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GSTM4 is a microsatellite-containing EWS/FLI target involved in Ewing's sarcoma oncogenesis and therapeutic resistance

Oncogene volume 28, pages 4126–4132 (2009)Cite this article

Abstract

Ewing's sarcoma is a malignant bone-associated tumor of children and young adults. Most cases of Ewing's sarcoma express the EWS/FLI fusion protein. EWS/FLI functions as an aberrant ETS-type transcription factor and serves as the master regulator of Ewing's sarcoma-transformed phenotype. We recently showed that EWS/FLI regulates one of its key targets, NR0B1, through a GGAA-microsatellite in its promoter. Whether other critical EWS/FLI targets are also regulated by GGAA-microsatellites was unknown. In this study, we combined transcriptional analysis, whole genome localization data, and RNA interference knockdown to identify glutathione S-transferase M4 (GSTM4) as a critical EWS/FLI target gene in Ewing's sarcoma. We found that EWS/FLI directly binds the GSTM4 promoter, and regulates GSTM4 expression through a GGAA-microsatellite in its promoter. Reduction of GSTM4 levels caused a loss of oncogenic transformation. Furthermore, reduction of GSTM4 resulted in an increased sensitivity of Ewing's sarcoma cells to chemotherapeutic agents, suggesting a role for this protein in drug resistance. Consistent with this hypothesis, patients with Ewing's sarcoma whose tumors had higher levels of GSTM4 expression had worse outcomes than those with lower expression levels. These data show that GSTM4 contributes to the cancerous behavior of Ewing's sarcoma and define a wider role for GGAA-microsatellites in EWS/FLI function than previously appreciated. These data also suggest a novel therapeutic resistance mechanism, in which the central oncogenic abnormality directly regulates a resistance gene.

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Acknowledgements

We thank Andrea Bild and Matt Topham for critical reading of the manuscript; Nikko Ronquillo, Mohan Kaadige and Kym Zumbrennen for technical assistance; and Elizabeth Leibold and members of the Lessnick laboratory for helpful discussions. This work was supported by funds awarded to SLL from the Terri Anna Perine Sarcoma Fund, the Liddy Shriver Sarcoma Initiative, the Sunbeam Foundation and Huntsman Cancer Institute/Huntsman Cancer Foundation, and by a grant to WL from the Alex's Lemonade Stand Foundation. We also acknowledge the NIH support to the Huntsman Cancer Institute (P30 CA042014).

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Authors and Affiliations

  1. Department of Oncological Sciences, University of Utah School of Medicine, Salt Lake City, UT, USA

    W Luo, K Gangwal, S Sankar, K M Boucher & S L Lessnick

  2. The Center for Children's Cancer Research, Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA

    W Luo, K Gangwal, S Sankar & S L Lessnick

  3. Department of Pathology, University of Michigan, Ann Arbor, MI, USA

    D Thomas

  4. Division of Pediatric Hematology/Oncology, University of Utah School of Medicine, Salt Lake City, UT, USA

    S L Lessnick

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  1. W Luo
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  2. K Gangwal
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  3. S Sankar
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  6. S L Lessnick
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Correspondence to S L Lessnick.

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Luo, W., Gangwal, K., Sankar, S. et al. GSTM4 is a microsatellite-containing EWS/FLI target involved in Ewing's sarcoma oncogenesis and therapeutic resistance. Oncogene 28, 4126–4132 (2009). https://doi.org/10.1038/onc.2009.262

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