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Abstract
Fusion-positive rhabdomyosarcoma (FP-RMS), driven by PAX-FOXO1, represents the subtype of RMS with the poorest prognosis. However, the oncogenic mechanisms and therapeutic strategies of PAX-FOXO1 remain incompletely understood. Here, we discovered that N-Myc, in addition to being a classic downstream target of PAX-FOXO1, can also activate its expression and form a transcriptional complex with PAX-FOXO1, thereby markedly amplifying oncogenic signaling. The reciprocal transcriptional activation of PAX3-FOXO1 and N-Myc is critical for FP-RMS malignancy. We further identified YOD1 as a deubiquitinating enzyme (DUB) that stabilizes both PAX-FOXO1 and N-Myc. Knocking down YOD1 or inhibiting it by G5 could suppress FP-RMS growth both in vitro and in vivo, through promoting the degradation of both PAX-FOXO1 and N-Myc. Collectively, our results identify that YOD1 promotes RMS progression by regulating the PAX3-FOXO1-N-Myc positive feedback loop, and highlight YOD1 inhibition as a promising therapeutic strategy that concurrently reduces the levels of both oncogenic proteins.
Authors
Wenwen Ying, Jiayi Yu, Xiaomin Wang, Jiayi Liu, Boyu Deng, Xuejing Shao, Jinhu Wang, Ting Tao, Ji Cao, Qiaojun He, Bo Yang, Yifan Chen, Meidan Ying
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