EWSR1 overexpression is a pro-oncogenic event in multiple myeloma.

EWSR1 overexpression is a pro-oncogenic event in multiple myeloma. Int J Hematol. 2020 Oct 23;: Authors: Nishiyama D, Chinen Y, Isa R, Fujibayashi Y, Kuwahara-Ota S, Yamaguchi J, Takimoto-Shimomura T, Matsumura-Kimoto Y, Tsukamoto T, Shimura Y, Kobayashi T, Horiike S, Taniwaki M, Handa H, Kuroda J Abstract Multiple myeloma (MM) is cytogenetically, genetically and molecularly heterogenous even among subclones in one patient, therefore, it is essential to identify both frequent and patient-specific drivers of molecular abnormality. Following previous molecular investigations, we in this study investigated the expression patterns and function of the Ewing sarcoma breakpoint region 1 (EWSR1) gene in MM. The EWSR1 transcriptional level in CD138-positive myeloma cells was higher in 36.4% of monoclonal gammopathy of undetermined significance, in 67.4% of MM patients compared with normal plasma cells, and significantly higher in ten human myeloma-derived cell lines (HMCLs) examined. EWSR1 gene knockdown caused growth inhibition with an increase of apoptotic cells in NCI-H929 and KMS-12-BM cells. Gene expression profiling using microarray analysis suggested EWSR1 gene knockdown caused transcriptional modulation of several genes associated with processes such as cell proliferation, cell motility, cell metabolism, and gene expression. Of particular, EWSR1 gene knockdown caused upregulation of let-7c and downregulation of its known targets K-RAS...
Source: International Journal of Hematology - Category: Hematology Authors: Tags: Int J Hematol Source Type: research