Dynamic microtubules regulate the local concentration of E-cadherin at cell-cell contacts

J Cell Sci. 2006 May 1;119(Pt 9):1801-11. doi: 10.1242/jcs.02903. Epub 2006 Apr 11.

Abstract

In contrast to the well-established relationship between cadherins and the actin cytoskeleton, the potential link between cadherins and microtubules (MTs) has been less extensively investigated. We now identify a pool of MTs that extend radially into cell-cell contacts and are inhibited by manoeuvres that block the dynamic activity of MT plus-ends (e.g. in the presence of low concentrations of nocodazole and following expression of a CLIP-170 mutant). Blocking dynamic MTs perturbed the ability of cells to concentrate and accumulate E-cadherin at cell-cell contacts, as assessed both by quantitative immunofluorescence microscopy and fluorescence recovery after photobleaching (FRAP) analysis, but did not affect either transport of E-cadherin to the plasma membrane or the amount of E-cadherin expressed at the cell surface. This indicated that dynamic MTs allow cells to concentrate E-cadherin at cell-cell contacts by regulating the regional distribution of E-cadherin once it reaches the cell surface. Importantly, dynamic MTs were necessary for myosin II to accumulate and be activated at cadherin adhesive contacts, a mechanism that supports the focal accumulation of E-cadherin. We propose that this population of MTs represents a novel form of cadherin-MT cooperation, where cadherin adhesions recruit dynamic MTs that, in turn, support the local concentration of cadherin molecules by regulating myosin II activity at cell-cell contacts.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antineoplastic Agents / metabolism
  • CHO Cells
  • Cadherins / metabolism*
  • Cell Adhesion / physiology
  • Cell Line, Tumor
  • Cricetinae
  • Cricetulus
  • Fluorescence Recovery After Photobleaching
  • Humans
  • Intercellular Junctions / metabolism*
  • Microtubule-Associated Proteins / genetics
  • Microtubule-Associated Proteins / metabolism
  • Microtubules / metabolism*
  • Microtubules / ultrastructure
  • Myosin Type II / metabolism
  • Neoplasm Proteins / genetics
  • Neoplasm Proteins / metabolism
  • Nocodazole / metabolism
  • Recombinant Fusion Proteins / genetics
  • Recombinant Fusion Proteins / metabolism

Substances

  • Antineoplastic Agents
  • Cadherins
  • Microtubule-Associated Proteins
  • Neoplasm Proteins
  • Recombinant Fusion Proteins
  • cytoplasmic linker protein 170
  • Myosin Type II
  • Nocodazole