Abstract:
:Ubiquilin1 (UBQLN1) is a ubiquitin-like domain and a ubiquitin-associated domain containing protein that has been reported to be involved in shuttling proteins to the proteasome, especially during endoplasmic reticulum-associated protein degradation. Thus, UBQLN1 function has been shown to be critical for combating a number of neurological disorders caused by protein aggregation, such as amyotrophic lateral sclerosis, Alzheimer's disease and Huntington's disease. A role for UBQLN1 in regulating processes involved in tumorigenesis has not been demonstrated. Herein, we show that loss of UBQLN1 causes increased cell migration and invasion, actin cytoskeleton reorganization and induction of epithelial-to-mesenchymal transition (EMT). Loss of UBQLN1 results in a significant decrease in the expression of epithelial markers including E-cadherin and claudin1, whereas expression of mesenchymal markers including Vimentin, Snail and ZEB1 are significantly elevated. Interestingly, we found that ZEB1 is required for induction of mesenchymal-like properties following loss of UBQLN1 and ZEB1 is capable of repressing expression of UBQLN1, suggesting a physiological, reciprocal regulation of EMT by UBQLN1 and ZEB1. Further, we find evidence for a role for UBQLN2 in also regulating EMT and cell migration. These observations have potential clinical relevance because the UBQLN1 gene is lost and underexpressed in a large percentage of human cancer cell lines, and primary human lung cancer samples and recurrent mutations in all five UBQLN family members have been identified in human lung cancers. Taken together, our results suggest for the first time a role for UBQLN family members in cancer biology.
journal_name
Oncogenejournal_title
Oncogeneauthors
Shah PP,Lockwood WW,Saurabh K,Kurlawala Z,Shannon SP,Waigel S,Zacharias W,Beverly LJdoi
10.1038/onc.2014.97subject
Has Abstractpub_date
2015-03-26 00:00:00pages
1709-17issue
13eissn
0950-9232issn
1476-5594pii
onc201497journal_volume
34pub_type
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