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J. Biol. Chem., Vol. 275, Issue 47, 36999-37005, November 24, 2000
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From the Department of Pathology, Brigham and Women's Hospital and
Harvard Medical School, Boston, Massachusetts 02115
E-cadherin is a transmembrane protein that
mediates Ca2+-dependent cell-cell
adhesion. Cdc42, a member of the Rho family of small GTPases,
participates in cytoskeletal rearrangement and cell cycle progression.
Recent evidence reveals that members of the Rho family modulate
E-cadherin function. To further examine the role of Cdc42 in
E-cadherin-mediated cell-cell adhesion, we developed an assay for
active Cdc42 using the GTPase-binding domain of the
Wiskott-Aldrich syndrome protein. Initiation of E-cadherin-mediated cell-cell attachment significantly increased in a
time-dependent manner the amount of active Cdc42 in MCF-7
epithelial cell lysates. By contrast, Cdc42 activity was not increased
under identical conditions in MCF-7 cells incubated with
anti-E-cadherin antibodies nor in MDA-MB-231 (E-cadherin negative)
epithelial cells. By fusing the Wiskott-Aldrich syndrome
protein/GTPase-binding domain to a green fluorescent protein,
activation of endogenous Cdc42 by E-cadherin was demonstrated in live
cells. These data indicate that E-cadherin activates Cdc42,
demonstrating bi-directional interactions between the Rho- and
E-cadherin signaling pathways.
E-cadherin-mediated Cell-Cell Attachment Activates Cdc42*
*
This work was supported in part by National Institutes of
Health Grant CA75205.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
To whom correspondence should be addressed: Brigham and
Women's Hospital, Thorn 530, 75 Francis St., Boston, MA
02115. Tel.: 617-732-6627; Fax: 617-278-6921; E-mail:
dsacks@rics.bwh.harvard.edu.
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