Epsins 1 and 2 promote NEMO linear ubiquitination via LUBAC to drive breast cancer development.

TitleEpsins 1 and 2 promote NEMO linear ubiquitination via LUBAC to drive breast cancer development.
Publication TypeJournal Article
Year of Publication2020
AuthorsSong, K, Cai, X, Dong, Y, Wu, H, Wei, Y, Shankavaram, U, Cui, K, Lee, Y, Zhu, B, Bhattacharjee, S, Wang, B, Zhang, K, Wen, A, Wong, S, Yu, L, Xia, L, Welm, AL, Bielenberg, DR, Camphausen, K, Kang, Y, Chen, H
JournalJ Clin Invest
Date Published2020 Sep 22

<p>Estrogen receptor (ER)-negative breast cancer is thought to be more malignant and devastating than ER-positive breast cancer and exhibit elevated NF-κB activity. How abnormally high NF-κB activity is maintained in ER-negative breast cancer is poorly understood. The importance of linear ubiquitination, which is generated by the linear ubiquitin chain assembly complex (LUBAC), is increasingly appreciated in NF-κB signaling, which regulates cell activation and death. Here, we showed that epsin proteins, a family of ubiquitin-binding endocytic adaptors, interacted with LUBAC via its Ubiquitin-Interacting Motif (UIM) and bound LUBAC's bona fide substrate NEMO via its N-terminal homolog (ENTH) domain. Furthermore, epsins promoted NF-κB essential modulator (NEMO) linear ubiquitination and served as scaffolds for recruiting other components of the IκB kinase (IKK) complex; thereby, resulting in the heightened IKK activation and sustained NF-κB signaling essential for the development of ER-negative breast cancer. Heightened epsin levels in ER-negative human breast cancer are associated with poor, relapse-free survival. We showed that transgenic and pharmacological approaches eliminating epsins potently impeded breast cancer development in both spontaneous and patient-derived xenograft breast cancer mouse models. Our findings established the pivotal role epsins played in promoting breast cancer. Thus, targeting epsins may represent a strategy to restrain NF-κB signaling, and provide an important perspective into ER-negative breast cancer treatment.</p>

Alternate JournalJ Clin Invest
PubMed ID32960814