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Factors influencing leucocyte sodium transport in hypertension
Insights
Essential hypertension is linked to reduced sodium efflux and increased intracellular sodium. Thiazide diuretics can normalize this sodium imbalance, suggesting a therapeutic target for managing blood pressure.
Area of Science:
- Cardiovascular Physiology
- Nephrology
- Hypertension Research
Background:
- Essential hypertension is characterized by altered sodium transport, specifically reduced ouabain-sensitive sodium efflux and increased intracellular sodium.
- A significant overlap exists between hypertensive and normotensive individuals regarding these sodium transport parameters.
- The rate constant for sodium efflux shows a negative correlation with diastolic blood pressure.
Purpose of the Study:
- To investigate the relationship between sodium transport abnormalities and essential hypertension.
- To explore the correlation between sodium efflux rate constant and renin/angiotensin system activity.
- To evaluate the effect of thiazide diuretics on sodium transport in hypertensive patients.
Main Methods:
- Measurement of the rate-constant for ouabain-sensitive sodium efflux.
- Assessment of intracellular sodium levels.
- Correlation analysis between rate constant and diastolic blood pressure and renin/angiotensin system activity.
- In vitro studies using hypertensive patient serum to assess its effect on normal cells.
Main Results:
- A reduced rate-constant for sodium efflux and increased intracellular sodium were observed in essential hypertension.
- The rate constant was most depressed in hypertensives with suppressed renin/angiotensin systems.
- Thiazide diuretic treatment normalized the sodium efflux rate constant in essential hypertensives.
- Hypertensive serum depressed the rate constant of normal cells in vitro.
Conclusions:
- Sodium transport abnormalities, specifically reduced sodium efflux, are a feature of essential hypertension.
- These abnormalities correlate with blood pressure and renin/angiotensin system status.
- Thiazide diuretics may correct these cellular defects, offering a mechanism for their antihypertensive effect.
Abstract:
Studies in our laboratory and by others have repeatedly shown that the mean value of the rate-constant for ouabain-sensitive sodium efflux is reduced and intracellular sodium increased in essential hypertension, but that there is considerable overlap with the normotensive population. There is a significant negative correlation between the rate constant and the diastolic blood pressure. The depression of the rate constant is most marked in those hypertensives with the most suppressed renin/angiotensin systems. Treatment of a population of essential hypertensives with thiazide diuretics returns the rate constant to normal. The serum of hypertensives depresses the rate constant of normal cells in vitro in proportion to the degree of abnormality present in the hypertensive's cells.