TRIM50 suppressed hepatocarcinoma progression through directly targeting SNAIL for ubiquitous degradation

Area of Science:

• Oncology
• Molecular Biology
• Biochemistry

Background:

• Tripartite motif-containing 50 (TRIM50) is part of the tripartite motif (TRIM) protein family, implicated in various cancers.
• The specific role of TRIM50 in hepatocellular carcinoma (HCC) pathogenesis requires further elucidation.

Purpose of the Study:

• To investigate the role of TRIM50 in hepatocellular carcinoma (HCC).
• To explore the molecular mechanisms underlying TRIM50's function in HCC, particularly its interaction with SNAIL and its effect on epithelial-to-mesenchymal transition (EMT).

Main Methods:

• Quantitative analysis of TRIM50 expression in HCC tissues versus non-cancerous tissues.
• Gain-of-function (overexpression) and loss-of-function (knockdown) assays in HCC cell lines to assess cellular behaviors (proliferation, colony formation, migration, invasion).
• Biochemical assays to determine TRIM50's direct binding with SNAIL and its effect on SNAIL ubiquitination and degradation.
• In vivo xenograft tumor models to evaluate the antitumor effect of TRIM50 in HCC.

Main Results:

• TRIM50 expression is significantly decreased in HCC tissues and correlates with advanced disease progression.
• Overexpression of TRIM50 inhibits HCC cell proliferation, colony formation, migration, and invasion, while knockdown enhances these malignant behaviors.
• TRIM50 directly binds to SNAIL, inducing its K-48 linked poly-ubiquitous degradation, thereby reversing SNAIL-mediated EMT.
• In vivo studies confirm the tumor-suppressive role of TRIM50 in HCC.

Conclusions:

• TRIM50 functions as a tumor suppressor in HCC by targeting SNAIL for degradation and inhibiting EMT.
• TRIM50's tumor-suppressive activity suggests its potential as a novel therapeutic target for HCC, especially in cases with SNAIL overexpression.