Structural diversity in muscle fibres of chicken breast

Research output: Contribution to journalArticle

Abstract

Chicken breast muscle is usually considered to be a relatively homogeneous white muscle and has therefore been widely used for studies of muscle proteins. In a previous study, however, we have found different M-region structures in different fibres from this muscle. Because of this result, we have now carried out a combined histochemical and ultrastructural survey of this muscle. In particular, we have made use of large transverse cryo-sections that include most of the muscle cross-section. Although the white region is fairly homogeneous in fibre content according to normal histochemical criteria (mATPase), we have found that there is a gradation of fibre structure across the muscle. The bulk of the muscle stains conventionally for Type-II fibres according to mATPase tests (the "white" part) but, in the small "red" part of the muscle, there are also Type-I fibres together with the Type-II fibres. Superimposed on this division into Type-I and Type-II fibres are variations in fibre size, oxidative and glycolytic staining properties, and variations of Z-band width and M-band structure; there is no strict correlation among any of these parameters. The apparently uniform staining across most of the muscle when tested for myofibrillar ATPase may be a misleading indicator of fibre properties.

Details

Authors
  • Anne-Christine Edman
  • Jan Lexell
  • Michael Sjöstrom
  • John M Squire
External organisations
  • External Organization - Unknown
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Cell Biology

Keywords

  • Striated skeletal muscle, Chicken, Myofibril, Muscle cells, Fibre types
Original languageEnglish
Pages (from-to)281-289
JournalCell and Tissue Research
Volume251
Issue number2
Publication statusPublished - 1988
Publication categoryResearch
Peer-reviewedYes
Externally publishedYes