Abstract
We investigated the role of SHPS-1/SIRPα1 in IL-1β- and TNFα-dependent signaling that leads to the activation of Erk 1/2 and Akt. Treatment of Balb3T3 cells with IL-1β or TNFα activated tyrosine phosphorylation of SHPS-1, its association with SHP-2 and the phosphorylation of Erk 1/2 and Akt. PP1, a specific inhibitor for the Src family protein tyrosine kinases, strongly inhibited tyrosine phosphorylation of SHPS-1 and complex formation of SHPS-1 with SHP-2 by IL-1β. In addition, PP1 substantially inhibited the IL-2β- and TNFα-dependent activation of Erk 1/2 and Akt. Exogenous expression of either SHPS-1 mutants that lack SHP-2 binding function or a dominant negative mutant of SHP-2 markedly inhibited the activation of Erk 1/2 and Akt by IL-1β, whereas wild type SHPS-1 did not. Moreover, IL-1β-stimulation induced association of SHPS-1 with IL-1RAcP, a second subunit of IL-1 receptor, whereas expression of SHPS-1 mutant that lack SHP-2 binding function clearly blocked the association and tyrosine phosphorylation of endogenous SHPS-1. Taken together, our results strongly suggest that activation of Erk 1/2 and Akt by proinflammatory cytokines requires tyrosine phosphorylation of SHPS-1 and subsequent association of SHPS-1 with SHP-2.
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Acknowledgements
We thank members and staff of the Hamaguchi Laboratory for their technical assistance and helpful discussions. This work was supported by a Grant-in-Aid for Center of Excellence (COE) Research from the Ministry of Education, Science, Sports and Culture of Japan, and a grant under the Monbusho International Scientific Research Program.
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Ruhul Amin, A., Machida, K., Oshima, K. et al. A role for SHPS-1/SIRPα1 in IL-1β- and TNFα-dependent signaling. Oncogene 21, 8871–8878 (2002). https://doi.org/10.1038/sj.onc.1206018
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DOI: https://doi.org/10.1038/sj.onc.1206018
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