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Deconstruction of the SS18-SSX Fusion Oncoprotein Complex: Insights into Disease Etiology and Therapeutics

机译:SS18-SSX融合癌蛋白复合物的解构:疾病病因学和治疗学的见解

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Synovial sarcoma is a translocation-associated sarcoma where the underlying chromosomal event generates SS18-SSX fusion transcripts. In vitro and in vivo studies have shown that the SS18-SSX fusion oncoprotein is both necessary and sufficient to support tumorigenesis; however, its mechanism of action remains poorly defined. We have purified a core SS18-SSX complex and discovered that SS18-SSX serves as a bridge between activating transcription factor 2 (ATF2) and transducin-like enhancer of split 1 (TLE1), resulting in repression of ATF2 target genes. Disruption of these components by siRNA knockdown or treatment with HDAC inhibitors rescues target gene expression, leading to growth suppression and apoptosis. Together, these studies define a fundamental role for aberrant ATF2 transcriptional dysregulation in the etiology of synovial sarcoma.
机译:滑膜肉瘤是易位相关的肉瘤,其中潜在的染色体事件产生SS18-SSX融合转录本。体外和体内研究表明,SS18-SSX融合癌蛋白既必要又足以支持肿瘤发生。但是,其作用机理仍然不清楚。我们已经纯化了核心的SS18-SSX复合物,并发现SS18-SSX充当激活转录因子2(ATF2)和分裂1(TLE1)的转导蛋白样增强子之间的桥梁,从而抑制了ATF2目标基因。通过siRNA敲除或用HDAC抑制剂处理破坏这些成分可拯救靶基因表达,从而导致生长抑制和细胞凋亡。总之,这些研究定义了滑膜肉瘤病因中异常ATF2转录异常的基本作用。

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