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Biophysical Reviews

, Volume 10, Issue 4, pp 1187–1199 | Cite as

The multiple roles of titin in muscle contraction and force production

  • Walter Herzog
Review

Abstract

Titin is a filamentous protein spanning the half-sarcomere, with spring-like properties in the I-band region. Various structural, signaling, and mechanical functions have been associated with titin, but not all of these are fully elucidated and accepted in the scientific community. Here, I discuss the primary mechanical functions of titin, including its accepted role in passive force production, stabilization of half-sarcomeres and sarcomeres, and its controversial contribution to residual force enhancement, passive force enhancement, energetics, and work production in shortening muscle. Finally, I provide evidence that titin is a molecular spring whose stiffness changes with muscle activation and actin–myosin-based force production, suggesting a novel model of force production that, aside from actin and myosin, includes titin as a “third contractile” filament. Using this three-filament model of sarcomeres, the stability of (half-) sarcomeres, passive force enhancement, residual force enhancement, and the decrease in metabolic energy during and following eccentric contractions can be explained readily.

Keywords

Titin Molecular spring Mechanical functions Active/passive force regulation Muscle shortening Force production Cross-bridge theory Three filament sarcomere model Mechanisms of muscle contraction Muscle energetics 

Notes

Compliance with ethical standards

Conflict of interest

Walter Herzog declares that he has no conflict of interest.

Ethical approval

Ethics approvals for all experiments described in this study were obtained by the Life Sciences and Animal Research Ethics Commitee of the University of Calgary.

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© International Union for Pure and Applied Biophysics (IUPAB) and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Human Performance Laboratory, Faculty of KinesiologyUniversity of CalgaryCalgaryCanada

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