, Volume 97, Issue 4, pp 361–370 | Cite as

Heterogeneity and distribution of fast myosin heavy chains in some adult vertebrate skeletal muscles

  • K. Williams
  • G. K. Dhoot


Three monoclonal antibodies, LM5, F2 and F39 raised to chicken fast skeletal muscle myosin, specific for myosin heavy chain (MHC) subunit, were used to study the composition and distribution of this protein in some vertebrate skeletal muscles. These antibodies in immunohistochemical investigations did not react with the majority of the type I fibres in most muscles. Antibodies LM5 and F39 stained all the type II fibres in all the adult chicken skeletal muscles studied. Antibody F2 also stained all the type II fibres in most chicken skeletal muscles tested except in gastrocnemius in which a proportion of both the type IIA and IIB fibres either did not stain or stained only weakly. Antibody F2 unlike LM5 and F39 stained most of the type IIIB fibres in anterior latissimus dorsi (ALD) and IB fibres in red strip of chicken Pectoralis muscle. Antibodies LM5 and F2 in the rat diaphragm reacted with all the type IIA and IIB fibres, while antibody F39 stained only the type IIB fibres darkly with most IIA fibres being either not stained or only weakly stained. In the rat extensor digitorum longus (EDL) and tibialis anterior (TA) muscles, antibody LM5 stained all the IIA and IIB fibres. Antibody F2 in these muscles stained all the type IIA fibres but only a proportion of the IIB fibres. The remaining IIB fibres were either unstained or only weakly positive. Antibody F39 in rat EDL and TA muscles did not only distinguish subgroups of IIB fibres (dark, intermediate and negative or very weak) but also of the IIA fibres. These three antibodies used together therefore detected a great deal of heterogeneity in the myosin heavy chain composition and muscle fibre types of several skeletal muscles.


Myosin Heavy Chain Tibialis Anterior Extensor Digitorum Longus Skeletal Muscle Myosin Vertebrate Skeletal Muscle 
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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • K. Williams
    • 1
  • G. K. Dhoot
    • 1
  1. 1.Department of Basic SciencesThe Royal Veterinary CollegeLondonUK

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