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[Cancer Research 59, 711-719, February 1, 1999]
© 1999 American Association for Cancer Research

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[Cancer Research 59, 711-719, February 1, 1999]
© 1999 American Association for Cancer Research


Tumor Biology

Activation of Neurotrophin-3 Receptor TrkC Induces Apoptosis in Medulloblastomas1

John Y. H. Kim, Mary E. Sutton, Diane J. Lu, Tracey A. Cho, Liliana C. Goumnerova, Lyuda Goritchenko, Jill R. Kaufman, K. K. Lam, Amy L. Billet, Nancy J. Tarbell, Julian Wu, Jeffrey C. Allen, Charles D. Stiles, Rosalind A. Segal and Scott L. Pomeroy2

Division of Neuroscience, Department of Neurology [J. Y. H. K., M. E. S., D. J. L., T. A. C., J. R. K., K. K. L., S. L. P.] and Department of Neurosurgery [L. C. G., L. G.], Children’s Hospital; Departments of Neurology [R. A. S.] and Surgery [J. W.], Division of Neurosurgery, The Brain Tumor Center, Beth Israel/Deaconess Medical Center; Departments of Pediatric Hematology-Oncology [J. Y. H. K., A. L. B.] and Microbiology and Molecular Genetics [C. D. S.], Dana-Farber Cancer Institute; and Division of Radiation Oncology, Massachusetts General Hospital [N. J. T.], Harvard Medical School, Boston, Massachusetts 02115; Department of Neurosurgery, New England Medical Center, Tufts School of Medicine, Boston, Massachusetts 02111 [J. W.]; and Division of Neuro-oncology, New York University Medical Center, New York, New York 10016 [J. C. A.]

Elevated expression of the neurotrophin-3 (NT-3) receptor TrkC by childhood medulloblastomas is associated with favorable clinical outcome. Here, we provide evidence that TrkC is more than simply a passive marker of prognosis. We demonstrate that: (a) medulloblastomas undergo apoptosis in vitro when grown in the presence of NT-3; (b) overexpression of TrkC inhibits the growth of intracerebral xenografts of a medulloblastoma cell line in nude mice; and (c) trkC expression by individual tumor cells is highly correlated with apoptosis within primary medulloblastoma biopsy specimens. TrkC-mediated NT-3 signaling promotes apoptosis by activating multiple parallel signaling pathways and by inducing immediate-early gene expression of both c-jun and c-fos. Considered collectively, these results support the conclusion that the biological actions of TrkC activation affect medulloblastoma outcome by inhibiting tumor growth through the promotion of apoptosis.




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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cancer Prevention Research
Cancer Prevention Journals Portal Cancer Reviews Online
Annual Meeting Education Book Meeting Abstracts Online
Copyright © 1999 by the American Association for Cancer Research.