| First Author | Chen N | Year | 2013 |
| Journal | Cancer Discov | Volume | 3 |
| Issue | 10 | Pages | 1172-89 |
| PubMed ID | 23838884 | Mgi Jnum | J:204336 |
| Mgi Id | MGI:5532263 | Doi | 10.1158/2159-8290.CD-12-0499 |
| Citation | Chen N, et al. (2013) DEAR1 is a chromosome 1p35 tumor suppressor and master regulator of TGF-beta-driven epithelial-mesenchymal transition. Cancer Discov 3(10):1172-89 |
| abstractText | Deletion of chromosome 1p35 is a common event in epithelial malignancies. We report that DEAR1 (annotated as TRIM62) is a chromosome 1p35 tumor suppressor that undergoes mutation, copy number variation, and loss of expression in human tumors. Targeted disruption in the mouse recapitulates this human tumor spectrum, with both Dear1(-/-) and Dear1(+/-) mice developing primarily epithelial adenocarcinomas and lymphoma with evidence of metastasis in a subset of mice. DEAR1 loss of function in the presence of TGF-beta results in failure of acinar morphogenesis, upregulation of epithelial-mesenchymal transition (EMT) markers, anoikis resistance, migration, and invasion. Furthermore, DEAR1 blocks TGF-beta-SMAD3 signaling, resulting in decreased nuclear phosphorylated SMAD3 by binding to and promoting the ubiquitination of SMAD3, the major effector of TGF-beta-induced EMT. Moreover, DEAR1 loss increases levels of SMAD3 downstream effectors SNAIL1 and SNAIL2, with genetic alteration of DEAR1/SNAIL2 serving as prognostic markers of overall poor survival in a cohort of 889 cases of invasive breast cancer. SIGNIFICANCE: Cumulative results provide compelling evidence that DEAR1 is a critical tumor suppressor involved in multiple human cancers and provide a novel paradigm for regulation of TGF-beta-induced EMT through DEAR1's regulation of SMAD3 protein levels. DEAR1 loss of function has important therapeutic implications for targeted therapies aimed at the TGF-beta-SMAD3 pathway. |
