The function of intermediate filaments in cell shape and cytoskeletal integrity

Robert D. Goldman*, Satya Khuon, Ying Hao Chou, Puneet Opal, Peter M. Steinert

*Corresponding author for this work

Research output: Contribution to journalArticle

282 Scopus citations

Abstract

This study describes the development and use of a specific method for disassembling intermediate filament (IF) networks in living cells. It takes advantage of the disruptive effects of mimetic peptides derived from the amino acid sequence of the helix initiation 1A domain of IF protein chains. The results demonstrate that at 1:1 molar ratios, these peptides disassemble vimentin IF into small oligomeric complexes and monomers within 30 min at room temperature in vitro. Upon microinjection into cultured fibroblasts, these same peptides induce the rapid disassembly of IF networks. The disassembly process is accompanied by a dramatic alteration in cell shape and the destabilization of microtubule and actin-stress fiber networks. These changes in cell shape and IF assembly states are reversible. The results are discussed with respect to the roles of IF in cell shape and the maintenance of the integrity and mechanical properties of the cytoplasm, as well as the stability of the other major cytoskeletal systems.

Original languageEnglish (US)
Pages (from-to)971-983
Number of pages13
JournalJournal of Cell Biology
Volume134
Issue number4
DOIs
StatePublished - Aug 1996

ASJC Scopus subject areas

  • Cell Biology

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