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Untersuchungen über das Längenwachstum der Skelettmuskulatur von Fischen

Investigations on the longitudinal growth of fish skeletal muscle

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Summary

Longitudinal growth of myofibrils in the skeletal muscle of Macropodus opercularis appears to take place at their terminal parts. Since the Z-disks are arranged in lines and perpendicularly to the longitudinal axis, there are repeated terminal myofibril regions of different lengths following the last complete sarcomere. At the shortest terminal myofibril region, which is apparently the youngest one, ribosome concentration is very high. In the adjacent terminal regions of greater length, which probably represent older ones, actin filaments can be detected among the ribosomes. As soon as the terminal myofibril region approaches the full sarcomere length, the concentration of ribosomes is found to be reduced and the number of filaments increased. At this stage the first myosin filaments are clearly observed among actin filaments. Therefore, during longitudinal growth myosin filaments morphologically appear after the formation of actin filaments, whereas during myofibrillogenesis in the same muscle both types appear simultaneously in the differentiating sarcomere. After the arrangement of actin and myosin filaments into the A- and I-bands, a new Z-disk is formed in close contact with the sarcolemma and gradually detached over its entire length from the inclined cell membrane.

The problem of tension transmission via the undifferentiated terminal myofibril regions is discussed in relation to these findings.

Zusammenfassung

Ein Längenwachstum der Myofibrillen erscheint an terminalen, an das Interstitium grenzenden Myofibrillenabschnitten möglich. Diese Myofibrillenabschnitte weisen unterschiedliche Längen auf. Am kleinsten terminalen Myofibrillenabschnitt ist die Ribosomenkonzentration am höchsten. Mit zunehmender Verlängerung des Abschnittes erkennt man Aktinfilamente, die zwischen den dicht gelagerten Ribosomen liegen. Erreicht der terminale Myofibrillenabschnitt etwa die Länge einer Sarkomere, hat die Ribosomenkonzentration abgenommen, die Filamentanzahl zugenommen. In diesem Stadium treten zwischen den Aktinfilamenten erste Myosinfilamente auf. Eine neue Z-Scheibe entsteht in engem Kontakt mit dem Sarkolemm. Letztere löst sich nach und nach über ihre ganze Länge von der stets schräg ansetzenden Zellmembran. Die Frage nach der Spannungsübertragung an undifferenzierten terminalen Myofibrillenabschnitten wird diskutiert.

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  1. Institut für Cytologie und Mikromorphologie der Universität Bonn, Germany

    Peter-Joachim Schattenberg

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Schattenberg, PJ. Untersuchungen über das Längenwachstum der Skelettmuskulatur von Fischen. Z.Zellforsch 143, 587–596 (1973). https://doi.org/10.1007/BF00306775

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