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Molecular and Cellular Biology, February 1999, p. 1081-1091, Vol. 19, No. 2
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

An SH2 Domain-Containing 5' Inositolphosphatase Inhibits Insulin-Induced GLUT4 Translocation and Growth Factor-Induced Actin Filament Rearrangement

Peter Vollenweider,1 Martin Clodi,1 Stuart S. Martin,1 Takeshi Imamura,1 W. Michael Kavanaugh,2 and Jerrold M. Olefsky1,*

Department of Medicine, University of California, San Diego, La Jolla, California 92093,1 and Chiron Corporation, Emeryville, California 946082

Received 27 July 1998/Returned for modification 26 August 1998/Accepted 28 October 1998

Tyrosine kinase receptors lead to rapid activation of phosphatidylinositol 3-kinase (PI3 kinase) and the subsequent formation of phosphatidylinositides (PtdIns) 3,4-P2 and PtdIns 3,4,5-P3, which are thought to be involved in signaling for glucose transporter GLUT4 translocation, cytoskeletal rearrangement, and DNA synthesis. However, the specific role of each of these PtdIns in insulin and growth factor signaling is still mainly unknown. Therefore, we assessed, in the current study, the effect of SH2-containing inositol phosphatase (SHIP) expression on these biological effects. SHIP is a 5' phosphatase that decreases the intracellular levels of PtdIns 3,4,5-P3. Expression of SHIP after nuclear microinjection in 3T3-L1 adipocytes inhibited insulin-induced GLUT4 translocation by 100 ± 21% (mean ± the standard error) at submaximal (3 ng/ml) and 64 ± 5% at maximal (10 ng/ml) insulin concentrations (P < 0.05 and P < 0.001, respectively). A catalytically inactive mutant of SHIP had no effect on insulin-induced GLUT4 translocation. Furthermore, SHIP also abolished GLUT4 translocation induced by a membrane-targeted catalytic subunit of PI3 kinase. In addition, insulin-, insulin-like growth factor I (IGF-I)-, and platelet-derived growth factor-induced cytoskeletal rearrangement, i.e., membrane ruffling, was significantly inhibited (78 ± 10, 64 ± 3, and 62 ± 5%, respectively; P < 0.05 for all) in 3T3-L1 adipocytes. In a rat fibroblast cell line overexpressing the human insulin receptor (HIRc-B), SHIP inhibited membrane ruffling induced by insulin and IGF-I by 76 ± 3% (P < 0.001) and 68 ± 5% (P < 0.005), respectively. However, growth factor-induced stress fiber breakdown was not affected by SHIP expression. Finally, SHIP decreased significantly growth factor-induced mitogen-activated protein kinase activation and DNA synthesis. Expression of the catalytically inactive mutant had no effect on these cellular responses. In summary, our results show that expression of SHIP inhibits insulin-induced GLUT4 translocation, growth factor-induced membrane ruffling, and DNA synthesis, indicating that PtdIns 3,4,5-P3 is the key phospholipid product mediating these biological actions.

* Corresponding author. Mailing address: Department of Medicine (0673), University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0673. Phone: (619) 534-6651. Fax: (619) 534-6653. E-mail: jolefsky{at}ucsd.edu.

Molecular and Cellular Biology, February 1999, p. 1081-1091, Vol. 19, No. 2
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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