G3BP1 inhibits Cul3SPOP to amplify AR signaling and promote prostate cancer.
Publisher DOI
PubMed ID
34795264
Abstract
SPOP, an E3 ubiquitin ligase, acts as a prostate-specific tumor suppressor with several key substrates mediating oncogenic function. However, the mechanisms underlying SPOP regulation are largely unknown. Here, we have identified G3BP1 as an interactor of SPOP and functions as a competitive inhibitor of Cul3SPOP, suggesting a distinctive mode of Cul3SPOP inactivation in prostate cancer (PCa). Transcriptomic analysis and functional studies reveal a G3BP1-SPOP ubiquitin signaling axis that promotes PCa progression through activating AR signaling. Moreover, AR directly upregulates G3BP1 transcription to further amplify G3BP1-SPOP signaling in a feed-forward manner. Our study supports a fundamental role of G3BP1 in disabling the tumor suppressive Cul3SPOP, thus defining a PCa cohort independent of SPOP mutation. Therefore, there are significantly more PCa that are defective for SPOP ubiquitin ligase than previously appreciated, and these G3BP1high PCa are more susceptible to AR-targeted therapy.
Date Issued
2021-11-18
Publication Type
Article
Subject(s)
Language(s)
en
Author(s)
Mukhopadhyay, Chandrani | |
Yang, Chenyi | |
Xu, Limei | |
Liu, Deli | |
Wang, Yu | |
Huang, Dennis | |
Deonarine, Lesa Dayal | |
Cyrta, Joanna | |
Davicioni, Elai | |
Sboner, Andrea | |
Robinson, Brian D | |
Chinnaiyan, Arul M | |
Barbieri, Christopher E | |
Zhou, Pengbo |
Journal
Nature Communications
Publisher
Springer Nature
ISSN
2041-1723
Access(Rights)
open.access