Related Experiment Video

Updated: Jul 31, 2026

Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays
12:48

Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays

Published on: February 19, 2013

(Na+ + K+) ATPase inhibitors and intracellular electrolytes in essential hypertension

T Iwaoka1, C A Nugent, T Umeda

  • 1Third Department of Internal Medicine, Kumamoto University Medical School, Japan.

Japanese Heart Journal
|September 1, 1987
PubMed

Insights

Essential hypertension is linked to increased plasma (Na+ + K+)-ATPase inhibition and lower white blood cell (WBC) potassium levels. This suggests a role for plasma enzyme inhibition in elevated blood pressure and altered WBC ion concentrations.

Area of Science:

  • Cardiovascular Physiology
  • Hypertension Research
  • Cellular Ion Transport

Background:

  • Essential hypertension is a complex condition with multifactorial origins.
  • Alterations in ion transport and cellular electrolyte concentrations are implicated in hypertension pathophysiology.
  • Plasma (Na+ + K+)-ATPase activity and white blood cell (WBC) ion levels are potential biomarkers.

Purpose of the Study:

  • To investigate the relationship between plasma (Na+ + K+)-ATPase inhibition, WBC electrolyte concentrations, and blood pressure in essential hypertension.
  • To determine if altered ion transport mechanisms contribute to the development of high blood pressure.

Main Methods:

  • Comparison of WBC sodium (Na+) and potassium (K+) concentrations, plasma (Na+ + K+)-ATPase inhibition, and blood pressure between normotensive controls and untreated hypertensive patients.
  • Statistical analysis to assess correlations between measured parameters.

Main Results:

  • Untreated hypertensive patients exhibited significantly lower WBC K+ concentrations compared to normotensive controls.
  • Plasma (Na+ + K+)-ATPase inhibition was significantly higher in untreated hypertensive patients.
  • A significant, albeit weak, positive correlation was found between plasma (Na+ + K+)-ATPase inhibition and mean blood pressure.
  • Higher plasma (Na+ + K+)-ATPase inhibition was associated with increased WBC Na+/K+ ratio in hypertensive patients.

Conclusions:

  • Plasma (Na+ + K+)-ATPase inhibition may contribute to elevated blood pressure in a subset of essential hypertension patients.
  • This inhibition is associated with altered intracellular potassium concentrations in WBCs.
  • These findings highlight a potential cellular mechanism involved in essential hypertension.

More Related Videos

Single-channel Analysis and Calcium Imaging in the Podocytes of the Freshly Isolated Glomeruli12:19

Single-channel Analysis and Calcium Imaging in the Podocytes of the Freshly Isolated Glomeruli

Published on: June 27, 2015

Recording of Inward Rectifying K+ Currents in Freshly Isolated Basilar Artery Smooth Muscle Cells by Patch Clamp Technique07:19

Recording of Inward Rectifying K+ Currents in Freshly Isolated Basilar Artery Smooth Muscle Cells by Patch Clamp Technique

Published on: February 7, 2025

Related Concept Videos

Antihypertensive Drugs: Action of Diuretics01:16

Antihypertensive Drugs: Action of Diuretics

Diuretics are antihypertensive drugs used to treat hypertension resulting from sodium and water retention. Sodium, vital for fluid balance and nerve or muscle function, is regulated by the kidneys through millions of nephrons. Blood enters nephrons via afferent arterioles, which branch into capillaries called glomeruli. These filter blood plasma, allowing water and solutes, like sodium ions, to pass through capillary walls into Bowman's capsule. The filtrate then flows through various tubules...
Antihypertensive Drugs: Potassium-Sparing Diuretics01:28

Antihypertensive Drugs: Potassium-Sparing Diuretics

Liddle syndrome is a genetically inherited form of hypertension characterized by the overactivity of epithelial sodium channels in the nephron, the functional unit of the kidney. This heightened activity leads to increased sodium reabsorption and excessive excretion of potassium. To counteract this, potassium-sparing diuretics such as amiloride are used. They function by blocking these sodium channels, thereby reducing the influx of sodium into the epithelial cells and minimizing the loss of...
Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors01:30

Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors

Angiotensin-converting enzyme (ACE), a vital component of the renin-angiotensin-aldosterone system, is abundant in lung endothelial cells. ACE converts the inactive decapeptide, angiotensin I, into the active octapeptide, angiotensin II. This potent vasoconstrictor narrows blood vessels, increasing resistance to blood flow and elevating blood pressure. Angiotensin II also stimulates aldosterone production, encouraging kidney cells to reabsorb more sodium and water from urine, thereby increasing...
Antihypertensive Drugs: Angiotensin II Receptor Blockers01:30

Antihypertensive Drugs: Angiotensin II Receptor Blockers

In the renin-angiotensin-aldosterone system, a hormone called angiotensin II plays a crucial role. It binds to the AT1 receptors in vascular smooth muscles coupled with Gq proteins. The activation of these receptors activates an enzyme called phospholipase C, which releases two molecules: inositol trisphosphate and diacylglycerol. These molecules cause a chain reaction that leads to the phosphorylation of myosin light chains and promotes interaction between actin and myosin, leading to smooth...
Antihypertensive Drugs: Direct Renin Inhibitors01:25

Antihypertensive Drugs: Direct Renin Inhibitors

The renin-angiotensin-aldosterone system (RAAS) is an intricate physiological pathway involving numerous enzymes and hormones, including renin, angiotensin-converting enzyme (ACE), angiotensin I and II, and aldosterone. Imbalances within this system increase the production of angiotensin II and aldosterone. Increased angiotensin II levels promote vasoconstriction and blood pressure elevation. Concurrently, higher aldosterone levels stimulate sodium and water reabsorption in the kidneys,...
Heart Failure Drugs: Inhibitors of Renin-Angiotensin System01:26

Heart Failure Drugs: Inhibitors of Renin-Angiotensin System

The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...