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Mol Cell Biol, August 1998, p. 4744-4751, Vol. 18, No. 8
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Cytoskeletal Reorganization by G Protein-Coupled
Receptors Is Dependent on Phosphoinositide 3-Kinase
, a Rac
Guanosine Exchange Factor, and Rac
Alice D.
Ma,1
Ara
Metjian,1
Shubha
Bagrodia,2
Stephen
Taylor,3 and
Charles
S.
Abrams1 *
Department of Medicine, University of
Pennsylvania Medical School, Philadelphia,
Pennsylvania,1 and
Department of
Pharmacology2 and
Section of
Biochemistry, Molecular and Cell Biology,3
Cornell University College of Veterinary Medicine, Ithaca, New York
Received 29 December 1997/Returned for modification 12 February
1998/Accepted 11 May 1998
Reorganization of the actin cytoskeleton is an early cellular
response to a variety of extracellular signals. Dissection of pathways
leading to actin rearrangement has focused largely on those initiated
by growth factor receptors or integrins, although stimulation of G
protein-coupled receptors also leads to cytoskeletal changes. In
transfected Cos-7SH cells, activation of the chemoattractant formyl
peptide receptor induces cortical actin polymerization and a decrease
in the number of central actin bundles. In this report, we show that
cytoskeletal reorganization can be transduced by G protein 
heterodimers (G
), phosphoinositide 3-kinase
(PI3-K
), a guanosine exchange factor (GEF) for Rac, and Rac. Expression of inactive variants of either PI3-K
,
the Rac GEF Vav, or Rac blocked the actin rearrangement. Neither
wortmannin nor LY294002, pharmacologic inhibitors of PI3-K, could
inhibit the actin rearrangement induced by a constitutively active Rac. The inhibition of cytoskeletal reorganization by the dominant negative
Vav variants could be rescued by coexpression of a constitutively active form of Rac. In contrast, a Vav variant with its pleckstrin homology (PH) domain missing constitutively induced JNK activation and
led to cytoskeletal reorganization, even without stimulation by
PI3-K
. This suggests that the PH domain of Vav controls the guanosine exchange activity of Vav, perhaps by a mechanism regulated by D3 phosphoinositides generated by PI3-K. Taken together, these findings delineate a pathway leading from activation of a G
protein-coupled receptor to actin reorganization which sequentially involves G
, PI3-K
, a Rac GEF, and Rac.
*
Corresponding author. Mailing address:
Hematology-Oncology Division, University of Pennsylvania, Stellar
Chance Labs no. 1005, 422 Curie Blvd., Philadelphia, PA 19104. Phone:
(215) 898-1058. Fax: (215) 573-7400. E-mail:
abramsc{at}mail.med.upenn.edu.
Mol Cell Biol, August 1998, p. 4744-4751, Vol. 18, No. 8
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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