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Cellular ionic composition at the prehypertensive phase of essential hypertension
E Ambrosioni1, C Borghi, S Boschi
1Servizio di Farmacologia Clinica e Terapia, Policlinico S. Orsola, Bologna, Italy.
Insights
Young subjects at risk for hypertension may have elevated intracellular sodium (Na+). Leukocyte studies show higher Na+ in those with a family history of hypertension, suggesting potential early indicators for essential hypertension risk.
Area of Science:
- Cardiovascular Physiology
- Cellular Biology
- Hypertension Research
Background:
- Essential hypertension is a complex condition with multifactorial origins.
- Early identification of individuals at risk is crucial for preventative strategies.
- Cellular ion content, particularly sodium and potassium, is implicated in blood pressure regulation.
Purpose of the Study:
- To review and synthesize existing literature on intracellular sodium (Na+) and potassium (K+) levels in young individuals at risk for essential hypertension.
- To investigate discrepancies in red blood cell (RBC) studies and consolidate findings from leukocyte studies.
- To explore the relationship between cellular ion content, blood pressure reactivity, and dietary salt intake.
Main Methods:
- Literature review of studies examining cell sodium and potassium content in subjects with a family history of hypertension (genetic normotensives) and borderline hypertension.
- Analysis of conflicting results from red blood cell (RBC) studies.
- Consolidation of findings from leukocyte studies regarding intracellular Na+ levels.
- Presentation of data from the authors' own studies on normotensive and borderline subjects.
Main Results:
- Red blood cell (RBC) studies on intracellular Na+ in genetic normotensives yielded conflicting results, with about half showing an increase.
- Leukocyte studies more consistently demonstrated increased intracellular Na+ in genetic normotensives.
- Subjects with high intracellular Na+, even if normotensive, showed exaggerated pressor responses to stimuli.
- Reduction in dietary salt intake led to decreased intracellular sodium and pressor reactivity.
- Borderline hypertensive subjects sometimes exhibited increased intracellular Na+ and K+.
Conclusions:
- Elevated intracellular Na+ can be present in normotensive individuals, particularly those with a genetic predisposition to hypertension.
- Leukocyte Na+ content may be a more reliable indicator than RBC Na+ in at-risk individuals.
- Further longitudinal studies are needed to confirm if high intracellular Na+ predicts future hypertension development.
- Intervention with reduced dietary salt may mitigate hypertension risk factors by lowering both intracellular sodium and pressor reactivity.
Abstract:
This article reviews the data from literature regarding cell sodium and potassium content in young subjects at risk of developing essential hypertension (subjects with family history of hypertension or with borderline hypertension). The studies performed with red blood cells have produced conflicting results: approximately one-half of these studies have found an increase in intracellular Na+ in subjects with family history of hypertension (genetic normotensives) whereas the other studies found no difference. The reasons for these discrepancies are discussed. Studies with leukocytes gave more univocal results and the majority of these studies found an increase in intracellular Na+ in many genetic normotensives. These observations emphasize that it is possible to find a high intracellular Na+ in subjects with normal blood pressure. Longitudinal studies are need to clarify whether subjects with high Na+ are those who will develop hypertension. The data from our studies suggest that subjects with high Na+, even if they are normotensive, exhibit an exaggerated pressor response to mental and physical activities and that a reduction in dietary salt content produces a parallel decrease in intracellular sodium and in pressor reactivity. The data on borderline hypertension are even more scarce than those on genetic normotensives and the different classification criteria produce results which are frequently not comparable. Our studies showed that in borderline subjects not only intracellular Na+ can be increased, but also intracellular K+.(ABSTRACT TRUNCATED AT 250 WORDS)