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Overexpression of lumican affects the migration of human colon cancer cells through up-regulation of gelsolin and filamentous actin reorganization.

Abstract
Cell migration is a multistep process initiated by extracellular matrix components that leads to cytoskeletal changes and formation of different protrusive structures at the cell periphery. Lumican, a small extracellular matrix leucine-rich proteoglycan, has been shown to inhibit human melanoma cell migration by binding to α2β1 integrin and affecting actin cytoskeleton organization. The aim of this study was to determine the effect of lumican overexpression on the migration ability of human colon adenocarcinoma LS180 cells. The cells stably transfected with plasmid containing lumican cDNA were characterized by the increased chemotactic migration measured on Transwell filters. Lumican-overexpressing cells presented the elevated filamentous to monomeric actin ratio and gelsolin up-regulation. This was accompanied by a distinct cytoskeletal actin rearrangement and gelsolin subcellular relocation, as observed under laser scaning confocal microscope. Moreover, LS180 cells overexpressing lumican tend to form podosome-like structures as indicated by vinculin redistribution and its colocalization with gelsolin and actin at the submembrane region of the cells. In conclusion, the elevated level of lumican secretion to extracellular space leads to actin cytoskeletal remodeling followed by an increase in migration capacity of human colon LS180 cells. These data suggest that lumican expression and its presence in ECM has an impact on colon cancer cells motility and may modulate invasiveness of colon cancer.
AuthorsAgata Radwanska, Monika Litwin, Dorota Nowak, Dagmara Baczynska, Yanusz Wegrowski, Francois-Xavier Maquart, Maria Malicka-Blaszkiewicz
JournalExperimental cell research (Exp Cell Res) Vol. 318 Issue 18 Pg. 2312-23 (Nov 01 2012) ISSN: 1090-2422 [Electronic] United States
PMID22814255 (Publication Type: Journal Article)
CopyrightCopyright © 2012 Elsevier Inc. All rights reserved.
Chemical References
  • Actins
  • Chondroitin Sulfate Proteoglycans
  • Gelsolin
  • LUM protein, human
  • Lumican
  • Keratan Sulfate
Topics
  • Actin Cytoskeleton (metabolism)
  • Actins (genetics, metabolism)
  • Cell Line, Tumor
  • Cell Movement
  • Chondroitin Sulfate Proteoglycans (genetics, metabolism)
  • Colonic Neoplasms
  • Gelsolin (genetics)
  • Humans
  • Keratan Sulfate (genetics, metabolism)
  • Lumican
  • Transfection
  • Up-Regulation

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