troponin

American

[troh-puh-nin, trop-uh-] / ˈtroʊ pə nɪn, ˈtrɒp ə- /

noun

Biochemistry.

a protein of muscle tissue that binds calcium ions and is involved in contraction.

troponin Scientific

/ trō′pə-nĭn,trŏp′ə- /

One of the proteins that make up the thin filaments of muscle tissue and that regulate muscle contraction and relaxation. Troponin occurs in three forms bound together in a complex. One of the three forms is a receptor of calcium ions that induces structural changes that allow the actin in the thin filaments to interact with myosin, causing contraction.

Etymology

Origin of troponin

1965–70; tropo(myosin) ( see tropo-, myosin) + -n- (of uncertain origin) + -in ²

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

troponin

To determine whether these cytokines directly harm the heart, the team vaccinated young male mice and observed increased cardiac troponin levels, indicating heart muscle injury.

From Science Daily ● Dec. 27, 2025

"My troponin levels, which is a heart attack marker, were extremely high."

From BBC ● Feb. 13, 2025

The thin filament consists of F-actin, troponin, tropomyosin, and nebulin.

From Science Daily ● Nov. 1, 2023

The good news: In both studies, troponin levels quickly fell to normal.

From Science Magazine ● Oct. 17, 2022

Two other components of the thin filament are tropomyosin and troponin.

From Textbooks ● Jun. 9, 2022

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023