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Ear J, Dunkel Y, Mittal Y, Lim BBC, Liu L, Holda MK, Nitsche U, Barbazán J, Goel A, Janssen KP, Aznar N, Ghosh P. Two Isoforms of the Guanine Nucleotide Exchange Factor, Daple/CCDC88C Cooperate as Tumor Suppressors. Sci Rep 2019; 9:12124. [PMID: 31431650 PMCID: PMC6702192 DOI: 10.1038/s41598-019-48420-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 08/01/2019] [Indexed: 01/27/2023] Open
Abstract
Previously, Aznar et al., showed that Daple/CCDC88C enables Wnt receptors to transactivate trimeric G-proteins during non-canonical Wnt signaling via a novel G-protein binding and activating (GBA) motif. By doing so, Daple serves two opposing roles; earlier during oncogenesis it suppresses neoplastic transformation and tumor growth, but later it triggers epithelial-to-mesenchymal-transition (EMT). We have identified and characterized two isoforms of the human Daple gene. While both isoforms cooperatively suppress tumor growth via their GBA motif, only the full-length transcript triggers EMT and invasion. Both isoforms are suppressed during colon cancer progression, and their reduced expression carries additive prognostic significance. These findings provide insights into the opposing roles of Daple during cancer progression and define the G-protein regulatory GBA motif as one of the minimal modules essential for Daple’s role as a tumor suppressor.
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Affiliation(s)
- Jason Ear
- Department of Medicine, University of California, San Diego, La Jolla, California, USA.,Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, California, USA
| | - Ying Dunkel
- Department of Medicine, University of California, San Diego, La Jolla, California, USA
| | - Yash Mittal
- Department of Medicine, University of California, San Diego, La Jolla, California, USA
| | - Blaze B C Lim
- Department of Medicine, University of California, San Diego, La Jolla, California, USA
| | - Lawrence Liu
- Department of Medicine, University of California, San Diego, La Jolla, California, USA
| | - Magda K Holda
- Department of Medicine, University of California, San Diego, La Jolla, California, USA
| | - Ulrich Nitsche
- Department of Surgery, Klinikumrechts der Isar, TechnischeUniversitätMünchen, Munich, Germany
| | - Jorge Barbazán
- Translational Medical Oncology Laboratory, Health Research Institute of Santiago (IDIS), SERGAS., Santiago de Compostela, Spain
| | - Ajay Goel
- Division of Gastroenterology, Department of Internal Medicine and Charles A. Sammons Cancer Center and Baylor Research Institute, Baylor University Medical Center, Dallas, Texas, USA
| | - Klaus-Peter Janssen
- Department of Surgery, Klinikumrechts der Isar, TechnischeUniversitätMünchen, Munich, Germany
| | - Nicolas Aznar
- Department of Medicine, University of California, San Diego, La Jolla, California, USA. .,Cancer Research Center of Lyon, Centre Léon Bérard, Lyon, France.
| | - Pradipta Ghosh
- Department of Medicine, University of California, San Diego, La Jolla, California, USA. .,Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, California, USA. .,Moores Cancer Center, University of California, San Diego, La Jolla, California, USA.
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