpose of the Study:
- To investigate the effects of hypoxia and feeding on red cell inorganic phosphate (Pi) concentrations in neonates.
- To examine the impact of these conditions on intracellular Pi levels, phosphate distribution across the erythrocyte membrane, and related energy metabolites.
- To determine if intracellular phosphate metabolism in neonates aligns with extracellular phosphate fluctuations.
Main Methods:
- Measurement of extracellular and intracellular inorganic phosphate (Pi) in neonatal red blood cells.
- Analysis of adenosine triphosphate (ATP) and 2,3-diphosphoglycerate (2,3-DPG) levels in erythrocytes.
- Comparison between hypoxic neonates, breast-fed neonates, and control infants.
Main Results:
- Hypoxia increased extracellular Pi but not intracellular Pi in neonatal RBCs, lowering phosphate distribution across the erythrocyte membrane.
- Hypoxic neonates exhibited lower RBC adenosine triphosphate (ATP) and higher 2,3-diphosphoglycerate (2,3-DPG) levels compared to controls.
- Breast-fed neonates showed increased plasma and RBC Pi, altering molar Pi distribution and resulting in lower ATP and higher 2,3-DPG than day-one controls.
Conclusions:
- Neonatal intracellular phosphate metabolism does not directly mirror extracellular phosphate changes under hypoxia or feeding.
- Altered phosphate distribution influences RBC energy metabolism, indicated by changes in ATP and 2,3-DPG levels.
- Further research is necessary to identify the specific factors regulating intracellular phosphate metabolism in neonates.
Abstract:
The effects of hypoxia and feeding on red cell inorganic phosphate (Pi) concentrations were studied in neonates. Although hypoxia caused a rise in extracellular Pi, the intracellular concentration of this ion did not change in comparison to control infants of the same age (first 24 h). As a result of these changes, the distribution of phosphate ions across the erythrocyte membrane was significantly lower in the hypoxic infants than in the controls. In the hypoxic infants, adenosine triphosphate (ATP) levels in the red cells were found significantly lower than in controls, while the 2,3-diphosphoglycerate (2,3-DPG) levels were raised. In breast-fed 2 or 3-day-old neonates, both plasma and red cell Pi were found to be increased but to different degrees, affecting therefore the molar Pi distribution, which was lower than in the controls of the first day. In these infants, ATP was lower and 2,3-DPG higher than in the controls of the first day of life. These findings suggest that intracellular phosphate metabolism in neonates does not follow extracellular phosphate changes. Further investigation is needed to elucidate the controlling factors.
Related Concept Videos
01:14Erythropoiesis
01:22Lifecycle of Erythrocytes
The resident phagocytic macrophages deal with these damaged cells by engulfing them and separating their globin and heme groups.