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Patterns of troponin T expression in mammalian fast, slow and promiscuous muscle fibres

Summary

The distribution of troponin T(TnT) species in typed single muscle fibres was analysed using one- and two-dimensional polyacrylamide gel electrophoresis (PAGE) and a monoclonal antibody specific for fast TnT. Fibres taken from erector spinae (Es), plantaris (Plt), diaphragm (Dia) and soleus (Sol) muscles of adult rabbits were pretyped as fast-twitch-glycolytic (FG), fast-twitch-oxidative-glycolytic (FOG), slow-twitch-oxidative (SO) or promiscuous (P) using a combination of histochemical staining and PAGE. Although none of the four size classes of TnT was either muscle or fibre type specific, their pattern of expression differed in each muscle and between the fibre types. FG fibres expressed TnT1f or TnT2f as predominant species, depending on the muscle; TnT3f and TnT4f were minor components. In contrast, all size classes of TnT were expressed in varying proportions in FOG fibres from Es and Plt, while those from Dia resembled FG fibres, expressing TnT1f as their major species. P fibres from Es, Plt, and Sol exhibited a distinctive pattern of fast TnT expression, TnT3f being the predominant species. Dia differed from the other muscles as TnT1f was the dominant fast TnT species in its P fibres as it is in the Dia fast fibres. Quantitative analysis of one- and two-dimensional gels revealed that the P fibres could be divided into two classes, those that exhibited discoordinate expression of fast and slow TnTs, myosin light chains and myosin heavy chains and those in which their expression was coordinate. In addition low levels of TnT4f were detected in SO fibres and of slow TnT in fast fibres.

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Moore, G.E., Briggs, M.M. & Schachat, F.H. Patterns of troponin T expression in mammalian fast, slow and promiscuous muscle fibres. J Muscle Res Cell Motil 8, 13–22 (1987). https://doi.org/10.1007/BF01767260

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Keywords

  • Light Chain
  • Size Classis
  • Fibre Type
  • Myosin Heavy Chain
  • Myosin Light Chain