Abstract
Chromosomal translocation t(11;22)(q24:q12) is detected in approximately 90% of tumours of the Ewing family (ET). This translocation results in EWS-Fli1 gene fusion which produces a EWS-Fli1 fusion protein acting as an aberrant transcriptional activator. We previously reported that the inhibition of EWS-Fli1 expression caused the G0/G1arrest of ET cells. We, therefore, hypothesized that EWS-Fli1 may affect the expression of G1regulatory genes. Downregulation of EWS-Fli1 fusion proteins was observed 48 hours after the treatment with EWS-Fli1 antisense oligonucleotides. The expressions of G1cyclins, cyclin D1 and cyclin E, were markedly decreased in parallel with the reduction of EWS-Fli1 fusion protein. On the other hand, the expression of p21 and p27, which are important cyclin-dependent kinase inhibitors (CKIs) for G1–S transition, was dramatically increased after the treatment with EWS-Fli1 antisense oligonucleotides. RT-PCR analysis showed that alteration of the expressions of the cyclins and CKIs occurred at the mRNA level. Furthermore, transfection of EWS-Fli1 cDNA to NIH3T3 caused transformation of the cells and induction of the expression of cyclin D1 and E. Clinical samples of ET also showed a high level of expression of cyclin D1 mRNA, whereas mRNAs for p21 and p27 were not detected in the samples. These findings strongly suggest that the G1–S regulatory genes may be involved in downstream of EWS-Fli1 transcription factor, and that the unbalanced expression of G1–S regulatory factors caused by EWS-Fli1 may lead to the tumorigenesis of ET. © 2001 Cancer Research Campaign
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Matsumoto, Y., Tanaka, K., Nakatani, F. et al. Downregulation and forced expression of EWS-Fli1 fusion gene results in changes in the expression of G1regulatory genes. Br J Cancer 84, 768–775 (2001). https://doi.org/10.1054/bjoc.2000.1652
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DOI: https://doi.org/10.1054/bjoc.2000.1652
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