The effect of immobilization on myotendinous junction: An ultrastructural, histochemical and immunohistochemical study

P. Kannus, L. Józsa, M. Kvist, M. Lehto, M. Jarvinen

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49 Citations (Scopus)

Abstract

The effect of immobilization on the myotendinous junction of the calf muscles in the rat was studied histochemically, immunohistochemically and morphometrically with a transmission electron microscope. After 3 weeks of immobilization, the contact area between the muscle cells and tendineal collagen fibres was reduced by almost 50% in both type I (slow-twitch) and type II (fast-twitch) muscle fibres. The terminal finger-like processes of the muscle cells became shallow and cylindrical and cylindrical or were completely atrophied. Their basal membranes were slightly thickened. Histochemically, the most remarkable alteration in the myotendinous junction was the marked decrease in the sulphate containing glycosaminoglycans. In the basal lamina of the muscle fibres, the glycosaminoglycan and proteoglycan content was also reduced. Immunohistochemical analyses revealed that the amount of type III collagen was markedly increased on the myotendinous interface, but the amount and distribution of type I collagen was not affected by immobilization. These findings suggest that immobilization causes degenerative changes at the myotendinous junction, which, in turn, most likely decrease its tensile strength and may predispose it to rupture during activity.

Original languageEnglish
Pages (from-to)387-394
Number of pages8
JournalActa Physiologica Scandinavica
Volume144
Issue number3
Publication statusPublished - 1992

Fingerprint

Immobilization
Glycosaminoglycans
Muscle Cells
Fast-Twitch Muscle Fibers
Muscles
Collagen Type III
Tensile Strength
Proteoglycans
Collagen Type I
Basement Membrane
Sulfates
Rupture
Collagen
Electrons
Membranes

Keywords

  • Histochemistry
  • Immobilization
  • Immunohistochemistry
  • Myotendinous junction
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Physiology

Cite this

The effect of immobilization on myotendinous junction : An ultrastructural, histochemical and immunohistochemical study. / Kannus, P.; Józsa, L.; Kvist, M.; Lehto, M.; Jarvinen, M.

In: Acta Physiologica Scandinavica, Vol. 144, No. 3, 1992, p. 387-394.

Research output: Contribution to journalArticle

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