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  • PM-18 EGFR-STAT3 Activates B-Catenin Signaling to Drive Neurofibroma Initiation in Nf1, and Plays a Role in Tumor Maintenance

    Article thumbnail: PM-18 EGFR-STAT3 Activates B-Catenin Signaling to Drive Neurofibroma Initiation in Nf1, and Plays a Role in Tumor Maintenance
    Type:
    Article
    Description/Abstract:
    PM-18. EGFR-STAT3 ACTIVATES b-CATENIN SIGNALING TO DRIVE NEUROFIBROMA INITIATION IN NF1, AND PLAYS A ROLE IN TUMOR MAINTENANCE Nancy Ratner1, Vincent Keng2, Deanna M. Patmore1, Jed K. Kendall1, Edwin Jousma1, Kwangmin Choi1, Danhua Fan2, Eric B. Schwartz2, James R. Fuchs2, Yuanshu Zou2, Mi-Ok Kim1, Eva Dombi5, David E. Levy6, Jose A. Cancelas1, Anat Stemmer-Rachamimov4, Robert J. Spinner3, and David A. Largaespada2; 1 Cincinnati Children’s, Cincinnati, OH, USA; 2 University of Minnesota, Minneapolis, MN, USA; 3 Mayo Clinic, Rochester, MN, USA; 4 Massachusetts General Hospital, Boston, MA, USA; 5 National Cancer Institute Pediatric Branch, Bethesda, MD, USA; 6 New York University School of Medicine, New York, NY, USA To identify genes and signaling pathways that drive peripheral nerve tumor initiationand growth beyond the Ras-MAPK pathwaywe used unbiased insertional mutagenesis screening. We identified Stat3 as a potential driver of Neurofibromatosis type 1 neurofibroma. Targeted genetic deletion of Stat3 in Schwann cell precursors (SCPs) and Schwann cells (SCs) largely prevented neurofibroma formation, and self-renewal of tumor initiating cells. Genetic gain- and loss-of-function identified EGFR as the major upstream regulator of P-Stat3 in mouse and human neurofibroma SCP and in neurofibroma initiation; IL-6 reinforced EGFR/Jak/Stat signaling. Preclinical tests of a Jak2/ Stat3 inhibitor reduced established neurofibroma growth, supporting an additional role for Stat3 in benign nerve tumor maintenance. Unexpectedly, downstream of Stat3, we identified b-catenin, and b-catenin expression rescued phenotypic effects of Stat3 loss in SCPs. Phosphorylated STAT3 (Y705) and b-catenin were strongly correlated in NF1 human plexiform neurofibromas. The data support testing of JAK/STAT inhibition and Wnt/ b-catenin pathway inhibition in neurofibroma therapeutic trials. Supported by: NIH R01 NS28840 to N.R. and NIH P50 NS057531 to N.R. and D.L.), a DAMD New Investigator Award (W81XWH-11-1-0259) and an Ohio State University Comprehensive Cancer Center Pelotonia Idea Grant (to J.W.). The American Cancer Society (IRG-67-003-44) supported J.R.F.
    Creator/Author:
    Schwartz, E. B.; Ratner, N.; Largaespada, D. A.; Cancelas, Jose A., and Stemmer-Rachamimov, A. O.
    Submitter:
    Jose Cancelas
    Date Uploaded:
    02/08/2017
    Date Modified:
    04/10/2017
    Date Created:
    2014-11
    License:
    All rights reserved