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Ozaki T, Nakamura M, Ogata T, Sang M, Yoda H, Hiraoka K, Sang M, Shimozato O. Depletion of pro-oncogenic RUNX2 enhances gemcitabine (GEM) sensitivity of p53-mutated pancreatic cancer Panc-1 cells through the induction of pro-apoptotic TAp63. Oncotarget 2018; 7:71937-71950. [PMID: 27713122 PMCID: PMC5342134 DOI: 10.18632/oncotarget.12433] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Accepted: 09/25/2016] [Indexed: 12/13/2022] Open
Abstract
Recently, we have described that siRNA-mediated silencing of runt-related transcription factor 2 (RUNX2) improves anti-cancer drug gemcitabine (GEM) sensitivity of p53-deficient human pancreatic cancer AsPC-1 cells through the augmentation of p53 family TAp63-dependent cell death pathway. In this manuscript, we have extended our study to p53-mutated human pancreatic cancer Panc-1 cells. According to our present results, knockdown of mutant p53 alone had a marginal effect on GEM-mediated cell death of Panc-1 cells. We then sought to deplete RUNX2 using siRNA in Panc-1 cells and examined its effect on GEM sensitivity. Under our experimental conditions, RUNX2 knockdown caused a significant enhancement of GEM sensitivity of Panc-1 cells. Notably, GEM-mediated induction of TAp63 but not of TAp73 was further stimulated in RUNX2-depleted Panc-1 cells, indicating that, like AsPC-1 cells, TAp63 might play a pivotal role in the regulation of GEM sensitivity of Panc-1 cells. Consistent with this notion, forced expression of TAp63α in Panc-1 cells promoted cell cycle arrest and/or cell death, and massively increased luciferase activities driven by TAp63-target gene promoters such as p21WAF1 and NOXA. In addition, immunoprecipitation experiments indicated that RUNX2 forms a complex with TAp63 in Panc-1 cells. Taken together, our current observations strongly suggest that depletion of RUNX2 enhances the cytotoxic effect of GEM on p53-mutated Panc-1 cells through the stimulation of TAp63-dependent cell death pathway even in the presence of a large amount of pro-oncogenic mutant p53, and might provide an attractive strategy to treat pancreatic cancer patients with p53 mutations.
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Affiliation(s)
- Toshinori Ozaki
- Laboratory of DNA Damage Signaling, Chiba Cancer Center Research Institute, Chiba, Japan
| | - Mizuyo Nakamura
- Laboratory of DNA Damage Signaling, Chiba Cancer Center Research Institute, Chiba, Japan
| | - Takehiro Ogata
- Laboratory of DNA Damage Signaling, Chiba Cancer Center Research Institute, Chiba, Japan
| | - Meijie Sang
- Laboratory of DNA Damage Signaling, Chiba Cancer Center Research Institute, Chiba, Japan.,Department of Regenerative Medicine, Graduate School of Medicine and Pharmatheutical Science, University of Toyama, Toyama, Japan
| | - Hiroyuki Yoda
- Laboratory of Cancer Genetics, Chiba Cancer Center Research Institute, Chiba, Japan
| | - Kiriko Hiraoka
- Laboratory of Cancer Genetics, Chiba Cancer Center Research Institute, Chiba, Japan
| | - Meixiang Sang
- Laboratory of DNA Damage Signaling, Chiba Cancer Center Research Institute, Chiba, Japan.,Research Center, Fourth Hospital of Hebei Medical University, Shijiazhuang, China
| | - Osamu Shimozato
- Laboratory of DNA Damage Signaling, Chiba Cancer Center Research Institute, Chiba, Japan
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Ng KY, Chan LH, Chai S, Tong M, Guan XY, Lee NP, Yuan Y, Xie D, Lee TK, Dusetti NJ, Carrier A, Ma S. TP53INP1 Downregulation Activates a p73-Dependent DUSP10/ERK Signaling Pathway to Promote Metastasis of Hepatocellular Carcinoma. Cancer Res 2017; 77:4602-4612. [PMID: 28674078 DOI: 10.1158/0008-5472.can-16-3456] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 05/26/2017] [Accepted: 06/27/2017] [Indexed: 11/16/2022]
Abstract
Identifying critical factors involved in the metastatic progression of hepatocellular carcinoma (HCC) may offer important therapeutic opportunities. Here, we report that the proapoptotic stress response factor TP53INP1 is often selectively downregulated in advanced stage IV and metastatic human HCC tumors. Mechanistic investigations revealed that TP53INP1 downregulation in early-stage HCC cells promoted metastasis via DUSP10 phosphatase-mediated activation of the ERK pathway. The DUSP10 promoter included putative binding sites for p73 directly implicated in modulation by TP53INP1. Overall, our findings show how TP53INP1 plays a critical role in limiting the progression of early-stage HCC, with implications for developing new therapeutic strategies to attack metastatic HCC. Cancer Res; 77(17); 4602-12. ©2017 AACR.
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Affiliation(s)
- Kai-Yu Ng
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong
| | - Lok-Hei Chan
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong
| | - Stella Chai
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong
| | - Man Tong
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong
| | - Xin-Yuan Guan
- Department of Clinical Oncology, The University of Hong Kong, Hong Kong.,State Key Laboratory for Liver Research, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong
| | - Nikki P Lee
- Department of Surgery, The University of Hong Kong, Hong Kong
| | - Yunfei Yuan
- State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Dan Xie
- State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Terence K Lee
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong
| | - Nelson J Dusetti
- Aix Marseille University, CNRS, INSERM, Institut Paoli-Calmettes, CRCM, Marseille, France
| | - Alice Carrier
- Aix Marseille University, CNRS, INSERM, Institut Paoli-Calmettes, CRCM, Marseille, France
| | - Stephanie Ma
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong. .,State Key Laboratory for Liver Research, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong
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