Decreased cell membrane magnesium in some essential hypertension patients

Area of Science:

• Cardiovascular Physiology
• Mineral Metabolism
• Cellular Biology

Background:

• Essential hypertension is a complex condition with multifactorial causes.
• Magnesium plays a crucial role in various physiological processes, including cardiovascular health.
• Alterations in magnesium levels and cellular binding have been implicated in hypertensive states.

Purpose of the Study:

• To investigate magnesium concentrations (total, ultrafilterable, and nonfilterable) in plasma and intracellular compartments of blood in essential hypertensive patients.
• To examine the binding of magnesium to erythrocyte membranes in essential hypertensive patients.
• To explore the relationship between magnesium levels, binding, and blood pressure.

Main Methods:

• Measurement of total ([T-Mg]), ultrafilterable ([UF-Mg]), and nonfilterable ([NF-Mg]) magnesium in plasma and whole blood from hypertensive and normotensive subjects.
• Analysis of magnesium binding to erythrocyte membranes.
• Incubation experiments to assess the effect of normotensive plasma on hypertensive erythrocytes.

Main Results:

• Essential hypertensive patients showed decreased whole blood magnesium due to reduced [UF-Mg] and [NF-MG].
• [UF-Mg] was elevated in plasma but decreased intracellularly, while plasma [NF-Mg] decreased in hypertensives.
• Decreased magnesium binding to erythrocyte membranes was observed in hypertensive patients and correlated with blood pressure.

Conclusions:

• Reduced magnesium binding to erythrocyte membranes may contribute to decreased intracellular [UF-Mg] in essential hypertension.
• The observed alterations in magnesium binding suggest it could be a contributing factor in some cases of essential hypertension.
• Hypertension itself does not appear to cause decreased magnesium binding to cell membranes, as normal binding was seen in some hypertensive individuals.