The association between let-7, RAS and HIF-1a in Ewing Sarcoma tumor growth

Michal Hameiri-Grossman, Adi Porat-Klein, Isaac Yaniv, Shifra Ash, Ian J. Cohen, Yona Kodman, Ronit Haklai, Galit Elad-Sfadia, Yoel Kloog, Elena Chepurko, Meora Feinmesser, Josephine Issakov, Osnat Sher, Drorit Luria, Yehuda Kollender, Avraham Weizman, Smadar Avigad*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Ewing Sarcoma (ES) is the second most common primary malignant bone tumor in children and adolescents. microRNAs (miRNAs) are involved in cancer as tumor suppressors or oncogenes. We studied the involvement of miRNAs located on chromosomes 11q and 22q that participate in the most common translocation in ES. Of these, we focused on 3 that belong to the let-7 family. We studied the expression levels of let-7a, and let-7b and detected a significant correlation between low expression of let-7b and increased risk of relapse. let-7 is known to be a negative regulator of the RAS oncogene. Indeed, we detected an inverse association between the expression of let-7 and RAS protein levels and its downstream target p-ERK, following transfection of let-7 mimics and inhibitors. Furthermore, we identified let-7 as a negative regulator of HIF-1a and EWS-FLI-1. Moreover, we were able to show that HIF-1a directly binds to the EWS-FLI-1 promoter. Salirasib treatment in-vitro resulted in the reduction of cell viability, migration ability, and in the decrease of cells in S-phase. A significant reduction in tumor burden and in the expression levels of both HIF-1a and EWS-FLI-1 proteins were observed in mice after treatment. Our results support the hypothesis that let-7 is a tumor suppressor that negatively regulates RAS, also in ES, and that HIF-1a may contribute to the aggressive metastatic behavior of ES. Moreover, the reduction in the tumor burden in a mouse model of ES following Salirasib treatment, suggests therapeutic potential for this RAS inhibitor in ES.

Original languageEnglish
Pages (from-to)33834-33848
Number of pages15
Issue number32
StatePublished - 2015


  • Ewing sarcoma
  • HIF-1α
  • Let-7
  • RAS
  • microRNA


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