EGF-stimulated lamellipod extension in adenocarcinoma cells

Christian Rotsch, Ken Jacobson, John Condeelis, Manfred Radmacher

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


The extension of lamellipodia has been triggered by the application of epidermal growth factor (EGF). We have used an atomic force microscope (AFM) to investigate this lamellipodial extension. During extension we could detect an increase in height from about 500nm for the stable lamellipodium to typical values of 600-800nm for the extending lamellipodium. The AFM was also used to determine the mechanical properties of the lamellipodium where we found a decrease of the elastic modulus by a factor of 1.4 at the same location within the same cell. Both findings are consistent with the cortical expansion hypothesis, suggesting that severing of actin filaments, leading to a swelling of the cytoskeleton, generates the protrusive force during lamellipodial extension.

Original languageEnglish (US)
Pages (from-to)97-106
Number of pages10
Issue number1-2
StatePublished - 2001


  • AFM
  • Chemotaxis
  • EGF
  • Elasticity
  • MTLn3

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation


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