Intracellular pH in human and experimental hypertension

Area of Science:

• Biochemistry
• Physiology
• NMR Spectroscopy

Background:

• Essential hypertension is a complex condition with multifactorial origins.
• Intracellular pH (pH(i)) is a critical cellular parameter influencing various physiological processes.
• Previous research suggests potential links between cellular pH and blood pressure regulation.

Purpose of the Study:

• To investigate intracellular pH differences in erythrocytes between normotensive and hypertensive individuals.
• To examine the effect of antihypertensive treatment on erythrocyte intracellular pH.
• To explore the relationship between intracellular pH and blood pressure in different rat models of hypertension.

Main Methods:

• Utilized 31P Nuclear Magnetic Resonance (NMR) spectroscopy to measure intracellular pH in human erythrocytes.
• Assessed intracellular pH in normotensive and hypertensive rat models, including deoxycorticosterone/saline and 2 kidney, 1 clip Goldblatt models.
• Correlated erythrocyte intracellular pH values with measured blood pressure across different experimental groups.

Main Results:

• Untreated essential hypertensives exhibited significantly lower erythrocyte intracellular pH compared to normotensive subjects (7.17 ± 0.02 vs. 7.28 ± 0.02, p < 0.01).
• Antihypertensive treatment normalized erythrocyte intracellular pH in treated essential hypertensives (7.27 ± 0.02).
• In rat models, intracellular pH values inversely correlated with blood pressure, irrespective of dietary calcium effects.

Conclusions:

• Lower intracellular pH is a common finding across various hypertensive states in humans and animal models.
• These pH alterations may contribute to the pathophysiology of hypertension.
• Changes in intracellular pH could potentially link hypertension with other metabolic disorders like diabetes and obesity.