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Notch signaling is not essential in sonic hedgehog-activated medulloblastoma.

Hatton, B A and Villavicencio, E H and Pritchard, J and Leblanc, M and Hansen, S and Ulrich, M and Ditzler, S and Pullar, B and Stroud, M R and Olson, J M (2010) Notch signaling is not essential in sonic hedgehog-activated medulloblastoma. Oncogene. ISSN 1476-5594 (In Press)

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Abstract

Dysregulated signal transduction through the notch pathway has been noted in human and mouse medulloblastoma studies. Gamma secretase inhibitors (GSIs) impair notch signaling by preventing the cleavage of transmembrane notch proteins into their active intracellular domain fragments. Previous studies have shown that GSI treatment caused apoptosis and impaired medulloblastoma cell engraftment in xenograft systems. In this study, we used in vivo genetic and pharmacologic approaches to quantify the contribution of notch signaling to sonic hedgehog (shh)-activated mouse medulloblastoma models. In contrast to prior in vitro studies, pharmacologic inhibition of notch pathways did not reduce the efficiency of medulloblastoma xenotransplantation nor did systemic therapy impact tumor size, proliferation, or apoptosis in genetically engineered mouse medulloblastoma models. The incidence and pathology of medulloblastomas driven by the SmoA1 transgene was unchanged by the bi-allelic absence of Notch1, Notch2, or Hes5 genes. These data show that notch signaling is not essential for the initiation, engraftment, or maintenance of sonic hedgehog pathway-driven medulloblastomas.Oncogene advance online publication, 3 May 2010; doi:10.1038/onc.2010.142.

Item Type: Article
Additional Information: This article is available to subscribers only via the URL above.
DOI: 10.1038/onc.2010.142
PubMed ID: 20440271
NIHMSID: NIHMS202675
PMCID: PMC2896441
Grant Numbers: R01 CA112350-04, R01 CA114567-04, K12 CA076930-11 , T32 CA009351-31
Keywords or MeSH Headings: Animals Brain Neoplasms/metabolism* Brain Neoplasms/pathology Hedgehog Proteins/physiology* Humans Medulloblastoma/metabolism* Medulloblastoma/pathology Mice Receptors, Notch/genetics Receptors, Notch/metabolism* Signal Transduction*
Depositing User: Library Staff
Date Deposited: 06 May 2010 22:42
Last Modified: 14 Feb 2012 14:43
URI: http://authors.fhcrc.org/id/eprint/435

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