Track topics on Twitter Track topics that are important to you
Troponin I (TnI) is the inhibitory subunit of the troponin complex in the sarcomeric thin filament of striated muscle and plays a central role in the calcium regulation of contraction and relaxation. Vertebrate TnI has evolved into three isoforms encoded by three homologous genes: TNNI1 for slow skeletal muscle TnI, TNNI2 for fast skeletal muscle TnI and TNNI3 for cardiac TnI, which are expressed under muscle type-specific and developmental regulations in both the atrium and ventricle of the heart. Skeletal muscle TnI (both sTnI iso-forms) have been proposed as a sensitive and fast fiber-specific serum marker of skeletal muscle damage; fsTnI concentration in increased peripheral blood when fast twitch fibers were damaged. In our study we investigate if the 'Troponin I, fast skeletal muscle' can also be used as a reliable diagnostic tool in forensic practice, to perform differential diagnosis about vitality in suicide by hanging and simulated hanging (suspension of the victim after murder). We selected 8 women and 13 men, mean age 52.2 years, who died from suicidal hanging. The ligature material used for hanging was soft material in 11 cases and hard material in 10 cases. We chose cases as a control group of adults (n = 10; six women, four men, mean age 47.3 years) that died from opioid overdose (n = 2), car accident (n = 3) and sudden cardiac death (n = 5). Those deaths were characterized by their rapidity. To test the Anti-Troponin I fast skeletal muscle Antibody (Abcam clone-134,838), we used a case of a subject who died of myocardial infarction (timing infarct dated to 24-36 h prior to death). The reactions to Troponin I (namely the amount and extent of marker depletion) was scored for each section from 0 to -3: 0 = no loss of staining; -1 = minimal decrease in staining, compared to normally stained tissue; -2 = clear decrease in staining with some positivity (brown color) remaining; and -3 = no positive (brown) staining. The set of results obtained leads us to believe that the use of this antibody (Anti-Troponin I fast skeletal muscle antibody) is very promising to be able to make a certain differential diagnosis between antemortem and postmortem hangings. It should be emphasized that the present study seems to open new and promising horizons in the possibility to discriminate between suicidal hanging and simulated hanging (suspension of the victim after murder).
This article was published in the following journal.
Name: Forensic science international
Skeletal muscles include fast and slow muscle fibers. The tibialis anterior muscle (TA) is mainly composed of fast muscle fibers, whereas the soleus muscle (SOL) is mainly composed of slow muscle fibe...
Skeletal muscle secretes myokines, which are involved in metabolism and muscle function regulation. The role of fasting on myokine expression in skeletal muscle is largely unknown. In this study, we u...
Carazolol (CZL) is a known agonist of β3 and antagonist of β1 and β2 adrenoceptors (AR), used in the animal production industry to improve meat quality by reducing animal stress and skeletal muscle...
Protein arginine methyltransferases (PRMTs) have emerged as important regulators of skeletal muscle metabolism and regeneration. However, the direct roles of the various PRMTs during skeletal muscle r...
To assess the efficacy of tirasemtiv, a fast skeletal muscle troponin activator, vs. placebo in patients with amyotrophic lateral sclerosis.
This study examines the impact of increasing energetic stress during an 8-hour fast on metabolic pathways in human skeletal muscle. Specifically, participants will undergo two 8-hour fasti...
Cancer cachexia is responsible for the death of approximately 20% of patients. Myostatin is a master negative regulator of skeletal muscle mass. If the role of myostatin in cancer cachexia...
Visits to the emergency department (ED) for chest pain are extremely common and require a safe, rapid and efficacious treatment algorithm to exclude a possible AMI. These diagnostic algori...
Elevated troponin is powerful and independent adverse prognostic marker in patient with ACS. However, non specific (non cardiac) troponin elevation is a common finding among hospitalized p...
Troponin T-us is a cardiac marker for myocardial infarction. Its use in neonates is increasing, yet normal values are still to be determined for the latest generation of tests, such as Hig...
One of the three polypeptide chains that make up the TROPONIN complex of skeletal muscle. It is a calcium-binding protein.
Skeletal muscle fibers characterized by their expression of the Type II MYOSIN HEAVY CHAIN isoforms which have high ATPase activity and effect several other functional properties - shortening velocity, power output, rate of tension redevelopment. Several fast types have been identified.
One of the minor protein components of skeletal muscle. Its function is to serve as the calcium-binding component in the troponin-tropomyosin B-actin-myosin complex by conferring calcium sensitivity to the cross-linked actin and myosin filaments.
One of the three polypeptide chains that make up the TROPONIN complex. It is a cardiac-specific protein that binds to TROPOMYOSIN. It is released from damaged or injured heart muscle cells (MYOCYTES, CARDIAC). Defects in the gene encoding troponin T result in FAMILIAL HYPERTROPHIC CARDIOMYOPATHY.
Large, multinucleate single cells, either cylindrical or prismatic in shape, that form the basic unit of SKELETAL MUSCLE. They consist of MYOFIBRILS enclosed within and attached to the SARCOLEMMA. They are derived from the fusion of skeletal myoblasts (MYOBLASTS, SKELETAL) into a syncytium, followed by differentiation.
Arthritis Fibromyalgia Gout Lupus Rheumatic Rheumatology is the medical specialty concerned with the diagnosis and management of disease involving joints, tendons, muscles, ligaments and associated structures (Oxford Medical Diction...
Within medicine, nutrition (the study of food and the effect of its components on the body) has many different roles. Appropriate nutrition can help prevent certain diseases, or treat others. In critically ill patients, artificial feeding by tubes need t...