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Sodium content and sodium efflux of mononuclear leucocytes from young subjects at increased risk of developing
K E Pedersen1, J R Nielsen, N A Klitgaard
1Department of Clinical Chemistry, Odense University Hospital, Denmark.
Insights
Young men at risk for hypertension show altered sodium transport in their white blood cells (leukocytes). These cellular changes, specifically increased sodium efflux, may indicate predisposition to essential hypertension.
Area of Science:
- Cardiovascular Physiology
- Cellular Biology
- Hypertension Research
Background:
- Essential hypertension has a complex etiology involving genetic and environmental factors.
- Cellular ion transport abnormalities are implicated in the pathophysiology of hypertension.
- Identifying early cellular markers can aid in predicting hypertension risk.
Purpose of the Study:
- To investigate in vitro cellular changes in mononuclear leukocytes.
- To assess volume, sodium and potassium content, and sodium efflux in individuals at risk for essential hypertension.
- To correlate cellular changes with borderline hypertension and hereditary factors.
Main Methods:
- Mononuclear leukocytes served as the cellular model for in vitro analysis.
- Measurements included cell volume, sodium/potassium content, and sodium efflux rate constants.
- Four subject groups were analyzed: normotensive offspring of hypertensives, borderline hypertensive offspring of hypertensives, borderline hypertensives with normotensive parents, and normotensive controls.
Main Results:
- No significant differences in cellular sodium/potassium content were observed across groups.
- An increased ouabain-insensitive sodium efflux rate constant and absolute efflux were found in offspring of hypertensives.
- Borderline hypertensives exhibited significantly increased ouabain-sensitive absolute sodium efflux compared to normotensives.
Conclusions:
- Leukocytes from individuals predisposed to hypertension display an enhanced ouabain-insensitive sodium transport mechanism.
- In borderline hypertensive individuals, the sodium-potassium pump appears to be activated.
- These findings suggest potential cellular biomarkers for hypertension risk assessment.
Abstract:
Mononuclear leucocytes were used as a cellular model for the in vitro measurements of volume, sodium and potassium content, sodium efflux rate constants and absolute sodium efflux in order to assess any cellular changes in young men at increased risk of developing essential hypertension, and to analyze whether any such changes were associated with borderline hypertension and/or heredity. Four groups of subjects were evaluated: 28 normotensive (NTO) and 20 borderline hypertensive (BHO) offspring of hypertensives, 12 borderline hypertensives with normotensive parents (BH) and 28 normotensive subjects with normotensive parents (NT). The cellular sodium/potassium contents of the four groups were not discernibly different. Ouabain insensitive sodium efflux rate constant and corresponding absolute efflux were significantly increased in offspring of hypertensives. Ouabain sensitive absolute sodium efflux was significantly increased in borderline hypertensives (BHO + BH) compared to normotensives (NT + NTO). These results indicate that leucocytes from subjects predisposed to hypertension possess an increased ouabain insensitive sodium transport mechanism and in subjects with borderline hypertension the sodium-potassium pump seems activated.