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Cdc42 regulates arsenic-induced NADPH oxidase activation and cell migration through actin filament reorganization.

Authors
Qian-Y; Liu-KJ; Chen-Y; Flynn-DC; Castranova-V; Shi-X
Source
J Biol Chem 2005 Feb; 280(5):3875-3884
NIOSHTIC No.
20025898
Abstract
Although arsenic is a human carcinogen, the molecular mechanisms of its action remain to be understood. The present study reports that exposure to arsenic induced actin filament reorganization, resulting in lamellipodia and filopodia structures through the activation of Cdc42 in SVEC4-10 endothelial cells. It was also found that arsenic induced the formation of superoxide anion (O2.-) in SVEC4-10 cells. Immunoprecipitation and western blotting analysis demonstrated that arsenic stimulation induced serine phosphorylation of p47phox, a key component of NADPH oxidase, indicating that arsenic induces O2.- formation through NADPH oxidase activation. Inhibition of arsenic-induced actin filament reorganization by either overexpression of a dominant negative Cdc42 or pretreatment of an actin filament stabilizing regent, jasplakinolide, abrogated arsenic-induced NADPH oxidase activation, showing that the activation of NADPH oxidase was regulated by Cdc42-mediated actin filament reorganization. This study also showed that overexpression of a dominant negative Rac1 was sufficient to abolish arsenic-induced O2.- production, implying that Rac1 activities are required for Cdc42-mediated NADPH oxidase activation in response to arsenic stimulation. Furthermore, arsenic stimulation induced cell migration, which can be inhibited by inactivation of either Cdc42 or NADPH oxidase. Taken together, the results indicate that arsenic is able to activate NADPH oxidase through Cdc42-mediated actin filament reorganization, leading to the induction of an increase in cell migration in SVEC4-10 endothelial cells.
Keywords
Cell-migration; Arsenic-compounds; Carcinogens; Exposure-levels; Exposure-assessment; Cell-function; Cellular-structures
CODEN
JBCHA3
CAS No.
7440-38-2
Publication Date
20050204
Document Type
Journal Article
Email Address
YAQ2@CDC.GOV
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Issue of Publication
5
ISSN
0021-9258
NIOSH Division
HELD
Priority Area
Research Tools and Approaches: Cancer Research Methods
Source Name
Journal of Biological Chemistry
State
WV; NM; IN
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