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Human Molecular Genetics, 2002, Vol. 11, No. 25 3179-3189
© 2002 Oxford University Press

Neurofibromatosis 2 (NF2) tumor suppressor schwannomin and its interacting protein HRS regulate STAT signaling

Daniel R. Scoles1,*, Vu D. Nguyen1, Yun Qin1, Chun-Xiao Sun2, Helen Morrison3, David H. Gutmann2 and Stefan-M. Pulst1,4

1Neurogenetics Laboratory, CSMC Burns and Allen Research Institute, Cedars-Sinai Medical Center, School of Medicine, University of California at Los Angeles, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA, 2Department of Neurology, Washington University of Medicine, St Louis, MO 63110, USA, 3Forschungszentrum Karlsruhe, Institut fur Genetik, Karlsruhe, Germany and 4Division of Neurology, Cedars-Sinai Medical Center, University of California at Los Angeles School of Medicine, Los Angeles, CA 90048, USA

Received August 10, 2002; Accepted October 4, 2002

Mutations in the neurofibromatosis 2 (NF2) gene with the resultant loss of expression of the NF2 tumor suppressor schwannomin are one of the most common causes of benign human brain tumors, including schwannomas and meningiomas. Previously we demonstrated that the hepatocyte growth factor-regulated tyrosine kinase substrate (HRS) strongly interacts with schwannomin. HRS is a powerful regulator of receptor tyrosine kinase trafficking to the degradation pathway and HRS also binds STAM. Both of these actions for HRS potentially inhibit STAT activation. Therefore, we hypothesized that schwannomin inhibits STAT activation through interaction with HRS. We now show that both schwannomin and HRS inhibit Stat3 activation and that schwannomin suppresses Stat3 activation mediated by IGF-I treatment in the human schwannoma cell line STS26T. We also find that schwannomin inhibits Stat3 and Stat5 phosphorylation in the rat schwannoma cell line RT4. Schwannomin with the pathogenic missense mutation Q538P fails to bind HRS and does not inhibit Stat5 phosphorylation. These data are consistent with the hypothesis that schwannomin requires HRS interaction to be fully functionally active and to inhibit STAT activation.

* To whom correspondence should be addressed. Tel: +1 3104237374; Fax: +1 3104230149; Email: scolesd{at}cshs.org


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