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Cardiac troponin I, cTnI, is exclusively expressed in cardiac
muscle tissue in a single isoform with molecular weight ~24
KD. cTnI forms complex with cardiac Troponin T (cTnT) and
Troponin C (TnC) to regulate the formation of actomyosin
filament and subsequent cardiac muscle contraction. During
cardiac muscle tissue injury, cTnI is released into the blood
of patient and indicative of cardiac cell death. cTnI has been
widely used as a sensitive and specific diagnostic marker of
acute myocardial infarction (AMI), post-surgery myocardium
trauma, chemotherapy cardiotoxicity, and some other
diseases linked to cardiac muscle injury. In recent years,
high-sensitivity cTnI assay has been used to accurately
diagnose AMI after the onset of acute chest pain. |