FHL3 promotes pancreatic cancer invasion and metastasis through preventing the ubiquitination degradation of EMT associated transcription factors.

ABSTRACT: Pancreatic ductal adenocarcinoma (PDAC) is intractable due to its strong invasiveness and metastatic ability. Epithelial-mesenchymal transition (EMT) is the pivotal driver of tumor invasion and metastasis. The four-and-a-half LIM domain (FHL) family is involved in regulating transforming growth factor (TGF)-? and Ras signaling, which might control the EMT process. In this study, we found that higher expression of four-and-a-half LIM domains 3 (FHL3) predicted poor prognosis in PDAC. The decreasing of FHL3 changed the EMT phenotype by blocking the TGF?/Atk/GSK3?/ubiquitin pathways. Interestingly, the GSK3? inhibitor could abrogate the role of FHL3 in the regulation of snail1 and twist1 expression, which implied that GSK3? plays a pivotal role in the FHL3-mediated EMT process. Furthermore, we found that FHL3 can directly bind to GSK3?, which weakened the interaction between GSK3? and snail1/twist1. We also found that the LIM-3 domain of FHL3 was required for the binding of FHL3 to GSK3?. Collectively, our study implied that FHL3, as a binding partner of GSK3?, promoted tumor metastasis in PDAC through inhibiting the ubiquitin-degradation of snail1 and twist1.

SUBMITTER: Li P 

PROVIDER: S-EPMC6977653 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature