The deubiquitinase USP28 maintains the expression of the transcription factor MYCN and is essential in neuroblastoma cells

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作者：Junjun Li, Jin Peng, Lingzhi Wu, Xiang Shen, Xinghua Zhen, Yimao Zhang, Huailu Ma, Yongfeng Xu, Qunli Xiong, Qing Zhu, Pumin Zhang
期刊：JOURNAL OF BIOLOGICAL CHEMISTRY
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Neuroblastoma (NB) is one of the most common extracranial solid tumors in children. MYCN gene amplification is highly associated with poor prognosis in high-risk NB patients. In non-MYCN-amplified high-risk NB patients, the expression of c-MYC (MYCC) and its target genes is highly elevated. USP28 as a deubiquitinase is known to regulate the stability of MYCC. We show here USP28 also regulates the stability of MYCN. Genetic depletion or pharmacologic inhibition of the deubiquitinase strongly destabilizes MYCN and stops the growth of NB cells that overexpress MYCN. In addition, MYCC could be similarly destabilized in non-MYCN NB cells by compromising USP28 function. Our results strongly suggest USP28 as a therapeutic target for NB with or without MYCN amplification/overexpression.