| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1928257 | Biochemical and Biophysical Research Communications | 2015 | 6 Pages |
•Wnt signaling as well as β-catenin overexpression enhance HuR cytoplasmic export.•HuR overexpression promotes cytoplasmic localization of β-catenin from the perinuclear fraction.•Wnt/β-catenin-mediated transcriptional activity is repressesed by HuR.
β-Catenin is the key transcriptional activator of canonical Wnt signaling in the nucleus; thus, nuclear accumulation of β-catenin is a critical step for expressing target genes. β-Catenin accumulates in the nucleus of cancer cells where it activates oncogenic target genes. Hu antigen R (HuR) is a RNA binding protein that regulates multiple post-transcriptional processes including RNA stability. Thus, cytoplasmic HuR protein may be involved in tumorigenesis by stabilizing oncogenic transcripts, but the molecular mechanism remains unclear. Here, we observed that Wnt/β-catenin signaling induced export of the HuR protein, whereas HuR overexpression promoted accumulation of the β-catenin protein in the cytoplasm. Thus, Wnt/β-catenin-mediated transcriptional activity in the nucleus was reduced by overexpressing HuR. These results suggest novel and uncharacterized cytoplasmic β-catenin functions related to HuR-mediated RNA metabolism in cancer cells.
