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Sodium transport in erythrocytes: differences between normal children and children with primary and secondary
M Uchiyama1, V Shah, C E Daman Willems
1Renal Unit, Hospital for Sick Children, London.
Insights
Children with primary hypertension exhibit higher intracellular sodium and lower sodium-potassium pump activity compared to healthy children and those with secondary hypertension. These erythrocyte findings suggest altered ion transport in primary hypertension.
Area of Science:
- Pediatric Nephrology
- Cardiovascular Physiology
- Biochemistry
Background:
- Hypertension in children is a growing concern, with primary and secondary forms having distinct pathophysiologies.
- Erythrocyte sodium transport is a potential biomarker for cardiovascular health and hypertension.
Purpose of the Study:
- To investigate erythrocyte sodium transport mechanisms in children with primary hypertension compared to normal and secondary hypertension groups.
- To assess sodium/potassium adenosine triphosphatase (Na+/K+-ATPase) pump activity in pediatric hypertension.
Main Methods:
- Measurements included erythrocyte intracellular sodium concentration, total sodium efflux rate constant, and maximum ouabain binding.
- These parameters reflect Na+/K+-ATPase pump function and number of sites.
Main Results:
- Children with primary hypertension showed significantly higher intracellular sodium (8.2 mmol/l cells).
- They also had significantly lower sodium efflux rate constants (0.5071) and ouabain binding (9.1 nmol/l cells) compared to normal and secondary hypertension groups.
- These findings indicate reduced Na+/K+-ATPase activity in primary pediatric hypertension.
Conclusions:
- Primary hypertension in children is associated with impaired erythrocyte sodium transport and reduced Na+/K+-ATPase pump activity.
- These erythrocyte alterations may serve as indicators for primary hypertension in pediatric populations.
Abstract:
The following measurements were made in normal children, children with primary hypertension, and children with secondary hypertension: erythrocyte intracellular sodium concentration, total sodium efflux rate constant, and maximum binding of ouabain to erythrocytes reflecting the number of sodium/potassium adenosine triphosphatase pump sites. Children with primary hypertension had a significantly higher mean erythrocyte intracellular sodium concentration (8.2 compared with 6.6 and 6.7 mmol/l cells), and significantly lower total sodium efflux rate constant (0.5071 compared with 0.6983 and 0.6197) and maximum binding of ouabain to erythrocytes (9.1 compared with 11.7 and 11.0 nmol/l cells) than normal children and children with secondary hypertension, respectively.