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Cell and Tissue Research

, Volume 264, Issue 3, pp 577–587 | Cite as

Myofibrillar and cytoskeletal assembly in neonatal rat cardiac myocytes cultured on laminin and collagen

  • Lula L. Hilenski
  • Louis Terracio
  • Thomas K. Borg
Article

Summary

Neonatal rat cardiomyocytes were cultured on extracellular matrix components laminin and collagens I+III to examine effects of extracellular matrix on the assembly of cytoskeletal proteins during myofibrillogenesis. Myofibril assembly was visualized by immunofluorescence of marker proteins for myofibrils (f-actin for I bands and α-actinin for Z bands), focal adhesions (vinculin), and transmembrane extracellular matrix receptors (β1 integrin) as cells spread for various times in culture. By 4 h in culture, f-actin appeared organized into nonstriated stress-fiber-like structures while α-actinin, vinculin and β1 integrin were localized in small streaks and beads. Subsequently, striated patterns were observed sequentially in the intracellular cytoskeletal components α-actinin, vinculin, f-actin, and then in the transmembrane β1 integrin receptor. These data support an earlier model for sarcomerogenesis in which stress-fiber-like structures serve as initial scaffolds upon which α-actinin and then vinculin-containing costameres are assembled. This sequential and temporal assembly was the same on both laminin and collagens I+III. A quantitative difference, however, was apparent on the 2 matrices. There was an increased appearance on collagens I+III of rosettes (also called podosomes or cortical actin-containing bodies in other cells) which consisted of an f-actin core surrounded by α-actinin, vinculin and β1 integrin rims. The increased incidence of rosettes in neonatal myocytes on collagens I+III suggests that these cytoskeletal complexes are involved in recognition and interaction with extracellular matrix components.

Key words

Myofibrils Cytoskeleton Extracellular matrix Laminin Collage Actin filaments Vinculin-Rat 

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • Lula L. Hilenski
    • 1
  • Louis Terracio
    • 2
  • Thomas K. Borg
    • 1
  1. 1.Department of PathologyUniversity of South CarolinaColumbiaUSA
  2. 2.Department of Anatomy, Cell Biology and NeurosciencesUniversity of South CarolinaColumbiaUSA

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