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Molecular and Cellular Biology, June 2000, p. 3928-3941, Vol. 20, No. 11
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Neoplastic Transformation by Notch Requires Nuclear Localization

Shawn Jeffries and Anthony J. Capobianco*

Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267-0524

Received 28 December 1999/Returned for modification 28 February 2000/Accepted 8 March 2000

Notch proteins are plasma membrane-spanning receptors that mediate important cell fate decisions such as differentiation, proliferation, and apoptosis. The mechanism of Notch signaling remains poorly understood. However, it is clear that the Notch signaling pathway mediates its effects through intercellular contact between neighboring cells. The prevailing model for Notch signaling suggests that ligand, presented on a neighboring cell, triggers proteolytic processing of Notch. Following proteolysis, it is thought that the intracellular portion of Notch (Nic) translocates to the nucleus, where it is involved in regulating gene expression. There is considerable debate concerning where in the cell Notch functions and what proteins serve as effectors of the Notch signal. Several Notch genes have clearly been shown to be proto-oncogenes in mammalian cells. Activation of Notch proto-oncogenes has been associated with tumorigenesis in several human and other mammalian cancers. Transforming alleles of Notch direct the expression of truncated proteins that primarily consist of Nic and are not tethered to the plasma membrane. However, the mechanism by which Notch oncoproteins (generically termed here as Nic) induce neoplastic transformation is not known. Previously we demonstrated that N1ic and N2ic could transform E1A immortalized baby rat kidney cells (RKE) in vitro. We now report direct evidence that N1ic must accumulate in the nucleus to induce transformation of RKE cells. In addition, we define the minimal domain of N1ic required to induce transformation and present evidence that transformation of RKE cells by N1ic is likely to be through a CBF1-independent pathway.

* Corresponding author. Mailing address: Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0524. Phone: (513) 558-3664. Fax: (513) 558-8474. E-mail: tony.capobianco{at}uc.edu.

Molecular and Cellular Biology, June 2000, p. 3928-3941, Vol. 20, No. 11
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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