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Related Experiment Videos

Microfilament-membrane interactions in Xenopus myocytes

S J Samuelsson1, P W Luther, R J Bloch

  • 1Department of Physiology, University of Maryland School of Medicine, Baltimore, USA.

Cell Motility and the Cytoskeleton
|January 1, 1996
PubMed
Summary

Actin microfilaments interact with the sarcolemma in Xenopus myocytes via focal contacts and a unique lattice-like array. This widespread association involves vinculin, talin, and beta 1-integrin, distinct from focal contacts.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Molecular Biology

Background:

  • The cytoplasmic surface of the sarcolemma in muscle cells is crucial for mechanical coupling and signaling.
  • Understanding the molecular organization of actin filaments at the sarcolemma is key to elucidating muscle function.

Purpose of the Study:

  • To determine the molecular organization of microfilaments at the cytoplasmic surface of the sarcolemma in Xenopus myocytes.
  • To investigate the distinct ways actin microfilaments interact with the sarcolemma.

Main Methods:

  • Quick-freeze, deep-etch, rotary-replication transmission electron microscopy (TEM).
  • Immunogold cytochemistry using antibodies against vinculin, talin, and beta 1-integrin.

Main Results:

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  • Actin microfilaments interact with the sarcolemma in two distinct patterns: focal contact-like structures and an extensive, lattice-like array.
  • Both interaction types involve aggregates of membrane-associated particles containing vinculin, talin, and beta 1-integrin.
  • The lattice-like array covers most of the sarcolemma, suggesting a widespread association distinct from focal contacts.

Conclusions:

  • Xenopus myocytes exhibit a unique, lattice-like organization of actin microfilaments across the sarcolemma.
  • This organization mediates widespread associations of the actin cytoskeleton with the cytoplasmic membrane face.
  • The findings reveal a novel mechanism for actin-sarcolemma interaction in muscle cells.