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Pertici, Irene; Caremani, Marco; Reconditi, Massimo
Journal of muscle research and cell motility, 03/2019, Letnik: 40, Številka: 1Journal Article
The evidence, in both resting and active muscle, for the presence of an I-band spring element like titin that anchors the Z line to the end of the thick filament did not yet produce a proper theoretical treatment in a complete model of the half-sarcomere. The textbook model developed by A. F. Huxley and his collaborators in 1981, which provides that the half-sarcomere (hs) compliance is due to the contribution of the compliances of the thin and thick filaments and actin-attached myosin motors, predicts that at any sarcomere length (SL) the absence of attached motors results in an infinite half-sarcomere compliance, in contrast with the observations. Growing evidence for the presence of a titin-like I-band spring urges the 1981 model to be implemented to include the contribution of this element in the mechanical model of the half-sarcomere. The model described here represents a tool for the interpretation of measurements of hs stiffness at increasing SL, which is important either in relation to the mechanism of stabilisation of SL against the consequence of sarcomere inhomogeneity in active force generation, or for investigations on the role of titin as mechano-sensor in thick filament regulation. Moreover the model opens the possibility for understanding the functional differences related to the titin isoform of various muscle types and the mechanism by which mutations in titin gene lead to myopathies.
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