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Ubiquitin-specific protease 1 (USP1) drives Ewing sarcoma growth and chemo-resistance by regulating EWS-FLI1 and cdc42. Inhibiting USP1 shows therapeutic potential for treating this pediatric cancer.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • Ewing sarcoma is a pediatric bone and soft tissue cancer driven by EWS-ETS fusions, notably EWS-FLI1.
  • Ewing sarcoma cells exist as two populations: CD133high (high growth) and CD133low (chemo-resistant).

Purpose of the Study:

  • To investigate the role of ubiquitin-specific protease 1 (USP1) in Ewing sarcoma growth and chemo-sensitivity.
  • To explore USP1's relationship with EWS-FLI1 and cdc42 in different Ewing sarcoma cell populations.

Main Methods:

  • Analysis of USP1 expression in CD133high and CD133low Ewing sarcoma cells.
  • Investigating USP1's effect on EWS-FLI1 transcriptional activity and cdc42.
  • Utilizing a pharmacological USP1 inhibitor to assess its impact on Ewing sarcoma growth and chemo-sensitivity.

Main Results:

  • USP1 is a transcriptional target of EWS-FLI1, with differential expression in CD133high and CD133low cells.
  • USP1 promotes Ewing sarcoma growth by increasing EWS-FLI1 output and inhibiting cdc42.
  • USP1-mediated chemo-sensitization is independent of cdc42.
  • USP1 inhibition activates cdc42 and reduces Ewing sarcoma growth.

Conclusions:

  • USP1 plays a dual role in Ewing sarcoma, regulating both tumor growth and chemo-sensitivity through distinct mechanisms.
  • Targeting USP1 offers a potential therapeutic strategy for Ewing sarcoma, impacting both tumor proliferation and treatment response.