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[Cancer Research 64, 7787-7793, November 1, 2004]
© 2004 American Association for Cancer Research


Regular Articles

Notch1 and Notch2 Have Opposite Effects on Embryonal Brain Tumor Growth

Xing Fan1, Irina Mikolaenko1, Ihab Elhassan1, XingZhi Ni1, Yunyue Wang2, Douglas Ball2,3, Daniel J. Brat4, Arie Perry5 and Charles G. Eberhart1

Departments of 1 Pathology, 2 Medicine, and 3 Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland; 4 Department of Pathology, Emory University, Atlanta, Georgia; and 5 Department of Pathology, Washington University School of Medicine, St. Louis, Missouri

The role of Notch signaling in tumorigenesis can vary; Notch1 acts as an oncogene in some neoplasms, and a tumor suppressor in others. Here, we show that different Notch receptors can have opposite effects in a single tumor type. Expression of truncated, constitutively active Notch1 or Notch2 in embryonal brain tumor cell lines caused antagonistic effects on tumor growth. Cell proliferation, soft agar colony formation, and xenograft growth were all promoted by Notch2 and inhibited by Notch1. We also found that Notch2 receptor transcripts are highly expressed in progenitor cell-derived brain tumors such as medulloblastomas, whereas Notch1 is scarce or undetectable. This parallels normal cerebellar development, during which Notch2 is predominantly expressed in proliferating progenitors and Notch1 in postmitotic differentiating cells. Given the oncogenic effects of Notch2, we analyzed its gene dosage in 40 embryonal brain tumors, detecting an increased copy number in 15% of cases. Notch2 gene amplification was confirmed by fluorescence in situ hybridization in one case with extremely high Notch2 mRNA levels. In addition, expression of the Notch pathway target gene Hes1 in medulloblastomas was associated with significantly shorter patient survival (P = 0.01). Finally, pharmacological inhibition of Notch signaling suppresses growth of medulloblastoma cells. Our data indicate that Notch1 and Notch2 can have opposite effects on the growth of a single tumor type, and show that Notch2 can be overexpressed after gene amplification in human tumors.




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