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  • Original Paper
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Divergent Ewing's sarcoma EWS/ETS fusions confer a common tumorigenic phenotype on NIH3T3 cells

Abstract

Ewing's sarcomas express chimeric transcription factors resulting from a fusion of the amino terminus of the EWS gene to the carboxyl terminus of one of five ETS proteins. While the majority of tumors express EWS/FLI1 fusions, some Ewing's tumors contain variant chimeras such as EWS/ETV1 that have divergent ETS DNA-binding domains. In spite of their structural differences, both EWS/ETS fusions up regulate EAT-2, a previously described EWS/FLI1 target gene. In contrast to EWS/FLI1, NIH3T3 cells expressing EWS/ETV1 cannot form colonies in soft agar though coexpression of a dominant negative truncated ETV1 construct attenuates EWS/FLI1 mediated anchorage independent growth. When EWS/ETV1 or EWS/FLI1 expressing NIH3T3 cells are injected into SCID mice, tumors form more often and faster than with NIH-3T3 cells with empty vector controls. The tumorigenic potency of each EWS/ETS fusion is linked to its C-terminal structure, with the FLI1 C-terminus confering a greater tumorigenic potential than the corresponding ETV1 domain. The resulting EWS/ETV1 and EWS/FLI1 tumors closely resemble each other at both a macroscopic and a microscopic level. These tumors differ greatly from tumors formed by NIH3T3 cells expressing activated RAS. These data indicate that in spite of their structural differences, EWS/ETV1 and EWS/FLI1 promote oncogenesis via similar biologic pathways.

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Acknowledgements

This work was funded by a grant from the American Cancer Society (DB-72) and the National Cancer Institute (CA32737). ADT is supported by NIH grant GM08042, MAT by the Lymphoma Research Foundation of America and AA by training grant CA09056. The authors wish to gratefully acknowledge the following individuals for assistance in building, sequencing, and testing constructs: Emily Chen, Akemi Yamaguchi, Steven Heber and Talin Hartunians. We would like to thank Elliot Landaw for performing statistical analysis of this data, Robin Simpkins for tissue processing and Harvey Herschman and Linda Baum for critical review of this manuscript.

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Thompson, A., Teitell, M., Arvand, A. et al. Divergent Ewing's sarcoma EWS/ETS fusions confer a common tumorigenic phenotype on NIH3T3 cells. Oncogene 18, 5506–5513 (1999). https://doi.org/10.1038/sj.onc.1202928

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