Cancer-Specifically Re-Spliced TSG101 mRNA Promotes Invasion and Metastasis of Nasopharyngeal Carcinoma.

ABSTRACT: TSG101 (Tumor susceptibility 101) gene and its aberrantly spliced isoform, termed TSG101?154-1054, are tightly linked to tumorigenesis in various cancers. The aberrant TSG101?154-1054 mRNA is generated from cancer-specific re-splicing of mature TSG101 mRNA. The TSG101?154-1054 protein protects the full-length TSG101 protein from ubiquitin-mediated degradation, implicating TSG101?154-1054 protein in the progression of cancer. Here, we confirmed that the presence of TSG101?154-1054 mRNA indeed caused an accumulation of the TSG101 protein in biopsies of human nasopharyngeal carcinoma (NPC), which was recapitulated by the overexpression of TSG101?154-1054 in the NPC cell line TW01. We demonstrate the potential function of the TSG101?154-1054 protein in the malignancy of human NPC with scratch-wound healing and transwell invasion assays. By increasing the stability of the TSG101 protein, TSG101?154-1054 specifically enhanced TSG101-mediated TW01 cell migration and invasion, suggesting the involvement in NPC metastasis in vivo. This finding sheds light on the functional significance of TSG101?154-1054 generation via re-splicing of TSG101 mRNA in NPC metastasis and hints at its potential importance as a therapeutic target.

SUBMITTER: Chua HH 

PROVIDER: S-EPMC6387056 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature