Active Notch1 confers a transformed phenotype to primary human melanocytes

Pinnix, Chelsea, Lee, John, Liu, Zhao-Jun, McDaid, Ronan, Balint, Klara, Beverly, Levi, Brafford, Patricia, Xiao, Min, Himes, Benjamin, Zabierowski, Susan, & Pollock, Pamela (2009) Active Notch1 confers a transformed phenotype to primary human melanocytes. Cancer Research, 69(13), pp. 5312-5320.

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The importance of mitogen-activated protein kinase signaling in melanoma is underscored by the prevalence of activating mutations in N-Ras and B-Raf, yet clinical development of inhibitors of this pathway has been largely ineffective, suggesting that alternative oncogenes may also promote melanoma. Notch is an interesting candidate that has only been correlated with melanoma development and progression; a thorough assessment of tumor-initiating effects of activated Notch on human melanocytes would clarify the mounting correlative evidence and perhaps identify a novel target for an otherwise untreatable disease. Analysis of a substantial panel of cell lines and patient lesions showed that Notch activity is significantly higher in melanomas than their nontransformed counterparts. The use of a constitutively active, truncated Notch transgene construct (N(IC)) was exploited to determine if Notch activation is a "driving" event in melanocytic transformation or instead a "passenger" event associated with melanoma progression. N(IC)-infected melanocytes displayed increased proliferative capacity and biological features more reminiscent of melanoma, such as dysregulated cell adhesion and migration. Gene expression analyses supported these observations and aided in the identification of MCAM, an adhesion molecule associated with acquisition of the malignant phenotype, as a direct target of Notch transactivation. N(IC)-positive melanocytes grew at clonal density, proliferated in limiting media conditions, and also exhibited anchorage-independent growth, suggesting that Notch alone is a transforming oncogene in human melanocytes, a phenomenon not previously described for any melanoma oncogene. This new information yields valuable insight into the basic epidemiology of melanoma and launches a realm of possibilities for drug intervention in this deadly disease.

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ID Code: 44507
Item Type: Journal Article
Refereed: Yes
Keywords: Notch, melanoma, transformation, MCAM, therapy
DOI: 10.1158/0008-5472.CAN-08-3767
ISSN: 0008-5472
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > ONCOLOGY AND CARCINOGENESIS (111200)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2009 American Association for Cancer Research
Deposited On: 24 Aug 2011 22:12
Last Modified: 20 Jul 2012 12:00

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