Mechanisms of amoeboid chemotaxis: An evaluation of the cortical expansion model

John S. Condeelis, Anne R. Bresnick, M. Demma, S. Dharmawardhane, Robert J. Eddy, A. L. Hall, R. Sauterer, V. Warren

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

In this work we evaluate the cortical expansion model for amoeboid chemotaxis with regard to new information about molecular events in the cytoskeleton following chemotactic stimulation of Dictyostelium amoebae. A rapid upshift in the concentration of chemoattractant can be used to synchronize the motile behavior of a large population of cells. This synchrony presents an opportunity to study the biochemical basis of morphological changes such as pseudopod extension that are required for amoeboid chemotaxis. Changes in the composition and activity of the cytoskeleton following stimulation can be measured with precision and correlated with important morphological changes. Such studies demonstrate that activation of actin nucleation is one of the first and most crucial events in the actin cytoskeleton following stimulation. This activation is followed by incorporation of specific actin cross-linking proteins into the cytoskeleton, which are implicated in the extension of pseudopods and filopods. These results, as well as those from studies with mutants deficient in myosin, indicate that cortical expansion, driven by focal actin polymerization, cross-linking and gel osmotic swelling, is an important force for pseudopod extension. It is concluded that whereas three forces, frontal sliding, tail contraction, and cortical expansion may cooperate to produce amoeboid movement, the cortical expansion model offers the simplest explanation of how focal stimulation with a chemoattractant causes polarized pseudopod extension.

Original languageEnglish (US)
Pages (from-to)333-340
Number of pages8
JournalDevelopmental Genetics
Volume11
Issue number5
DOIs
StatePublished - 1990

Fingerprint

Pseudopodia
Chemotaxis
Cytoskeleton
Actins
Chemotactic Factors
Amoeba
Dictyostelium
Myosins
Actin Cytoskeleton
Polymerization
Gels
Population
Proteins

Keywords

  • ABP-120
  • actin
  • Dictyostelium discoideum
  • elongation factor 1 alpha

ASJC Scopus subject areas

  • Developmental Biology
  • Cell Biology
  • Genetics

Cite this

Mechanisms of amoeboid chemotaxis : An evaluation of the cortical expansion model. / Condeelis, John S.; Bresnick, Anne R.; Demma, M.; Dharmawardhane, S.; Eddy, Robert J.; Hall, A. L.; Sauterer, R.; Warren, V.

In: Developmental Genetics, Vol. 11, No. 5, 1990, p. 333-340.

Research output: Contribution to journalArticle

Condeelis, John S. ; Bresnick, Anne R. ; Demma, M. ; Dharmawardhane, S. ; Eddy, Robert J. ; Hall, A. L. ; Sauterer, R. ; Warren, V. / Mechanisms of amoeboid chemotaxis : An evaluation of the cortical expansion model. In: Developmental Genetics. 1990 ; Vol. 11, No. 5. pp. 333-340.
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