Skeletal muscle myofibrillogenesis as revealed with a monoclonal antibody to titin in combination with detection of the α- and γ-isoforms of actin

The distribution of titin during myofibrillogenesis was examined using rat skeletal muscle myogenic cultures and fluorescent-antibody staining. Efforts were made to compare the distribution and temporal sequence of incorporation of titin relative to that of the α- and γ-isoforms of actin. The presen...

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Veröffentlicht in:Developmental biology 1989-03, Vol.132 (1), p.35-44
Hauptverfasser: Handel, Susan E., Wang, Seu-Mei, Greaser, Marion L., Schultz, Edward, Bulinski, Jeannette C., Lessard, James L.
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Sprache:eng
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Zusammenfassung:The distribution of titin during myofibrillogenesis was examined using rat skeletal muscle myogenic cultures and fluorescent-antibody staining. Efforts were made to compare the distribution and temporal sequence of incorporation of titin relative to that of the α- and γ-isoforms of actin. The present observations suggested the following sequence of titin assembly: (1) newly synthesized titin molecules are distributed in a diffuse pattern throughout the sarcoplasm, (2) the titin molecules gradually associate with α- and γ-actin-positive stress fiber-like structures (SFLS), (3) groups of titin molecules begin to segregate on the SFLS, and (4) titin molecules align in a mature doublet configuration in the sarcomeres of nascent myofibrils. Titin assembly on the SFLS often appeared prior to the onset of either α- or γ-actin periodicity on nascent myofibrils; the latter result suggested a role for titin in sarcomeric organization. Actin distribution on SFLS and its periodicity on nascent myofibrils was usually identical between the α- and γ-isoforms. This suggested that γ-actin participated in myofibrillogenesis in a manner indistinguishable from that of α-actin. The transition seen from continuous actin staining of SFLS to the I-band staining pattern of mature myofibrils is discussed in relation to the corresponding reorganization of actin filaments and the molecular associations that this would entail.
ISSN:0012-1606
1095-564X
DOI:10.1016/0012-1606(89)90202-9