troponin

[troh-puh-nin, trop-uh-]

noun

Biochemistry.

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

troponin

1. 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.

Word History and Origins

Origin of troponin¹

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

Example Sentences

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

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Eckle has used light therapy with patients after surgery and seen positive results including lower levels of troponin, a key protein whose elevation can signal a heart attack or stroke.

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

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Chronic heart problems and other preexisting conditions might be to blame in 18 cases, but for the other 22 cases—2.8% of participants, women and men—Müller believes the vaccine caused troponin levels to rise.

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

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