Nanometer scale difference in myofilament lattice structure of muscle alters muscle function in a spatially explicit model
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| Publicado en: | PLoS Computational Biology vol. 21, no. 4 (Apr 2025), p. e1012862-e1012885 |
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Public Library of Science
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| Acceso en línea: | Citation/Abstract Full Text Full Text - PDF |
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| 024 | 7 | |a 10.1371/journal.pcbi.1012862 |2 doi | |
| 035 | |a 3270580275 | ||
| 045 | 2 | |b d20250401 |b d20250430 | |
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| 100 | 1 | |a Travis Carver Tune | |
| 245 | 1 | |a Nanometer scale difference in myofilament lattice structure of muscle alters muscle function in a spatially explicit model | |
| 260 | |b Public Library of Science |c Apr 2025 | ||
| 513 | |a Journal Article | ||
| 520 | 3 | |a Crossbridge binding, state transitions, and force in active muscle is dependent on the radial spacing between the myosin-containing thick filament and the actin-containing thin filament in the filament lattice. This radial spacing has been previously shown through spatially explicit modeling and experimental efforts to greatly affect quasi-static, isometric, force production in muscle. It has recently been suggested that this radial spacing might also be able to drive differences in mechanical function, or net work, under dynamic oscillations like those which occur in muscles in vivo. However, previous spatially explicit models either had no radial spacing dependence, meaning the radial spacing could not be investigated, or did include radial spacing dependence but could not reproduce in vivo net work during dynamic oscillations and only investigated isometric contractions. Here we show the first spatially explicit model to include radial crossbridge dependence which can produce mechanical function similar to real muscle. Using this spatially explicit model of a half sarcomere, we show that when oscillated at strain amplitudes and frequencies like those in the main flight muscles of the hawkmoth Manduca sexta, mechanical function (net work) does depend on the lattice spacing. In addition, since the trajectory of lattice spacing changes during dynamic oscillation can vary from organism to organism, we can prescribe a trajectory of lattice spacing changes in the spatially explicit half sarcomere model and investigate the extent to which the time course of lattice spacing changes can affect mechanical function. We simulated a half sarcomere undergoing dynamic oscillations and prescribed the Poisson’s ratio of the lattice to be either 0 (constant lattice spacing) or 0.5 (isovolumetric lattice spacing changes). We also simulated net work using lattice spacing data taken from M. sexta which has a variable Poisson’s ratio. Our simulation results indicate that the lattice spacing can change the mechanical function of muscle, and that in some cases a 1 nm difference can switch the net work of the half sarcomere model from positive (motor-like) to negative (brake-like). | |
| 610 | 4 | |a National Science Foundation | |
| 653 | |a Oscillations | ||
| 653 | |a Muscles | ||
| 653 | |a Poisson's ratio | ||
| 653 | |a Myosin | ||
| 653 | |a Actin | ||
| 653 | |a Lattice theory | ||
| 653 | |a Muscle contraction | ||
| 653 | |a Force | ||
| 653 | |a Muscle function | ||
| 653 | |a In vivo methods and tests | ||
| 653 | |a Mechanical properties | ||
| 653 | |a Environmental | ||
| 700 | 1 | |a Sponberg, Simon | |
| 773 | 0 | |t PLoS Computational Biology |g vol. 21, no. 4 (Apr 2025), p. e1012862-e1012885 | |
| 786 | 0 | |d ProQuest |t Health & Medical Collection | |
| 856 | 4 | 1 | |3 Citation/Abstract |u https://www.proquest.com/docview/3270580275/abstract/embedded/H09TXR3UUZB2ISDL?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text |u https://www.proquest.com/docview/3270580275/fulltext/embedded/H09TXR3UUZB2ISDL?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text - PDF |u https://www.proquest.com/docview/3270580275/fulltextPDF/embedded/H09TXR3UUZB2ISDL?source=fedsrch |