Abstract
Ectopic expression of the intracellular domain of NOTCH-4/INT-3 leads to tumorigenesis in the mouse mammary gland. This results from a gain-of-function mutation. To evaluate gain-of-function NOTCH-4/INT-3 activity in human cancers we have surveyed human breast, lung, and colon carcinoma tissue culture cell lines for evidence of increased NOTCH-4/INT-3 RNA expression. High levels of a 1.8 Kb NOTCH-4/INT-3 RNA species are detected in normal human testis but not in other tissues where a 6.5 Kb species is prevalent. Transformed human cancer cell lines express the 1.8 Kb NOTCH-4/INT-3 RNA species. We show that this RNA species encodes a truncated form of the NOTCH-4/INT-3 intracellular domain (ICD). This novel NOTCH-4/INT-3 protein includes the CDC10 repeats and amino acid residues C-terminal to them, but is missing the CBF-1 binding region of the NOTCH-4/INT-3 ICD. This suggests that it has a different mode of action. Furthermore, we show that a transgene which expresses the 1.8 Kb NOTCH-4/INT-3 RNA species in the `normal' human mammary epithelial cell line MCF-10A enables these cells to grow in soft agar.
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We thank Sharon Bargo for her excellent technical assistance, Dr Daniel Gallahan for helpful discussions, and Dr Gilbert H Smith for critically reading the manuscript.
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Imatani, A., Callahan, R. Identification of a novel NOTCH-4/INT-3 RNA species encoding an activated gene product in certain human tumor cell lines. Oncogene 19, 223–231 (2000). https://doi.org/10.1038/sj.onc.1203295
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DOI: https://doi.org/10.1038/sj.onc.1203295
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