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Role of the actin cytoskeleton in store-mediated calcium entry in glioma C6 cells.

Abstract
The effects of actin cytoskeleton disruption by cytochalasin D and latrunculin A on Ca2+ signals evoked by ADP, UTP or thapsigargin were investigated in glioma C6 cells. Despite the profound alterations of the actin cytoskeleton architecture and cell morphology, ADP and UTP still produced cytosolic calcium elevation in this cell line. However, calcium mobilization from internal stores and Ca2+ influx through store-operated Ca2+ channels induced by ADP and UTP were strongly reduced. Cytochalasin D and latrunculin A also diminished extracellular Ca2+ influx in unstimulated glioma C6 cells previously incubated in Ca2+ free buffer. In contrast, the disruption of the actin cytoskeleton had no effect on thapsigargin-induced Ca2+ influx in this cell line. Both agonist- and thapsigargin-generated Ca2+ entry was significantly decreased by the blocker of store-operated Ca2+ channels, 2-aminoethoxydiphenylborate. The data reveal that two agonists and thapsigargin activate store-operated Ca2+ channels but the mechanism of activation seems to be different. While the agonists evoke a store-mediated Ca2+ entry that is dependent on the actin cytoskeleton, thapsigargin apparently activates an additional mechanism, which is independent of the disruption of the cytoskeleton.
AuthorsPawelz Sabała, Berenika Targos, Antonella Caravelli, Rafał Czajkowski, Dmitri Lim, Gianni Gragnaniello, Luigia Santella, Jolanta Barańska
JournalBiochemical and biophysical research communications (Biochem Biophys Res Commun) Vol. 296 Issue 2 Pg. 484-91 (Aug 16 2002) ISSN: 0006-291X [Print] United States
PMID12163045 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Actins
  • Bridged Bicyclo Compounds, Heterocyclic
  • Chelating Agents
  • Enzyme Inhibitors
  • Fluorescent Dyes
  • Nucleic Acid Synthesis Inhibitors
  • Thiazoles
  • Thiazolidines
  • Cytochalasin D
  • Adenosine Diphosphate
  • Thapsigargin
  • latrunculin A
  • Calcium
  • Fura-2
  • Uridine Triphosphate
Topics
  • Actins (metabolism)
  • Adenosine Diphosphate (metabolism)
  • Animals
  • Bridged Bicyclo Compounds, Heterocyclic (pharmacology)
  • Calcium (metabolism)
  • Calcium Signaling (physiology)
  • Chelating Agents (metabolism)
  • Cytochalasin D (pharmacology)
  • Cytoskeleton (metabolism)
  • Enzyme Inhibitors (pharmacology)
  • Fluorescent Dyes (metabolism)
  • Fura-2 (metabolism)
  • Glioma
  • Microscopy, Confocal
  • Nucleic Acid Synthesis Inhibitors (pharmacology)
  • Rats
  • Thapsigargin (pharmacology)
  • Thiazoles (pharmacology)
  • Thiazolidines
  • Tumor Cells, Cultured
  • Uridine Triphosphate (metabolism)

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