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Choi D, Ramu S, Park E, Jung E, Yang S, Jung W, Choi I, Lee S, Kim KE, Seong YJ, Hong M, Daghlian G, Kim D, Shin E, Seo JI, Khatchadourian V, Zou M, Li W, De Filippo R, Kokorowski P, Chang A, Kim S, Bertoni A, Furlanetto TW, Shin S, Li M, Chen Y, Wong A, Koh C, Geliebter J, Hong YK. Aberrant Activation of Notch Signaling Inhibits PROX1 Activity to Enhance the Malignant Behavior of Thyroid Cancer Cells. Cancer Res 2015; 76:582-93. [PMID: 26609053 DOI: 10.1158/0008-5472.can-15-1199] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 11/01/2015] [Indexed: 12/30/2022]
Abstract
Papillary thyroid cancer (PTC) is one of the most common endocrine malignancies associated with significant morbidity and mortality. Although multiple studies have contributed to a better understanding of the genetic alterations underlying this frequently arising disease, the downstream molecular effectors that impact PTC pathogenesis remain to be further defined. Here, we report that the regulator of cell fate specification, PROX1, becomes inactivated in PTC through mRNA downregulation and cytoplasmic mislocalization. Expression studies in clinical specimens revealed that aberrantly activated NOTCH signaling promoted PROX1 downregulation and that cytoplasmic mislocalization significantly altered PROX1 protein stability. Importantly, restoration of PROX1 activity in thyroid carcinoma cells revealed that PROX1 not only enhanced Wnt/β-catenin signaling but also regulated several genes known to be associated with PTC, including thyroid cancer protein (TC)-1, SERPINA1, and FABP4. Furthermore, PROX1 reexpression suppressed the malignant phenotypes of thyroid carcinoma cells, such as proliferation, motility, adhesion, invasion, anchorage-independent growth, and polyploidy. Moreover, animal xenograft studies demonstrated that restoration of PROX1 severely impeded tumor formation and suppressed the invasiveness and the nuclear/cytoplasmic ratio of PTC cells. Taken together, our findings demonstrate that NOTCH-induced PROX1 inactivation significantly promotes the malignant behavior of thyroid carcinoma and suggest that PROX1 reactivation may represent a potential therapeutic strategy to attenuate disease progression.
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Affiliation(s)
- Dongwon Choi
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Swapnika Ramu
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Eunkyung Park
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Eunson Jung
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Sara Yang
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Wonhyeuk Jung
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Inho Choi
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California. Department of Pharmaceutical Engineering, College of Life and Health Sciences, Hoseo University, Asan, Chungnam, Republic of Korea
| | - Sunju Lee
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Kyu Eui Kim
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Young Jin Seong
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Mingu Hong
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - George Daghlian
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Daniel Kim
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Eugene Shin
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Jung In Seo
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Vicken Khatchadourian
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Mengchen Zou
- Department of Dermatology, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Wei Li
- Department of Dermatology, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Roger De Filippo
- Division of Urology, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Paul Kokorowski
- Division of Urology, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Andy Chang
- Division of Urology, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Steve Kim
- Division of Urology, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Ana Bertoni
- Department of Basic Health Sciences, Federal University of Health Sciences of Porto Alegre, Rio Grande do Sul, Brazil
| | - Tania Weber Furlanetto
- Postgraduate Program in Medicine: Medical Sciences, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Sung Shin
- Department of Pathology, Kaiser Permanente Medical Center, Fontana, California
| | - Meng Li
- Bioinformatics Service Program, Norris Medical Library, University of Southern California, Los Angeles, California
| | - Yibu Chen
- Bioinformatics Service Program, Norris Medical Library, University of Southern California, Los Angeles, California
| | - Alex Wong
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Chester Koh
- Division of Pediatric Urology, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas
| | - Jan Geliebter
- Department of Microbiology & Immunology, Department of Otolaryngology, New York Medical College, Valhalla, New York
| | - Young-Kwon Hong
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California.
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