SCFFBW7 regulates cellular apoptosis by targeting MCL1 for ubiquitylation and destruction

Hiroyuki Inuzuka, Shavali Shaik, Ichiro Onoyama, Daming Gao, Alan Tseng, Richard S. Maser, Bo Zhai, Lixin Wan, Alejandro Gutierrez, Alan W. Lau, Yonghong Xiao, Amanda L. Christie, Jon Aster, Jeffrey Settleman, Steven P. Gygi, Andrew L. Kung, Thomas Look, Keiichi I. Nakayama, Ronald A. Depinho, Wenyi Wei

研究成果: Contribution to journalArticle査読

445 被引用数 (Scopus)

抄録

The effective use of targeted therapy is highly dependent on the identification of responder patient populations. Loss of FBW7, which encodes a tumour-suppressor protein, is frequently found in various types of human cancer, including breast cancer, colon cancer and T-cell acute lymphoblastic leukaemia (T-ALL). In line with these genomic data, engineered deletion of Fbw7 in mouse T cells results in T-ALL, validating FBW7 as a T-ALL tumour suppressor. Determining the precise molecular mechanisms by which FBW7 exerts antitumour activity is an area of intensive investigation. These mechanisms are thought to relate in part to FBW7-mediated destruction of key proteins relevant to cancer, including Jun, Myc, cyclin E and notch 1 (ref. 9), all of which have oncoprotein activity and are overexpressed in various human cancers, including leukaemia. In addition to accelerating cell growth, overexpression of Jun, Myc or notch 1 can also induce programmed cell death. Thus, considerable uncertainty surrounds how FBW7-deficient cells evade cell death in the setting of upregulated Jun, Myc and/or notch 1. Here we show that the E3 ubiquitin ligase SCFFBW7 (a SKP1-cullin-1-F-box complex that contains FBW7 as the F-box protein) governs cellular apoptosis by targeting MCL1, a pro-survival BCL2 family member, for ubiquitylation and destruction in a manner that depends on phosphorylation by glycogen synthase kinase 3. Human T-ALL cell lines showed a close relationship between FBW7 loss and MCL1 overexpression. Correspondingly, T-ALL cell lines with defective FBW7 are particularly sensitive to the multi-kinase inhibitor sorafenib but resistant to the BCL2 antagonist ABT-737. On the genetic level, FBW7 reconstitution or MCL1 depletion restores sensitivity to ABT-737, establishing MCL1 as a therapeutically relevant bypass survival mechanism that enables FBW7-deficient cells to evade apoptosis. Therefore, our work provides insight into the molecular mechanism of direct tumour suppression by FBW7 and has implications for the targeted treatment of patients with FBW7-deficient T-ALL.

本文言語英語
ページ(範囲)104-109
ページ数6
ジャーナルNature
471
7336
DOI
出版ステータス出版済み - 3 3 2011

All Science Journal Classification (ASJC) codes

  • 一般

フィンガープリント

「SCF<sup>FBW7</sup> regulates cellular apoptosis by targeting MCL1 for ubiquitylation and destruction」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル