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Tetraspanin CD81 is linked to ERK/MAPKinase signaling by Shc in liver tumor cells

Abstract

Tetraspanins is a large family of membrane proteins that are implicated in cell proliferation, differentiation and tumor invasion. Specifically, the tetraspanin CD81 has been involved in cell proliferation but the mechanism is unknown. Here, we show that CD81 clustering stimulates ERK/MAPKinase activity and tyrosine phosphorylation of the adapter protein Shc in Huh7 cancer cells. In addition, overexpression of CD81 in HepG2 cells, NIH3T3 cells, and murine fibroblasts GD25 lacking the β1 family of integrins induces cell proliferation and ERK/MAPKinase activation. Linked with this event, we observed an increase in CD81-associated type II phosphatidylinositol 4-kinase activity. A mutant in the PTB domain of Shc failed to interact with phosphoinositides and localize to the plasma membrane thus blocking CD81-induced ERK/MAPKinase activation. Therefore, we conclude that CD81 stimulates synthesis of phosphoinositides with the recruitment of Shc to the plasma membrane via PTB domain, and this sequence of events induces activation of ERK/MAPKinase. These findings define a novel mechanism of ERK/MAPKinase activation and tumor cell proliferation.

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Abbreviations

PtdIns:

phosphatidylinositol

PtdIns 4-kinase:

phosphatidylinositol 4-kinase

PH:

pleckstrin homology

PTB:

phosphotyrosine binding

GST:

glutathione S-transferase

PAGE:

polyacrylamide gel electrophoresis

PIP:

phosphatidylinositol monophosphate

ERK:

extracellular-regulated kinase

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Acknowledgements

We thank Piero Pileri for generously providing expression plasmid for CD81 and Reinhard Fassler for GD25 cell line. We also thank Fedor Berditchevski for providing antibodies. This work was supported by grants from Ministero Italiano dell'Università e della Ricerca Scientifica e Tecnologica (MIUR)

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Correspondence to Vinicio Carloni.

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Carloni, V., Mazzocca, A. & Ravichandran, K. Tetraspanin CD81 is linked to ERK/MAPKinase signaling by Shc in liver tumor cells. Oncogene 23, 1566–1574 (2004). https://doi.org/10.1038/sj.onc.1207287

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