Is ouabain still used in modern medicine?

Its direct therapeutic use is very rare and largely historical. It is primarily a research tool in physiology and pharmacology.

Where does the name 'ouabain' come from?

It derives from the Somali name 'waabaayo' for the plant *Acokanthera ouabaio*, which is one of its sources.

Can ouabain be found in common plants?

No. It is sourced from specific African plants like *Strophanthus gratus* and *Acokanthera schimperi*.

Why is ouabain important in research?

Its specific and potent inhibition of a fundamental cellular pump (Na+/K+-ATPase) makes it invaluable for studying ion homeostasis, cell signalling, and cardiac function.

ouabain

C2 (Proficient - Very Low Frequency / Technical)

UK/ˈwɑːbeɪn/US/ˈwɑːbeɪn/

Technical/Scientific

My Flashcards

Definition

Meaning

A toxic cardiac glycoside used historically in medicine and derived from certain African plants.

In biochemistry and pharmacology, ouabain is a specific inhibitor of the sodium-potassium ATPase pump, used as a research tool.

Linguistics

Semantic Notes

This is a highly specialized term with a single, precise meaning in biosciences. It has no everyday figurative use.

Dialectal Variation

British vs American Usage

Differences

No significant differences in meaning or usage. Spelling and pronunciation are consistent.

Connotations

Purely scientific; carries connotations of toxicity, specific biochemical action, and historical medicinal use.

Frequency

Extremely rare outside of pharmacology, toxicology, and physiology contexts in both regions.

Vocabulary

Collocations

strong

cardiac glycosidesodium-potassium pumpATPase inhibitoradminister ouabain

medium

derived fromtoxic effects ofinhibit withsensitivity to ouabain

weak

plant sourceresearch involvingexperiment with

Grammar

Valency Patterns

Researchers incubated the cells *with* ouabain.Ouabain *inhibits* the enzyme.The toxicity *of* ouabain is well-documented.

Vocabulary

Synonyms

Neutral

g-strophanthin

Weak

cardiac inhibitor (broader term)

Vocabulary

Antonyms

agonistactivatorstimulant (context-dependent)

Usage

Context Usage

Academic

Central in physiology papers on ion transport and cardiac function.

Everyday

Virtually never used.

Technical

Precise term in pharmacology for a specific Na+/K+-ATPase inhibitor.

Examples

By Part of Speech

adjective

British English

The ouabain-binding site is highly conserved.
Ouabain sensitivity varies between species.

American English

The ouabain-binding site is highly conserved.
Ouabain sensitivity varies across species.

Examples

By CEFR Level

Ouabain is a powerful poison found in some African plants.
Doctors once used small doses of ouabain to treat heart failure.

The experiment demonstrated that ouabain completely blocked the ion transport mechanism.
Historically, ouabain was employed as an arrow poison by certain tribes.

Learning

Memory Aids

Mnemonic

Think: 'OUA-tain' (as in 'obtain') from a tree; you obtain this poison from the ouabio tree.

Conceptual Metaphor

A KEY that fits into and BLOCKS a specific LOCK (the ATPase enzyme).

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

Не путать с более общими терминами "сердечный гликозид" (cardiac glycoside) или "яд" (poison). Ouabain — конкретное вещество.

Common Mistakes

Mispronouncing as /uːˈæbeɪn/.
Using it as a general term for poison.
Misspelling as 'wabain' or 'oubain'.

Practice

Quiz

Fill in the gap

In the laboratory, researchers often use to study the function of the sodium-potassium pump.

Multiple Choice

What is the primary biochemical action of ouabain?

FAQ

Frequently Asked Questions

: Its direct therapeutic use is very rare and largely historical. It is primarily a research tool in physiology and pharmacology.
: It derives from the Somali name 'waabaayo' for the plant *Acokanthera ouabaio*, which is one of its sources.
: No. It is sourced from specific African plants like *Strophanthus gratus* and *Acokanthera schimperi*.
: Its specific and potent inhibition of a fundamental cellular pump (Na+/K+-ATPase) makes it invaluable for studying ion homeostasis, cell signalling, and cardiac function.