1
|
Sun L, Xing G, Wang W, Ma X, Bu X. Proliferation-associated 2G4 P48 is stabilized by malignant T-cell amplified sequence 1 and promotes the proliferation of head and neck squamous cell carcinoma. J Dent Sci 2023; 18:1588-1597. [PMID: 37799877 PMCID: PMC10548002 DOI: 10.1016/j.jds.2023.02.020] [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: 02/01/2023] [Revised: 02/19/2023] [Indexed: 03/09/2023] Open
Abstract
Background/purpose Proliferation-associated protein 2G4 (PA2G4) has alternative transcriptional and translational initiation. One dominant transcript ENST00000303305 could be translated into two protein isoforms (PA2G4-P42 and PA2G4-P48). In this study, we aimed to explore the effects of PA2G4-P42 and PA2G4-P48 on the proliferation of head and neck squamous cell carcinoma (HNSCC) and the mechanisms regulating PA2G4-P48 stability. Materials and methods HNSCC cell lines HSC2 and SCC25 with relatively low PA2G4 expression were used for in-vitro cell studies. PA2G4-P42 and PA2G4-P48 overexpression lentiviruses were generated. In vitro cell proliferation was assessed by CCK-8 and colony formation. In vivo tumor cell proliferation was assessed by HSC2 cell-derived xenograft tumors. Liquid chromatography-mass spectrometry (LC-MS)/MS and co-immunoprecipitation (co-IP) assays were applied to check PA2G4-P48 interacting partners. Cycloheximide (CHX) chase and ubiquitin-based co-IP assays were also performed. Results PA2G4-P48 was the dominant isoform, with substantially higher expression than PA2G4-P42 in HNSCC. PA2G4-P48 overexpression enhanced HNSCC cell proliferation, but PA2G4-P42 overexpression slowed the proliferation. MCTS1 interacted with PA2G4-P48, but not PA2G4-P42. PA2G4 protein but not its mRNA expression was decreased in cells with MCTS1 knockdown. MG132 treatment abrogated this alteration. MCTS1 overexpression significantly elevated the half-life of PA2G4-P48, while its knockdown drastically reduced the half-life compared with the control cells. In addition, MCTS1 overexpression significantly decreased the polyubiquitination of exogenous flag-tagged PA2G4-P48. MCTS1 overexpression-induced cell proliferation was hampered by knocking down of PA2G4-P48. Conclusion PA2G4-P42 and PA2G4-P48 exert growth-suppressive and growth-promoting effects in HNSCC, respectively. MCTS1 can interact with PA2G4-P48 and prolong its half-life by reducing its poly-ubiquitination.
Collapse
Affiliation(s)
- Legang Sun
- Department of Oral and Maxillofacial Surgery, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Guoyi Xing
- Department of Oral and Maxillofacial Surgery, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Wenlong Wang
- Department of Oral and Maxillofacial Surgery, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Xiangrui Ma
- Department of Oral and Maxillofacial Surgery, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Xiangbin Bu
- Department of Oral and Maxillofacial Surgery, Binzhou Medical University Hospital, Binzhou, Shandong, China
| |
Collapse
|
2
|
Bao Y, Cui J, Yue Y, Cao S, Li X, Liu L. ERBB3 binding protein 1 promotes the progression of malignant melanoma through activation of the Wnt/ β-catenin signaling pathway. Cancer Cell Int 2022; 22:44. [PMID: 35093077 PMCID: PMC8800265 DOI: 10.1186/s12935-022-02473-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 01/16/2022] [Indexed: 12/02/2022] Open
Abstract
Background Malignant melanoma (MM) is highly metastatic and has the highest mortality rate in patients with skin cancer. The ERBB3 binding protein 1 (Ebp1) has been linked to the onset and progression of a number of malignancies. However, the role of Ebp1 in MM has not yet been reported. Methods Multiple databases were analyzed for comparing the expression of Ebp1 in normal skin and MM. Ebp1 expression was knocked down in A375 and B16 cells, and the impact of Ebp1 on the cell growth was tested by CCK-8, plate clone colony, and cell cycle assays. Scratch, transwell, and in vivo caudal vein lung metastasis tests were also used to confirm the effects of Ebp1 on melanoma cells migration, invasion, and metastasis. Furthermore, the possible molecular mechanism of Ebp1 was predicted by set enrichment analysis and verified by western blotting. Results Ebp1 expression was substantially higher in MM than it was in normal skin, and Ebp1 was linked to the clinical stage and lymph node metastases of patients with MM. Knockdown of Ebp1 inhibited cell proliferation, migration, and invasion. In vivo experiments further verified that the knockdown of Ebp1 had an obvious inhibitory effect on lung metastasis in nude mice. Knockdown of Ebp1 reduced vimentin, N-cadherin, slug, and snail expression while increasing E-cadherin expression. Furthermore, knockdown of Ebp1 reduced the expression of β-catenin, as well as its downstream targets CyclinD1 and p-GSK3β; however, a Wnt/β-catenin agonist could reverse this effect. Conclusion Ebp1 may promote the proliferation and metastasis of melanoma cells through activation of the Wnt/β-catenin pathway. Graphical Abstract ![]()
Collapse
|
3
|
Kanjanapruthipong T, Sukphopetch P, Reamtong O, Isarangkul D, Muangkaew W, Thiangtrongjit T, Sansurin N, Fongsodsri K, Ampawong S. Cytoskeletal Alteration Is an Early Cellular Response in Pulmonary Epithelium Infected with Aspergillus fumigatus Rather than Scedosporium apiospermum. MICROBIAL ECOLOGY 2022; 83:216-235. [PMID: 33890146 DOI: 10.1007/s00248-021-01750-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 04/02/2021] [Indexed: 06/12/2023]
Abstract
Invasive aspergillosis and scedosporiosis are life-threatening fungal infections with similar clinical manifestations in immunocompromised patients. Contrarily, Scedosporium apiospermum is susceptible to some azole derivative but often resistant to amphotericin B. Histopathological examination alone cannot diagnose these two fungal species. Pathogenesis studies could contribute to explore candidate protein markers for new diagnosis and treatment methods leading to a decrease in mortality. In the present study, proteomics was conducted to identify significantly altered proteins in A549 cells infected with or without Aspergillus fumigatus and S. apiospermum as measured at initial invasion. Protein validation was performed with immunogold labelling alongside immunohistochemical techniques in infected A549 cells and lungs from murine models. Further, cytokine production was measured, using the Bio-Plex-Multiplex immunoassay. The cytoskeletal proteins HSPA9, PA2G4, VAT1, PSMA2, PEX1, PTGES3, KRT1, KRT9, CLIP1 and CLEC20A were mainly changed during A. fumigatus infection, while the immunologically activated proteins WNT7A, GAPDH and ANXA2 were principally altered during S. apiospermum infection. These proteins are involved in fungal internalisation and structural destruction leading to pulmonary disorders. Interleukin (IL)-21, IL-1α, IL-22, IL-2, IL-8, IL-12, IL-17A, interferon-γ and tumour necrosis factor-α were upregulated in both aspergillosis and scedosporiosis, although more predominately in the latter, in accordance with chitin synthase-1 and matrix metalloproteinase levels. Our results demonstrated that during invasion, A. fumigatus primarily altered host cellular integrity, whereas S. apiospermum chiefly induced and extensively modulated host immune responses.
Collapse
Affiliation(s)
- Tapanee Kanjanapruthipong
- Department of Tropical Pathology, Faculty of Tropical Medicine, Mahidol University, Ratchawithi Road, Ratchathewi, Bangkok, 10400, Thailand
| | - Passanesh Sukphopetch
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University, Ratchawithi Road, Ratchathewi, Bangkok, 10400, Thailand
| | - Onrapak Reamtong
- Department of Molecular Tropical Medicine and Genetic, Faculty of Tropical Medicine, Mahidol University, Ratchawithi Road, Ratchathewi, Bangkok, 10400, Thailand
| | - Duangnate Isarangkul
- Department of Microbiology, Faculty of Science, Mahidol University, 272, Rama VI Road, Ratchathewi, Bangkok, 10400, Thailand
| | - Watcharamat Muangkaew
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University, Ratchawithi Road, Ratchathewi, Bangkok, 10400, Thailand
| | - Tipparat Thiangtrongjit
- Department of Molecular Tropical Medicine and Genetic, Faculty of Tropical Medicine, Mahidol University, Ratchawithi Road, Ratchathewi, Bangkok, 10400, Thailand
| | - Nichapa Sansurin
- Northeast Laboratory Animal Center, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Kamonpan Fongsodsri
- Department of Tropical Pathology, Faculty of Tropical Medicine, Mahidol University, Ratchawithi Road, Ratchathewi, Bangkok, 10400, Thailand
| | - Sumate Ampawong
- Department of Tropical Pathology, Faculty of Tropical Medicine, Mahidol University, Ratchawithi Road, Ratchathewi, Bangkok, 10400, Thailand.
| |
Collapse
|
4
|
Bao Y, Suvesh M, Li X, Bai X, Li H, Li X, Xu D, Liu L. Ebp1 p48 promotes oncogenic properties in hepatocellular carcinoma through p38 MAPK/HIF1α activation and p53 downregulation. Mol Carcinog 2021; 60:252-264. [PMID: 33634940 DOI: 10.1002/mc.23288] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 02/05/2021] [Accepted: 02/08/2021] [Indexed: 12/21/2022]
Abstract
The ErbB3 binding protein 1 (Ebp1) has been reported in several cancers, in which it can act as either a pro-oncogenic regulator or a tumor suppressor. However, the biological function and molecular mechanism of Ebp1 p48 in hepatocellular carcinoma (HCC) remain unclear. Here, we report that the long isoform of Ebp1, p48, is highly expressed in HCC tissues compared with normal tissues. Ebp1 p48 expression was correlated with the tumor size in HCC patients. Silencing Ebp1 p48 by transduction with lentiviral shEbp1 dramatically reduced the proliferation rate, soft agar colony generation, and tumor formation in vivo. We further demonstrated that Ebp1 p48 knockdown resulted in decreased p38 phosphorylation, which subsequently reduced hypoxia-inducible factor 1α (HIF1α) expression. Moreover, Ebp1 p48 knockdown led to an upregulation of p53 expression through MDM2 downregulation. Taken together, these results suggest that the Ebp1/p38/HIF1α signaling pathway and the Ebp1-mediated downregulation of p53 are involved in hepatocarcinogenesis. Therefore, Ebp1 and its downstream signaling pathways may be promising therapeutic targets of HCC.
Collapse
Affiliation(s)
- Yanqiu Bao
- Department of Pathology, Affiliated Hospital of Yanbian University, Jilin, China
| | - Munakarmi Suvesh
- Division of GI and Hepatology, Departments of Internal Medicine, The Research Institute of Clinical Medicine, Chonbuk National University Medical School and Hospital, Jeonju, Jeonbuk, Republic of Korea
| | - Xiaobo Li
- Department of Pathology, Affiliated Hospital of Yanbian University, Jilin, China
| | - Xin Bai
- Department of Pathology, Affiliated Hospital of Yanbian University, Jilin, China
| | - Hua Li
- Department of Pathology, Affiliated Hospital of Yanbian University, Jilin, China.,Division of GI and Hepatology, Departments of Internal Medicine, The Research Institute of Clinical Medicine, Chonbuk National University Medical School and Hospital, Jeonju, Jeonbuk, Republic of Korea
| | - Xiangdan Li
- Center of Morphological Experiment, Medical College of Yanbian University, Jilin, China
| | - Dongyuan Xu
- Center of Morphological Experiment, Medical College of Yanbian University, Jilin, China
| | - Lan Liu
- Department of Pathology, Affiliated Hospital of Yanbian University, Jilin, China
| |
Collapse
|
5
|
Liu J, Xu C, Xu D, Cao L, Xue H, Meng Q, Niu Y. The expression and prognostic role of EBP1 and relationship with AR in HER2+ breast cancer. Virchows Arch 2020; 477:279-289. [PMID: 32086588 DOI: 10.1007/s00428-020-02773-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 02/04/2020] [Accepted: 02/10/2020] [Indexed: 12/29/2022]
Abstract
Human epidermal growth factor receptor (HER)-2 positive (HER2+) breast cancer (BC) has a poor survival rate and is more aggressive in nature. HER2-targeting agents could be beneficial for patients with HER2+ BC. In addition, targeted therapy and chemotherapy have been successfully used. However, a few patients are resistant to treatment. ErbB3 binding protein 1 (EBP1) binds to HER3 and inhibits the proliferation and invasive potential of tumor cells. However, its role in HER2+ BC has not been demonstrated. In this study, we aimed to analyze the relationship between androgen receptor (AR) and EBP1 expression in HER2+ BC. A total of 282 cases (140 cases of HER2+ invasive BC and 142 HER2-negative invasive BC) were included in this study. We performed immunohistochemistry (IHC) to analyze the expression of AR and EBP1; thereafter, we evaluated the relationship between these two biomarkers and estrogen receptor (ER), progesterone receptor (PR), HER2, p53, Ki67 expression, and other clinicopathological parameters. Of the HER2+ cases, 67 (47.9%) showed high expression of EBP1 (EBP1high) and 73 (52.1%) showed low/no expression of EBP1 (EBP1low/no). EBP1 expression was correlated with AR expression, histological grade, and lymphatic metastasis (p < 0.001, < 0.001, and 0.013, respectively). Kaplan-Meier analysis revealed that AR+ and EBP1low/no group had poorer overall survival (OS) and disease-free survival (DFS) compared with other groups (AR- and EBP1low/no, AR+ and EBP1high, and AR- and EBP1high). AR+ and EBP1low/no expression were independent prognostic factors for OS and DFS in HER2+ BC. This study showed the clinicopathological role of EBP1 and AR in HER2+ BC. Targeting EBP1 may be an effective treatment strategy for patients with AR+ HER2+ BC.
Collapse
Affiliation(s)
- Jing Liu
- Department of Breast Cancer Pathology and Research Laboratory, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China.,National Clinical Research Center for Cancer,Tianjin Medical University Cancer Institute and Hospital, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China.,Key Laboratory of Cancer Prevention and Therapy,Tianjin, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, Tianjin, China.,Tianjin's Clinical Research Center for Cancer, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China.,Key Laboratory of Breast Cancer Prevention and Therapy, Tianjin Medical University, Ministry of Education, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China
| | - Cong Xu
- Department of Breast Cancer Pathology and Research Laboratory, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China.,National Clinical Research Center for Cancer,Tianjin Medical University Cancer Institute and Hospital, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China.,Key Laboratory of Cancer Prevention and Therapy,Tianjin, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, Tianjin, China.,Tianjin's Clinical Research Center for Cancer, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China.,Key Laboratory of Breast Cancer Prevention and Therapy, Tianjin Medical University, Ministry of Education, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China
| | - Danni Xu
- Department of Breast Cancer Pathology and Research Laboratory, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China.,National Clinical Research Center for Cancer,Tianjin Medical University Cancer Institute and Hospital, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China.,Key Laboratory of Cancer Prevention and Therapy,Tianjin, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, Tianjin, China.,Tianjin's Clinical Research Center for Cancer, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China.,Key Laboratory of Breast Cancer Prevention and Therapy, Tianjin Medical University, Ministry of Education, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China
| | - Lu Cao
- Department of Breast Cancer Pathology and Research Laboratory, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China.,National Clinical Research Center for Cancer,Tianjin Medical University Cancer Institute and Hospital, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China.,Key Laboratory of Cancer Prevention and Therapy,Tianjin, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, Tianjin, China.,Tianjin's Clinical Research Center for Cancer, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China.,Key Laboratory of Breast Cancer Prevention and Therapy, Tianjin Medical University, Ministry of Education, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China
| | - Huiqin Xue
- Department of Breast Cancer Pathology and Research Laboratory, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China.,National Clinical Research Center for Cancer,Tianjin Medical University Cancer Institute and Hospital, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China.,Key Laboratory of Cancer Prevention and Therapy,Tianjin, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, Tianjin, China.,Tianjin's Clinical Research Center for Cancer, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China.,Key Laboratory of Breast Cancer Prevention and Therapy, Tianjin Medical University, Ministry of Education, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China
| | - Qingxiang Meng
- Department of Breast Cancer Pathology and Research Laboratory, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China.,National Clinical Research Center for Cancer,Tianjin Medical University Cancer Institute and Hospital, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China.,Key Laboratory of Cancer Prevention and Therapy,Tianjin, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, Tianjin, China.,Tianjin's Clinical Research Center for Cancer, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China.,Key Laboratory of Breast Cancer Prevention and Therapy, Tianjin Medical University, Ministry of Education, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China
| | - Yun Niu
- Department of Breast Cancer Pathology and Research Laboratory, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China. .,National Clinical Research Center for Cancer,Tianjin Medical University Cancer Institute and Hospital, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China. .,Key Laboratory of Cancer Prevention and Therapy,Tianjin, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, Tianjin, China. .,Tianjin's Clinical Research Center for Cancer, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China. .,Key Laboratory of Breast Cancer Prevention and Therapy, Tianjin Medical University, Ministry of Education, West Huanhu Road, Ti Yuan Bei, Hexi District, Tianjin, 300060, China.
| |
Collapse
|
6
|
Roles of ErbB3-binding protein 1 (EBP1) in embryonic development and gene-silencing control. Proc Natl Acad Sci U S A 2019; 116:24852-24860. [PMID: 31748268 DOI: 10.1073/pnas.1916306116] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
ErbB3-binding protein 1 (EBP1) is implicated in diverse cellular functions, including apoptosis, cell proliferation, and differentiation. Here, by generating genetic inactivation of Ebp1 mice, we identified the physiological roles of EBP1 in vivo. Loss of Ebp1 in mice caused aberrant organogenesis, including brain malformation, and death between E13.5 and 15.5 owing to severe hemorrhages, with massive apoptosis and cessation of cell proliferation. Specific ablation of Ebp1 in neurons caused structural abnormalities of brain with neuron loss in [Nestin-Cre; Ebp1 flox/flox ] mice. Notably, global methylation increased with high levels of the gene-silencing unit Suv39H1/DNMT1 in Ebp1-deficient mice. EBP1 repressed the transcription of Dnmt1 by binding to its promoter region and interrupted DNMT1-mediated methylation at its target gene, Survivin promoter region. Reinstatement of EBP1 into embryo brain relived gene repression and rescued neuron death. Our findings uncover an essential role for EBP1 in embryonic development and implicate its function in transcriptional regulation.
Collapse
|
7
|
Koach J, Holien JK, Massudi H, Carter DR, Ciampa OC, Herath M, Lim T, Seneviratne JA, Milazzo G, Murray JE, McCarroll JA, Liu B, Mayoh C, Keenan B, Stevenson BW, Gorman MA, Bell JL, Doughty L, Hüttelmaier S, Oberthuer A, Fischer M, Gifford AJ, Liu T, Zhang X, Zhu S, Gustafson WC, Haber M, Norris MD, Fletcher JI, Perini G, Parker MW, Cheung BB, Marshall GM. Drugging MYCN Oncogenic Signaling through the MYCN-PA2G4 Binding Interface. Cancer Res 2019; 79:5652-5667. [PMID: 31501192 DOI: 10.1158/0008-5472.can-19-1112] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 07/17/2019] [Accepted: 09/03/2019] [Indexed: 11/16/2022]
Abstract
MYCN is a major driver for the childhood cancer, neuroblastoma, however, there are no inhibitors of this target. Enhanced MYCN protein stability is a key component of MYCN oncogenesis and is maintained by multiple feedforward expression loops involving MYCN transactivation target genes. Here, we reveal the oncogenic role of a novel MYCN target and binding protein, proliferation-associated 2AG4 (PA2G4). Chromatin immunoprecipitation studies demonstrated that MYCN occupies the PA2G4 gene promoter, stimulating transcription. Direct binding of PA2G4 to MYCN protein blocked proteolysis of MYCN and enhanced colony formation in a MYCN-dependent manner. Using molecular modeling, surface plasmon resonance, and mutagenesis studies, we mapped the MYCN-PA2G4 interaction site to a 14 amino acid MYCN sequence and a surface crevice of PA2G4. Competitive chemical inhibition of the MYCN-PA2G4 protein-protein interface had potent inhibitory effects on neuroblastoma tumorigenesis in vivo. Treated tumors showed reduced levels of both MYCN and PA2G4. Our findings demonstrate a critical role for PA2G4 as a cofactor in MYCN-driven neuroblastoma and highlight competitive inhibition of the PA2G4-MYCN protein binding as a novel therapeutic strategy in the disease. SIGNIFICANCE: Competitive chemical inhibition of the PA2G4-MYCN protein interface provides a basis for drug design of small molecules targeting MYC and MYCN-binding partners in malignancies driven by MYC family oncoproteins.
Collapse
Affiliation(s)
- Jessica Koach
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia.,Department of Pediatrics, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, California
| | - Jessica K Holien
- ACRF Rational Drug Discovery Centre, St. Vincent's Institute of Medical Research, Fitzroy, Victoria, Australia
| | - Hassina Massudi
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Daniel R Carter
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia.,School of Women's & Children's Health, UNSW Sydney, Randwick New South Wales, Australia.,School of Biomedical Engineering, University of Technology Sydney, Australia
| | - Olivia C Ciampa
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Mika Herath
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Taylor Lim
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Janith A Seneviratne
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Giorgio Milazzo
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | - Jayne E Murray
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Joshua A McCarroll
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia.,Australian Centre for NanoMedicine, ARC Centre for Excellence in Convergent Bio-Nano Science and Technology, UNSW, Australia
| | - Bing Liu
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Chelsea Mayoh
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Bryce Keenan
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Brendan W Stevenson
- ACRF Rational Drug Discovery Centre, St. Vincent's Institute of Medical Research, Fitzroy, Victoria, Australia
| | - Michael A Gorman
- ACRF Rational Drug Discovery Centre, St. Vincent's Institute of Medical Research, Fitzroy, Victoria, Australia.,Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria, Australia
| | - Jessica L Bell
- The Section for Molecular Cell Biology, Institute of Molecular Medicine, Martin Luther University of Halle, Halle, Germany
| | - Larissa Doughty
- ACRF Rational Drug Discovery Centre, St. Vincent's Institute of Medical Research, Fitzroy, Victoria, Australia.,Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria, Australia
| | - Stefan Hüttelmaier
- The Section for Molecular Cell Biology, Institute of Molecular Medicine, Martin Luther University of Halle, Halle, Germany
| | - Andre Oberthuer
- Department of Pediatric Oncology and Hematology, Children's Hospital, University of Cologne, Cologne, Germany.,Department of Neonatology and Pediatric Intensive Care Medicine, Children's Hospital, University of Cologne, Cologne, Germany
| | - Matthias Fischer
- Department of Pediatric Oncology and Hematology, Children's Hospital, University of Cologne, Cologne, Germany.,Max Planck Institute for Metabolism Research, Cologne, Germany
| | - Andrew J Gifford
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia.,Department of Anatomical Pathology, Prince of Wales Hospital, Randwick, New South Wales, Australia
| | - Tao Liu
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Xiaoling Zhang
- Department of Biochemistry and Molecular Biology, Cancer Center and Center for Individualized Medicine, Mayo Clinic, Rochester, Minnesota
| | - Shizhen Zhu
- Department of Biochemistry and Molecular Biology, Cancer Center and Center for Individualized Medicine, Mayo Clinic, Rochester, Minnesota
| | - W Clay Gustafson
- Department of Pediatrics, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, California
| | - Michelle Haber
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Murray D Norris
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Jamie I Fletcher
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Giovanni Perini
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | - Michael W Parker
- ACRF Rational Drug Discovery Centre, St. Vincent's Institute of Medical Research, Fitzroy, Victoria, Australia.,Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria, Australia
| | - Belamy B Cheung
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia. .,School of Women's & Children's Health, UNSW Sydney, Randwick New South Wales, Australia.,School of Life Sciences and Technology, Tongji University, Shanghai, China
| | - Glenn M Marshall
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia. .,School of Women's & Children's Health, UNSW Sydney, Randwick New South Wales, Australia.,Kids Cancer Centre, Sydney Children's Hospital, Randwick, New South Wales, Australia
| |
Collapse
|
8
|
Wu JY, Shih YL, Lin SP, Hsieh TY, Lin YW. YC-1 Antagonizes Wnt/β-Catenin Signaling Through the EBP1 p42 Isoform in Hepatocellular Carcinoma. Cancers (Basel) 2019; 11:cancers11050661. [PMID: 31086087 PMCID: PMC6562864 DOI: 10.3390/cancers11050661] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 05/03/2019] [Accepted: 05/07/2019] [Indexed: 01/03/2023] Open
Abstract
Novel drugs targeting Wnt signaling are gradually being developed for hepatocellular carcinoma (HCC) treatment. In this study, we used a Wnt-responsive Super-TOPflash (STF) luciferase reporter assay to screen a new compound targeting Wnt signaling. 3-(5'-Hydroxymethyl-2'-furyl)-1-benzylindazole (YC-1) was identified as a small molecule inhibitor of the Wnt/β-catenin pathway. Our coimmunoprecipitation (co-IP) data showed that YC-1 did not affect the β-catenin/TCF interaction. Then, by mass spectrometry, we identified the ErbB3 receptor-binding protein 1 (EBP1) interaction with the β-catenin/TCF complex upon YC-1 treatment. EBP1 encodes two splice isoforms, p42 and p48. We further demonstrated that YC-1 enhances p42 isoform binding to the β-catenin/TCF complex and reduces the transcriptional activity of the complex. The suppression of colony formation by YC-1 was significantly reversed after knockdown of both isoforms (p48 and p42); however, the inhibition of colony formation was maintained when only EBP1 p48 was silenced. Taken together, these results suggest that YC-1 treatment results in a reduction in Wnt-regulated transcription through EBP1 p42 and leads to the inhibition of tumor cell proliferation. These data imply that YC-1 is a drug that antagonizes Wnt/β-catenin signaling in HCC.
Collapse
Affiliation(s)
- Ju-Yun Wu
- Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei 11490, Taiwan.
| | - Yu-Lueng Shih
- Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei 11490, Taiwan.
- Division of Gastroenterology, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei 11490, Taiwan.
| | - Shih-Ping Lin
- Department and Graduate Institute of Microbiology and Immunology, National Defense Medical Center, Taipei 11490, Taiwan.
| | - Tsai-Yuan Hsieh
- Division of Gastroenterology, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei 11490, Taiwan.
| | - Ya-Wen Lin
- Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei 11490, Taiwan.
- Department and Graduate Institute of Microbiology and Immunology, National Defense Medical Center, Taipei 11490, Taiwan.
- Graduate Institute of Life Sciences, National Defense Medical Center, Taipei 11490, Taiwan.
| |
Collapse
|
9
|
Nguyen DQ, Hoang DH, Nguyen Vo TT, Huynh V, Ghoda L, Marcucci G, Nguyen LXT. The role of ErbB3 binding protein 1 in cancer: Friend or foe? J Cell Physiol 2018; 233:9110-9120. [PMID: 30076717 DOI: 10.1002/jcp.26951] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 06/12/2018] [Indexed: 12/20/2022]
Abstract
ErbB3, a member of the epidermal growth factor receptor family, reportedly plays an essential role in the regulation of cancer progression and therapeutic resistance. Numerous studies have indicated that ErbB3 binding protein 1 (Ebp1), a binding partner for ErbB3, plays an important regulatory role in the expression and function of ErbB3, but there is no agreement as to whether Ebp1 also has an ErbB3-independent function in cancer and how it might contribute to tumorigenesis. In this review, we will discuss the different functions of the two Ebp1 isoforms, p48 and p42, that may be responsible for the potentially dual role of Ebp1 in cancer growth.
Collapse
Affiliation(s)
- Dang Quan Nguyen
- Department of Medical Biotechnology, Biotechnology Center of Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Dinh Hoa Hoang
- Gehr Family Center for Leukemia Research, Hematology Malignancies and Stem Cell Transplantation Institute, City of Hope Medical Center, Duarte, California
| | - Thanh Thao Nguyen Vo
- Department of Medical Biotechnology, Biotechnology Center of Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Vu Huynh
- Department of Medical Biotechnology, Biotechnology Center of Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Lucy Ghoda
- Gehr Family Center for Leukemia Research, Hematology Malignancies and Stem Cell Transplantation Institute, City of Hope Medical Center, Duarte, California
| | - Guido Marcucci
- Gehr Family Center for Leukemia Research, Hematology Malignancies and Stem Cell Transplantation Institute, City of Hope Medical Center, Duarte, California
| | - Le Xuan Truong Nguyen
- Department of Medical Biotechnology, Biotechnology Center of Ho Chi Minh City, Ho Chi Minh City, Vietnam.,Gehr Family Center for Leukemia Research, Hematology Malignancies and Stem Cell Transplantation Institute, City of Hope Medical Center, Duarte, California
| |
Collapse
|
10
|
Somanath P, Bush KM, Knoepfler PS. ERBB3-Binding Protein 1 (EBP1) Is a Novel Developmental Pluripotency-Associated-4 (DPPA4) Cofactor in Human Pluripotent Cells. Stem Cells 2018; 36:671-682. [PMID: 29327467 DOI: 10.1002/stem.2776] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 12/04/2017] [Accepted: 12/09/2017] [Indexed: 12/31/2022]
Abstract
Developmental Pluripotency-Associated-4 (DPPA4) is one of the few core pluripotency genes lacking clearly defined molecular and cellular functions. Here, we used a proteomics screening approach of human embryonic stem cell (hESC) nuclear extract to determine DPPA4 molecular functions through identification of novel cofactors. Unexpectedly, the signaling molecule ERBB3-binding protein 1 (EBP1) was the strongest candidate binding partner for DPPA4 in hESC. EBP1 is a growth factor signaling mediator present in two isoforms, p48 and p42. The two isoforms generally have opposing functions, however their roles in pluripotent cells have not been established. We found that DPPA4 preferentially binds p48 in pluripotent and NTERA-2 cells, but this interaction is largely absent in non-pluripotent cells and is reduced with differentiation. The DPPA4-EBP1 interaction is mediated at least in part in DPPA4 by the highly conserved SAF-A/B, Acinus and PIAS (SAP) domain. Functionally, we found that DPPA4 transcriptional repressive function in reporter assays is significantly increased by specific p48 knockdown, an effect that was abolished with an interaction-deficient DPPA4 ΔSAP mutant. Thus, DPPA4 and EBP1 may cooperate in transcriptional functions through their physical association in a pluripotent cell specific context. Our study identifies EBP1 as a novel pluripotency cofactor and provides insight into potential mechanisms used by DPPA4 in regulating pluripotency through its association with EBP1. Stem Cells 2018;36:671-682.
Collapse
Affiliation(s)
- Priyanka Somanath
- Department of Cell Biology and Human Anatomy, University of California, Davis, Davis, California, USA.,Institute of Pediatric Regenerative Medicine, Shriners Hospital for Children Northern California, Sacramento, California, USA
| | - Kelly M Bush
- Department of Cell Biology and Human Anatomy, University of California, Davis, Davis, California, USA.,Institute of Pediatric Regenerative Medicine, Shriners Hospital for Children Northern California, Sacramento, California, USA
| | - Paul S Knoepfler
- Department of Cell Biology and Human Anatomy, University of California, Davis, Davis, California, USA.,Institute of Pediatric Regenerative Medicine, Shriners Hospital for Children Northern California, Sacramento, California, USA
| |
Collapse
|
11
|
Abstract
A new 28-norlupane triterpenoid, 3-acetate-28-norlup-20(29)-en-3β-hydroxy-17β-hydroperoxide (1) and a new tirucallane triterpenoid, cornusalterin M (2), together with one known triterpenoid, 3-acetate-28-norlup-20(29)-en-3β,17β-diol (3), were isolated from a MeOH extract of the stems of Cornus walteri. The chemical structures of the new compounds (1 and 2) were elucidated based on comprehensive one- and two-dimensional (1D and 2D) NMR spectroscopic experiments and high resolution-electrospray ionization (HR-ESI)-MS. Among the isolates, compound 1 was a relatively rare triterpenoid identified as a 28-norlupane-type triterpene with a 17β-hydroperoxide group and compound 3 was previously reported but only as a synthetic product. The cytotoxic activities of the isolated compounds 1-3 were evaluated by determining their inhibitory effects on human tumor cell lines (A549 (non-small cell lung carcinoma), SK-OV-3 (ovary malignant ascites), SK-MEL-2 (skin melanoma), and HCT-15 (colon adenocarcinoma)).
Collapse
|
12
|
Yu JS, Moon E, Kim KH. A new cerebroside from the twigs of Lindera glauca (Sieb. et Zucc.) Blume. Bioorg Chem 2017; 74:122-125. [PMID: 28778013 DOI: 10.1016/j.bioorg.2017.07.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 07/18/2017] [Indexed: 11/30/2022]
Abstract
Lindera glauca (Sieb. et Zucc.) Blume (Lauraceae) has been used to treat rheumatic arthritis, stroke, and cardiac pain. Phytochemical investigation of twigs of L. glauca (Sieb. et Zucc.) Blume resulted in the isolation and identification of a new cerebroside, glaucerebroside (1). The structure of 1 was elucidated by a combination of extensive spectroscopic analyses, including extensive 2D NMR, HR-MS, chemical reactions, and LC/MS analysis. Compound 1 is a relatively rare cerebroside with l-threo-configuration of the sphingosine part. This is the second example of identification of a cerebroside from the family Lauraceae. Compound 1 significantly inhibited nitric oxide (NO) production in lipopolysaccharide (LPS)-stimulated BV-2 cells, with an IC50 value of 23.84μM without inducing cell toxicity. This study suggests that glaucerebroside (1) can be an excellent candidate for development of novel anti-neuroinflammatory agents.
Collapse
Affiliation(s)
- Jae Sik Yu
- School of Pharmacy, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Eunjung Moon
- Charmzone R&D Center, Charmzone Co. LTD., 318 Yeongdong-daero, Gangnam-gu, Seoul 06177, Republic of Korea
| | - Ki Hyun Kim
- School of Pharmacy, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
| |
Collapse
|
13
|
Yu M, Wang H, Liu Z, Lu Y, Yu D, Li D, Du W. Ebp1 regulates myogenic differentiation of myoblast cells via SMAD2/3 signaling pathway. Dev Growth Differ 2017; 59:540-551. [PMID: 28707296 DOI: 10.1111/dgd.12380] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 06/01/2017] [Accepted: 06/02/2017] [Indexed: 12/25/2022]
Abstract
Regulation of skeletal muscle development requires many of the regulatory networks that are fundamental to developmental myogenesis. ErbB3 binding protein-1 (Ebp1) is involved in the control of myoblasts development in chicken. However, the expression and biological functions of Ebp1 in the progress of myogenesis are unclear. This study focused on determining the effect of Ebp1 on myogenic proliferation and differentiation using a primary myoblasts culture model. Ebp1 was found to upregulate in proliferating myoblasts and decrease at the early stage of myogenic differentiation. The level of endogenous Ebp1 increased from E9 to E20 chicken leg muscles. Knockdown of Ebp1 had no effect on myoblasts proliferation. However, myogenic differentiation into multinucleated myotubes was significantly reduced. The mRNA and protein expression of MRFs was decreased when Ebp1 was knocked down. Downregulation of Ebp1, accompanied by elevated levels of pSMAD2/3, suggests that Ebp1 is involved in regulating myogenic differentiation via SMAD2/3 inhibition. The phosphorylation of SMAD2/3 was activated and the expression of MYOD and MYOG was reduced in Ebp1 knockdown myoblasts, but addition of LY2109761 (an inhibitor specified to SMAD2/3) blocked these effects. Collectively, these results indicate that Ebp1 promotes myoblast differentiation by inhibition of SMAD2/3 signaling pathway during chicken myogenesis. These data provide new insights into the biological role of Ebp1 in embryonic chicken skeletal muscle development.
Collapse
Affiliation(s)
- Minli Yu
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Huan Wang
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Zhen Liu
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Yinglin Lu
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Debing Yu
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Dongfeng Li
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Wenxing Du
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| |
Collapse
|
14
|
Eom HJ, Kang HR, Choi SU, Kim KH. Cytotoxic Triterpenoids from the Barks of Betula platyphylla var. japonica. Chem Biodivers 2017; 14. [PMID: 28052515 DOI: 10.1002/cbdv.201600400] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 01/03/2017] [Indexed: 11/10/2022]
Abstract
Phytochemical investigation on the barks of Betula platyphylla var. japonica (Betulaceae) was carried out, resulting in the isolation and identification of three new triterpenoids, 27-O-cis-caffeoylcylicodiscic acid (1), 27-O-cis-feruloylcylicodiscic acid (2), and 27-O-cis-caffeoylmyricerol (3), along with six known triterpenoids, obtusilinin (4), winchic acid (5), 27-O-trans-caffeoylcylicodiscic acid (6), uncarinic acid E (7), myriceric acid B (8), and 3-O-trans-caffeoyloleanolic acid (9). The structures of the new compounds were elucidated by extensive spectroscopic methods, including 1D- and 2D-NMR, and HR-ESI-MS. All of the isolated compounds were evaluated for cytotoxicity against four human tumor cell lines (A549, SK-OV-3, SK-MEL-2, and Bt549). Compounds 2, 6, 8, and 9 exhibited potent cytotoxicity against all of the tumor cells tested (IC50 < 10.0 μm), while compounds 3, 4, 5, and 7 showed moderate cytotoxicity against all of the tumor cells tested (IC50 < 20.0 μm).
Collapse
Affiliation(s)
- Hee Jeong Eom
- School of Pharmacy, Sungkyunkwan University, Suwon, 440-746, Korea
| | - Hee Rae Kang
- School of Pharmacy, Sungkyunkwan University, Suwon, 440-746, Korea
| | - Sang Un Choi
- Korea Research Institute of Chemical Technology, Deajeon, 305-600, Korea
| | - Ki Hyun Kim
- School of Pharmacy, Sungkyunkwan University, Suwon, 440-746, Korea
| |
Collapse
|
15
|
Wang Y, Zhang P, Wang Y, Zhan P, Liu C, Mao JH, Wei G. Distinct Interactions of EBP1 Isoforms with FBXW7 Elicits Different Functions in Cancer. Cancer Res 2017; 77:1983-1996. [PMID: 28209614 DOI: 10.1158/0008-5472.can-16-2246] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2016] [Revised: 01/09/2017] [Accepted: 01/25/2017] [Indexed: 01/07/2023]
Abstract
The ErbB3 receptor-binding protein EBP1 encodes two alternatively spliced isoforms P48 and P42. While there is evidence of differential roles for these isoforms in tumorigenesis, little is known about their underlying mechanisms. Here, we demonstrate that EBP1 isoforms interact with the SCF-type ubiquitin ligase FBXW7 in distinct ways to exert opposing roles in tumorigenesis. EBP1 P48 bound to the WD domain of FBXW7 as an oncogenic substrate of FBXW7. EBP1 P48 binding sequestered FBXW7α to the cytosol, modulating its role in protein degradation and attenuating its tumor suppressor function. In contrast, EBP1 P42 bound to both the F-box domain of FBXW7 as well as FBXW7 substrates. This adapter function of EBP1 P42 stabilized the interaction of FBXW7 with its substrates and promoted FBXW7-mediated degradation of oncogenic targets, enhancing its overall tumor-suppressing function. Overall, our results establish distinct physical and functional interactions between FBXW7 and EBP1 isoforms, which yield their mechanistically unique isoform-specific functions of EBP1 in cancer. Cancer Res; 77(8); 1983-96. ©2017 AACR.
Collapse
Affiliation(s)
- Yuli Wang
- Department of Human Anatomy and Key Laboratory of Experimental Teratology, Ministry of Education, Shandong University School of Medicine, Shandong, PR China
| | - Pengju Zhang
- Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Shandong, PR China
| | - Yunshan Wang
- Department of Human Anatomy and Key Laboratory of Experimental Teratology, Ministry of Education, Shandong University School of Medicine, Shandong, PR China.,Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California
| | - Panpan Zhan
- Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Shandong, PR China
| | - Chunyan Liu
- Department of Biochemistry and Molecular Biology, Shandong University School of Medicine, Shandong, PR China
| | - Jian-Hua Mao
- Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California.
| | - Guangwei Wei
- Department of Human Anatomy and Key Laboratory of Experimental Teratology, Ministry of Education, Shandong University School of Medicine, Shandong, PR China.
| |
Collapse
|
16
|
C-terminal domain of p42 Ebp1 is essential for down regulation of p85 subunit of PI3K, inhibiting tumor growth. Sci Rep 2016; 6:30626. [PMID: 27464702 PMCID: PMC4964336 DOI: 10.1038/srep30626] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 07/06/2016] [Indexed: 02/06/2023] Open
Abstract
Potential tumor suppressor p42, ErbB3-binding protein 1 (EBP1) inhibits phosphoinositide 3-kinase (PI3K) activity reducing the p85 regulatory subunit. In this study, we demonstrated that overexpression of p42 promoted not only a reduction of wild type of p85 subunit but also oncogenic mutant forms of p85 which were identified in human cancers. Moreover, we identified the small fragment of C-terminal domain of p42 is sufficient to exhibit tumor suppressing activity of p42-WT, revealing that this small fragment (280-394) of p42 is required for the binding of both HSP70 and CHIP for a degradation of p85. Furthermore, we showed the small fragment of p42 markedly inhibited the tumor growth in mouse xenograft models of brain and breast cancer, resembling tumor suppressing activity of p42. Through identification of the smallest fragment of p42 that is responsible for its tumor suppressor activity, our findings represent a novel approach for targeted therapy of cancers that overexpress PI3K.
Collapse
|
17
|
Ko HR, Chang YS, Park WS, Ahn JY. Opposing roles of the two isoforms of ErbB3 binding protein 1 in human cancer cells. Int J Cancer 2016; 139:1202-8. [DOI: 10.1002/ijc.30165] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 04/25/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Hyo Rim Ko
- Department of Molecular Cell Biology; Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine; Suwon Korea
| | - Yun Sil Chang
- Department of Pediatrics; Samsung Medical Center, Sungkyunkwan University School of Medicine; Seoul Korea
| | - Won Soon Park
- Department of Pediatrics; Samsung Medical Center, Sungkyunkwan University School of Medicine; Seoul Korea
| | - Jee-Yin Ahn
- Department of Molecular Cell Biology; Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine; Suwon Korea
| |
Collapse
|
18
|
Nguyen LXT, Zhu L, Lee Y, Ta L, Mitchell BS. Expression and Role of the ErbB3-Binding Protein 1 in Acute Myelogenous Leukemic Cells. Clin Cancer Res 2016; 22:3320-7. [PMID: 26813358 DOI: 10.1158/1078-0432.ccr-15-2282] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Accepted: 12/21/2015] [Indexed: 11/16/2022]
Abstract
PURPOSE The ErbB3-binding protein 1 (Ebp1) has been implicated in diverse cancers as having either oncogenic or tumor suppressor activities. The present study was undertaken to determine the effects of Ebp1 expression in AML cells and to determine the mechanisms by which Ebp1 promotes cell proliferation in these cells. EXPERIMENTAL DESIGN The expression of Ebp1 was studied in mononuclear cells obtained from the peripheral blood of 54 patients with AML by Western blot analysis. The effects of Ebp1 expression on proliferating cell nuclear antigen (PCNA) expression and cell proliferation was measured using Western blot analysis, immunoprecipitation, in vitro ubiquitination, and colony-forming assays. The role of Ebp1 in promoting rRNA synthesis and cell proliferation was evaluated by measuring the level of pre-rRNA and the recruitment of Pol I to rDNA. RESULTS Ebp1 is highly expressed in acute myelogenous leukemia (AML) cells and regulates the level of ribosomal RNA (rRNA) synthesis by binding to RNA Polymerase I (Pol I) and enhancing the formation of the Pol I initiation complex. Ebp1 also increases the stability of PCNA protein by preventing its interaction with Mdm2, for which it is a substrate. CONCLUSIONS These results demonstrate an important role of Ebp1 in promoting cell proliferation in AML cells through the regulation of both rRNA synthesis and PCNA expression. Clin Cancer Res; 22(13); 3320-7. ©2016 AACR.
Collapse
Affiliation(s)
- Le Xuan Truong Nguyen
- Departments of Medicine and Chemical and Systems Biology, Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California
| | - Li Zhu
- Departments of Medicine and Chemical and Systems Biology, Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California
| | - Yunqin Lee
- Departments of Medicine and Chemical and Systems Biology, Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California
| | - Lynn Ta
- Departments of Medicine and Chemical and Systems Biology, Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California
| | - Beverly S Mitchell
- Departments of Medicine and Chemical and Systems Biology, Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California.
| |
Collapse
|
19
|
High expression of ErbB3 binding protein 1 (EBP1) predicts poor prognosis of pancreatic ductal adenocarcinoma (PDAC). Tumour Biol 2015; 36:9189-99. [PMID: 26088450 DOI: 10.1007/s13277-015-3625-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 05/27/2015] [Indexed: 02/04/2023] Open
Abstract
Recent studies have identified that ErbB3 binding protein 1 (EBP1) is broadly expressed in various cancer tissues and critically involved in plenty of biological processes in this regard. However, the functional role of EBP1 in pancreatic ductal adenocarcinoma (PDAC) has never been elucidated. In this study, we found that EBP1 could serve as a prognostic biomarker of PDAC. Western blot analysis revealed that EBP1 was remarkably upregulated in PDAC tissues and cell lines. Using immunohistochemical analysis, we showed that the expression of EBP1 was correlated with tumor size (P = 0.004), histological differentiation (P = 0.041), and tumor node metastasis (TNM) stage (P = 0.000). Notably, Kaplan-Meier curve showed that high expression of EBP1 predicted significantly worsened prognosis of PDAC patients (P = 0.001). In addition, knockdown of EBP1 expression suppressed PDAC cell proliferation and retarded cell cycle progression. Furthermore, depletion of EBP1 induced the apoptosis of Panc-1 cells. Of great interest, we found that EBP1 interacted with anti-apoptotic protein, Bcl-xL, and promoted its accumulation. In summary, our results suggest that EBP1 is a novel prognostic indicator and potential therapeutic target of PDAC, shedding new insights into the important role of EBP1 in cancer development.
Collapse
|