Key result
New fluorescence immunoassays detect fast and slow skeletal troponin I isoforms down to ~0.07 ng/mL.
Why the study?
Skeletal troponin I isoforms are tissue-specific biomarkers of skeletal muscle damage, motivating the development of immunochemical detection systems for their quantification and complex characterization.
The newly developed highly sensitive and specific monoclonal antibodies for skeletal troponin I isoforms provide a novel tool for detecting skeletal muscle damage without cross-reactivity to cardiac troponin.
May aid preclinical skeletal muscle injury models; leaves open clinical translation for isoform-specific troponin assays.
Troponin I (TnI), together with troponin T (TnT) and troponin C (TnC), forms the troponin complex, a thin filament protein of the striated muscle that plays a key role in regulation of muscle contraction. In humans, TnI is represented by three isoforms: cardiac, which is synthesized only in myocardium, and fast and slow skeletal, which are synthesized in fast- and slow-twitch muscle fibers, respectively. Skeletal TnI isoforms could be used as biomarkers of skeletal muscle damage of various etiologies, including mechanical trauma, myopathies, muscle atrophy (sarcopenia), and rhabdomyolysis. Unlike classical markers of muscle damage, such as creatine kinase or myoglobin, which are also present in other tissues, skeletal TnIs are specific for skeletal muscle. In this study, we developed a panel of monoclonal antibodies for immunochemical detection of skeletal TnI isoforms using Western blotting (sensitivity: 0.01-1 ng per lane), immunohistochemical assays, and fluorescence immunoassays. Some of the designed fluorescence immunoassays enable quantification of fast skeletal (limit of detection [LOD] = 0.07 ng/mL) and slow skeletal (LOD = 0.1 ng/mL) TnI isoforms or both isoforms (LOD = 0.1 ng/ml). Others allow differential detection of binary (with TnC) or ternary (with TnT and TnC) complexes, revealing composition of troponin forms in the human blood.
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Bogomolova et al. (2025) studied Skeletal muscle damage. Monoclonal antibodies for skeletal Troponin I isoforms was evaluated on Limit of detection (LOD) and specificity of fluorescence immunoassays. A panel of monoclonal antibodies and fluorescence immunoassays was developed for the specific detection of fast and slow skeletal troponin I isoforms, achieving limits of detection of 0.07-0.11 ng/mL.
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