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Casalino L, Talotta F, Matino I, Verde P. FRA-1 as a Regulator of EMT and Metastasis in Breast Cancer. Int J Mol Sci 2023; 24:ijms24098307. [PMID: 37176013 PMCID: PMC10179602 DOI: 10.3390/ijms24098307] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 04/21/2023] [Accepted: 05/01/2023] [Indexed: 05/15/2023] Open
Abstract
Among FOS-related components of the dimeric AP-1 transcription factor, the oncoprotein FRA-1 (encoded by FOSL1) is a key regulator of invasion and metastasis. The well-established FRA-1 pro-invasive activity in breast cancer, in which FOSL1 is overexpressed in the TNBC (Triple Negative Breast Cancer)/basal subtypes, correlates with the FRA-1-dependent transcriptional regulation of EMT (Epithelial-to-Mesenchymal Transition). After summarizing the major findings on FRA-1 in breast cancer invasiveness, we discuss the FRA-1 mechanistic links with EMT and cancer cell stemness, mediated by transcriptional and posttranscriptional interactions between FOSL1/FRA-1 and EMT-regulating transcription factors, miRNAs, RNA binding proteins and cytokines, along with other target genes involved in EMT. In addition to the FRA-1/AP-1 effects on the architecture of target promoters, we discuss the diagnostic and prognostic significance of the EMT-related FRA-1 transcriptome, along with therapeutic implications. Finally, we consider several novel perspectives regarding the less explored roles of FRA-1 in the tumor microenvironment and in control of the recently characterized hybrid EMT correlated with cancer cell plasticity, stemness, and metastatic potential. We will also examine the application of emerging technologies, such as single-cell analyses, along with animal models of TNBC and tumor-derived CTCs and PDXs (Circulating Tumor Cells and Patient-Derived Xenografts) for studying the FRA-1-mediated mechanisms in in vivo systems of EMT and metastasis.
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Affiliation(s)
- Laura Casalino
- Institute of Genetics and Biophysics "A. Buzzati Traverso", Consiglio Nazionale delle Ricerche (CNR), Via Pietro Castellino, 111, 80131 Naples, Italy
| | - Francesco Talotta
- Institute of Genetics and Biophysics "A. Buzzati Traverso", Consiglio Nazionale delle Ricerche (CNR), Via Pietro Castellino, 111, 80131 Naples, Italy
| | - Ilenia Matino
- Institute of Genetics and Biophysics "A. Buzzati Traverso", Consiglio Nazionale delle Ricerche (CNR), Via Pietro Castellino, 111, 80131 Naples, Italy
| | - Pasquale Verde
- Institute of Genetics and Biophysics "A. Buzzati Traverso", Consiglio Nazionale delle Ricerche (CNR), Via Pietro Castellino, 111, 80131 Naples, Italy
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2
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Shu L, Chen A, Li L, Yao L, He Y, Xu J, Gu W, Li Q, Wang K, Zhang T, Liu G. NRG1 regulates Fra-1 transcription and metastasis of triple-negative breast cancer cells via the c-Myc ubiquitination as manipulated by ERK1/2-mediated Fbxw7 phosphorylation. Oncogene 2022; 41:907-919. [PMID: 34992218 DOI: 10.1038/s41388-021-02142-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 11/14/2021] [Accepted: 11/29/2021] [Indexed: 11/09/2022]
Abstract
Neuregulin 1 (NRG1), an EGF family member, is expressed in most breast cancers. It promotes breast cancer growth and metastasis in HER2 receptor expressing breast cancer. However, its role in triple-negative breast cancer (TNBC) has not been extensively investigated. In this study, we observed that NRG1 knockdown resulted in the suppression of TNBC cells (MDA-MB-231 cell and MDA-MB-468 cell) metastasis and downregulation of Fra-1 (FOS-like 1, AP-1 transcription factor subunit, which is an overexpressed transcription factor in TNBC and acts as a coordinator of metastasis). In addition, the transcriptional regulation of Fra-1 by NRG1 was mediated by ERK1/2-induced recruitment of c-Myc (MYC proto-oncogene, transcription factor) to the promoter of Fra-1. Furthermore, c-Myc was targeted by an E3 ligase Fbxw7 and its ubiquitination and degradation by Fbxw7 was regulated by NRG1 expression and ERK1/2-mediated Fbxw7 phosphorylation that results in the dissociation and nuclear import of c-Myc. Taken together, the results of our study demonstrated that NRG1 regulates the Fra-1 expression to coordinate the TNBC metastasis via the novel ERK1/2-Fbxw7-c-Myc pathway and targeting NRG1 expression could be a potential therapeutic strategy for TNBC.
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Affiliation(s)
- Le Shu
- Anhui Province Key Laboratory of Translational Cancer Research, Bengbu Medical College, Bengbu, 233030, Anhui Province, People's Republic of China.
| | - Ao Chen
- Institute of Biology and Medicine, College of Life Science and Health, Wuhan University of Science and Technology, Wuhan, 430070, Hubei Province, People's Republic of China
| | - Linrui Li
- College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, Hubei Province, People's Republic of China
| | - Lun Yao
- College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, Hubei Province, People's Republic of China
| | - Yiduo He
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei Province, People's Republic of China
| | - Jianbo Xu
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei Province, People's Republic of China
| | - Wei Gu
- Anhui Province Key Laboratory of Translational Cancer Research, Bengbu Medical College, Bengbu, 233030, Anhui Province, People's Republic of China
- Department of Biochemistry and Molecular Biology, School of Laboratory Medicine, Bengbu Medical College, Bengbu, 233030, Anhui Province, People's Republic of China
| | - Qiang Li
- Anhui Province Key Laboratory of Translational Cancer Research, Bengbu Medical College, Bengbu, 233030, Anhui Province, People's Republic of China
- Department of Cell Biology, School of Biological Sciences, Bengbu Medical College, Bengbu, 233030, Anhui Province, People's Republic of China
| | - Kun Wang
- College of Biomedical Engineering, Hubei University of Medicine, Shiyan, 442000, Hubei Province, People's Republic of China
| | - Tongcun Zhang
- Institute of Biology and Medicine, College of Life Science and Health, Wuhan University of Science and Technology, Wuhan, 430070, Hubei Province, People's Republic of China
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education and Tianjin, College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, People's Republic of China
| | - Guoquan Liu
- Anhui Province Key Laboratory of Translational Cancer Research, Bengbu Medical College, Bengbu, 233030, Anhui Province, People's Republic of China.
- Department of Biochemistry and Molecular Biology, School of Laboratory Medicine, Bengbu Medical College, Bengbu, 233030, Anhui Province, People's Republic of China.
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3
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Chen H, Padia R, Li T, Li Y, Li B, Jin L, Huang S. Signaling of MK2 sustains robust AP1 activity for triple negative breast cancer tumorigenesis through direct phosphorylation of JAB1. NPJ Breast Cancer 2021; 7:91. [PMID: 34244488 PMCID: PMC8270897 DOI: 10.1038/s41523-021-00300-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 06/24/2021] [Indexed: 02/06/2023] Open
Abstract
Triple negative breast cancer (TNBC) cells are generally more invasive than estrogen receptor-positive (ER + ) breast cancer cells. Consistent with the importance of activator protein 1 (AP1) transcription factors in invasion, AP1 activity is much higher in TNBC lines than ER + lines. In TNBC cells, robust AP1 activity is facilitated by both ERK and p38MAPK signaling pathways. While ERK signaling pathway regulates AP1 activity by controlling the abundance of AP1 transcription factors, p38MAPK signaling pathway does it by enhancing AP1 binding to AP1 sites without altering their abundance. Here, we show that p38MAPK regulation of AP1 activity involves both MAPKAPK2 (MK2) and JAB1, a known JUN-binding protein. MK2 not only interacts with JAB1 but also directly phosphorylates JAB1 at Ser177 in TNBC cells. Interestingly, Ser177 phosphorylation does not affect JAB1 and JUN interaction. Instead, interfering with p38MAPK signaling pathway or introducing an S to A point mutation at Ser177 of JAB1 reduces JUN recruitment to the AP1 sites in cyclin D1, urokinase plasminogen activator (uPA) and uPA receptor promoters. Moreover, knockdown of JAB1 diminishes >60% of AP1 transcriptional activity in TNBC cells. Taken together, these results indicate that MK2-mediated phosphorylation of JAB1 facilitates JUN recruitment to AP1 sites, thus augmenting AP1 activity. In line with the role of JAB1 in AP1 activity, silencing JAB1 leads to dramatic reduction in TNBC cell growth, in vitro invasion and in vivo tumor outgrowth. This study suggests that the p38MAPK-MK2 signaling pathway promotes TNBC tumorigenesis by sustaining robust AP1 activity.
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Affiliation(s)
- Haoming Chen
- grid.8547.e0000 0001 0125 2443The Ministry of Education Key Laboratory of Contemporary Anthropology, College of Life Science, Fudan University, Shanghai, China
| | - Ravi Padia
- grid.15276.370000 0004 1936 8091Department of Anatomy and Cell Biology, University of Florida College of Medicine, Gainesville, FL USA
| | - Tao Li
- grid.15276.370000 0004 1936 8091Department of Anatomy and Cell Biology, University of Florida College of Medicine, Gainesville, FL USA
| | - Yue Li
- grid.15276.370000 0004 1936 8091Department of Anatomy and Cell Biology, University of Florida College of Medicine, Gainesville, FL USA
| | - Bin Li
- grid.15276.370000 0004 1936 8091Department of Anatomy and Cell Biology, University of Florida College of Medicine, Gainesville, FL USA
| | - Lingtao Jin
- grid.15276.370000 0004 1936 8091Department of Anatomy and Cell Biology, University of Florida College of Medicine, Gainesville, FL USA
| | - Shuang Huang
- grid.15276.370000 0004 1936 8091Department of Anatomy and Cell Biology, University of Florida College of Medicine, Gainesville, FL USA
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4
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Aldughaim MS, Al-Anazi MR, Bohol MFF, Colak D, Alothaid H, Wakil SM, Hagos ST, Ali D, Alarifi S, Rout S, Alkahtani S, Al-Ahdal MN, Al-Qahtani AA. Gene Expression and Transcriptome Profiling of Changes in a Cancer Cell Line Post-Exposure to Cadmium Telluride Quantum Dots: Possible Implications in Oncogenesis. Dose Response 2021; 19:15593258211019880. [PMID: 34177396 PMCID: PMC8202281 DOI: 10.1177/15593258211019880] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 04/28/2021] [Accepted: 04/30/2021] [Indexed: 11/29/2022] Open
Abstract
Cadmium telluride quantum dots (CdTe-QDs) are acquiring great interest in terms of their applications in biomedical sciences. Despite earlier sporadic studies on possible oncogenic roles and anticancer properties of CdTe-QDs, there is limited information regarding the oncogenic potential of CdTe-QDs in cancer progression. Here, we investigated the oncogenic effects of CdTe-QDs on the gene expression profiles of Chang cancer cells. Chang cancer cells were treated with 2 different doses of CdTe-QDs (10 and 25 μg/ml) at different time intervals (6, 12, and 24 h). Functional annotations helped identify the gene expression profile in terms of its biological process, canonical pathways, and gene interaction networks activated. It was found that the gene expression profiles varied in a time and dose-dependent manner. Validation of transcriptional changes of several genes through quantitative PCR showed that several genes upregulated by CdTe-QD exposure were somewhat linked with oncogenesis. CdTe-QD-triggered functional pathways that appear to associate with gene expression, cell proliferation, migration, adhesion, cell-cycle progression, signal transduction, and metabolism. Overall, CdTe-QD exposure led to changes in the gene expression profiles of the Chang cancer cells, highlighting that this nanoparticle can further drive oncogenesis and cancer progression, a finding that indicates the merit of immediate in vivo investigation.
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Affiliation(s)
| | - Mashael R Al-Anazi
- Department of Infection and Immunity, Research Centre, King Faisal Specialist Hospital & Research Centre, Riyadh, Saudi Arabia
| | - Marie Fe F Bohol
- Department of Infection and Immunity, Research Centre, King Faisal Specialist Hospital & Research Centre, Riyadh, Saudi Arabia
| | - Dilek Colak
- Department of Biostatistics, Epidemiology and Scientific Computing, Research Centre, King Faisal Specialist Hospital & Research Centre, Riyadh, Saudi Arabia
| | - Hani Alothaid
- Department of Basic Medical Sciences, Faculty of Applied Medical Sciences, Al-Baha University, Al-Baha, Saudi Arabia
| | - Salma Majid Wakil
- Genotyping Core Facility, Research Centre, King Faisal Specialist Hospital & Research Centre, Riyadh, Saudi Arabia
| | - Samya T Hagos
- Genotyping Core Facility, Research Centre, King Faisal Specialist Hospital & Research Centre, Riyadh, Saudi Arabia
| | - Daoud Ali
- Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Saud Alarifi
- Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Sashmita Rout
- Advanced Centre for Treatment, Research, and Education in Cancer, Tata memorial Hospital, Mumbai, India
| | - Saad Alkahtani
- Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Mohammed N Al-Ahdal
- Department of Infection and Immunity, Research Centre, King Faisal Specialist Hospital & Research Centre, Riyadh, Saudi Arabia.,Department of Microbiology and Immunology, Alfaisal University, School of Medicine, Riyadh, Saudi Arabia
| | - Ahmed A Al-Qahtani
- Department of Infection and Immunity, Research Centre, King Faisal Specialist Hospital & Research Centre, Riyadh, Saudi Arabia.,Department of Microbiology and Immunology, Alfaisal University, School of Medicine, Riyadh, Saudi Arabia
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5
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Xu L, Hu H, Zheng LS, Wang MY, Mei Y, Peng LX, Qiang YY, Li CZ, Meng DF, Wang MD, Liu ZJ, Li XJ, Huang BJ, Qian CN. ETV4 is a theranostic target in clear cell renal cell carcinoma that promotes metastasis by activating the pro-metastatic gene FOSL1 in a PI3K-AKT dependent manner. Cancer Lett 2020; 482:74-89. [PMID: 32305558 DOI: 10.1016/j.canlet.2020.04.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 03/22/2020] [Accepted: 04/02/2020] [Indexed: 02/06/2023]
Abstract
Distant metastasis is the major cause of short survival in ccRCC patients. However, the development of effective therapies for metastatic ccRCC is limited. Herein, we reported that ETV4 was selected from among 150 relevant genes with in vivo evidence of promoting metastasis. In this study, we identified that ETV4 promoted ccRCC cell migration and metastasis in vitro and in vivo, and a positive correlation between ETV4 and FOSL1 expression was found in ccRCC tissues and cell lines. Further investigation suggested that ETV4 increase FOSL1 expression through direct binding with the FOSL1 promoter. Furthermore, ETV4/FOSL1 was proved as a novel upstream and downstream causal relationship in ccRCC in an AKT dependent manner. In addition, both ETV4 and FOSL1 serve as an independent, unfavorable ccRCC prognostic indicator, and the accumulation of the ETV4 and FOSL1 in ccRCC patients result in a worse survival outcome in ccRCC patients. Taken together, our results suggest that the ETV4/FOSL1 axis acts as a prognostic biomarker and ETV4 directly up-regulates FOSL1 by binding with its promoter in a PI3K-AKT dependent manner, leading to metastasis and disease progression of ccRCC.
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Affiliation(s)
- Liang Xu
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China; Institute of Gastroenterology, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510655, Guangdong, China
| | - Hao Hu
- Department of Traditional Chinese Medicine, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, Guangdong, China; Guangzhou University of Chinese Medicine, Guangzhou, 510006, Guangdong, China
| | - Li-Sheng Zheng
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China
| | - Meng-Yao Wang
- Department of Radiation Oncology, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou, 510095, Guangdong, China
| | - Yan Mei
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China
| | - Li-Xia Peng
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China
| | - Yuan-Yuan Qiang
- Ningxia Medical University, Ningxia Key Laboratory for Cerebrocranical Disease, Yinchuan, 750001, Ningxia, China
| | - Chang-Zhi Li
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China
| | - Dong-Fang Meng
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China
| | - Ming-Dian Wang
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China
| | - Zhi-Jie Liu
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China
| | - Xin-Jian Li
- CAS Key Laboratory of Infection and Immunity, CAS Centre for Excellence in Bio-macromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Bi-Jun Huang
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China
| | - Chao-Nan Qian
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China; Department of Nasopharyngeal Carcinoma, Sun Yat-Sen University Cancer Center, Guangzhou, 510060, Guangdong, China.
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6
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Dou Y, Huang D, Zeng X, Zhou Y, Jiang X, Yue C, He J, Xiao S. All-trans retinoic acid enhances the effect of Fra-1 to inhibit cell proliferation and metabolism in cervical cancer. Biotechnol Lett 2020; 42:1051-1060. [PMID: 32124141 DOI: 10.1007/s10529-020-02847-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 02/20/2020] [Indexed: 12/24/2022]
Abstract
OBJECTIVES This study on all-trans retinoic acid was designed to explore its effect on the ability of Fra-1 to cervical cancer cell development. The results show that all-trans retinoic acid enhances the effect of Fra-1 on inhibiting cervical cancer proliferation and the glucose consumption, its effect on the loss of mitochondrial membrane potential, on the decreasing of lactic acid as well as ATP, and also influences the expression of MDM2/P53/P21 and LDHA. RESULTS The results show that the expression of Fra-1 is higher in all-trans retinoic acid-treated cervical cancer. Flow cytometry and kit detection show that all-trans retinoic acid can enhance the ability of Fra-1 to lose the mitochondrial membrane potential, inhibit the glucose consumption and the production of lactic acid as well as ATP. CCK8 and colony formation assays indicate that all-trans retinoic acid enhances the ability of Fra-1 to inhibit cell proliferation. In addition, through Western blot analysis, it was determined that P53 and P21 were up-regulated, and MDM2 and LDHA were down-regulated. CONCLUSION The overall results of the study strongly suggest that all-trans retinoic acid enhances the effect of Fra-1 on inhibiting cervical cancer proliferation and metabolism in vitro, and also influences the expression of MDM2/P53/P21 and LDHA.
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Affiliation(s)
- Yingyu Dou
- Department of Gynecology and Obstetrics, The Third Xiangya Hospital, Central South University, Changsha, 410013, Hunan, China
| | - Dongqing Huang
- Department of Gynecology and Obstetrics, The Third Xiangya Hospital, Central South University, Changsha, 410013, Hunan, China.,Department of Gynecology and Obstetrics, The Second Hospital of Zhuzhou, Zhuzhou, 412000, Hunan, China
| | - Xiangyang Zeng
- Department of Gynecology and Obstetrics, The Third Xiangya Hospital, Central South University, Changsha, 410013, Hunan, China
| | - Yanhong Zhou
- The Cancer Research Institute, Central South University, Changsha, Hunan, China
| | - Xiaoyan Jiang
- Department of Gynecology and Obstetrics, The Third Xiangya Hospital, Central South University, Changsha, 410013, Hunan, China
| | - Chunxue Yue
- The Cancer Research Institute, Central South University, Changsha, Hunan, China
| | - Junyu He
- The Cancer Research Institute, Central South University, Changsha, Hunan, China
| | - Songshu Xiao
- Department of Gynecology and Obstetrics, The Third Xiangya Hospital, Central South University, Changsha, 410013, Hunan, China.
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7
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Cheon MG, Son YW, Lee JH, Jang HH, Chung YS. Mts1 Up-regulation is Associated With Aggressive Pathological Features in Thyroid Cancer. Cancer Genomics Proteomics 2019; 16:369-376. [PMID: 31467231 DOI: 10.21873/cgp.20142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 06/28/2019] [Accepted: 07/01/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND/AIM Thyroid cancer is the most common type of endocrine cancer and its incidence and mortality are increasing. However, few studies on the molecular factors related to its poor prognosis have been performed. The aim of our study was to identify a poor prognostic factor for thyroid cancer to reduce its overtreatment, recurrence, and mortality. MATERIALS AND METHODS The present study is a retrospective study of 55 patients who were diagnosed with papillary thyroid cancer and operated in Korea from September 2013 to November 2015. RESULTS Mts1 is a member of the S100 protein family and is involved in tumor progression and metastasis. Mts1 was highly expressed in patients with thyroid cancer and high Mts1 levels were related to poor prognoses such as lymph node metastasis. CONCLUSION Mts1 is associated with aggressive pathological features in thyroid cancer, and may be a poor prognostic factor for thyroid cancer.
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Affiliation(s)
- Min Gyeong Cheon
- Department of Biochemistry, College of Medicine, Gachon University, Incheon, Republic of Korea
| | - Ye Won Son
- Department of Biochemistry, College of Medicine, Gachon University, Incheon, Republic of Korea
| | - Joon-Hyop Lee
- Department of Surgery, Gil Medical Center, Gachon University College of Medicine, Incheon, Republic of Korea
| | - Ho Hee Jang
- Department of Biochemistry, College of Medicine, Gachon University, Incheon, Republic of Korea
| | - Yoo Seung Chung
- Department of Surgery, Gil Medical Center, Gachon University College of Medicine, Incheon, Republic of Korea
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8
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Racca AC, Prucca CG, Caputto BL. Fra-1 and c-Fos N-Terminal Deletion Mutants Impair Breast Tumor Cell Proliferation by Blocking Lipid Synthesis Activation. Front Oncol 2019; 9:544. [PMID: 31275861 PMCID: PMC6593343 DOI: 10.3389/fonc.2019.00544] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 06/04/2019] [Indexed: 12/11/2022] Open
Abstract
Tumor cells require high rates of lipid synthesis to support membrane biogenesis for their exacerbated growth. The only two proteins known that activate phospholipid synthesis are Fra-1 and c-Fos, two members of the AP-1 family of transcription factors. These proteins that are overexpressed in human breast malignant tumors increase the rate of phospholipid synthesis at the endoplasmic reticulum through a mechanism independent of their nuclear function. The aim of this study was to inhibit breast tumor cell proliferation by modulating c-Fos and Fra-1 and regulate membrane biogenesis by controlling lipid synthesis rates. The molecular mechanism by which Fra-1 and c-Fos activate phospholipid synthesis was examined. Both proteins physically associate with the rate limiting enzyme CDP-DAG synthase through their N-terminus domain and activate it through their basic domain; neither protein associates to or activates the enzyme phosphatidylinositol synthase as determined through in vitro enzymatic reactions and FRET experiments. The N-terminus domain of both proteins act as negative dominant peptides that physically associate with CDP-DAG synthase but do not activate it. Proliferation of MDA-MB231 and 4T1 cells was impaired in vitro after inducing them to proliferate in the presence of the negative dominant peptides derived from Fra-1 and c-Fos. When tumors generated in Balb/c mice with the breast tumor cell line 4T1 were treated with these negative dominant peptides, a significant reduction in tumor growth was observed. Consequently, these Fra-1 and c-Fos negative dominant peptides can be exploited as a new therapeutic strategy to impair breast tumor cell proliferation.
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Affiliation(s)
- Ana Cristina Racca
- Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC-CONICET), Universidad Nacional de Córdoba, Córdoba, Argentina
| | - César Germán Prucca
- Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC-CONICET), Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Beatriz Leonor Caputto
- Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC-CONICET), Universidad Nacional de Córdoba, Córdoba, Argentina
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9
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Serino LTR, Jucoski TS, Morais SBD, Fernandes CCC, Lima RSD, Urban CA, Cavalli LR, Cavalli IJ, Ribeiro EMDSF. Association of FOSL1 copy number alteration and triple negative breast tumors. Genet Mol Biol 2019; 42:26-31. [PMID: 30816904 PMCID: PMC6428133 DOI: 10.1590/1678-4685-gmb-2017-0267] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 06/13/2018] [Indexed: 12/18/2022] Open
Abstract
Copy number alterations (CNAs) are a frequent feature in human breast cancer, and
one of the hallmarks of genomic instability. The FOSL1,
GSTP1 and CCND1 genes are located at
11q13, a cytoband commonly affected by CNA in breast cancer, with relevant
function in progression and invasion. Our main goal was to analyze CNAs of these
genes and determine their association with breast cancer subtypes. Seventy-three
cases of invasive breast tumors [52 Luminal, 7 HER2+ and 14 triple negative
(TNBC) subtypes] were analyzed by TaqMan assays. CNAs were observed for all
genes, with gains more frequently observed. Gains of the FOSL1
gene were observed in 71% of the cases. This gene was the only one with a
statistically significant difference (p<0.001) among tumor
subtypes, with increased copy number in TNBC compared to luminal and HER2+. No
significant association of CNA and clinical and histopathological parameters
from the patients was observed. Additional studies in larger breast cancer
patient cohorts based on more refined molecular subtypes are necessary to
confirm the observed association of FOSL1 gain with aggressive
breast tumors phenotypes.
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Affiliation(s)
- Leandro Tamião Rodrigues Serino
- Departmentamento de Genética, Laboratory of Human Cytogenetics and Oncogenetics, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | - Tayana Schultz Jucoski
- Departmentamento de Genética, Laboratory of Human Cytogenetics and Oncogenetics, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | - Stephanie Bath de Morais
- Departmentamento de Genética, Laboratory of Human Cytogenetics and Oncogenetics, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | - Cíntia Callegari Coêlho Fernandes
- Departmentamento de Genética, Laboratory of Human Cytogenetics and Oncogenetics, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | | | | | | | - Iglenir João Cavalli
- Departmentamento de Genética, Laboratory of Human Cytogenetics and Oncogenetics, Universidade Federal do Paraná, Curitiba, PR, Brazil
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10
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Sun XL, Li D, Fang J, Casto B, Noyes I, Milo GE. Metastatic conversion of chemically transformed human cells. Gene Expr 2018; 8:327-39. [PMID: 10947081 PMCID: PMC6157377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
A linear model for human cell metastasis has been developed in vitro from chemically transformed normal human cells. The chemically transformed cells are nontumorigenic in nude mice, but can be converted to a tumorigenic phenotype by transfection with a nondirectional cDNA library or antisense cDNA to the ML-1 gene. The primary transfected cell line (TR1T) forms localized, progressively growing tumors in nude mice that do not invade into the surrounding tissue. This tumorigenic TR1T cell line could be advanced into a metastatic stage following an additional transfection (TR2M cell line) with the cDNA expression library or antisense cDNA to the ML-1 gene. Metastatic cells, selected from tumors that were attached to internal organs, exhibited an increase in invasiveness as measured in vitro using an invasion chamber. The metastatic cells also exhibited an increased expression of matrix metalloproteinase-1 (MMP-1), although MMP-1 was not part of the cDNA that was transfected into either the TR1T cells or the doubly transfected metastatic TR2M cells. These data suggest that the increase in MMP-1 expression was a secondary downstream event responding to an upstream genetic change that initiated the conversion of cells from a tumorigenic to a metastatic stage. In summary, human cell lines representing premalignant, malignant, and metastatic phenotypes have been established in culture that can be used to identify gene changes that occur as normal human cells progress to a metastatic stage during tumor development. One gene, ML-1, that is found in the expression library appears to be involved in malignant progression, because ML-1 antisense cDNA will convert chemically transformed cells to both tumorigenic and metastatic stages, and cells from both local and metastatic tumors have a reduced or complete loss of expression of the ML-1 gene.
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Affiliation(s)
- X L Sun
- Department of Medical Biochemistry and Comprehensive Cancer Center, The Ohio State University College of Medicine and Public Health, Columbus 43210, USA.
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11
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Li YL, Jin YF, Liu XX, Li HJ. A comprehensive analysis of Wnt/β-catenin signaling pathway-related genes and crosstalk pathways in the treatment of As 2O 3 in renal cancer. Ren Fail 2018; 40:331-339. [PMID: 29633893 PMCID: PMC6014489 DOI: 10.1080/0886022x.2018.1456461] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
We aimed to investigate the effect of As2O3 treatment on Wnt/β-catenin signaling pathway-related genes and pathways in renal cancer. Illumina-based RNA-seq of 786-O cells with or without As2O3 treatment was performed, and differentially expressed genes (DEGs) were identified using Cuffdiff software. TargetMine was utilized to perform Gene Ontology (GO) pathway and Disease Ontology enrichment analyses. Furthermore, TRANSFAC database and LPIA method were applied to select differentially expressed transcription factors (TFs) and pathways related to Wnt/β-catenin signaling pathway, respectively. Additionally, transcriptional regulatory and pathway crosstalk networks were constructed. In total, 1684 DEGs and 69 TFs were screened out. The 821 up-regulated DEGs were mainly enriched in 67 pathways, 70 GO terms, and 46 disease pathways, while only 1 pathway and 5 GO terms were enriched for 863 down-regulated DEGs. A total of 18 DEGs (4 up-regulated and 14 down-regulated genes) were involved in the Wnt/β-catenin signaling pathway. Among the 18 DEGs, 4 ones were TFs. Furthermore, 211 pathways were predicted to be linked to the Wnt/β-catenin signaling pathway. In conclusion, As2O3 may have a significant effect on the Wnt/β-catenin signaling pathway for renal cancer treatment. The potential key DEGs are expected to be used as therapeutic targets.
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Affiliation(s)
- Yan-Lei Li
- a Medical Examination Center , China-Japan Union Hospital of Jilin University , Changchun , China
| | - Yu-Fen Jin
- b Clinical Laboratory , The Second Hospital of Jilin University , Changchun , China
| | - Xiu-Xia Liu
- b Clinical Laboratory , The Second Hospital of Jilin University , Changchun , China
| | - Hong-Jun Li
- a Medical Examination Center , China-Japan Union Hospital of Jilin University , Changchun , China
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12
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HIV-1 Nef CAWLEAQ motif: a regulator of monocytes invasion through ENO1 modulation. Mol Cell Biochem 2018; 447:151-164. [DOI: 10.1007/s11010-018-3300-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Accepted: 01/24/2018] [Indexed: 10/18/2022]
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13
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Endo S, Fujita M, Yamada S, Imadome K, Nakayama F, Isozaki T, Yasuda T, Imai T, Matsubara H. Fra‑1 enhances the radioresistance of colon cancer cells to X‑ray or C‑ion radiation. Oncol Rep 2018; 39:1112-1118. [PMID: 29399696 PMCID: PMC5802033 DOI: 10.3892/or.2018.6223] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 01/12/2018] [Indexed: 12/14/2022] Open
Abstract
Fos-related antigen 1 (Fra-1) has roles in a variety of cell functions, including cell proliferation, differentiation, transformation, and invasiveness, and it is upregulated in various cancers. We investigated the role of Fra-1 in cellular radioresistance using cells of two human colorectal cancer cell lines, SW620 and SW480. We found that SW620 cells are more sensitive than SW480 cells at doses greater than 6 Gy for X-ray or 3 Gy for carbon-ion (C-ion) radiation. Fra-1 expression tended to be decreased by the radiation in a dose-dependent manner in both cell lines; of note, a greater reduction of Fra-1 expression was observed in SW620 cells, especially at 6 Gy of X-ray or 3 Gy of C-ion irradiation, than in SW480 cells, indicating a possible association between Fra-1 downregulation and cellular radiosensitivity. Knockdown of Fra-1 in SW480 cells significantly increased the radiosensitivity to X-ray or C-ion radiation. On the other hand, overexpression of Fra-1 in SW620 cells significantly enhanced the radioresistance to C-ion radiation, suggesting a role of Fra-1 in radioresistance. Furthermore, we found that downregulation of Fra-1 protein in irradiated SW620 cells was regulated via protein degradation through a proteasome-dependent pathway. Overall, our results indicate a role of Fra-1 in radioresistance to both X-ray and C-ion radiation for colorectal cancer cell lines.
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Affiliation(s)
- Satoshi Endo
- Department of Frontier Surgery, Chiba University Graduate School of Medicine, Chiba 260‑8670, Japan
| | - Mayumi Fujita
- Department of Basic Medical Sciences for Radiation Damage, National Institutes for Quantum and Radiological Science and Technology, Japan
| | - Shigeru Yamada
- Hospital of The National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Japan
| | - Kaori Imadome
- Department of Basic Medical Sciences for Radiation Damage, National Institutes for Quantum and Radiological Science and Technology, Japan
| | - Fumiaki Nakayama
- Department of Basic Medical Sciences for Radiation Damage, National Institutes for Quantum and Radiological Science and Technology, Japan
| | - Tetsuro Isozaki
- Department of Frontier Surgery, Chiba University Graduate School of Medicine, Chiba 260‑8670, Japan
| | - Takeshi Yasuda
- Department of Basic Medical Sciences for Radiation Damage, National Institutes for Quantum and Radiological Science and Technology, Japan
| | - Takashi Imai
- National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Japan
| | - Hisahiro Matsubara
- Department of Frontier Surgery, Chiba University Graduate School of Medicine, Chiba 260‑8670, Japan
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14
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The Emerging Role of Polo-Like Kinase 1 in Epithelial-Mesenchymal Transition and Tumor Metastasis. Cancers (Basel) 2017; 9:cancers9100131. [PMID: 28953239 PMCID: PMC5664070 DOI: 10.3390/cancers9100131] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 09/22/2017] [Accepted: 09/25/2017] [Indexed: 12/31/2022] Open
Abstract
Polo-like kinase 1 (PLK1) is a serine/threonine kinase that plays a key role in the regulation of the cell cycle. PLK1 is overexpressed in a variety of human tumors, and its expression level often correlates with increased cellular proliferation and poor prognosis in cancer patients. It has been suggested that PLK1 controls cancer development through multiple mechanisms that include canonical regulation of mitosis and cytokinesis, modulation of DNA replication, and cell survival. However, emerging evidence suggests novel and previously unanticipated roles for PLK1 during tumor development. In this review, we will summarize the recent advancements in our understanding of the oncogenic functions of PLK1, with a focus on its role in epithelial-mesenchymal transition and tumor invasion. We will further discuss the therapeutic potential of these functions.
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15
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Hu S, Dong X, Gao W, Stupack D, Liu Y, Xiang R, Li N. Alternative promotion and suppression of metastasis by JNK2 governed by its phosphorylation. Oncotarget 2017; 8:56569-56581. [PMID: 28915613 PMCID: PMC5593584 DOI: 10.18632/oncotarget.17507] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 03/30/2017] [Indexed: 12/17/2022] Open
Abstract
Fos-related antigen 1 (Fra1) has been proposed as a gatekeeper of the mesenchymal-epithelial transition to epithelial-mesenchymal transition. Here, we showed that de-phosphorylated JNK2 increased the expression of Fra1 by promoting the expression of c-Jun and Jun-B. Conversely, phosphorylated JNK2 suppressed its expression via enhancing the ubiquitination of c-Jun and Jun-B. These data provided insights into the regulatory mechanism of JNK2 on the expression of Fra1. Our study thus demonstrated that the conversion of JNK2 from its phosphorylation to de-phosphorylation status promoted the switch of breast cancer cells from mesenchymal-epithelial transition to epithelial-mesenchymal transition.
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Affiliation(s)
- Sike Hu
- School of Medicine, Nankai University, Tianjin 300071, China
| | - Xiaoli Dong
- School of Medicine, Nankai University, Tianjin 300071, China
| | - Wenjuan Gao
- School of Medicine, Nankai University, Tianjin 300071, China
| | - Dwayne Stupack
- Department of Reproductive Medicine, Division of Gynecologic Oncology, Moores Cancer Center, University of California San Diego, La Jolla, CA 92093-0987, United States
| | - Yanhua Liu
- School of Medicine, Nankai University, Tianjin 300071, China., Tianjin Key Laboratory of Tumour Microenvironment and Neurovascular Regulation, Tianjin 300071, China
| | - Rong Xiang
- School of Medicine, Nankai University, Tianjin 300071, China., Tianjin Key Laboratory of Tumour Microenvironment and Neurovascular Regulation, Tianjin 300071, China.,Collaborative Innovation Center for Biotherapy, Nankai University, Tianjin 300071, China
| | - Na Li
- School of Medicine, Nankai University, Tianjin 300071, China., Tianjin Key Laboratory of Tumour Microenvironment and Neurovascular Regulation, Tianjin 300071, China.,Collaborative Innovation Center for Biotherapy, Nankai University, Tianjin 300071, China
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16
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Pasovic L, Eidet JR, Olstad OK, Chen DF, Lyberg T, Utheim TP. Impact of Storage Temperature on the Expression of Cell Survival Genes in Cultured ARPE-19 Cells. Curr Eye Res 2016; 42:134-144. [PMID: 27259952 DOI: 10.3109/02713683.2016.1145236] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
PURPOSE The development of a suitable storage method for retinal pigment epithelium (RPE) is necessary in the establishment of future RPE replacement therapy, and storage temperature has proven to be pivotal for cell survival. ARPE-19, a widely used model for RPE, has been shown to yield the greatest number of viable cells when stored at 16°C compared to other storage temperatures. In this study, we analyze the gene expression profile of cultured ARPE-19 cells after seven days of storage at different temperatures in an effort to predict the gene-level consequences of storage of RPE transplants. MATERIALS AND METHODS ARPE-19 cells were cultured until confluence and then stored in minimum essential medium at 4°C, 16°C, and 37°C for seven days. The total RNA was isolated and the gene expression profile was determined using DNA microarrays. The Results were validated using qPCR. RESULTS Principal component and hierarchical clustering analyses show that the gene expression profiles of cell cultures stored at different temperatures cluster into separate groups. Cultures stored at 4°C cluster closest to the control cultures that were not stored and display the least change in gene expression after storage (157 differentially expressed genes). Cultures stored at 16°C and 37°C display a much larger change in differential gene expression (1787 and 1357 differentially expressed genes, respectively). At 16°C, the expression of several genes with proposed tumor suppressor functions was markedly increased. Changes in regulation of several known signaling pathways and of oxidative stress markers were discovered at both 16°C and 37°C, and activation of the angiogenesis marker vascular endothelial growth factor (VEGF) was discovered at 37°C. There was no evidence of the activation of inflammatory processes in stored cell cultures. CONCLUSION ARPE-19 cultures stored at 16°C show the greatest propensity to modulate their gene expression profile in a manner that supports cell survival during storage.
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Affiliation(s)
- Lara Pasovic
- a Department of Medical Biochemistry , Oslo University Hospital , Oslo , Norway.,b Faculty of Medicine, University of Oslo , Oslo , Norway
| | - Jon R Eidet
- c Department of Ophthalmology , Oslo University Hospital , Oslo , Norway
| | - Ole K Olstad
- a Department of Medical Biochemistry , Oslo University Hospital , Oslo , Norway
| | - Dong F Chen
- d Schepens Eye Research Institute, Massachusetts Eye and Ear, Department of Ophthalmology , Harvard Medical School , Boston , USA
| | - Torstein Lyberg
- a Department of Medical Biochemistry , Oslo University Hospital , Oslo , Norway
| | - Tor P Utheim
- a Department of Medical Biochemistry , Oslo University Hospital , Oslo , Norway.,e Department of Oral Biology, Faculty of Dentistry , University of Oslo , Oslo , Norway
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17
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Kamide D, Yamashita T, Araki K, Tomifuji M, Tanaka Y, Tanaka S, Shiozawa S, Shiotani A. Selective activator protein-1 inhibitor T-5224 prevents lymph node metastasis in an oral cancer model. Cancer Sci 2016; 107:666-73. [PMID: 26918517 PMCID: PMC4970834 DOI: 10.1111/cas.12914] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Revised: 02/03/2016] [Accepted: 02/06/2016] [Indexed: 12/11/2022] Open
Abstract
Activator protein-1 (AP-1) is a transcriptional factor that regulates the expression of various genes associated with tumor invasion and migration. The purpose of our study was to assess the therapeutic effects of a novel selective AP-1 inhibitor, T-5224, in preventing lymph node metastasis in head and neck squamous cell carcinoma (HNSCC) in an orthotopic mouse model. We assessed the effect of T-5224 on HNSCC cell invasion, migration, proliferation, and MMP activity by carrying out an in vitro study using an invasion assay, scratch assay, WST-8 assay, and gelatin zymography. We also observed morphological changes in HNSCC cells by time-lapse microscopy. Furthermore, cervical lymph node metastasis was assessed using an orthotopic tumor model of human oral squamous cell carcinoma cells (HSC-3-M3) injected in the tongue of a BALB/c nude mouse. T-5224 (150 mg/kg) or vehicle was given orally every day for 4 weeks. Animals were killed and assessed for lymph node metastasis by H&E staining of resected lymph nodes. T-5224 significantly inhibited the invasion, migration, and MMP activity of HNSCC cells in a dose-dependent manner; there was no significant influence on cell proliferation. The antimetastatic effect of T-5224 was also confirmed in our animal study. The rate of cervical lymph node metastasis in the model was 40.0% in the T-5224-treated group (n = 30) versus 74.1% in the vehicle-treated group (n = 27; P < 0.05). In conclusion, T-5224 inhibited the invasion and migration of HNSCC cells in vitro, and prevented lymph node metastasis in head and neck cancer in an animal model.
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Affiliation(s)
- Daisuke Kamide
- Department of Otorhinolaryngology-Head and Neck Surgery, National Defense Medical College, Tokorozawa, Japan
| | - Taku Yamashita
- Department of Otorhinolaryngology-Head and Neck Surgery, National Defense Medical College, Tokorozawa, Japan.,Department of Otorhinolaryngology-Head and Neck Surgery, Kitasato University School of Medicine, Sagamihara, Japan
| | - Koji Araki
- Department of Otorhinolaryngology-Head and Neck Surgery, National Defense Medical College, Tokorozawa, Japan
| | - Masayuki Tomifuji
- Department of Otorhinolaryngology-Head and Neck Surgery, National Defense Medical College, Tokorozawa, Japan
| | - Yuya Tanaka
- Department of Otorhinolaryngology-Head and Neck Surgery, National Defense Medical College, Tokorozawa, Japan
| | - Shingo Tanaka
- Department of Otorhinolaryngology-Head and Neck Surgery, National Defense Medical College, Tokorozawa, Japan
| | - Shunichi Shiozawa
- Department of Medicine, Kyushu University Beppu Hospital, Beppu, Japan
| | - Akihiro Shiotani
- Department of Otorhinolaryngology-Head and Neck Surgery, National Defense Medical College, Tokorozawa, Japan
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18
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Wu J, Ivanov AI, Fisher PB, Fu Z. Polo-like kinase 1 induces epithelial-to-mesenchymal transition and promotes epithelial cell motility by activating CRAF/ERK signaling. eLife 2016; 5:e10734. [PMID: 27003818 PMCID: PMC4811775 DOI: 10.7554/elife.10734] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2015] [Accepted: 03/03/2016] [Indexed: 12/22/2022] Open
Abstract
Polo-like kinase 1 (PLK1) is a key cell cycle regulator implicated in the development of various cancers, including prostate cancer. However, the functions of PLK1 beyond cell cycle regulation remain poorly characterized. Here, we report that PLK1 overexpression in prostate epithelial cells triggers oncogenic transformation. It also results in dramatic transcriptional reprogramming of the cells, leading to epithelial-to-mesenchymal transition (EMT) and stimulation of cell migration and invasion. Consistently, PLK1 downregulation in metastatic prostate cancer cells enhances epithelial characteristics and inhibits cell motility. The signaling mechanisms underlying the observed cellular effects of PLK1 involve direct PLK1-dependent phosphorylation of CRAF with subsequent stimulation of the MEK1/2-ERK1/2-Fra1-ZEB1/2 signaling pathway. Our findings highlight novel non-canonical functions of PLK1 as a key regulator of EMT and cell motility in normal prostate epithelium and prostate cancer. This study also uncovers a previously unanticipated role of PLK1 as a potent activator of MAPK signaling.
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Affiliation(s)
- Jianguo Wu
- Department of Human and Molecular Genetics, Virginia Commonwealth University School of Medicine, Richmond, United States
- VCU Institute of Molecular Medicine, Virginia Commonwealth University School of Medicine, Richmond, United States
- VCU Massey Cancer Center, Virginia Commonwealth University School of Medicine, Richmond, United States
| | - Andrei I Ivanov
- Department of Human and Molecular Genetics, Virginia Commonwealth University School of Medicine, Richmond, United States
- VCU Institute of Molecular Medicine, Virginia Commonwealth University School of Medicine, Richmond, United States
- VCU Massey Cancer Center, Virginia Commonwealth University School of Medicine, Richmond, United States
| | - Paul B Fisher
- Department of Human and Molecular Genetics, Virginia Commonwealth University School of Medicine, Richmond, United States
- VCU Institute of Molecular Medicine, Virginia Commonwealth University School of Medicine, Richmond, United States
- VCU Massey Cancer Center, Virginia Commonwealth University School of Medicine, Richmond, United States
| | - Zheng Fu
- Department of Human and Molecular Genetics, Virginia Commonwealth University School of Medicine, Richmond, United States
- VCU Institute of Molecular Medicine, Virginia Commonwealth University School of Medicine, Richmond, United States
- VCU Massey Cancer Center, Virginia Commonwealth University School of Medicine, Richmond, United States
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19
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Cheng F, Su L, Yao C, Liu L, Shen J, Liu C, Chen X, Luo Y, Jiang L, Shan J, Chen J, Zhu W, Shao J, Qian C. SIRT1 promotes epithelial-mesenchymal transition and metastasis in colorectal cancer by regulating Fra-1 expression. Cancer Lett 2016; 375:274-283. [PMID: 26975631 DOI: 10.1016/j.canlet.2016.03.010] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2015] [Revised: 02/05/2016] [Accepted: 03/07/2016] [Indexed: 02/02/2023]
Abstract
Understanding molecular mechanisms of colorectal cancer (CRC) metastasis is urgently required for targeted therapy and prognosis of metastatic CRC. In this study, we explored potential effects of silent mating type information regulation 2 homolog 1 (SIRT1) on CRC metastasis. Our data showed that ectopic expression of SIRT1 markedly increased the migration and invasion of CRC cells. In contrast, silencing SIRT1 repressed this behavior in aggressive CRC cells. Tumor xenograft experiments revealed that knockdown of SIRT1 impaired CRC metastasis in vivo. Silencing SIRT1 in CRC cells induced mesenchymal-epithelial transition (MET), which is the reverse process of epithelial-mesenchymal transition (EMT) and characterized by a gain of epithelial and loss of mesenchymal markers. We provided a mechanistic insight toward regulation of Fra-1 by SIRT1 and demonstrated a direct link between the SIRT1-Fra-1 axis and EMT. Moreover, SIRT1 expression correlated positively with Fra-1 expression, metastasis and overall survival in patients with CRC. Taken together, our data provide a novel mechanistic role of SIRT1 in CRC metastasis, suggesting that SIRT1 may serve as a potential therapeutic target for metastatic CRC.
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Affiliation(s)
- Feifei Cheng
- School of Life Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Li Su
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Chao Yao
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Limei Liu
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Junjie Shen
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Chungang Liu
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Xuejiao Chen
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Yongli Luo
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Lupin Jiang
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Juanjuan Shan
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Jun Chen
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Wei Zhu
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Jimin Shao
- Department of Pathology and Pathophysiology, Zhejiang Key Laboratory for Disease Proteomics, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Cheng Qian
- School of Life Science, Zhejiang Sci-Tech University, Hangzhou 310018, China; Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China.
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20
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Bid HK, Phelps DA, Xaio L, Guttridge DC, Lin J, London C, Baker LH, Mo X, Houghton PJ. The Bromodomain BET Inhibitor JQ1 Suppresses Tumor Angiogenesis in Models of Childhood Sarcoma. Mol Cancer Ther 2016; 15:1018-28. [PMID: 26908627 DOI: 10.1158/1535-7163.mct-15-0567] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Accepted: 02/04/2016] [Indexed: 02/04/2023]
Abstract
The bromodomain and extra-terminal domain inhibitor JQ1 has marked antitumor activity against several hematologic malignancies as well as solid tumor models. Here, we investigated its activity in vitro and in vivo against models of childhood rhabdomyosarcoma and Ewing sarcoma. In vitro, JQ1 (but not the inactive enantiomer JQ1R) inhibited cell proliferation and increased G1 fraction of cells, although there was no correlation between cell line sensitivity and suppression of c-MYC or MYCN. In vivo, xenografts showed significant inhibition of growth during the period of treatment, and rapid regrowth after treatment was stopped, activity typical of antiangiogenic agents. Furthermore, xenografts derived from cell lines intrinsically resistant or sensitive to JQ1 in vitro had similar sensitivity in vivo as xenografts. Further investigation showed that JQ1 reduced tumor vascularization. This was secondary to both drug-induced downregulation of tumor-derived growth factors and direct effects of JQ1 on vascular elements. JQ1 suppressed VEGF-stimulated vascularization of Matrigel plugs in mice, and in vitro suppressed differentiation, proliferation, and invasion of human umbilical cord vascular endothelial cells (HUVEC). In HUVECs, JQ1 partially suppressed c-MYC levels, but dramatically reduced AP-1 levels and activity through suppression of the AP-1-associated protein FOSL1. Our data suggest that the antitumor activity of JQ1 in these sarcoma models is largely a consequence of its antiangiogenic activity. Mol Cancer Ther; 15(5); 1018-28. ©2016 AACR.
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Affiliation(s)
- Hemant K Bid
- Center for Childhood Cancer and Blood Diseases, Nationwide Children's Hospital, Columbus, Ohio
| | - Doris A Phelps
- Center for Childhood Cancer and Blood Diseases, Nationwide Children's Hospital, Columbus, Ohio
| | - Linlin Xaio
- Center for Childhood Cancer and Blood Diseases, Nationwide Children's Hospital, Columbus, Ohio
| | - Denis C Guttridge
- Center for Regenerative Medicine, Ohio State University, Columbus, Ohio
| | - Jiayuh Lin
- Center for Childhood Cancer and Blood Diseases, Nationwide Children's Hospital, Columbus, Ohio
| | - Cheryl London
- College of Veterinary Medicine, Ohio State University, Columbus, Ohio
| | - Laurence H Baker
- Division of Hematology/Oncology, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan
| | - Xiaokui Mo
- Center for Biostatistics, Ohio State University, Columbus, Ohio
| | - Peter J Houghton
- Center for Childhood Cancer and Blood Diseases, Nationwide Children's Hospital, Columbus, Ohio. Greehey Children's Cancer Research Institute, San Antonio, Texas.
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21
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Matsuo K, Kuroda Y, Nango N, Shimoda K, Kubota Y, Ema M, Bakiri L, Wagner EF, Takeda Y, Yashiro W, Momose A. Osteogenic capillaries orchestrate growth plate-independent ossification of the malleus. Development 2015; 142:3912-20. [PMID: 26428006 PMCID: PMC4712877 DOI: 10.1242/dev.123885] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Accepted: 09/20/2015] [Indexed: 12/11/2022]
Abstract
Endochondral ossification is a developmental process by which cartilage is replaced by bone. Terminally differentiated hypertrophic chondrocytes are calcified, vascularized, and removed by chondroclasts before bone matrix is laid down by osteoblasts. In mammals, the malleus is one of three auditory ossicles that transmit vibrations of the tympanic membrane to the inner ear. The malleus is formed from a cartilaginous precursor without growth plate involvement, but little is known about how bones of this type undergo endochondral ossification. Here, we demonstrate that in the processus brevis of the malleus, clusters of osteoblasts surrounding the capillary loop produce bone matrix, causing the volume of the capillary lumen to decrease rapidly in post-weaning mice. Synchrotron X-ray tomographic microscopy revealed a concentric, cylindrical arrangement of osteocyte lacunae along capillaries, indicative of pericapillary bone formation. Moreover, we report that overexpression of Fosl1, which encodes a component of the AP-1 transcription factor complex, in osteoblasts significantly blocked malleal capillary narrowing. These data suggest that osteoblast/endothelial cell interactions control growth plate-free endochondral ossification through ‘osteogenic capillaries’ in a Fosl1-regulated manner. Summary: The endochondral ossification of the malleus, an ossicle of the mouse inner ear, occurs around capillaries and is mediated by the AP-1 transcription factor Fosl1.
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Affiliation(s)
- Koichi Matsuo
- Laboratory of Cell and Tissue Biology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan
| | - Yukiko Kuroda
- Laboratory of Cell and Tissue Biology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan
| | - Nobuhito Nango
- Ratoc System Engineering Co., Ltd., 1-24-8 Sekiguchi, Bunkyo, Tokyo 162-0041, Japan
| | - Kouji Shimoda
- Laboratory Animal Center, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan
| | - Yoshiaki Kubota
- Department of Vascular Biology, The Sakaguchi Laboratory, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan
| | - Masatsugu Ema
- Research Center for Animal Life Science, Shiga University of Medical Science, Seta, Tsukinowa-cho, Otsu, Shiga 520-2192, Japan
| | - Latifa Bakiri
- Genes, Development and Disease Group, National Cancer Research Centre (CNIO), Cancer Cell Biology Programme, Melchor Fernandez Almagro 3, Madrid 28029, Spain
| | - Erwin F Wagner
- Genes, Development and Disease Group, National Cancer Research Centre (CNIO), Cancer Cell Biology Programme, Melchor Fernandez Almagro 3, Madrid 28029, Spain
| | - Yoshihiro Takeda
- X-ray Research Laboratory, Rigaku Corporation, 3-9-12 Matsubara-cho, Akishima, Tokyo 196-8666, Japan
| | - Wataru Yashiro
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Katahira 2-1-1, Aoba, Sendai Miyagi 980-8577, Japan
| | - Atsushi Momose
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Katahira 2-1-1, Aoba, Sendai Miyagi 980-8577, Japan
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22
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Dhillon AS, Tulchinsky E. FRA-1 as a driver of tumour heterogeneity: a nexus between oncogenes and embryonic signalling pathways in cancer. Oncogene 2015; 34:4421-8. [PMID: 25381818 PMCID: PMC4351906 DOI: 10.1038/onc.2014.374] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2014] [Revised: 10/02/2014] [Accepted: 10/02/2014] [Indexed: 12/12/2022]
Abstract
Tumour heterogeneity is a major factor undermining the success of therapies targeting metastatic cancer. Two major theories are thought to explain the phenomenon of heterogeneity in cancer--clonal evolution and cell plasticity. In this review, we examine a growing body of work implicating the transcription factor FOS-related antigen 1 (FRA-1) as a central node in tumour cell plasticity networks, and discuss mechanisms regulating its activity in cancer cells. We also discuss evidence from the FRA-1 perspective supporting the notion that clonal selection and cell plasticity represent two sides of the same coin. We propose that FRA-1-overexpressing clones featuring high plasticity undergo positive selection during consecutive stages of multistep tumour progression. This model underscores a potential mechanism through which tumour cells retaining elevated levels of plasticity acquire a selective advantage over other clonal populations within a tumour.
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Affiliation(s)
- A S Dhillon
- Research Division, Peter MacCallum Cancer Center, St Andrews Place, East Melbourne, Melbourne, Victoria 3002, Australia
| | - E Tulchinsky
- Department of Cancer Studies and Molecular Medicine, University of Leicester, Leicester, UK
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23
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Liu H, Ren G, Wang T, Chen Y, Gong C, Bai Y, Wang B, Qi H, Shen J, Zhu L, Qian C, Lai M, Shao J. Aberrantly expressed Fra-1 by IL-6/STAT3 transactivation promotes colorectal cancer aggressiveness through epithelial-mesenchymal transition. Carcinogenesis 2015; 36:459-68. [PMID: 25750173 PMCID: PMC4392608 DOI: 10.1093/carcin/bgv017] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Accepted: 02/24/2015] [Indexed: 12/12/2022] Open
Abstract
The pro-inflammatory cytokine interleukin-6 (IL-6) in tumor microenvironment has been suggested to promote development and progression of colorectal cancer (CRC). However, the underlying molecular mechanisms remain elusive. In this study, we demonstrate that fos-related antigen-1 (Fra-1) plays a critical role in IL-6 induced CRC aggressiveness and epithelial-mesenchymal transition (EMT). In CRC cell lines, the expression of Fra-1 gene was found significantly upregulated during IL-6-driven EMT process. The Fra-1 induction occurred at transcriptional level in a manner dependent on signal transducer and activator of transcription 3 (STAT3), during which both phosphorylated and acetylated post-translational modifications were required for STAT3 activation to directly bind to the Fra-1 promoter. Importantly, RNA interference-based attenuation of either STAT3 or Fra-1 prevented IL-6-induced EMT, cell migration and invasion, whereas ectopic expression of Fra-1 markedly reversed the STAT3-knockdown effect and enhanced CRC cell aggressiveness by regulating the expression of EMT-promoting factors (ZEB1, Snail, Slug, MMP-2 and MMP-9). Furthermore, Fra-1 levels were positively correlated with the local invasion depth as well as lymph node and liver metastasis in a total of 229 CRC patients. Intense immunohistochemical staining of Fra-1 was observed at the tumor marginal area adjacent to inflammatory cells and in parallel with IL-6 secretion and STAT3 activation in CRC tissues. Together, this study proposes the existence of an aberrant IL-6/STAT3/Fra-1 signaling axis leading to CRC aggressiveness through EMT induction, which suggests novel therapeutic opportunities for the malignant disease.
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Affiliation(s)
- Hong Liu
- Department of Pathology and Pathophysiology, Zhejiang Key Laboratory for Disease Proteomics, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Guoping Ren
- Department of Pathology, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China
| | - Tingyang Wang
- Department of Pathology and Pathophysiology, Zhejiang Key Laboratory for Disease Proteomics, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Yuexia Chen
- Department of Pathology and Pathophysiology, Zhejiang Key Laboratory for Disease Proteomics, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Chaoju Gong
- Department of Pathology and Pathophysiology, Zhejiang Key Laboratory for Disease Proteomics, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Yanfeng Bai
- Department of Pathology, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China
| | - Bo Wang
- Department of Pathology, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China
| | - Hongyan Qi
- Department of Pathology and Pathophysiology, Zhejiang Key Laboratory for Disease Proteomics, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Jing Shen
- Department of Pathology and Pathophysiology, Zhejiang Key Laboratory for Disease Proteomics, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Lijun Zhu
- Department of Pathology and Pathophysiology, Zhejiang Key Laboratory for Disease Proteomics, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Cheng Qian
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Maode Lai
- Department of Pathology and Pathophysiology, Zhejiang Key Laboratory for Disease Proteomics, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Jimin Shao
- Department of Pathology and Pathophysiology, Zhejiang Key Laboratory for Disease Proteomics, Zhejiang University School of Medicine, Hangzhou 310058, China,
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24
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Oliveira-Ferrer L, Kürschner M, Labitzky V, Wicklein D, Müller V, Lüers G, Schumacher U, Milde-Langosch K, Schröder C. Prognostic impact of transcription factor Fra-1 in ER-positive breast cancer: contribution to a metastatic phenotype through modulation of tumor cell adhesive properties. J Cancer Res Clin Oncol 2015; 141:1715-26. [PMID: 25666264 DOI: 10.1007/s00432-015-1925-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 01/20/2015] [Indexed: 01/01/2023]
Abstract
PURPOSE The transcription factor Fos-related antigen-1 (Fra-1) has been described to affect the morphology, motility and invasive potential of breast cancer cells. Since tumor cell adhesion plays an essential role in the metastatic process, especially for extravasation from blood vessels, we investigated the influence of Fra-1 on breast cancer cell interactions with the endothelium. METHODS Using Fra-1-overexpressing MCF7 [weakly invasive, estrogen receptor (ER)-positive] and MDA MB231 (strongly invasive, ER-negative) cells, we performed dynamic cell flow adhesion assays on surfaces coated with E-selectin or with human pulmonary microvascular endothelial cells. RESULTS We found a significant increased adhesion of Fra-1-overexpressing MCF7 cells to E-selectin but also to activate endothelial cells, whereas the MDA MB231 cell line showed moderate enhanced cell rolling and tethering on both coated surfaces. These different adhesion behaviors corresponded to an up-regulation of various adhesion-related proteins such as CD44 and integrin α5 in Fra-1-overexpressing MCF7 cells measured by microarray analysis and flow cytometry in comparison with no deregulation of key adhesion molecules observed in Fra-1-overexpressing MDA MB231 cells. In line with these results and based on cDNA microarray data of breast cancer patients (n = 197), high Fra-1 expression significantly correlates with shorter overall survival and higher rate of lung metastasis in ER-positive breast cancer patients (n = 130), but has no impact on the prognosis of patients with ER-negative tumors. CONCLUSION Thus, in addition to its pro-invasive and pro-migratory effect, Fra-1 might influence the metastatic potential of breast cancer cells by changing the expression of adhesion molecules, resulting in increased adherence to endothelial cells under flow conditions.
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Affiliation(s)
- L Oliveira-Ferrer
- Department of Gynecology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, Bldg. N27, 20246, Hamburg, Germany,
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25
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Ye N, Ding Y, Wild C, Shen Q, Zhou J. Small molecule inhibitors targeting activator protein 1 (AP-1). J Med Chem 2014; 57:6930-48. [PMID: 24831826 PMCID: PMC4148154 DOI: 10.1021/jm5004733] [Citation(s) in RCA: 186] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
![]()
Activator
protein 1 (AP-1) is a pivotal transcription factor that
regulates a wide range of cellular processes including proliferation,
apoptosis, differentiation, survival, cell migration, and transformation.
Accumulating evidence supports that AP-1 plays an important role in
several severe disorders including cancer, fibrosis, and organ injury,
as well as inflammatory disorders such as asthma, psoriasis, and rheumatoid
arthritis. AP-1 has emerged as an actively pursued drug discovery
target over the past decade. Excitingly, a selective AP-1 inhibitor
T-5224 (51) has been investigated in phase II human clinical
trials. Nevertheless, no effective AP-1 inhibitors have yet been approved
for clinical use. Despite significant advances achieved in understanding
AP-1 biology and function, as well as the identification of small
molecules modulating AP-1 associated signaling pathways, medicinal
chemistry efforts remain an urgent need to yield selective and efficacious
AP-1 inhibitors as a viable therapeutic strategy for human diseases.
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Affiliation(s)
- Na Ye
- Chemical Biology Program, Department of Pharmacology and Toxicology, University of Texas Medical Branch , Galveston, Texas 77555, United States
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26
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Renaud SJ, Kubota K, Rumi MAK, Soares MJ. The FOS transcription factor family differentially controls trophoblast migration and invasion. J Biol Chem 2013; 289:5025-39. [PMID: 24379408 DOI: 10.1074/jbc.m113.523746] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Extravillous trophoblast invasion is a fundamental component of human placentation. Invading trophoblast cells promote blood flow to the conceptus by actively remodeling the uterine vasculature. The extent of trophoblast invasion is tightly regulated; aberrant invasion is linked with several obstetrical complications. However, the transcriptional networks responsible for controlling the extent of trophoblast invasion are not well defined. Previous studies have identified high levels of FOS (FOS, FOSB, FOS-like (FOSL) 1, and FOSL2) proteins in extravillous trophoblast cells. These proteins form part of the activating protein-1 (AP-1) transcription factor complex and are implicated in regulating gene networks controlling cellular invasion in diverse biological systems. Therefore, we hypothesized that FOS family proteins play a role in regulating trophoblast invasion. We assessed expression of FOS family proteins in trophoblast cell lines and human placentae at different gestational ages. FOS, FOSB, and FOSL1 proteins were robustly increased in trophoblast cells subject to wound-based migration assays as well as Matrigel-based invasion assays. FOS knockdown resulted in cessation of proliferation and an induction of migration and invasion concomitant with robust expression of matrix metalloproteinase (MMP) 1, MMP3, and MMP10. Conversely, FOSL1 knockdown abrogated trophoblast migration and invasion and inhibited the production of MMP1, MMP3, and MMP10. In human placenta, FOS was expressed in proximal anchoring villi in conjunction with phospho-ERK. FOSL1 was temporally expressed only in the distal-most extravillous trophoblast cells, which represent a migratory cell population. Therefore, FOS and FOSL1 exert opposing effects on trophoblast invasion.
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Affiliation(s)
- Stephen J Renaud
- From the Institute of Reproductive Health and Regenerative Medicine, Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, Kansas 66160
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27
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Oliveira-Ferrer L, Rößler K, Haustein V, Schröder C, Wicklein D, Maltseva D, Khaustova N, Samatov T, Tonevitsky A, Mahner S, Jänicke F, Schumacher U, Milde-Langosch K. c-FOS suppresses ovarian cancer progression by changing adhesion. Br J Cancer 2013; 110:753-63. [PMID: 24322891 PMCID: PMC3915133 DOI: 10.1038/bjc.2013.774] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 11/07/2013] [Accepted: 11/13/2013] [Indexed: 01/11/2023] Open
Abstract
Background: C-Fos was initially described as oncogene, but was associated with favourable prognosis in ovarian cancer (OvCa) patients. The molecular and functional aspects underlying this effect are still unknown. Methods: Using stable transfectants of SKOV3 and OVCAR8 cells, proliferation, migration, invasion and apoptotic potential of c-FOS-overexpressing clones and controls were compared. Adherence to components of the extracellular matrix was analysed in static assays, and adhesion to E-selectin, endothelial and mesothelial cells in dynamic flow assays. The effect of c-FOS in vivo was studied after intraperitoneal injection of SKOV3 clones into SCID mice, and changes in gene expression were determined by microarray analysis. Results: Tumour growth after injection into SCID mice was strongly delayed by c-FOS overexpression, with reduction of lung metastases and circulating tumour cells. In vitro, c-FOS had only weak influence on proliferation and migration, but was strongly pro-apoptotic. Adhesion to components of the extracellular matrix (collagen I, IV) and to E-selectin, endothelial and mesothelial cells was significantly reduced in c-FOS-overexpressing OvCa cells. This corresponds to deregulation of adhesion proteins and glycosylation enzymes in microarray analysis. Conclusion: In addition to its known pro-apoptotic effect, c-FOS might influence OvCa progression by changing the adhesion of OvCa cells to peritoneal surfaces.
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Affiliation(s)
- L Oliveira-Ferrer
- Department of Gynecology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, D-20246, Hamburg, Germany
| | - K Rößler
- Department of Gynecology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, D-20246, Hamburg, Germany
| | - V Haustein
- Department of Gynecology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, D-20246, Hamburg, Germany
| | - C Schröder
- Department of Anatomy and Experimental Morphology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, D-20246, Hamburg, Germany
| | - D Wicklein
- Department of Anatomy and Experimental Morphology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, D-20246, Hamburg, Germany
| | - D Maltseva
- SRC Bioclinicum, Ugreshskaya Street 2/85, Moscow 115088, Russia
| | - N Khaustova
- SRC Bioclinicum, Ugreshskaya Street 2/85, Moscow 115088, Russia
| | - T Samatov
- SRC Bioclinicum, Ugreshskaya Street 2/85, Moscow 115088, Russia
| | - A Tonevitsky
- Institute of General Pathology and Pathophysiology, Baltijskaya Street 8, Moscow 125315, Russia
| | - S Mahner
- Department of Gynecology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, D-20246, Hamburg, Germany
| | - F Jänicke
- Department of Gynecology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, D-20246, Hamburg, Germany
| | - U Schumacher
- Department of Anatomy and Experimental Morphology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, D-20246, Hamburg, Germany
| | - K Milde-Langosch
- Department of Gynecology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, D-20246, Hamburg, Germany
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28
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Henckels E, Prywes R. Fra-1 regulation of Matrix Metallopeptidase-1 (MMP-1) in metastatic variants of MDA-MB-231 breast cancer cells. F1000Res 2013; 2:229. [PMID: 25339983 PMCID: PMC4193399 DOI: 10.12688/f1000research.2-229.v1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/24/2013] [Indexed: 12/13/2022] Open
Abstract
Matrix Metallopeptidase 1 (MMP-1) expression has repeatedly been correlated to tumorigenesis and metastasis. Yet, MMP-1 regulation in a metastatic context remains largely unknown. Here we confirm differential MMP-1 expression in mammary carcinoma cells with varied metastatic potentials. We show that MMP-1 expression is regulated by an AP-1 element in its promoter in highly metastatic MDA-MB-231 mammary carcinoma cell derivatives. Fra-1, an AP-1 family transcription factor, differentially binds this element in highly metastatic cells compared to low metastatic cells and is required for MMP-1 expression. Overexpression of Fra-1 also caused increased MMP-1 expression. Fra-1 mRNA levels are unchanged in the cell variants, however its protein levels are higher in the metastatic cells. While there was no change in Fra-1 protein degradation rates, protein synthesis of Fra-1 was increased in the metastatic cell variant. These results demonstrate that Fra-1 and MMP-1 levels are differentially regulated in metastatic cell variants at the level of Fra-1 protein translation. Consistent with the importance of Fra-1 for tumor growth, we found that Fra-1 overexpression was sufficient to increase cell motility and anchorage independent growth. These results suggest that increased Fra-1 translation is critical for regulation of MMP-1 and tumor cell metastasis.
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Affiliation(s)
- Eric Henckels
- Department of Biological Sciences, Columbia University, New York, NY 10027, USA
| | - Ron Prywes
- Department of Biological Sciences, Columbia University, New York, NY 10027, USA
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29
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Nasarre P, Gemmill RM, Potiron VA, Roche J, Lu X, Barón AE, Korch C, Garrett-Mayer E, Lagana A, Howe PH, Drabkin HA. Neuropilin-2 Is upregulated in lung cancer cells during TGF-β1-induced epithelial-mesenchymal transition. Cancer Res 2013; 73:7111-21. [PMID: 24121493 DOI: 10.1158/0008-5472.can-13-1755] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The epithelial-mesenchymal transition (EMT) and its reversal, mesenchymal-epithelial transition (MET), are fundamental processes involved in tumor cell invasion and metastasis. SEMA3F is a secreted semaphorin and tumor suppressor downregulated by TGF-β1 and ZEB1-induced EMT. Here, we report that neuropilin (NRP)-2, the high-affinity receptor for SEMA3F and a coreceptor for certain growth factors, is upregulated during TGF-β1-driven EMT in lung cancer cells. Mechanistically, NRP2 upregulation was TβRI dependent and SMAD independent, occurring mainly at a posttranscriptional level involving increased association of mRNA with polyribosomes. Extracellular signal-regulated kinase (ERK) and AKT inhibition blocked NRP2 upregulation, whereas RNA interference-mediated attenuation of ZEB1 reduced steady-state NRP2 levels. In addition, NRP2 attenuation inhibited TGF-β1-driven morphologic transformation, migration/invasion, ERK activation, growth suppression, and changes in gene expression. In a mouse xenograft model of lung cancer, NRP2 attenuation also inhibited locally invasive features of the tumor and reversed TGF-β1-mediated growth inhibition. In support of these results, human lung cancer specimens with the highest NRP2 expression were predominantly E-cadherin negative. Furthermore, the presence of NRP2 staining strengthened the association of E-cadherin loss with high-grade tumors. Together, our results demonstrate that NRP2 contributes significantly to TGF-β1-induced EMT in lung cancer.
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Affiliation(s)
- Patrick Nasarre
- Authors' Affiliations: Division of Hematology-Oncology, Department of Public Health Sciences, Department of Biochemistry, The Hollings Cancer Center and Medical University of South Carolina, Charleston, South Carolina; Department of Biostatistics and informatics; Division of Medical Oncology, University of Colorado Denver, Anschutz Medical Campus, Aurora, Colorado; and Department of Molecular Virology, Immunology, and Medical Genetics, School of Medicine, The Ohio State University, Columbus, Ohio
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30
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Sung CH, Im HJ, Park N, Kwon Y, Shin S, Ye DJ, Cho NH, Park YS, Choi HK, Kim D, Chun YJ. Induction of steroid sulfatase expression in PC-3 human prostate cancer cells by insulin-like growth factor II. Toxicol Lett 2013; 223:109-15. [PMID: 24055520 DOI: 10.1016/j.toxlet.2013.09.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2012] [Revised: 09/03/2013] [Accepted: 09/10/2013] [Indexed: 11/17/2022]
Abstract
Human steroid sulfatase (STS) plays an important role in regulating the formation of biologically active estrogens and may be a promising target for treating estrogen-mediated carcinogenesis. The molecular mechanism of STS gene expression, however, is still not clear. Growth factors are known to increase STS activity but the changes in STS expression have not been completely understood. To determine whether insulin-like growth factor (IGF)-II can induce STS gene expression, the effects of IGF-II on STS expression were studied in PC-3 human prostate cancer cells. RT-PCR and Western blot analysis showed that IGF-II treatment significantly increased the expression of STS mRNA and protein in concentration- and time-dependent manners. To understand the signaling pathway by which IGF-II induces STS gene expression, the effects of specific PI3-kinase/Akt and NF-κB inhibitors were determined. When the cells were treated with IGF-II and PI3-kinase/Akt inhibitors, such as LY294002, wortmannin, or Akt inhibitor IV, STS expression induced by IGF-II was significantly blocked. Moreover, we found that NF-κB inhibitors, such as MG-132, bortezomib, Bay 11-7082 or Nemo binding domain (NBD) binding peptide, also strongly prevented IGF-II from inducing STS gene expression. We assessed whether IGF-II activates STS promoter activity using transient transfection with a luciferase reporter. IGF-II significantly stimulated STS reporter activity. Furthermore, IGF-II induced expression of 17β-hydroxysteroid dehydrogenase (HSD) 1 and 3, whereas it reduced estrone sulfotransferase (EST) gene expression, causing enhanced estrone and β-estradiol production. Taken together, these results strongly suggest that IGF-II induces STS expression via a PI3-kinase/Akt-NF-κB signaling pathway in PC-3 cells and may induce estrogen production and estrogen-mediated carcinogenesis.
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Affiliation(s)
- Chul-Hoon Sung
- College of Pharmacy, Chung-Ang University, Seoul 156-756, Republic of Korea
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31
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MicroRNA-19a-3p inhibits breast cancer progression and metastasis by inducing macrophage polarization through downregulated expression of Fra-1 proto-oncogene. Oncogene 2013; 33:3014-23. [PMID: 23831570 DOI: 10.1038/onc.2013.258] [Citation(s) in RCA: 141] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Revised: 03/22/2013] [Accepted: 04/29/2013] [Indexed: 12/11/2022]
Abstract
One of the hallmarks of malignancy is the polarization of tumor-associated macrophages (TAMs) from a pro-immune (M1-like) phenotype to an immune-suppressive (M2-like) phenotype. However, the molecular basis of the process is still unclear. MicroRNA (miRNA) comprises a group of small, non-coding RNAs that are broadly expressed by a variety of organisms and are involved in cell behaviors such as suppression or promotion of tumorigenesis. Here, we demonstrate that miR-19a-3p, broadly conserved among vertebrates, was downregulated in RAW264.7 macrophage cells of the M2 phenotype in conditoned medium of 4T1 mouse breast tumor cells. This downregulation correlated with an increased expression of the Fra-1 gene, which was reported to act as a pro-oncogene by supporting the invasion and progression of breast tumors. We found significant upregulation of miR-19a-3p in RAW264.7 macrophages after transfection with a miR-19a-3p mimic that resulted in a significant suppression of the expression of this gene. In addition, we could measure the activity of binding between miR-19a-3p and Fra-1 with a psiCHECK luciferase reporter system. Further, transfection of RAW264.7 macrophage cells with the miR-19a-3p mimic decreased the expression of the Fra-1 downstream genes VEGF, STAT3 and pSTAT3. Most importantly, the capacity of 4T1 breast tumor cells to migrate and invade was impaired in vivo by the intratumoral injection of miR-19a-3p. Taken together, these findings indicate that miR-19a-3p is capable of downregulating the M2 phenotype in M2 macrophages and that the low expression of this miRNA has an important role in the upregulation of Fra-1 expression and induction of M2 macrophage polarization.
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32
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Identification of a pharmacologically tractable Fra-1/ADORA2B axis promoting breast cancer metastasis. Proc Natl Acad Sci U S A 2013; 110:5139-44. [PMID: 23483055 DOI: 10.1073/pnas.1222085110] [Citation(s) in RCA: 137] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Metastasis confronts clinicians with two major challenges: estimating the patient's risk of metastasis and identifying therapeutic targets. Because they are key signal integrators connecting cellular processes to clinical outcome, we aimed to identify transcriptional nodes regulating cancer cell metastasis. Using rodent xenograft models that we previously developed, we identified the transcription factor Fos-related antigen-1 (Fra-1) as a key coordinator of metastasis. Because Fra-1 often is overexpressed in human metastatic breast cancers and has been shown to control their invasive potential in vitro, we aimed to assess the implication and prognostic significance of the Fra-1-dependent genetic program in breast cancer metastasis and to identify potential Fra-1-dependent therapeutic targets. In several in vivo assays in mice, we demonstrate that stable RNAi depletion of Fra-1 from human breast cancer cells strongly suppresses their ability to metastasize. These results support a clinically important role for Fra-1 and the genetic program it controls. We show that a Fra-1-dependent gene-expression signature accurately predicts recurrence of breast cancer. Furthermore, a synthetic lethal drug screen revealed that antagonists of the adenosine receptor A2B (ADORA2B) are preferentially toxic to breast tumor cells expressing Fra-1. Both RNAi silencing and pharmacologic blockade of ADORA2B inhibited filopodia formation and invasive activity of breast cancer cells and correspondingly reduced tumor outgrowth in the lungs. These data show that Fra-1 activity is causally involved in and is a prognostic indicator of breast cancer metastasis. They suggest that Fra-1 activity predicts responsiveness to inhibition of pharmacologically tractable targets, such as ADORA2B, which may be used for clinical interference of metastatic breast cancer.
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FOSL1 controls the assembly of endothelial cells into capillary tubes by direct repression of αv and β3 integrin transcription. Mol Cell Biol 2013; 33:1198-209. [PMID: 23319049 DOI: 10.1128/mcb.01054-12] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
To form three-dimensional capillary tubes, endothelial cells must establish contacts with the extracellular matrix that provides signals for their proliferation, migration, and differentiation. The transcription factor Fosl1 plays a key role in the vasculogenic and angiogenic processes as Fosl1 knockout embryos die with vascular defects in extraembryonic tissues. Here, we show that Fosl1(-/-) embryonic stem cells differentiate into endothelial cells but fail to correctly assemble into primitive capillaries and to form tube-like structures. FOSL1 silencing affects in vitro angiogenesis, increases cell adhesion, and decreases cell mobility of primary human endothelial cells (HUVEC). We further show that FOSL1 is a repressor of αv and β3 integrin expression and that the down-modulation of αvβ3 rescues the angiogenic phenotype in FOSL1-silenced HUVEC, while the ectopic expression of αvβ3 alone reproduces the phenotypic alterations induced by FOSL1 knockdown. FOSL1 represses the transcription of both αv and β3 integrin genes by binding together with JunD to their proximal promoter via the transcription factor SP1. These data suggest that FOSL1-dependent negative regulation of αvβ3 expression on endothelial cells is required for endothelial assembly into vessel structures.
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34
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Motrich RD, Castro GM, Caputto BL. Old players with a newly defined function: Fra-1 and c-Fos support growth of human malignant breast tumors by activating membrane biogenesis at the cytoplasm. PLoS One 2013; 8:e53211. [PMID: 23301044 PMCID: PMC3534677 DOI: 10.1371/journal.pone.0053211] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Accepted: 11/27/2012] [Indexed: 01/06/2023] Open
Abstract
A shared characteristic of tumor cells is their exacerbated growth. Consequently, tumor cells demand high rates of phospholipid synthesis required for membrane biogenesis to support their growth. c-Fos, in addition to its AP-1 transcription factor activity, is the only protein known up to date that is capable of activating lipid synthesis in normal and brain tumor tissue. For this latter activity, c-Fos associates to the endoplasmic reticulum (ER) through its N-terminal domain and activates phospholipid synthesis, an event that requires it Basic Domain (BD) (aa 139–159). Fra-1, another member of the FOS family of proteins, is over-expressed in human breast cancer cells and its BD is highly homologous to that of c-Fos with two conservative substitutions in its basic amino acids. Consequently, herein we examined if Fra-1 and/or c-Fos participate in growth of breast cancer cells by activating phospholipid synthesis as found previously for c-Fos in brain tumors. We found both Fra-1 and c-Fos over-expressed in >95% of human ductal breast carcinoma biopsies examined contrasting with the very low or undetectable levels in normal tissue. Furthermore, both proteins associate to the ER and activate phospholipid synthesis in cultured MCF7 and MDA-MB231 breast cancer cells and in human breast cancer samples. Stripping tumor membranes of Fra-1 and c-Fos prior to assaying their lipid synthesis capacity in vitro results in non-activated lipid synthesis levels that are restored to their initial activated state by addition of Fra-1 and/or c-Fos to the assays. In MDA-MB231 cells primed to proliferate, blocking Fra-1 and c-Fos with neutralizing antibodies blocks lipid-synthesis activation and cells do not proliferate. Taken together, these results disclose the cytoplasmic activity of Fra-1 and c-Fos as potential targets for controlling growth of breast carcinomas by decreasing the rate of membrane biogenesis required for growth.
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Affiliation(s)
- Ruben D. Motrich
- Centro de Investigaciones en Química Biológica de Córdoba, (Universidad Nacional de Córdoba-The National Scientific and Technical Research Council), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, Argentina
| | - Gonzalo M. Castro
- Centro de Investigaciones en Química Biológica de Córdoba, (Universidad Nacional de Córdoba-The National Scientific and Technical Research Council), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, Argentina
| | - Beatriz L. Caputto
- Centro de Investigaciones en Química Biológica de Córdoba, (Universidad Nacional de Córdoba-The National Scientific and Technical Research Council), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, Argentina
- * E-mail:
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Healy S, Khan P, Davie JR. Immediate early response genes and cell transformation. Pharmacol Ther 2013; 137:64-77. [DOI: 10.1016/j.pharmthera.2012.09.001] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Accepted: 09/06/2012] [Indexed: 01/20/2023]
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Kandelman JD, Waitzberg AFL, Szejnfeld J, Smith RL. Expression of claudin, paxillin and FRA-1 in non-nodular breast lesions in association with microcalcifications. SAO PAULO MED J 2013; 131:71-9. [PMID: 23657508 PMCID: PMC10871730 DOI: 10.1590/s1516-31802013000100016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Revised: 11/07/2011] [Accepted: 06/29/2012] [Indexed: 11/21/2022] Open
Abstract
CONTEXT AND OBJECTIVE The possible role of adhesion molecules in early breast carcinogenesis has been shown in the literature. We aimed to analyze early adhesion imbalances in non-nodular breast lesions and their association with precursor lesions, in order to ascertain whether these alterations exist and contribute towards early carcinogenesis. DESIGN AND SETTING Retrospective cross-sectional study based on medical records at a private radiological clinic in São Paulo, Brazil. METHODS We retrospectively reviewed the medical records of all consecutive women attended between August 2006 and July 2007 who presented mammographic evidence of breast microcalcifications classified as Breast Imaging Reporting and Data System Atlas (BI-RADS) type 4. These women underwent stereotaxic biopsy. Clinical, radiological and pathological data were collected, and immunohistochemical assays searched for claudin, paxillin, FRA-1 and HER-2. RESULTS Over this period, 127 patients were evaluated. Previous BI-RADS diagnoses showed that 69 cases were in category 4A, 47 in 4B and 11 in 4C. Morphological assessment showed benign entities in 86.5%. Most of the benign lesions showed preserved claudin expression, associated with paxillin (P < 0.001). Paxillin and HER-2 expressions were correlated. FRA-1 expression was also strongly associated with HER-2 expression (P < 0.001). CONCLUSIONS Although already present in smaller amounts, imbalance of adhesion molecules is not necessarily prevalent in non-nodular breast lesions. Since FRA-1 expression reached statistically significant correlations with radiological and morphological diagnoses and HER-2 status, it may have a predictive role in this setting.
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Affiliation(s)
- José David Kandelman
- Departments of Pathology, Radiology and Morphology, Universidade Federal de São Paulo Unifesp, São Paulo, Brazil.
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Soares MJ, Chakraborty D, Renaud SJ, Kubota K, Bu P, Konno T, Rumi MAK. Regulatory pathways controlling the endovascular invasive trophoblast cell lineage. J Reprod Dev 2012; 58:283-7. [PMID: 22790871 DOI: 10.1262/jrd.2011-039] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Hemochorial placentation is characterized by trophoblast-directed uterine spiral artery remodeling. The rat and human both possess hemochorial placentation and exhibit remarkable similarities regarding the depth of trophoblast invasion and the extent of uterine vascular modification. In vitro and in vivo research methodologies have been established using the rat as an animal model to investigate the extravillous/invasive trophoblast lineage. With these research approaches, two signaling pathways controlling the differentiation and invasion of the trophoblast cell lineage have been identified: i) hypoxia/hypoxia inducible factor and ii) phosphatidylinositol 3-kinase/AKT/Fos like antigen 1. Dissection of these pathways has facilitated identification of fundamental regulators of the invasive trophoblast cell lineage.
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Affiliation(s)
- Michael J Soares
- Institute for Reproductive Health and Regenerative Medicine, Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas 66160, USA.
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Yang S, Li Y, Gao J, Zhang T, Li S, Luo A, Chen H, Ding F, Wang X, Liu Z. MicroRNA-34 suppresses breast cancer invasion and metastasis by directly targeting Fra-1. Oncogene 2012; 32:4294-303. [PMID: 23001043 DOI: 10.1038/onc.2012.432] [Citation(s) in RCA: 185] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2012] [Revised: 07/10/2012] [Accepted: 08/04/2012] [Indexed: 02/07/2023]
Abstract
MicroRNAs have key roles in tumor metastasis. Here, we describe the regulation and function of miR-34a and miR-34c (miR-34a/c) in breast cancer metastasis. Expression analysis verified that miR-34a/c expression is significantly decreased in metastatic breast cancer cells and human primary breast tumors with lymph node metastases. Overexpression of miR-34a/c could inhibit breast cancer cell migration and invasion in vitro and distal pulmonary metastasis in vivo. Further studies revealed that Fos-related antigen 1 (Fra-1 or Fosl1) is a downstream target of miR-34a/c as miR-34a/c bound directly to the 3'untranslated region of Fra-1, subsequently reducing both the mRNA and protein levels of Fra-1. Silencing of Fra-1 recapitulated the effects of miR-34a/c overexpression, whereas enforced expression of Fra-1 reverses the suppressive effects of miR-34a/c. Moreover, significant downregulation of miR-34a in metastatic breast cancer tissues was found to be inversely correlated with Fra-1 expression. Our results demonstrate that miR-34a/c functions as a metastasis suppressor to regulate breast cancer migration and invasion through targeting Fra-1 oncogene and suggest a therapeutic application of miR-34 in breast cancer.
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Affiliation(s)
- S Yang
- State Key Laboratory of Molecular Oncology, Cancer Institute and Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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Antoon JW, Bratton MR, Guillot LM, Wadsworth S, Salvo VA, Elliott S, McLachlan JA, Burow ME. Pharmacology and anti-tumor activity of RWJ67657, a novel inhibitor of p38 mitogen activated protein kinase. Am J Cancer Res 2012; 2:446-458. [PMID: 22860234 PMCID: PMC3410584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Accepted: 06/17/2012] [Indexed: 06/01/2023] Open
Abstract
Endocrine therapy resistance is a primary cause of clinical breast cancer treatment failure. The p38 mitogen activated protein kinase (MAPK) signaling pathway is known to promote ligand independent tumor growth and resistance to endocrine therapy. In this study, we investigated the therapeutic potential of the p38 inhibitor RWJ67657 in the treatment of tamoxifen resistant MDA-MB-361 cells. RWJ67657 dose-dependently decreased both basal and stimulated activation of p38 MAPK signaling in this drug resistant cell system. Decreased activation of p38 by RWJ67657 resulted in inhibition of the downstream p38 targets hsp27 and MAPKAPK. Diminished p38 signaling resulted in inhibition of p38-medated gene transcription. Furthermore, pharmacological inhibition of p38 by RWJ67657 decreased biological effects of p38, including ER-mediated gene expression and clonogenic survival in a dose-dependent manner. Animal studies revealed significantly decreased p38 signaling in vivo following exposure to RWJ67657. Treatment with the inhibitor markedly decreased phosphorylation of p38 in MDA-MB-361 tumors, leading to decreased transcription of both Fra-1 and progesterone receptor. Utilizing well-established xenograft tumor models, we demonstrated that RWJ67657 exhibits potent anti-tumor properties. Treatment with RWJ67657 markedly decreased tamoxifen resistant tumor growth, both in the presence and absence of estrogen. Taken together, our findings demonstrate the therapeutic potential of targeting the p38-MAPK signaling cascade in the treatment of endocrine resistant breast cancer.
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Affiliation(s)
- James W Antoon
- Department Medicine, Section of Hematology & Medical Oncology, Tulane University School of MedicineNew Orleans, LA 70112, USA
| | - Melyssa R Bratton
- Department of Pharmacology, Tulane University School of MedicineNew Orleans, LA 70112, USA
| | - Lori M Guillot
- Department Medicine, Section of Hematology & Medical Oncology, Tulane University School of MedicineNew Orleans, LA 70112, USA
| | | | - Virgilio A Salvo
- Department Medicine, Section of Hematology & Medical Oncology, Tulane University School of MedicineNew Orleans, LA 70112, USA
| | - Steven Elliott
- Department Medicine, Section of Hematology & Medical Oncology, Tulane University School of MedicineNew Orleans, LA 70112, USA
| | - John A McLachlan
- Department of Pharmacology, Tulane University School of MedicineNew Orleans, LA 70112, USA
| | - Matthew E Burow
- Department Medicine, Section of Hematology & Medical Oncology, Tulane University School of MedicineNew Orleans, LA 70112, USA
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The PKCθ pathway participates in the aberrant accumulation of Fra-1 protein in invasive ER-negative breast cancer cells. Oncogene 2012; 31:4889-97. [PMID: 22286759 DOI: 10.1038/onc.2011.659] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Fra-1 is aberrantly expressed in a large number of cancer cells and tissues, and emerging evidence suggests an important role for this Fos family protein in both oncogenesis and the progression or maintenance of many tumour types. Here, we show that the concentration of Fra-1 is high in invasive oestrogen receptor (ER)-negative (ER-) breast cancer cell lines, regardless of their Ras pathway status. All of the ER- cells express high levels of activated PKCθ, and the inhibition of PKCθ activity using RNA interference or the expression of a dominant-negative mutant results in a dramatic reduction in Fra-1 abundance. Conversely, the ectopic expression of constitutively active PKCθ leads to Fra-1 phosphorylation and accumulation in poorly invasive ER+ cells. This accumulation is due to the stabilisation of the Fra-1 protein through PKCθ signalling, whereas other members of the PKC family are ineffective. Both Ste20-related proline-alanine-rich kinase (SPAK) and ERK1/2, whose activities are upregulated by PKCθ, participate in PKCθ-driven Fra-1 stabilisation. Interestingly, their relative contributions appear to be different depending on the cell line studied. ERK1/2 signalling has a major role in ER- MDA-MB-231 cells, whereas Fra-1 accumulation occurs mainly through SPAK signalling in ER- BT549 cells. Fra-1 mutational analysis shows that the phosphorylation of S265, T223 and T230 is critical for PKCθ-driven Fra-1 stabilisation. Phosphorylation of the protein was confirmed using specific antisera against Fra-1 phosphorylated on T223 or S265. In addition, Fra-1 participates in PKCθ-induced cell invasion and is necessary for PKCθ-induced cell migration. In summary, we identified PKCθ signalling as an important regulator of Fra-1 accumulation in ER- breast cancer cells. Moreover, our results suggest that PKCθ could participate in progression of some breast cancers and could be a new therapeutic target.
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Gene expression profiling identifies sST2 as an effector of ErbB2-driven breast carcinoma cell motility, associated with metastasis. Oncogene 2011; 31:3516-24. [DOI: 10.1038/onc.2011.525] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Usui A, Hoshino I, Akutsu Y, Sakata H, Nishimori T, Murakami K, Kano M, Shuto K, Matsubara H. The molecular role of Fra-1 and its prognostic significance in human esophageal squamous cell carcinoma. Cancer 2011; 118:3387-96. [PMID: 22028113 DOI: 10.1002/cncr.26652] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2011] [Revised: 08/22/2011] [Accepted: 09/07/2011] [Indexed: 11/10/2022]
Abstract
BACKGROUND The expression of Fra-1 (Fos related antigen 1) involves tumor progression and invasion, and its gene ablation could suppress the invasive phenotypes of human tumor cells. The authors investigated the significance of Fra-1 expression in esophageal squamous cell carcinoma (ESCC) and studied the effect of its down-regulation on cell proliferation, motility, and invasion. METHODS Surgical specimens from 164 patients with ESCC were evaluated. Fra-1 expression in the primary tumor along with metastatic lymph nodes was compared among various clinicopathological characteristics, and overall survival was analyzed. The rate and intensity of Fra-1 immunoreactivity were also investigated. The molecular role of Fra-1 was assessed by its down-regulation in human ESCC cell lines. RESULTS Fra-1 expression was positive in 127 (77.4%) ESCC patients. Immunoreactivity was localized to the marginal areas of the ESCC tumors. Positive Fra-1 expression correlated with depth of tumor, lymph node metastasis, stage, and infiltrative growth pattern. A significant difference was seen in the survival between tumors with and without Fra-1, and positive Fra-1 expression was revealed to be an independent factor related to poor prognosis. Patients with metastatic lymph nodes with positive Fra-1 expression presented decreased survival compared with negative Fra-1 expression. After the down-regulation of Fra-1 expression, a significant decrease in cell proliferation, motility, and invasion was observed. CONCLUSIONS This study demonstrated ESCC patients positive for Fra-1 to be associated with poor prognosis. The findings also suggest that Fra-1 regulation may play an important role in the progression of ESCC.
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Affiliation(s)
- Akihiro Usui
- Department of Frontier Surgery, Chiba University Graduate School of Medicine, Chiba, Japan
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Abstract
Remodeling of uterine spiral arteries by trophoblast cells is a requisite process for hemochorial placentation and successful pregnancy. The rat exhibits deep intrauterine trophoblast invasion and accompanying trophoblast-directed vascular modification. The involvement of phosphatidylinositol 3 kinase (PI3K), AKT, and Fos-like antigen 1 (FOSL1) in regulating invasive trophoblast and hemochorial placentation was investigated using Rcho-1 trophoblast stem cells and rat models. Disruption of PI3K/AKT with small-molecule inhibitors interfered with the differentiation-dependent elaboration of a signature invasive-vascular remodeling trophoblast gene expression profile and trophoblast invasion. AKT isoform-specific knockdown also affected the signature invasive-vascular remodeling trophoblast gene expression profile. Nuclear FOSL1 increased during trophoblast cell differentiation in a PI3K/AKT-dependent manner. Knockdown of FOSL1 disrupted the expression of a subset of genes associated with the invasive-vascular remodeling trophoblast phenotype, including the matrix metallopeptidase 9 gene (Mmp9). FOSL1 was shown to occupy regions of the Mmp9 promoter in trophoblast cells critical for the regulation of Mmp9 gene expression. Inhibition of FOSL1 expression also abrogated trophoblast invasion, as assessed in vitro and following in vivo trophoblast-specific lentivirally delivered FOSL1 short hairpin RNA (shRNA). In summary, FOSL1 is a key downstream effector of the PI3K/AKT signaling pathway responsible for development of trophoblast lineages integral to establishing the maternal-fetal interface.
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Pennanen PT, Sarvilinna NS, Toimela T, Ylikomi TJ. Inhibition of FOSL1 overexpression in antiestrogen-resistant MCF-7 cells decreases cell growth and increases vacuolization and cell death. Steroids 2011; 76:1063-8. [PMID: 21570421 DOI: 10.1016/j.steroids.2011.04.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2011] [Revised: 04/19/2011] [Accepted: 04/20/2011] [Indexed: 12/01/2022]
Abstract
Elevated activator protein-1 (AP-1) activity in breast cancer cells has been linked to Tamoxifen (TAM) resistance. Fos-like antigen-1 (FOSL1) is a member of the AP-1 transcription factor and is overexpressed in a variety of human cancers including breast tumors. We have previously established an estrogen-independent and antiestrogen Toremifene (TOR)-resistant subline of MCF-7 breast cancer cells. In these cells, the expression of FOSL1 is upregulated when compared to the parental cells. In the present study, partial inhibition of FOSL1 expression in these cells by small interfering RNA resulted in a marked decrease of cell growth. The inhibition of cell growth paralleled with changes in cell morphology such as increased formation of vacuoles followed by an increase in the number of dead cells. The inhibition of FOSL1 expression in these cells also restored sensitivity to TOR. Our results suggest that chemotherapy targeting overexpression of FOSL1 could be a potent strategy for treating endocrine resistant breast cancers.
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Affiliation(s)
- Pasi T Pennanen
- Department of Cell Biology, Medical School, FIN-33014, University of Tampere, Finland.
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Pakay JL, Diesch J, Gilan O, Yip YY, Sayan E, Kolch W, Mariadason JM, Hannan RD, Tulchinsky E, Dhillon AS. A 19S proteasomal subunit cooperates with an ERK MAPK-regulated degron to regulate accumulation of Fra-1 in tumour cells. Oncogene 2011; 31:1817-24. [DOI: 10.1038/onc.2011.375] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Fra-1 controls motility of bladder cancer cells via transcriptional upregulation of the receptor tyrosine kinase AXL. Oncogene 2011; 31:1493-503. [PMID: 21822309 DOI: 10.1038/onc.2011.336] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Fos-related antigen 1 (Fra-1) is a Fos family member overexpressed in several types of human cancers. Here, we report that Fra-1 is highly expressed in the muscle-invasive form of the carcinoma of the bladder (80%) and to a lesser extent in superficial bladder cancer (42%). We demonstrate that in this type of cancer Fra-1 is regulated via a C-terminal instability signal and C-terminal phosphorylation. We show that manipulation of Fra-1 expression levels in bladder cancer cell lines affects cell morphology, motility and proliferation. The gene coding for AXL tyrosine kinase is directly upregulated by Fra-1 in bladder cancer and in other cell lines. Importantly, our data demonstrate that AXL mediates the effect of Fra-1 on tumour cell motility but not on cell proliferation. We suggest that AXL may represent an attractive therapeutic target in cancers expressing high Fra-1 levels.
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Schindler AJ, Sherwood DR. The transcription factor HLH-2/E/Daughterless regulates anchor cell invasion across basement membrane in C. elegans. Dev Biol 2011; 357:380-91. [PMID: 21784067 DOI: 10.1016/j.ydbio.2011.07.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2011] [Revised: 06/17/2011] [Accepted: 07/07/2011] [Indexed: 10/18/2022]
Abstract
Cell invasion through basement membrane is a specialized cellular behavior critical for many developmental processes and leukocyte trafficking. Invasive cellular behavior is also inappropriately co-opted during cancer progression. Acquisition of an invasive phenotype is accompanied by changes in gene expression that are thought to coordinate the steps of invasion. The transcription factors responsible for these changes in gene expression, however, are largely unknown. C. elegans anchor cell (AC) invasion is a genetically tractable in vivo model of invasion through basement membrane. AC invasion requires the conserved transcription factor FOS-1A, but other transcription factors are thought to act in parallel to FOS-1A to control invasion. Here we identify the transcription factor HLH-2, the C. elegans ortholog of Drosophila Daughterless and vertebrate E proteins, as a regulator of AC invasion. Reduction of HLH-2 function by RNAi or with a hypomorphic allele causes defects in AC invasion. Genetic analysis indicates that HLH-2 has functions outside of the FOS-1A pathway. Using expression analysis, we identify three genes that are transcriptionally regulated by HLH-2: the protocadherin cdh-3, and two genes encoding secreted extracellular matrix proteins, mig-6/papilin and him-4/hemicentin. Further, we show that reduction of HLH-2 function causes defects in polarization of F-actin to the invasive cell membrane, a process required for the AC to generate protrusions that breach the basement membrane. This work identifies HLH-2 as a regulator of the invasive phenotype in the AC, adding to our understanding of the transcriptional networks that control cell invasion.
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Zhang L, Ye DX, Pan HY, Wei KJ, Wang LZ, Wang XD, Shen GF, Zhang ZY. Yes-associated protein promotes cell proliferation by activating Fos Related Activator-1 in oral squamous cell carcinoma. Oral Oncol 2011; 47:693-7. [PMID: 21708480 DOI: 10.1016/j.oraloncology.2011.06.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2011] [Revised: 03/23/2011] [Accepted: 06/03/2011] [Indexed: 01/30/2023]
Abstract
In our previous study, we established an in vitro cellular carcinogenesis model of oral squamous cell carcinoma (OSCC), including a human immortalized oral epithelial cell (HIOEC) and a cancerous cell line (HB96). Microarray analysis showed that the gene encoding Yes-associated protein (YAP) was significantly increased in HB96 cells compared with HIOEC cells. But the underlying mechanism of YAP on oncogenesis, especially its downstream targets, are still not clear. YAP expression in OSCC cell lines and tissue specimens were investigated by using real-time PCR, western blotting and immunohistochemistry staining. YAP put-back plasmid with four mutation sites after YAP-siRNA interference was constructed by site-directed mutagenesis. Cell growth and colony formation were observed after YAP-siRNA interference or YAP put-back again in CAL27 cells. YAP expression was increased in the cellular carcinogenesis models and the clinical samples from primary OSCC patients. Inhibition of YAP by siRNA interference in CAL27 cells significantly inhibited cell proliferation and colony formation in soft agar, but these abilities were rescued when YAP was put-back again. At the same time, Fos Related Activator-1 (Fra-1) was down-regulated when YAP was inhibited by siRNA interference while Fra-1 was rescued when YAP was put-back again. Immunohistochemistry results also indicated that higher levels of YAP were significantly associated with Fra-1 overexpression in OSCC clinical samples. YAP could promote cell proliferation by activating transcription factor Fra-1 in oral squamous cell carcinoma.
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Affiliation(s)
- Lei Zhang
- Department of Oral and Maxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China
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Stinson S, Lackner MR, Adai AT, Yu N, Kim HJ, O'Brien C, Spoerke J, Jhunjhunwala S, Boyd Z, Januario T, Newman RJ, Yue P, Bourgon R, Modrusan Z, Stern HM, Warming S, de Sauvage FJ, Amler L, Yeh RF, Dornan D. TRPS1 targeting by miR-221/222 promotes the epithelial-to-mesenchymal transition in breast cancer. Sci Signal 2011; 4:ra41. [PMID: 21673316 DOI: 10.1126/scisignal.2001538] [Citation(s) in RCA: 223] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The basal-like subtype of breast cancer has an aggressive clinical behavior compared to that of the luminal subtype. We identified the microRNAs (miRNAs) miR-221 and miR-222 (miR-221/222) as basal-like subtype-specific miRNAs and showed that expression of miR-221/222 decreased expression of epithelial-specific genes and increased expression of mesenchymal-specific genes, and increased cell migration and invasion in a manner characteristic of the epithelial-to-mesenchymal transition (EMT). The transcription factor FOSL1 (also known as Fra-1), which is found in basal-like breast cancers but not in the luminal subtype, stimulated the transcription of miR-221/222, and the abundance of these miRNAs decreased with inhibition of the epidermal growth factor receptor (EGFR) or MEK (mitogen-activated or extracellular signal-regulated protein kinase kinase), placing miR-221/222 downstream of the RAS pathway. Furthermore, miR-221/222-mediated reduction in E-cadherin abundance depended on their targeting the 3' untranslated region of the GATA family transcriptional repressor TRPS1 (tricho-rhino-phalangeal syndrome type 1), which inhibited EMT by decreasing ZEB2 (zinc finger E-box-binding homeobox2) expression. We conclude that by promoting EMT, miR-221/222 may contribute to the more aggressive clinical behavior of basal-like breast cancers.
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Affiliation(s)
- Susanna Stinson
- Department of Molecular Diagnostics and Cancer Cell Biology, Genentech Inc., South San Francisco, CA 94080, USA
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PMA up-regulates the transcription of Axl by AP-1 transcription factor binding to TRE sequences via the MAPK cascade in leukaemia cells. Biol Cell 2011; 103:21-33. [PMID: 20977427 DOI: 10.1042/bc20100094] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND Axl is a receptor tyrosine kinase promoting anti-apoptosis, invasion and mitogenesis, and is highly expressed in different solid cancers. Axl basal transcriptional activity is driven by Sp1/Sp3, and overexpression of MZF-1 (myeloid zinc-finger 1) induces Axl transcription and gene expression. Furthermore, Axl expression is epigenetically controlled by CpG hypermethylation; however, little is known about inducible Axl gene expression and Axl regulation in haematopoetic malignancies. RESULTS In the present study, we studied Axl transcriptional regulation under PMA-stimulated conditions in leukaemia cells. Luciferase analysis with sequential 5'-deletion constructs revealed that the -660/-580 region of the Axl promoter is indispensable for induced promoter activity under PMA stimulation. This region includes AP-1 (activator protein 1)/CREB [CRE (cAMP-response-element)-binding protein] motifs, five times partially overlapping TGCGTG repeats and multiple GT repeats. Mutational, supershift and ChIP (chromatin immunoprecipitation) analysis determined that AP-1 family members bind to AP-1 motifs and to the 5 × TGCGTG overlapping repeats, thus transactivating Axl promoter activity. Furthermore, specific inhibitors of PKC (protein kinase C), ERK1/2 (extracellular-signal-regulated kinase 1/2) and p38 reduced Axl expression. Additionally, mithramycin treatment abolished constitutive and PMA-induced Axl expression. CONCLUSIONS Taken together the results of the present study suggest that PMA-induced Axl gene expression in leukaemia cells is mediated by AP-1 motifs and 5 × TGCGTG repeats within the promoter region -660/-580, and through the PKC/ERK1/2/AP-1 or PKC/p-38/AP-1 signalling axis.
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