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Jing LP, Li M, Xia XY, Zheng X, Chen JY, He J, Zhuang XW. SIAH2 is specifically expressed during cervical carcinogenesis, and closely relates to the abnormal proliferation of cervical epithelial cells. Heliyon 2024; 10:e31487. [PMID: 38828323 PMCID: PMC11140618 DOI: 10.1016/j.heliyon.2024.e31487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 05/16/2024] [Accepted: 05/16/2024] [Indexed: 06/05/2024] Open
Abstract
Background Cervical cancer is one of the most common malignancies in women worldwide. As a RING type ubiquitin ligase, SIAH2 has been reported to promote the progression of a variety of tumors by interacting with and targeting multiple chaperones and substrates. The aim of this study was to further identify the role and the related molecular mechanisms involved of SIAH2 in cervical carcinogenesis. Methods and results Cellular assays in vitro showed that knockdown of SIAH2 inhibited the proliferation, migration and invasion of human cervical cancer cells C33A and SiHa, induced apoptosis, and increased the sensitivity to cisplatin treatment. Knockdown of SIAH2 also inhibited the epithelial-mesenchymal transition and activation of the Akt/mTOR signaling pathway in cervical cancer cells, which were detected by Western blot. Mechanistically, SIAH2, as a ubiquitin ligase, induced the ubiquitination degradation of GSK3β degradation by using coIP. The results of complementation experiments further demonstrated that GSK3β overexpression rescued the increase of cell proliferation and invasion caused by SIAH2 overexpression. Specific expression of SIAH2 appeared in precancerous and cervical cancer tissues compared to inflammatory cervical lesions tissues using immunohistochemical staining. The more SIAH2 was expressed as the degree of cancer progressed. SIAH2 was significantly highly expressed in cervical cancer tissues (44/55, 80 %) compared with precancerous tissues (18/69, 26.1 %). Moreover, the expression level of SIAH2 in cervical cancer tissues was significantly correlated with the degree of cancer differentiation, and cervical cancer tissues with higher SIAH2 expression levels were less differentiated. Conclusion Targeting SIAH2 may be beneficial to the treatment of cervical cancer.
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Affiliation(s)
- Li-ping Jing
- Clinical Laboratory Department, Liaoning Cancer Hospital & Institute, 110042, Shenyang, Liaoning, China
| | - Meng Li
- Department of Laboratory, Shandong Provincial Third Hospital, Shandong University, 250031, Jinan, Shandong, China
| | - Xi-yan Xia
- Department of Immunology Teaching and Research, Jinan Vocational College of Nursing, 250102, Jinan, Shandong, China
| | - Xin Zheng
- Department of Laboratory, Shandong Provincial Third Hospital, Shandong University, 250031, Jinan, Shandong, China
| | - Jia-yu Chen
- Department of Laboratory, Shandong Provincial Third Hospital, Shandong University, 250031, Jinan, Shandong, China
| | - Jing He
- Second Clinical Medical College, Shandong University of Traditional Chinese Medicine, 250014, Jinan, Shandong, China
| | - Xue-wei Zhuang
- Department of Laboratory, Shandong Provincial Third Hospital, Shandong University, 250031, Jinan, Shandong, China
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2
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Nurminen R, Afyounian E, Paunu N, Katainen R, Isomäki M, Nurminen A, Scaravilli M, Tolppanen J, Fey V, Kivinen A, Helén P, Välimäki N, Kesseli J, Aaltonen LA, Haapasalo H, Nykter M, Rautajoki KJ. Previously reported CCDC26 risk variant and novel germline variants in GALNT13, AR, and MYO10 associated with familial glioma in Finland. Sci Rep 2024; 14:11562. [PMID: 38773237 PMCID: PMC11109329 DOI: 10.1038/s41598-024-62296-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Accepted: 05/15/2024] [Indexed: 05/23/2024] Open
Abstract
Predisposing factors underlying familial aggregation of non-syndromic gliomas are still to be uncovered. Whole-exome sequencing was performed in four Finnish families with brain tumors to identify rare predisposing variants. A total of 417 detected exome variants and 102 previously reported glioma-related variants were further genotyped in 19 Finnish families with brain tumors using targeted sequencing. Rare damaging variants in GALNT13, MYO10 and AR were identified. Two families carried either c.553C>T (R185C) or c.1214T>A (L405Q) on GALNT13. Variant c.553C>T is located on the substrate-binding site of GALNT13. AR c.2180G>T (R727L), which is located on a ligand-binding domain of AR, was detected in two families, one of which also carried a GALNT13 variant. MYO10 c.4448A>G (N1483S) was detected in two families and c.1511C>T (A504V) variant was detected in one family. Both variants are located on functional domains related to MYO10 activity in filopodia formation. In addition, affected cases in six families carried a known glioma risk variant rs55705857 in CCDC26 and low-risk glioma variants. These novel findings indicate polygenic inheritance of familial glioma in Finland and increase our understanding of the genetic contribution to familial glioma susceptibility.
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Affiliation(s)
- Riikka Nurminen
- Prostate Cancer Research Center, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön katu 34, 33520, Tampere, Finland
- Tays Cancer Center, Tampere University Hospital, Tampere, Finland
| | - Ebrahim Afyounian
- Prostate Cancer Research Center, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön katu 34, 33520, Tampere, Finland
- Tays Cancer Center, Tampere University Hospital, Tampere, Finland
| | - Niina Paunu
- Department of Oncology, Tampere University Hospital, Tampere, Finland
| | - Riku Katainen
- Applied Tumor Genomics Research Program, Department of Medical and Clinical Genetics, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Mari Isomäki
- Prostate Cancer Research Center, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön katu 34, 33520, Tampere, Finland
- Tays Cancer Center, Tampere University Hospital, Tampere, Finland
| | - Anssi Nurminen
- Prostate Cancer Research Center, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön katu 34, 33520, Tampere, Finland
- Tays Cancer Center, Tampere University Hospital, Tampere, Finland
| | - Mauro Scaravilli
- Prostate Cancer Research Center, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön katu 34, 33520, Tampere, Finland
- Tays Cancer Center, Tampere University Hospital, Tampere, Finland
| | - Jenni Tolppanen
- Prostate Cancer Research Center, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön katu 34, 33520, Tampere, Finland
- Tays Cancer Center, Tampere University Hospital, Tampere, Finland
| | - Vidal Fey
- Prostate Cancer Research Center, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön katu 34, 33520, Tampere, Finland
- Tays Cancer Center, Tampere University Hospital, Tampere, Finland
| | - Anni Kivinen
- Prostate Cancer Research Center, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön katu 34, 33520, Tampere, Finland
- Tays Cancer Center, Tampere University Hospital, Tampere, Finland
| | - Pauli Helén
- Prostate Cancer Research Center, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön katu 34, 33520, Tampere, Finland
- Tays Cancer Center, Tampere University Hospital, Tampere, Finland
| | - Niko Välimäki
- Applied Tumor Genomics Research Program, Department of Medical and Clinical Genetics, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Juha Kesseli
- Prostate Cancer Research Center, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön katu 34, 33520, Tampere, Finland
- Tays Cancer Center, Tampere University Hospital, Tampere, Finland
| | - Lauri A Aaltonen
- Applied Tumor Genomics Research Program, Department of Medical and Clinical Genetics, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Hannu Haapasalo
- Prostate Cancer Research Center, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön katu 34, 33520, Tampere, Finland
- Tays Cancer Center, Tampere University Hospital, Tampere, Finland
- Fimlab Laboratories ltd., Tampere University Hospital, Tampere, Finland
| | - Matti Nykter
- Prostate Cancer Research Center, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön katu 34, 33520, Tampere, Finland.
- Tays Cancer Center, Tampere University Hospital, Tampere, Finland.
- Foundation for the Finnish Cancer Institute, Tukholmankatu 8, Helsinki, Finland.
| | - Kirsi J Rautajoki
- Prostate Cancer Research Center, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön katu 34, 33520, Tampere, Finland.
- Tays Cancer Center, Tampere University Hospital, Tampere, Finland.
- Tampere Institute for Advanced Study, Tampere University, Tampere, Finland.
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3
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Kasturirangan S, Nancarrow DJ, Shah A, Lagisetty KH, Lawrence TS, Beer DG, Ray D. Isoform alterations in the ubiquitination machinery impacting gastrointestinal malignancies. Cell Death Dis 2024; 15:194. [PMID: 38453895 PMCID: PMC10920915 DOI: 10.1038/s41419-024-06575-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 02/19/2024] [Accepted: 02/23/2024] [Indexed: 03/09/2024]
Abstract
The advancement of RNAseq and isoform-specific expression platforms has led to the understanding that isoform changes can alter molecular signaling to promote tumorigenesis. An active area in cancer research is uncovering the roles of ubiquitination on spliceosome assembly contributing to transcript diversity and expression of alternative isoforms. However, the effects of isoform changes on functionality of ubiquitination machineries (E1, E2, E3, E4, and deubiquitinating (DUB) enzymes) influencing onco- and tumor suppressor protein stabilities is currently understudied. Characterizing these changes could be instrumental in improving cancer outcomes via the identification of novel biomarkers and targetable signaling pathways. In this review, we focus on highlighting reported examples of direct, protein-coded isoform variation of ubiquitination enzymes influencing cancer development and progression in gastrointestinal (GI) malignancies. We have used a semi-automated system for identifying relevant literature and applied established systems for isoform categorization and functional classification to help structure literature findings. The results are a comprehensive snapshot of known isoform changes that are significant to GI cancers, and a framework for readers to use to address isoform variation in their own research. One of the key findings is the potential influence that isoforms of the ubiquitination machinery have on oncoprotein stability.
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Affiliation(s)
| | - Derek J Nancarrow
- Surgery - Section of Thoracic Surgery, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Ayush Shah
- Departments of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA
- Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA
| | - Kiran H Lagisetty
- Surgery - Section of Thoracic Surgery, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Theodore S Lawrence
- Departments of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - David G Beer
- Surgery - Section of Thoracic Surgery, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Dipankar Ray
- Departments of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA.
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4
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Zhang Q, Chen Y, Wang Q, Wang Y, Feng W, Chai L, Liu J, Li D, Chen H, Qiu Y, Shen N, Shi X, Xie X, Li M. HMGB1-induced activation of ER stress contributes to pulmonary artery hypertension in vitro and in vivo. Respir Res 2023; 24:149. [PMID: 37268944 DOI: 10.1186/s12931-023-02454-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 05/18/2023] [Indexed: 06/04/2023] Open
Abstract
BACKGROUND HMGB1 and ER stress have been considered to participate in the progression of pulmonary artery hypertension (PAH). However, the molecular mechanism underlying HMGB1 and ER stress in PAH remains unclear. This study aims to explore whether HMGB1 induces pulmonary artery smooth muscle cells (PASMCs) functions and pulmonary artery remodeling through ER stress activation. METHODS Primary cultured PASMCs and monocrotaline (MCT)-induced PAH rats were applied in this study. Cell proliferation and migration were determined by CCK-8, EdU and transwell assay. Western blotting was conducted to detect the protein levels of protein kinase RNA-like endoplasmic reticulum kinase (PERK), activating transcription factor-4 (ATF4), seven in absentia homolog 2 (SIAH2) and homeodomain interacting protein kinase 2 (HIPK2). Hemodynamic measurements, immunohistochemistry staining, hematoxylin and eosin staining were used to evaluate the development of PAH. The ultrastructure of ER was observed by transmission electron microscopy. RESULTS In primary cultured PASMCs, HMGB1 reduced HIPK2 expression through upregulation of ER stress-related proteins (PERK and ATF4) and subsequently increased SIAH2 expression, which ultimately led to PASMC proliferation and migration. In MCT-induced PAH rats, interfering with HMGB1 by glycyrrhizin, suppression of ER stress by 4-phenylbutyric acid or targeting SIAH2 by vitamin K3 attenuated the development of PAH. Additionally, tetramethylpyrazine (TMP), as a component of traditional Chinese herbal medicine, reversed hemodynamic deterioration and vascular remodeling by targeting PERK/ATF4/SIAH2/HIPK2 axis. CONCLUSIONS The present study provides a novel insight to understand the pathogenesis of PAH and suggests that targeting HMGB1/PERK/ATF4/SIAH2/HIPK2 cascade might have potential therapeutic value for the prevention and treatment of PAH.
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Affiliation(s)
- Qianqian Zhang
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, No. 277, West Yanta Road, Xi'an, 710061, Shaanxi, China
| | - Yuqian Chen
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, No. 277, West Yanta Road, Xi'an, 710061, Shaanxi, China
| | - Qingting Wang
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, No. 277, West Yanta Road, Xi'an, 710061, Shaanxi, China
| | - Yan Wang
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, No. 277, West Yanta Road, Xi'an, 710061, Shaanxi, China
| | - Wei Feng
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, Guangdong, China
| | - Limin Chai
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, No. 277, West Yanta Road, Xi'an, 710061, Shaanxi, China
| | - Jin Liu
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, No. 277, West Yanta Road, Xi'an, 710061, Shaanxi, China
| | - Danyang Li
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, No. 277, West Yanta Road, Xi'an, 710061, Shaanxi, China
| | - Huan Chen
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, No. 277, West Yanta Road, Xi'an, 710061, Shaanxi, China
| | - Yuanjie Qiu
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, No. 277, West Yanta Road, Xi'an, 710061, Shaanxi, China
| | - Nirui Shen
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, No. 277, West Yanta Road, Xi'an, 710061, Shaanxi, China
| | - Xiangyu Shi
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, No. 277, West Yanta Road, Xi'an, 710061, Shaanxi, China
| | - Xinming Xie
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, No. 277, West Yanta Road, Xi'an, 710061, Shaanxi, China
| | - Manxiang Li
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, No. 277, West Yanta Road, Xi'an, 710061, Shaanxi, China.
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5
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Chen L, Liu YP, Tian LF, Li M, Yang S, Wang S, Xu W, Yan XX. Structural Basis of the Interaction between Human Axin2 and SIAH1 in the Wnt/β-Catenin Signaling Pathway. Biomolecules 2023; 13:biom13040647. [PMID: 37189394 DOI: 10.3390/biom13040647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 03/22/2023] [Accepted: 04/03/2023] [Indexed: 04/08/2023] Open
Abstract
The scaffolding protein Axin is an important regulator of the Wnt signaling pathway, and its dysfunction is closely related to carcinogenesis. Axin could affect the assembly and dissociation of the β-catenin destruction complex. It can be regulated by phosphorylation, poly-ADP-ribosylation, and ubiquitination. The E3 ubiquitin ligase SIAH1 participates in the Wnt pathway by targeting various components for degradation. SIAH1 is also implicated in the regulation of Axin2 degradation, but the specific mechanism remains unclear. Here, we verified that the Axin2-GSK3 binding domain (GBD) was sufficient for SIAH1 binding by the GST pull-down assay. Our crystal structure of the Axin2/SIAH1 complex at 2.53 Å resolution reveals that one Axin2 molecule binds to one SIAH1 molecule via its GBD. These interactions critically depend on a highly conserved peptide 361EMTPVEPA368 within the Axin2-GBD, which forms a loop and binds to a deep groove formed by β1, β2, and β3 of SIAH1 by the N-terminal hydrophilic amino acids Arg361 and Thr363 and the C-terminal VxP motif. The novel binding mode indicates a promising drug-binding site for regulating Wnt/β-catenin signaling.
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Affiliation(s)
- Lianqi Chen
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yan-Ping Liu
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Li-Fei Tian
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Mingzhou Li
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shuyu Yang
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Song Wang
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Wenqing Xu
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Xiao-Xue Yan
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
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6
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Hu Y, He Y, Liu W, Yu S, Wei Y, Bai S, Su Y, Xiao B. SIAH2 regulates colorectal cancer tumorigenesis via PI3K/ATK signaling pathway. Tissue Cell 2022; 78:101878. [DOI: 10.1016/j.tice.2022.101878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 07/27/2022] [Accepted: 07/27/2022] [Indexed: 11/29/2022]
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7
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Modulating the Siah2-PHD3-HIF1α axis and/or autophagy potentially retard colon cancer proliferation possibly, due to the damping of colon cancer stem cells. Biomed Pharmacother 2022; 154:113562. [PMID: 35994813 DOI: 10.1016/j.biopha.2022.113562] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 08/11/2022] [Accepted: 08/14/2022] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Hypoxic microenvironment of colon cancer is associated with HIF-1α upregulation. HIF-1α response elements are responsible for autophagy induction that promotes tumor proliferation. Moreover, HIF-1α induces tumor cell proliferation via maintaining cancer stem cells (CSCs) survival. Siah2 is E3 ubiquitin ligase that indirectly stabilizes HIF-1α. We hypothesized that dual inhibition of Siah2 as well as autophagy could be a promising approach that may inhibit CSCs growth. AIM OF THE WORK This study investigated the possible effect of vitamin K3 as a Siah2 inhibitor and hydroxychloroquine as an autophagy inhibitor in colon cancer management. The effect (if any) of these agents on CSCs growth will be also manipulated. METHODS Colon cancer was induced by dimethylhydrazine. MDA and GSH were selected as oxidative stress markers, Expression of HIF-1α, Caspase-3, VEGF, MMP-9, EpCAM, SCF, and CA19.9 were assayed using immunoassay. The Western blot technique was used to assess LC3Ⅰ, CD44, and CD133 whereas RT-PCR was used to investigate PHD3 and CD44 in colon tissues. Additionally, Ki-67 and Siah2 were detected immunohistochemically. RESULTS vitamin K3 and hydroxychloroquine either alone or in combination downregulated the expression of Siah2 and HIF-1α through upregulating PHD3 in colon tissues. This combination significantly downregulated MDA, Ki-67, VEGF, and MMP-9 expression and upregulated the expression of GSH and caspase-3. LC3Ⅰ was also upregulated. Interestingly, these therapeutic options were correlated with down-regulation of the cancer stem cell marker such as CD44 and EpCAM. CONCLUSION Our results suggested that suppression of both Siah2-PHD3-HIF-1α axis and autophagy retard colon cancer proliferation and dampened CSCs.
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8
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Chen L, Gao W, Sha C, Yang M, Lin L, Li T, Wei H, Chen Q, Xing J, Zhang M, Zhao S, Xu W, Li Y, Zhu X. SIAH1-mediated RPS3 ubiquitination contributes to chemosensitivity in epithelial ovarian cancer. Aging (Albany NY) 2022; 14:6202-6226. [PMID: 35951361 PMCID: PMC9417229 DOI: 10.18632/aging.204211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 07/12/2022] [Indexed: 11/25/2022]
Abstract
The E3 ligase SIAH1 is deregulated in human cancers and correlated with poor prognosis, but its contributions to chemoresistance in epithelial ovarian cancer (EOC) are not evident. Herein we found that SIAH1 was decreased in EOC tumour tissues and cell lines and negatively correlated with the RPS3 levels. SIAH1 overexpression suppressed tumour cell growth, colony formation, invasion, metastasis, and cisplatin resistance in vivo and in vitro. SIAH1 promoted RPS3 ubiquitination and degradation using the RING-finger domain, and these steps were required for RPS3 localization to the cytoplasm, which led to subsequent NF-κB inactivation and thereby conferred chemosensitivity. Moreover, ectopic expression of RPS3 or depletion of RPS3 ubiquitination mediated by SIAH1 via the K214R mutant significantly impaired cisplatin-induced tumour suppression in cells stably expressing SIAH1. Together, our findings reveal a tumour suppressor function of SIAH1 and provide evidence showing that the SIAH1-RPS3-NF-κB axis may act as an appealing strategy for tackling treatment resistance in EOC.
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Affiliation(s)
- Lu Chen
- Reproductive Medicine Center, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China.,Department of Central laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Wujiang Gao
- Reproductive Medicine Center, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China.,Department of Central laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Chunli Sha
- Reproductive Medicine Center, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China.,Department of Central laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Meiling Yang
- Obstetrics and Gynecology, The First People's Hospital of Nantong City, Nantong, Jiangsu, China
| | - Li Lin
- Reproductive Medicine Center, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China.,Department of Central laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Taoqiong Li
- Reproductive Medicine Center, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China.,Department of Central laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Hong Wei
- Department of Central laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Qi Chen
- Department of Central laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Jie Xing
- Reproductive Medicine Center, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China.,Department of Central laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Mengxue Zhang
- Reproductive Medicine Center, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China.,Department of Central laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Shijie Zhao
- Department of Central laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Wenlin Xu
- Department of Central laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Yuefeng Li
- Department of Radiology, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Xiaolan Zhu
- Reproductive Medicine Center, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China.,Department of Central laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China.,International Genome Center of Jiangsu University, Zhenjiang, Jiangsu, China
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9
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Basu B, Ghosh MK. Ubiquitination and deubiquitination in the regulation of epithelial-mesenchymal transition in cancer: Shifting gears at the molecular level. BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2022; 1869:119261. [PMID: 35307468 DOI: 10.1016/j.bbamcr.2022.119261] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 03/03/2022] [Accepted: 03/14/2022] [Indexed: 06/14/2023]
Abstract
The process of conversion of non-motile epithelial cells to their motile mesenchymal counterparts is known as epithelial-mesenchymal transition (EMT), which is a fundamental event during embryonic development, tissue repair, and for the maintenance of stemness. However, this crucial process is hijacked in cancer and becomes the means by which cancer cells acquire further malignant properties such as increased invasiveness, acquisition of stem cell-like properties, increased chemoresistance, and immune evasion ability. The switch from epithelial to mesenchymal phenotype is mediated by a wide variety of effector molecules such as transcription factors, epigenetic modifiers, post-transcriptional and post-translational modifiers. Ubiquitination and de-ubiquitination are two post-translational processes that are fundamental to the ubiquitin-proteasome system (UPS) of the cell, and the shift in equilibrium between these two processes during cancer dictates the suppression or activation of different intracellular processes, including EMT. Here, we discuss the complex and dynamic relationship between components of the UPS and EMT in cancer.
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Affiliation(s)
- Bhaskar Basu
- Cancer Biology and Inflammatory Disorder Division, Council of Scientific and Industrial Research-Indian Institute of Chemical Biology (CSIR-IICB), TRUE Campus, CN-6, Sector-V, Salt Lake, Kolkata- 700091 & 4, Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Mrinal K Ghosh
- Cancer Biology and Inflammatory Disorder Division, Council of Scientific and Industrial Research-Indian Institute of Chemical Biology (CSIR-IICB), TRUE Campus, CN-6, Sector-V, Salt Lake, Kolkata- 700091 & 4, Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India.
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10
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Huang F, Feng Y, Peterlin BM, Fujinaga K. P-TEFb is degraded by Siah1/2 in quiescent cells. Nucleic Acids Res 2022; 50:5000-5013. [PMID: 35524561 PMCID: PMC9122529 DOI: 10.1093/nar/gkac291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 04/05/2022] [Accepted: 04/12/2022] [Indexed: 11/12/2022] Open
Abstract
P-TEFb, composed of CycT1 and CDK9, regulates the elongation of transcription by RNA polymerase II. In proliferating cells, it is regulated by 7SK snRNA in the 7SK snRNP complex. In resting cells, P-TEFb is absent, because CycT1 is dephosphorylated, released from CDK9 and rapidly degraded. In this study, we identified the mechanism of this degradation. We mapped the ubiquitination and degradation of free CycT1 to its N-terminal region from positions 1 to 280. This region is ubiquitinated at six lysines, where E3 ligases Siah1 and Siah2 bind and degrade these sequences. Importantly, the inhibition of Siah1/2 rescued the expression of free CycT1 in proliferating as well as resting primary cells. We conclude that Siah1/2 are the E3 ligases that bind and degrade the dissociated CycT1 in resting, terminally differentiated, anergic and/or exhausted cells.
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Affiliation(s)
- Fang Huang
- Departments of Medicine, Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Yongmei Feng
- Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA
| | - B Matija Peterlin
- Departments of Medicine, Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Koh Fujinaga
- Departments of Medicine, Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143, USA
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11
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Dang TN, Tiongco RP, Brown LM, Taylor JL, Lyons JM, Lau FH, Floyd ZE. Expression of the preadipocyte marker ZFP423 is dysregulated between well-differentiated and dedifferentiated liposarcoma. BMC Cancer 2022; 22:300. [PMID: 35313831 PMCID: PMC8939188 DOI: 10.1186/s12885-022-09379-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 03/04/2022] [Indexed: 11/19/2022] Open
Abstract
Background Well-differentiated and dedifferentiated liposarcomas are rare soft tissue tumors originating in adipose tissue that share genetic abnormalities but have significantly different metastatic potential. Dedifferentiated liposarcoma (DDLPS) is highly aggressive and has an overall 5-year survival rate of 30% as compared to 90% for well-differentiated liposarcoma (WDLPS). This discrepancy may be connected to their potential to form adipocytes, where WDLPS is adipogenic but DDLPS is adipogenic-impaired. Normal adipogenesis requires Zinc Finger Protein 423 (ZFP423), a transcriptional coregulator of Perixosome Proliferator Activated Receptor gamma (PPARG2) mRNA expression that defines committed preadipocytes. Expression of ZFP423 in preadipocytes is promoted by Seven-In-Absentia Homolog 2 (SIAH2)-mediated degradation of Zinc Finger Protein 521 (ZFP521). This study investigated the potential role of ZFP423, SIAH2 and ZFP521 in the adipogenic potential of WDLPS and DDLPS. Methods Human WDLPS and DDLPS fresh and paraffin-embedded tissues were used to assess the gene and protein expression of proadipogenic regulators. In parallel, normal adipose tissue stromal cells along with WDLPS and DDLPS cell lines were cultured, genetically modified, and induced to undergo adipogenesis in vitro. Results Impaired adipogenic potential in DDLPS was associated with reduced ZFP423 protein levels in parallel with reduced PPARG2 expression, potentially involving regulation of ZFP521. SIAH2 protein levels did not define a clear distinction related to adipogenesis in these liposarcomas. However, in primary tumor specimens, SIAH2 mRNA was consistently upregulated in DDLPS compared to WDLPS when assayed by fluorescence in situ hybridization or real-time PCR. Conclusions These data provide novel insights into ZFP423 expression in adipogenic regulation between WDLPS and DDLPS adipocytic tumor development. The data also introduces SIAH2 mRNA levels as a possible molecular marker to distinguish between WDLPS and DDLPS. Supplementary Information The online version contains supplementary material available at 10.1186/s12885-022-09379-6.
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Affiliation(s)
- Thanh N Dang
- Pennington Biomedical Research Center, Baton Rouge, Louisiana, 70808, USA
| | - Rafael P Tiongco
- Tulane University School of Medicine, New Orleans, Louisiana, 70118, USA
| | - Loren M Brown
- Department of Surgery, Louisiana State University Health Science Center, New Orleans, Louisiana, 70112, USA
| | - Jessica L Taylor
- Pennington Biomedical Research Center, Baton Rouge, Louisiana, 70808, USA
| | - John M Lyons
- Our Lady of the Lake Medical Center, Baton Rouge, Louisiana, 70808, USA
| | - Frank H Lau
- Department of Surgery, Louisiana State University Health Science Center, New Orleans, Louisiana, 70112, USA.
| | - Z Elizabeth Floyd
- Pennington Biomedical Research Center, Baton Rouge, Louisiana, 70808, USA.
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12
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Zhang H, Wang J, Ge Y, Ye M, Jin X. Siah1 in cancer and nervous system diseases (Review). Oncol Rep 2021; 47:35. [PMID: 34958110 DOI: 10.3892/or.2021.8246] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 09/10/2021] [Indexed: 11/06/2022] Open
Abstract
The dysregulation of the ubiquitin‑proteasome system will result in the abnormal accumulation and dysfunction of proteins, thus leading to severe diseases. Seven in absentia homolog 1 (Siah1), an E3 ubiquitin ligase, has attracted wide attention due to its varied functions in physiological and pathological conditions, and the numerous newly discovered Siah1 substrates. In cancer and nervous system diseases, the functions of Siah1 as a promoter or a suppressor of diseases are related to the change in cellular microenvironment and subcellular localization. At the same time, complex upstream regulations make Siah1 different from other E3 ubiquitin ligases. Understanding the molecular mechanism of Siah1 will help the study of various signaling pathways and benefit the therapeutic strategy of human diseases (e.g., cancer and nervous system diseases). In the present review, the functions and regulations of Siah1 are described. Moreover, novel substrates of Siah1 discovered in recent studies will be highlighted in cancer and nervous system diseases, providing ideas for future research and clinical targeted therapies using Siah1.
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Affiliation(s)
- Hui Zhang
- Department of Oncology, The Affiliated Hospital of School of Medicine, Ningbo University, Ningbo, Zhejiang 315020, P.R. China
| | - Jie Wang
- Department of Oncology, The Affiliated Hospital of School of Medicine, Ningbo University, Ningbo, Zhejiang 315020, P.R. China
| | - Yidong Ge
- Department of Oncology, The Affiliated Hospital of School of Medicine, Ningbo University, Ningbo, Zhejiang 315020, P.R. China
| | - Meng Ye
- Department of Oncology, The Affiliated Hospital of School of Medicine, Ningbo University, Ningbo, Zhejiang 315020, P.R. China
| | - Xiaofeng Jin
- Department of Oncology, The Affiliated Hospital of School of Medicine, Ningbo University, Ningbo, Zhejiang 315020, P.R. China
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13
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Sokolova O, Naumann M. Manifold role of ubiquitin in Helicobacter pylori infection and gastric cancer. Cell Mol Life Sci 2021; 78:4765-4783. [PMID: 33825941 PMCID: PMC8195768 DOI: 10.1007/s00018-021-03816-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 02/22/2021] [Accepted: 03/18/2021] [Indexed: 02/07/2023]
Abstract
Infection with H. pylori induces a strong host cellular response represented by induction of a set of molecular signaling pathways, expression of proinflammatory cytokines and changes in proliferation. Chronic infection and inflammation accompanied by secretory dysfunction can result in the development of gastric metaplasia and gastric cancer. Currently, it has been determined that the regulation of many cellular processes involves ubiquitinylation of molecular effectors. The binding of ubiquitin allows the substrate to undergo a change in function, to interact within multimolecular signaling complexes and/or to be degraded. Dysregulation of the ubiquitinylation machinery contributes to several pathologies, including cancer. It is not understood in detail how H. pylori impacts the ubiquitinylation of host substrate proteins. The aim of this review is to summarize the existing literature in this field, with an emphasis on the role of E3 ubiquitin ligases in host cell homeodynamics, gastric pathophysiology and gastric cancer.
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Affiliation(s)
- Olga Sokolova
- Medical Faculty, Otto Von Guericke University, Institute of Experimental Internal Medicine, 39120 Magdeburg, Germany
| | - Michael Naumann
- Medical Faculty, Otto Von Guericke University, Institute of Experimental Internal Medicine, 39120 Magdeburg, Germany
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14
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Yan T, Zhou D, Shi Y, Cui D, Jiang J, Han B, Xia S, Wang Z, Liu H, Guo W, Jing Y. Targeting ADT-Induced Activation of the E3 Ubiquitin Ligase Siah2 to Delay the Occurrence of Castration-Resistant Prostate Cancer. Front Oncol 2021; 11:637040. [PMID: 33937036 PMCID: PMC8085430 DOI: 10.3389/fonc.2021.637040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 03/26/2021] [Indexed: 01/13/2023] Open
Abstract
Siah2 is an E3 ubiquitin ligase that targets androgen receptor (AR) and plays an important role in the development of castration-resistant prostate cancer (CRPC). However, the regulation of Siah2 in prostate cancer (PCa) is largely unknown. In this study, we used AR-dependent and -independent cells lines to investigate the cellular roles of AR and androgen deprivation therapy (ADT) on Siah2 protein levels and E3 ligase activity using Western blotting and co-immunoprecipitation. We also validated our findings using patient samples taken before and after ADT. Finally, we used xenograft tumor models to test the effects of ADT combined with vitamin K3 (Vit K3) on tumor growth in vivo. Our results showed that AR stabilizes Siah2 protein by attenuating its self-ubiquitination and auto-degradation, likely by blocking its E3 ubiquitin ligase activity. Conversely, ADT decreased Siah2 protein expression but enhanced its E3 ligase activity in PCa cells. Notably, the findings that ADT decreasing Siah2 protein expression were verified in a series of paired PCa samples from the same patient. Additionally, we found that ADT-induced Siah2 activation could be abolished by Vit K3. Strikingly, ADT combined with Vit K3 treatment delayed the occurrence of CRPC and dramatically inhibited the growth of tumor xenografts compared with ADT treatment alone. AR is an inhibitor of Siah2 in PCa, and ADT leads to the continuous activation of Siah2, which may contribute to CRPC. Finally, ADT+Vit K3 may be a potential approach to delay the occurrence of CRPC.
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Affiliation(s)
- Tingmang Yan
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Dapeng Zhou
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Youwei Shi
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Di Cui
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Juntao Jiang
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Bangmin Han
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Shujie Xia
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhou Wang
- Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States.,Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States.,Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States.,UPMC Hillman Cancer Center, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States
| | - Haitao Liu
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Wenhuan Guo
- Pathology Center, Shanghai General Hospital/Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yifeng Jing
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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15
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Xu D, Li C. Regulation of the SIAH2-HIF-1 Axis by Protein Kinases and Its Implication in Cancer Therapy. Front Cell Dev Biol 2021; 9:646687. [PMID: 33842469 PMCID: PMC8027324 DOI: 10.3389/fcell.2021.646687] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Accepted: 03/08/2021] [Indexed: 12/16/2022] Open
Abstract
The cellular response to hypoxia is a key biological process that facilitates adaptation of cells to oxygen deprivation (hypoxia). This process is critical for cancer cells to adapt to the hypoxic tumor microenvironment resulting from rapid tumor growth. Hypoxia-inducible factor 1 (HIF-1) is a transcription factor and a master regulator of the cellular response to hypoxia. The activity of HIF-1 is dictated primarily by its alpha subunit (HIF-1α), whose level and/or activity are largely regulated by an oxygen-dependent and ubiquitin/proteasome-mediated process. Prolyl hydroxylases (PHDs) and the E3 ubiquitin ligase Von Hippel-Lindau factor (VHL) catalyze hydroxylation and subsequent ubiquitin-dependent degradation of HIF-1α by the proteasome. Seven in Absentia Homolog 2 (SIAH2), a RING finger-containing E3 ubiquitin ligase, stabilizes HIF-1α by targeting PHDs for ubiquitin-mediated degradation by the proteasome. This SIAH2-HIF-1 signaling axis is important for maintaining the level of HIF-1α under both normoxic and hypoxic conditions. A number of protein kinases have been shown to phosphorylate SIAH2, thereby regulating its stability, activity, or substrate binding. In this review, we will discuss the regulation of the SIAH2-HIF-1 axis via phosphorylation of SIAH2 by these kinases and the potential implication of this regulation in cancer biology and cancer therapy.
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Affiliation(s)
- Dazhong Xu
- Department of Pathology, Microbiology and Immunology, School of Medicine, New York Medical College, Valhalla, NY, United States
| | - Cen Li
- Department of Pathology, Microbiology and Immunology, School of Medicine, New York Medical College, Valhalla, NY, United States
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16
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Zeng Y, Li N, Liu W, Zeng M, Cheng J, Huang J. Analyses of expressions and prognostic values of Polo-like kinases in non-small cell lung cancer. J Cancer Res Clin Oncol 2020; 146:2447-2460. [PMID: 32627077 DOI: 10.1007/s00432-020-03288-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 06/09/2020] [Indexed: 12/24/2022]
Abstract
BACKGROUND Despite great advances in its early diagnosis and treatment, lung cancer is still an intractable disease and the second leading cause of cancer-related deaths and morbidity in the world. The family of Polo-like kinases (PLKs) consists of five serine/threonine kinases, which have been reported to participate in various human diseases. However, the expression and prognostic value of each PLK in human lung cancer have not been fully understood. This study analyzed mRNA expression and prognostic value of different PLKs in human non-small cell lung cancer (NSCLC). METHODS First, mRNA expression of PLKs in patients with NSCLC from the Oncomine and the Gene Expression Profiling Interactive Analysis (GEPIA) database was investigated. Then, a Kaplan-Meier plotter was employed for survival analysis. The sequence alteration for PLKs was analyzed using The Cancer Genome Atlas (TCGA) and the cBioPortal database. Additionally, we analyzed the association among different PLKs using the LinkedOmics database. Finally, the enrichment analysis of PLKs was achieved using the DAVID database. RESULTS The mRNA expression levels of PLK1 and PLK4 were significantly overexpressed, while mRNA expression level of PLK3 was underexpressed in patients with NSCLC. mRNA expressions of PLK1 and PLK4 were significantly and positively related to the tumor stage of NSCLC. Increased expressions of PLK1, PLK4, and PLK5 and decreased expression of PLK2 were attributed to limited overall survival time in NSCLC. PLK1 was positively correlated with PLK4 via the LinkedOmics database. CONCLUSIONS PLKs are relevant targets for NSCLC treatment, especially PLK1 and PLK4.
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Affiliation(s)
- Yu Zeng
- Department of Respiration, The Second Affiliated Hospital of Guangdong Medical University, 12# Minyou Road, Xiashan, Zhanjiang, 524003, Guangdong, People's Republic of China
- Graduate School, Guangdong Medical University, 2# Wenming Eastern Road, Xiashan, Zhanjiang, 524023, Guangdong, People's Republic of China
| | - Nanhong Li
- Pathological Diagnosis and Research Center, Affiliated Hospital, Guangdong Medical University, 57# Renmin avenue South, Xiashan, Zhanjiang, 524000, Guangdong, People's Republic of China
- Department of Pathology, Guangdong Medical University, 2# Wenming Eastern Road, Xiashan, Zhanjiang, 524023, Guangdong, People's Republic of China
| | - Wang Liu
- Department of Respiration, The Second Affiliated Hospital of Guangdong Medical University, 12# Minyou Road, Xiashan, Zhanjiang, 524003, Guangdong, People's Republic of China
| | - Mingqing Zeng
- First Clinical School of Medicine, Guangdong Medical University, 2# Wenming Eastern Road, Xiashan, Zhanjiang, 524023, Guangdong, People's Republic of China
| | - Junfen Cheng
- Department of Respiration, The Second Affiliated Hospital of Guangdong Medical University, 12# Minyou Road, Xiashan, Zhanjiang, 524003, Guangdong, People's Republic of China.
| | - Jian Huang
- Pathological Diagnosis and Research Center, Affiliated Hospital, Guangdong Medical University, 57# Renmin avenue South, Xiashan, Zhanjiang, 524000, Guangdong, People's Republic of China.
- Department of Pathology, Guangdong Medical University, 2# Wenming Eastern Road, Xiashan, Zhanjiang, 524023, Guangdong, People's Republic of China.
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17
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Buratti J, Ji L, Keren B, Lee Y, Booke S, Erdin S, Kim SY, Palculict TB, Meiner V, Chae JH, Woods CG, Tam A, Héron D, Cong F, Harel T. De novo variants in SIAH1, encoding an E3 ubiquitin ligase, are associated with developmental delay, hypotonia and dysmorphic features. J Med Genet 2020; 58:205-212. [PMID: 32430360 DOI: 10.1136/jmedgenet-2019-106335] [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: 06/03/2019] [Revised: 03/25/2020] [Accepted: 04/03/2020] [Indexed: 12/16/2022]
Abstract
BACKGROUND Ubiquitination has a central role in numerous biological processes, including cell development, stress responses and ageing. Perturbed ubiquitination has been implicated in human diseases ranging from cancer to neurodegenerative diseases. SIAH1 encodes a RING-type E3 ubiquitin ligase involved in protein ubiquitination. Among numerous other roles, SIAH1 regulates metabotropic glutamate receptor signalling and affects neural cell fate. Moreover, SIAH1 positively regulates Wnt signalling through ubiquitin-mediated degradation of Axin and accumulation of β-catenin. METHODS Trio exome sequencing followed by Sanger validation was undertaken in five individuals with syndromic developmental delay. Three-dimensional structural modelling was used to predict pathogenicity of affected residues. Wnt stimulatory activity was measured by luciferase reporter assays and Axin degradation assays in HEK293 cells transfected with wild-type and mutant SIAH1 expression plasmids. RESULTS We report five unrelated individuals with shared features of developmental delay, infantile hypotonia, dysmorphic features and laryngomalacia, in whom exome sequencing identified de novo monoallelic variants in SIAH1. In silico protein modelling suggested alteration of conserved functional sites. In vitro experiments demonstrated loss of Wnt stimulatory activity with the SIAH1 mutants, suggesting variant pathogenicity. CONCLUSION Our results lend support to SIAH1 as a candidate Mendelian disease gene for a recognisable syndrome, further strengthening the connection between SIAH1 and neurodevelopmental disorders. Furthermore, the results suggest that dysregulation of the Wnt/β-catenin pathway may be involved in the pathogenesis.
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Affiliation(s)
- Julien Buratti
- Département de Génétique, Hôpital Pitié-Salpêtrière, Assistance publique-Hôpitaux de Paris, Paris, France
| | - Lei Ji
- Chemical Biology and Therapeutics, Novartis Institutes for Biomedical Research, Cambridge, MA, USA
| | - Boris Keren
- Département de Génétique, Hôpital Pitié-Salpêtrière, Assistance publique-Hôpitaux de Paris, Paris, France
| | - Youngha Lee
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Stephanie Booke
- Department of Pediatrics, Division of Medical Genetics, University of California San Francisco, San Francisco, CA, USA
| | - Serkan Erdin
- Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA, USA.,Program in Medical and Population Genetics, Broad Institute of MIT and Harvard, Cambridge, MA, USA
| | - Soo Yeon Kim
- Department of Pediatrics, Seoul National University Children's Hospital, Seoul, Republic of Korea
| | | | - Vardiella Meiner
- Department of Genetics, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Jong Hee Chae
- Department of Pediatrics, Seoul National University Children's Hospital, Seoul, Republic of Korea
| | - Christopher Geoffrey Woods
- Cambridge Institute for Medical Research, Department of Medical Genetics, Univeristy of Cambridge, Cambridge, UK
| | - Allison Tam
- Department of Pediatrics, Division of Medical Genetics, University of California San Francisco, San Francisco, CA, USA
| | - Delphine Héron
- Département de Génétique et Centre de Référence "déficiences intellectuelles de causes rares", AP-HP, Hôpital de la Pitié-Salpêtrière, Paris, France
| | - Feng Cong
- Chemical Biology and Therapeutics, Novartis Institutes for Biomedical Research, Cambridge, MA, USA
| | - Tamar Harel
- Department of Genetics, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
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18
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Wang Q, Shi W, Zhang Q, Feng W, Wang J, Zhai C, Yan X, Li M. Inhibition of Siah2 ubiquitin ligase ameliorates monocrotaline-induced pulmonary arterial remodeling through inactivation of YAP. Life Sci 2019; 242:117159. [PMID: 31837334 DOI: 10.1016/j.lfs.2019.117159] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 11/23/2019] [Accepted: 12/09/2019] [Indexed: 12/11/2022]
Abstract
AIMS It has been shown that up-regulation of E3 ubiquitin ligase seven-in-absentia-homolog 2 (Siah2) and activation of Hippo signaling pathway effector yes-associated protein (YAP) are involved in the development of pulmonary arterial hypertension (PAH). However, it is still unclear whether Siah2 activates YAP in monocrotaline (MCT)-induced PAH rat models. MAIN METHODS Intraperitoneal injection of MCT was used to induce PAH rat models. The right ventricular systolic pressure (RVSP), right ventricle hypertrophy index (RVHI), percentage of medial wall thickness (%MT), α-SMA, Ki-67 and TUNEL staining were performed to evaluate the development of PAH. Protein levels of Siah2, Lats1/2, YAP phosphorylation and total YAP, and the subcellular localization of YAP were examined using immunoblotting. Proteasome activity was measured by an assay kit. KEY FINDINGS The protein level of Siah2 was significantly increased in MCT-induced PAH rats, this was accompanied with the proteasome-dependent degradation of Lats1/2 and subsequent up-regulation and dephosphorylation of YAP and its nuclear localization. Administration of PAH rats with Siah2 inhibitor Vitamin K3 or proteasome inhibitor MG-132 dramatically suppressed MCT-induced down-regulation of Lats1/2 and activation of YAP, finally reduced RVSP, RVHI, %MT, pulmonary arterial muscularization, pulmonary arterial smooth muscle cells (PASMCs) proliferation and enhanced PASMCs apoptosis in PAH rats. SIGNIFICANCE Siah2 contributes to the development of MCT-induced PAH by destabilizing Lats1/2 and subsequently stimulating YAP activation. Inhibition of Siah2 or proteasome alleviates pulmonary arterial remodeling through inactivation of YAP, indicating Siah2 ubiquitin ligase as a novel target might have potential value in the management of PAH.
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Affiliation(s)
- Qingting Wang
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Wenhua Shi
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Qianqian Zhang
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Wei Feng
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Jian Wang
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Cui Zhai
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Xin Yan
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Manxiang Li
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China.
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19
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Identification and characterization of small molecule inhibitors of the ubiquitin ligases Siah1/2 in melanoma and prostate cancer cells. Cancer Lett 2019; 449:145-162. [PMID: 30771432 DOI: 10.1016/j.canlet.2019.02.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 12/10/2018] [Accepted: 02/10/2019] [Indexed: 12/12/2022]
Abstract
Inhibition of ubiquitin ligases with small molecule remains a very challenging task, given the lack of catalytic activity of the target and the requirement of disruption of its interactions with other proteins. Siah1/2, which are E3 ubiquitin ligases, are implicated in melanoma and prostate cancer and represent high-value drug targets. We utilized three independent screening approaches in our efforts to identify small-molecule Siah1/2 inhibitors: Affinity Selection-Mass Spectrometry, a protein thermal shift-based assay and an in silico based screen. Inhibitors were assessed for their effect on viability of melanoma and prostate cancer cultures, colony formation, prolyl-hydroxylase-HIF1α signaling, expression of selected Siah2-related transcripts, and Siah2 ubiquitin ligase activity. Several analogs were further characterized, demonstrating improved efficacy. Combination of the top hits identified in the different assays demonstrated an additive effect, pointing to complementing mechanisms that underlie each of these Siah1/2 inhibitors.
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20
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Kokate SB, Dixit P, Das L, Rath S, Roy AD, Poirah I, Chakraborty D, Rout N, Singh SP, Bhattacharyya A. Acetylation-mediated Siah2 stabilization enhances PHD3 degradation in Helicobacter pylori-infected gastric epithelial cancer cells. FASEB J 2018; 32:5378-5389. [PMID: 29688807 DOI: 10.1096/fj.201701344rrr] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Gastric epithelial cells infected with Helicobacter pylori acquire highly invasive and metastatic characteristics. The seven in absentia homolog (Siah)2, an E3 ubiquitin ligase, is one of the major proteins that induces invasiveness of infected gastric epithelial cells. We find that p300-driven acetylation of Siah2 at lysine 139 residue stabilizes the molecule in infected cells, thereby substantially increasing its efficiency to degrade prolyl hydroxylase (PHD)3 in the gastric epithelium. This enhances the accumulation of an oncogenic transcription factor hypoxia-inducible factor 1α (Hif1α) in H. pylori-infected gastric cancer cells in normoxic condition and promotes invasiveness of infected cells. Increased acetylation of Siah2, Hif1α accumulation, and the absence of PHD3 in the infected human gastric metastatic cancer biopsy samples and in invasive murine gastric cancer tissues further confirm that the acetylated Siah2 (ac-Siah2)-Hif1α axis is crucial in promoting gastric cancer invasiveness. This study establishes the importance of a previously unrecognized function of ac-Siah2 in regulating invasiveness of H. pylori-infected gastric epithelial cells.-Kokate, S. B., Dixit, P., Das, L., Rath, S., Roy, A. D., Poirah, I., Chakraborty, D., Rout, N., Singh, S. P., Bhattacharyya, A. Acetylation-mediated Siah2 stabilization enhances PHD3 degradation in Helicobacter pylori-infected gastric epithelial cancer cells.
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Affiliation(s)
- Shrikant Babanrao Kokate
- School of Biological Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, Homi Bhabha National Institute (HBNI), Odisha, India
| | - Pragyesh Dixit
- School of Biological Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, Homi Bhabha National Institute (HBNI), Odisha, India
| | - Lopamudra Das
- School of Biological Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, Homi Bhabha National Institute (HBNI), Odisha, India
| | - Suvasmita Rath
- School of Biological Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, Homi Bhabha National Institute (HBNI), Odisha, India
| | - Arjama Dhar Roy
- School of Biological Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, Homi Bhabha National Institute (HBNI), Odisha, India
| | - Indrajit Poirah
- School of Biological Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, Homi Bhabha National Institute (HBNI), Odisha, India
| | - Debashish Chakraborty
- School of Biological Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, Homi Bhabha National Institute (HBNI), Odisha, India
| | - Niranjan Rout
- Department of Oncopathology, Acharya Harihar Regional Cancer Centre, Odisha, India
| | - Shivaram Prasad Singh
- Department of Gastroenterology, Srirama Chandra Bhanja (SCB) Medical College, Odisha, India
| | - Asima Bhattacharyya
- School of Biological Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, Homi Bhabha National Institute (HBNI), Odisha, India
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21
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Abstract
The cellular hypoxic response contributes to cell transformation and tumor progression. Hypoxia-inducible factor 1 (HIF-1) is a key transcription factor that mediates transcription of genes whose products are essential for cellular adaptation to hypoxia. The activity of HIF-1 is largely regulated by the abundance of its alpha subunit (HIF-1α), which is primarily regulated by an oxygen-dependent and ubiquitin/proteasome-mediated degradation process. The HIF-1α protein level is also regulated by protein kinases through phosphorylation. Polo-like kinase 3 (Plk3) is a serine/threonine protein kinase with a tumor suppressive function. Plk3 phosphorylates and destabilizes HIF-1α. Plk3 also phosphorylates and stabilizes PTEN, a known regulator of HIF-1α stability via the PI3K pathway. Our latest study showed that the Plk3 protein is suppressed by hypoxia or nickel treatment via the ubiquitin/proteasome system. We discovered that Seven in Absentia Homologue 2 (SIAH2) is the E3 ubiquitin ligase of Plk3 and that Plk3 in turn destabilizes SIAH2. Given the role of SIAH2 in promoting stability of HIF-1α, our work reveals a novel mutual regulatory mechanism between Plk3 and SIAH2, which may function to fine-tune the cellular hypoxic response. Here we discuss the role of Plk3 in the hypoxic response and tumorigenesis in light of these latest findings.
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Affiliation(s)
- Dazhong Xu
- a Department of Pathology , New York Medical College School of Medicine , Valhalla , NY , USA
| | - Wei Dai
- b Department of Environmental Medicine , New York University Langone Medical Center , Tuxedo , NY , USA
| | - Cen Li
- a Department of Pathology , New York Medical College School of Medicine , Valhalla , NY , USA
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22
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Li C, Park S, Zhang X, Dai W, Xu D. Mutual regulation between Polo-like kinase 3 and SIAH2 E3 ubiquitin ligase defines a regulatory network that fine-tunes the cellular response to hypoxia and nickel. J Biol Chem 2017; 292:11431-11444. [PMID: 28515325 DOI: 10.1074/jbc.m116.767178] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Revised: 05/11/2017] [Indexed: 11/06/2022] Open
Abstract
Elevated cellular response to hypoxia, which contributes to cell transformation and tumor progression, is a prominent feature of malignant cells in solid tumors. Polo-like kinase 3 (Plk3) is a serine/threonine protein kinase known to inhibit the cellular response to hypoxia and tumorigenesis. Nickel compounds are well-established human carcinogens that induce tumorigenesis partly through their hypoxia-mimicking effects. Despite previous research efforts, the role of Plk3 in the hypoxic response induced by hypoxia or nickel is not completely understood. Here, we show that NiCl2 (Ni(II)) or hypoxia reduces the protein level and shortens the half-life of cytoplasmic Plk3 in a ubiquitin-proteasome-dependent manner. We identify SIAH2, a RING finger E3 ubiquitin ligase associated with the cellular hypoxic response, to be the ubiquitin E3 ligase that mediates the degradation of Plk3. We show that SIAH2 binds to Plk3 and mediates its ubiquitination primarily through its polo-box domain. We report that USP28, a deubiquitinase known to be inhibitable by Ni(II) or hypoxia, may also contribute to the suppression of the Plk3 protein by Ni(II). We also show that Plk3 in turn suppresses the SIAH2 protein level in a kinase activity-dependent manner. Our study revealed an interesting mutual regulation between Plk3 and SIAH2 and uncovered a regulatory network that functions to fine-tune the cellular hypoxic response. We propose that suppression of Plk3 expression contributes to carcinogenesis and tumor progression induced by nickel compounds.
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Affiliation(s)
- Cen Li
- From the Department of Pathology, School of Medicine, New York Medical College, Valhalla, New York 10595 and
| | - Soyoung Park
- From the Department of Pathology, School of Medicine, New York Medical College, Valhalla, New York 10595 and
| | - Xiaowen Zhang
- From the Department of Pathology, School of Medicine, New York Medical College, Valhalla, New York 10595 and
| | - Wei Dai
- the Department of Environmental Medicine, New York University School of Medicine, Tuxedo, New York 10987
| | - Dazhong Xu
- From the Department of Pathology, School of Medicine, New York Medical College, Valhalla, New York 10595 and
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23
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Membrane-bound β-catenin degradation is enhanced by ETS2-mediated Siah1 induction in Helicobacter pylori-infected gastric cancer cells. Oncogenesis 2017; 6:e327. [PMID: 28481365 PMCID: PMC5523059 DOI: 10.1038/oncsis.2017.26] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 02/16/2017] [Accepted: 03/20/2017] [Indexed: 12/12/2022] Open
Abstract
β-catenin has two different cellular functions: intercellular adhesion and transcriptional activity. The E3 ubiquitin ligase Siah1 causes ubiquitin-mediated degradation of the cytosolic β-catenin and therefore, impairs nuclear translocation and oncogenic function of β-catenin. However, the effect of Siah1 on the cell membrane bound β-catenin has not been studied. In this study, we identified that the carcinogenic bacterium H. pylori increased ETS2 transcription factor-mediated Siah1 protein expression in gastric cancer cells (GCCs) MKN45, AGS and Kato III. Siah1 protein level was also noticeably higher in gastric adenocarcinoma biopsy samples as compared to non-cancerous gastric epithelia. Siah1 knockdown significantly decreased invasiveness and migration of H. pylori-infected GCCs. Although, Siah1 could not increase degradation of the cytosolic β-catenin and its nuclear translocation, it enhanced degradation of the membrane-bound β-catenin in the infected GCCs. This loss of membrane-bound pool of β-catenin was not associated with the proteasomal degradation of E-cadherin. Thus, this work delineated the role of Siah1 in increasing invasiveness of H. pylori-infected GCCs.
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Koumakis L, Kanterakis A, Kartsaki E, Chatzimina M, Zervakis M, Tsiknakis M, Vassou D, Kafetzopoulos D, Marias K, Moustakis V, Potamias G. MinePath: Mining for Phenotype Differential Sub-paths in Molecular Pathways. PLoS Comput Biol 2016; 12:e1005187. [PMID: 27832067 PMCID: PMC5104320 DOI: 10.1371/journal.pcbi.1005187] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 10/10/2016] [Indexed: 01/04/2023] Open
Abstract
Pathway analysis methodologies couple traditional gene expression analysis with knowledge encoded in established molecular pathway networks, offering a promising approach towards the biological interpretation of phenotype differentiating genes. Early pathway analysis methodologies, named as gene set analysis (GSA), view pathways just as plain lists of genes without taking into account either the underlying pathway network topology or the involved gene regulatory relations. These approaches, even if they achieve computational efficiency and simplicity, consider pathways that involve the same genes as equivalent in terms of their gene enrichment characteristics. Most recent pathway analysis approaches take into account the underlying gene regulatory relations by examining their consistency with gene expression profiles and computing a score for each profile. Even with this approach, assessing and scoring single-relations limits the ability to reveal key gene regulation mechanisms hidden in longer pathway sub-paths. We introduce MinePath, a pathway analysis methodology that addresses and overcomes the aforementioned problems. MinePath facilitates the decomposition of pathways into their constituent sub-paths. Decomposition leads to the transformation of single-relations to complex regulation sub-paths. Regulation sub-paths are then matched with gene expression sample profiles in order to evaluate their functional status and to assess phenotype differential power. Assessment of differential power supports the identification of the most discriminant profiles. In addition, MinePath assess the significance of the pathways as a whole, ranking them by their p-values. Comparison results with state-of-the-art pathway analysis systems are indicative for the soundness and reliability of the MinePath approach. In contrast with many pathway analysis tools, MinePath is a web-based system (www.minepath.org) offering dynamic and rich pathway visualization functionality, with the unique characteristic to color regulatory relations between genes and reveal their phenotype inclination. This unique characteristic makes MinePath a valuable tool for in silico molecular biology experimentation as it serves the biomedical researchers' exploratory needs to reveal and interpret the regulatory mechanisms that underlie and putatively govern the expression of target phenotypes.
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Affiliation(s)
- Lefteris Koumakis
- Computational BioMedicine Laboratory (CBML), Institute of Computers Science (ICS), Foundation for Research and Technology-Hellas (FORTH), Heraklion, Crete, Greece
| | - Alexandros Kanterakis
- Computational BioMedicine Laboratory (CBML), Institute of Computers Science (ICS), Foundation for Research and Technology-Hellas (FORTH), Heraklion, Crete, Greece
| | - Evgenia Kartsaki
- Computational BioMedicine Laboratory (CBML), Institute of Computers Science (ICS), Foundation for Research and Technology-Hellas (FORTH), Heraklion, Crete, Greece
| | - Maria Chatzimina
- Computational BioMedicine Laboratory (CBML), Institute of Computers Science (ICS), Foundation for Research and Technology-Hellas (FORTH), Heraklion, Crete, Greece
| | - Michalis Zervakis
- School of Electrical and Computer Engineering, Technical University of Crete, Greece
| | - Manolis Tsiknakis
- Computational BioMedicine Laboratory (CBML), Institute of Computers Science (ICS), Foundation for Research and Technology-Hellas (FORTH), Heraklion, Crete, Greece
- Department of Informatics Engineering, Technological Educational Institute of Crete, Greece
| | - Despoina Vassou
- Institute of Molecular Biology & Biotechnology, FORTH, Heraklion, Crete, Greece
| | | | - Kostas Marias
- Computational BioMedicine Laboratory (CBML), Institute of Computers Science (ICS), Foundation for Research and Technology-Hellas (FORTH), Heraklion, Crete, Greece
| | - Vassilis Moustakis
- School of Production Engineering & Management, Technical University of Crete, Greece
| | - George Potamias
- Computational BioMedicine Laboratory (CBML), Institute of Computers Science (ICS), Foundation for Research and Technology-Hellas (FORTH), Heraklion, Crete, Greece
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Zhang Q, Wang Z, Hou F, Harding R, Huang X, Dong A, Walker JR, Tong Y. The substrate binding domains of human SIAH E3 ubiquitin ligases are now crystal clear. Biochim Biophys Acta Gen Subj 2016; 1861:3095-3105. [PMID: 27776223 DOI: 10.1016/j.bbagen.2016.10.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 10/03/2016] [Accepted: 10/19/2016] [Indexed: 10/20/2022]
Abstract
BACKGROUND Seven in absentia homologs (SIAHs) comprise a family of highly conserved E3 ubiquitin ligases that play an important role in regulating signalling pathways in tumorigenesis, including the DNA damage repair and hypoxia response pathways. SIAH1 and SIAH2 have been found to function as a tumour repressor and a proto-oncogene, respectively, despite the high sequence identity of their substrate binding domains (SBDs). Ubiquitin-specific protease USP19 is a deubiquitinase that forms a complex with SIAHs and counteracts the ligase function. Much effort has been made to find selective inhibitors of the SIAHs E3 ligases. Menadione was reported to inhibit SIAH2 specifically. METHODS We used X-ray crystallography, peptide array, bioinformatic analysis, and biophysical techniques to characterize the structure and interaction of SIAHs with deubiquitinases and literature reported compounds. RESULTS We solved the crystal structures of SIAH1 in complex with a USP19 peptide and of the apo form SIAH2. Phylogenetic analysis revealed the SIAH/USP19 complex is conserved in evolution. We demonstrated that menadione destabilizes both SIAH1 and SIAH2 non-specifically through covalent modification. CONCLUSIONS The SBDs of SIAH E3 ligases are structurally similar with a subtle stability difference. USP19 is the only deubiquitinase that directly binds to SIAHs through the substrate binding pocket. Menadione is not a specific inhibitor for SIAH2. GENERAL SIGNIFICANCE The crystallographic models provide structural insights into the substrate binding of the SIAH family E3 ubiquitin ligases that are critically involved in regulating cancer-related pathways. Our results suggest caution should be taken when using menadione as a specific SIAH2 inhibitor.
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Affiliation(s)
- Qi Zhang
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Zhongduo Wang
- Fisheries College, Guangdong Ocean University, Zhanjiang, Guangdong 524025, China
| | - Feng Hou
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Rachel Harding
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Xinyi Huang
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Aiping Dong
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - John R Walker
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Yufeng Tong
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada; Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario M5G 1L7, Canada.
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27
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Adam MG, Matt S, Christian S, Hess-Stumpp H, Haegebarth A, Hofmann TG, Algire C. SIAH ubiquitin ligases regulate breast cancer cell migration and invasion independent of the oxygen status. Cell Cycle 2016; 14:3734-47. [PMID: 26654769 PMCID: PMC4825722 DOI: 10.1080/15384101.2015.1104441] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Seven-in-absentia homolog (SIAH) proteins are evolutionary conserved RING type E3 ubiquitin ligases responsible for the degradation of key molecules regulating DNA damage response, hypoxic adaptation, apoptosis, angiogenesis, and cell proliferation. Many studies suggest a tumorigenic role for SIAH2. In breast cancer patients SIAH2 expression levels correlate with cancer aggressiveness and overall patient survival. In addition, SIAH inhibition reduced metastasis in melanoma. The role of SIAH1 in breast cancer is still ambiguous; both tumorigenic and tumor suppressive functions have been reported. Other studies categorized SIAH ligases as either pro- or antimigratory, while the significance for metastasis is largely unknown. Here, we re-evaluated the effects of SIAH1 and SIAH2 depletion in breast cancer cell lines, focusing on migration and invasion. We successfully knocked down SIAH1 and SIAH2 in several breast cancer cell lines. In luminal type MCF7 cells, this led to stabilization of the SIAH substrate Prolyl Hydroxylase Domain protein 3 (PHD3) and reduced Hypoxia-Inducible Factor 1α (HIF1α) protein levels. Both the knockdown of SIAH1 or SIAH2 led to increased apoptosis and reduced proliferation, with comparable effects. These results point to a tumor promoting role for SIAH1 in breast cancer similar to SIAH2. In addition, depletion of SIAH1 or SIAH2 also led to decreased cell migration and invasion in breast cancer cells. SIAH knockdown also controlled microtubule dynamics by markedly decreasing the protein levels of stathmin, most likely via p27(Kip1). Collectively, these results suggest that both SIAH ligases promote a migratory cancer cell phenotype and could contribute to metastasis in breast cancer.
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Affiliation(s)
- M Gordian Adam
- a Cellular Senescence Group ; German Cancer Research Center DKFZ ; Heidelberg , Germany.,b GTRG Oncology II; GDD; Bayer Pharma AG ; Berlin , Germany
| | - Sonja Matt
- a Cellular Senescence Group ; German Cancer Research Center DKFZ ; Heidelberg , Germany
| | - Sven Christian
- b GTRG Oncology II; GDD; Bayer Pharma AG ; Berlin , Germany
| | | | | | - Thomas G Hofmann
- a Cellular Senescence Group ; German Cancer Research Center DKFZ ; Heidelberg , Germany
| | - Carolyn Algire
- b GTRG Oncology II; GDD; Bayer Pharma AG ; Berlin , Germany
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van Reesema LLS, Zheleva V, Winston JS, Jansen RJ, O'Connor CF, Isbell AJ, Bian M, Qin R, Bassett PT, Hinson VJ, Dorsch KA, Kirby BW, Van Sciver RE, Tang-Tan AM, Harden EA, Chang DZ, Allen CA, Perry RR, Hoefer RA, Tang AH. SIAH and EGFR, Two RAS Pathway Biomarkers, are Highly Prognostic in Locally Advanced and Metastatic Breast Cancer. EBioMedicine 2016; 11:183-198. [PMID: 27569656 PMCID: PMC5049993 DOI: 10.1016/j.ebiom.2016.08.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 08/03/2016] [Accepted: 08/10/2016] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Metastatic breast cancer exhibits diverse and rapidly evolving intra- and inter-tumor heterogeneity. Patients with similar clinical presentations often display distinct tumor responses to standard of care (SOC) therapies. Genome landscape studies indicate that EGFR/HER2/RAS "pathway" activation is highly prevalent in malignant breast cancers. The identification of therapy-responsive and prognostic biomarkers is paramount important to stratify patients and guide therapies in clinical oncology and personalized medicine. METHODS In this study, we analyzed matched pairs of tumor specimens collected from 182 patients who received neoadjuvant systemic therapies (NST). Statistical analyses were conducted to determine whether EGFR/HER2/RAS pathway biomarkers and clinicopathological predictors, alone and in combination, are prognostic in breast cancer. FINDINGS SIAH and EGFR outperform ER, PR, HER2 and Ki67 as two logical, sensitive and prognostic biomarkers in metastatic breast cancer. We found that increased SIAH and EGFR expression correlated with advanced pathological stage and aggressive molecular subtypes. Both SIAH expression post-NST and NST-induced changes in EGFR expression in invasive mammary tumors are associated with tumor regression and increased survival, whereas ER, PR, and HER2 were not. These results suggest that SIAH and EGFR are two prognostic biomarkers in breast cancer with lymph node metastases. INTERPRETATION The discovery of incorporating tumor heterogeneity-independent and growth-sensitive RAS pathway biomarkers, SIAH and EGFR, whose altered expression can be used to estimate therapeutic efficacy, detect emergence of resistant clones, forecast tumor regression, differentiate among partial responders, and predict patient survival in the neoadjuvant setting, has a clear clinical implication in personalizing breast cancer therapy. FUNDING This work was supported by the Dorothy G. Hoefer Foundation for Breast Cancer Research (A.H. Tang); Center for Innovative Technology (CIT)-Commonwealth Research Commercialization Fund (CRCF) (MF14S-009-LS to A.H. Tang), and National Cancer Institute (CA140550 to A.H. Tang).
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Affiliation(s)
- Lauren L Siewertsz van Reesema
- Department of Microbiology and Molecular Cell Biology, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States
| | - Vasilena Zheleva
- Department of Surgery, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States
| | - Janet S Winston
- Sentara Pathology and Pathology Sciences Medical Group, Department of Pathology, Sentara Norfolk General Hospital (SNGH), 600 Gresham Drive, Norfolk, VA 23507, United States
| | - Rick J Jansen
- Department of Public Health, North Dakota State University, Fargo, ND 58102, United States
| | - Carolyn F O'Connor
- Department of Microbiology and Molecular Cell Biology, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States
| | - Andrew J Isbell
- Department of Microbiology and Molecular Cell Biology, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States
| | - Minglei Bian
- Department of Microbiology and Molecular Cell Biology, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States
| | - Rui Qin
- Department of Health Sciences Research, Mayo Clinic Cancer Center, Mayo Clinic, Rochester, MN 55905, United States
| | - Patricia T Bassett
- Sentara Pathology and Pathology Sciences Medical Group, Department of Pathology, Sentara Norfolk General Hospital (SNGH), 600 Gresham Drive, Norfolk, VA 23507, United States
| | - Virginia J Hinson
- Sentara Pathology and Pathology Sciences Medical Group, Department of Pathology, Sentara Norfolk General Hospital (SNGH), 600 Gresham Drive, Norfolk, VA 23507, United States
| | - Kimberly A Dorsch
- Sentara Cancer Network, 11803 Jefferson Avenue, Suite 235, Newport News, Virginia 23606, United States
| | - Brad W Kirby
- Sentara Cancer Network, 11803 Jefferson Avenue, Suite 235, Newport News, Virginia 23606, United States
| | - Robert E Van Sciver
- Department of Microbiology and Molecular Cell Biology, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States
| | - Angela M Tang-Tan
- Princess Anne High School, International Baccalaureate (IB) Gifted and Talented Program, 4400 Virginia Beach Boulevard, Virginia Beach, VA 23462, United States
| | - Elizabeth A Harden
- Dorothy G. Hoefer Comprehensive Breast Center, 11803 Jefferson Avenue, Suite 235, Newport News, Virginia 23606, United States; Virginia Oncology Associates, 1051 Loftis Blvd, Suite 100, Newport News, VA 23606, United States
| | - David Z Chang
- Virginia Oncology Associates, 1051 Loftis Blvd, Suite 100, Newport News, VA 23606, United States
| | - Cynthia A Allen
- Sentara Cancer Network, 11803 Jefferson Avenue, Suite 235, Newport News, Virginia 23606, United States
| | - Roger R Perry
- Department of Surgery, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States
| | - Richard A Hoefer
- Sentara Cancer Network, 11803 Jefferson Avenue, Suite 235, Newport News, Virginia 23606, United States; Dorothy G. Hoefer Comprehensive Breast Center, 11803 Jefferson Avenue, Suite 235, Newport News, Virginia 23606, United States; Sentara CarePlex Hospital, 11803 Jefferson Avenue, Suite 235, Newport News, Virginia 23606, United States
| | - Amy H Tang
- Department of Microbiology and Molecular Cell Biology, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States.
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Flores-Pérez A, Marchat LA, Rodríguez-Cuevas S, Bautista VP, Fuentes-Mera L, Romero-Zamora D, Maciel-Dominguez A, de la Cruz OH, Fonseca-Sánchez M, Ruíz-García E, la Vega HAD, López-Camarillo C. Suppression of cell migration is promoted by miR-944 through targeting of SIAH1 and PTP4A1 in breast cancer cells. BMC Cancer 2016; 16:379. [PMID: 27377268 PMCID: PMC4932667 DOI: 10.1186/s12885-016-2470-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Accepted: 06/29/2016] [Indexed: 11/19/2022] Open
Abstract
Background Aberrant expression of microRNAs has been associated with migration of tumor cells. In this study, we aimed to investigate the biological significance of miR-944 whose function is unknown in breast cancer. Methods MiR-944 expression in breast cancer cells and tumors was evaluated by Taqman qRT-PCR assays. Transcriptional profiling of MDA-MB-231 cells expressing miR-944 was performed using DNA microarrays. Cell viability, migration and invasion were assessed by MTT, scratch/wound-healing and transwell chamber assays, respectively. The luciferase reporter assay was used to evaluate targeting of SIAH1, PTP4A1 and PRKCA genes by miR-944. SIAH1 protein levels were measured by Western blot. Silencing of SIAH1 gene was performed by RNA interference using shRNAs. Results Our data showed that miR-944 expression was severely repressed in clinical specimens and breast cancer cell lines. Suppression of miR-944 levels was independent of hormonal status and metastatic potential of breast cancer cells. Gain-of-function analysis indicated that miR-944 altered the actin cytoskeleton dynamics and impaired cell migration and invasion. Genome-wide transcriptional profiling of MDA-MB-231 cells that ectopically express miR-944 showed that 15 genes involved in migration were significantly repressed. Notably, luciferase reporter assays confirmed the ability of miR-944 to bind the 3´UTR of SIAH1 and PTP4A1 genes, but not PRKCA gene. Congruently, an inverse correlation between miR-944 and SIAH1 protein expression was found in breast cancer cells. Moreover, SIAH1 was upregulated in 75 % of miR-944-deficient breast tumors. Finally, SIAH1 gene silencing by RNA interference significantly impaired cell migration of breast cancer cells. Conclusions Our results pointed out that miR-944 is a novel upstream negative regulator of SIAH1 and PTP4A1 genes and provided for the first time evidence for its functional role in migration and invasion of breast cancer cells. They also suggest that miR-944 restoration may represent a potential strategy for breast cancer therapy. Electronic supplementary material The online version of this article (doi:10.1186/s12885-016-2470-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Ali Flores-Pérez
- Universidad Autónoma de la Ciudad de México, Posgrado en Ciencias Genómicas, Ciudad de México, México
| | - Laurence A Marchat
- Programa en Biomedicina Molecular y Red de Biotecnología, Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional, Ciudad de México, México
| | | | | | | | - Diana Romero-Zamora
- Universidad Autónoma de la Ciudad de México, Posgrado en Ciencias Genómicas, Ciudad de México, México
| | - Anabel Maciel-Dominguez
- Universidad Autónoma de la Ciudad de México, Posgrado en Ciencias Genómicas, Ciudad de México, México
| | - Olga Hernández de la Cruz
- Universidad Autónoma de la Ciudad de México, Posgrado en Ciencias Genómicas, Ciudad de México, México
| | - Miguel Fonseca-Sánchez
- Universidad Autónoma de la Ciudad de México, Posgrado en Ciencias Genómicas, Ciudad de México, México
| | - Erika Ruíz-García
- Laboratorio de Medicina Translacional, Instituto Nacional de Cancerología, Ciudad de México, México
| | - Horacio Astudillo-de la Vega
- Laboratorio de Investigación en Cáncer Translacional y Terapia Celular, Centro Médico Siglo XXI, Ciudad de México, México
| | - César López-Camarillo
- Universidad Autónoma de la Ciudad de México, Posgrado en Ciencias Genómicas, Ciudad de México, México. .,San Lorenzo 290. Col. Del Valle. CP 03100, Mexico City, México.
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Wlochowitz D, Haubrock M, Arackal J, Bleckmann A, Wolff A, Beißbarth T, Wingender E, Gültas M. Computational Identification of Key Regulators in Two Different Colorectal Cancer Cell Lines. Front Genet 2016; 7:42. [PMID: 27092172 PMCID: PMC4820448 DOI: 10.3389/fgene.2016.00042] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Accepted: 03/14/2016] [Indexed: 12/12/2022] Open
Abstract
Transcription factors (TFs) are gene regulatory proteins that are essential for an effective regulation of the transcriptional machinery. Today, it is known that their expression plays an important role in several types of cancer. Computational identification of key players in specific cancer cell lines is still an open challenge in cancer research. In this study, we present a systematic approach which combines colorectal cancer (CRC) cell lines, namely 1638N-T1 and CMT-93, and well-established computational methods in order to compare these cell lines on the level of transcriptional regulation as well as on a pathway level, i.e., the cancer cell-intrinsic pathway repertoire. For this purpose, we firstly applied the Trinity platform to detect signature genes, and then applied analyses of the geneXplain platform to these for detection of upstream transcriptional regulators and their regulatory networks. We created a CRC-specific position weight matrix (PWM) library based on the TRANSFAC database (release 2014.1) to minimize the rate of false predictions in the promoter analyses. Using our proposed workflow, we specifically focused on revealing the similarities and differences in transcriptional regulation between the two CRC cell lines, and report a number of well-known, cancer-associated TFs with significantly enriched binding sites in the promoter regions of the signature genes. We show that, although the signature genes of both cell lines show no overlap, they may still be regulated by common TFs in CRC. Based on our findings, we suggest that canonical Wnt signaling is activated in 1638N-T1, but inhibited in CMT-93 through cross-talks of Wnt signaling with the VDR signaling pathway and/or LXR-related pathways. Furthermore, our findings provide indication of several master regulators being present such as MLK3 and Mapk1 (ERK2) which might be important in cell proliferation, migration, and invasion of 1638N-T1 and CMT-93, respectively. Taken together, we provide new insights into the invasive potential of these cell lines, which can be used for development of effective cancer therapy.
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Affiliation(s)
- Darius Wlochowitz
- Institute of Bioinformatics, University Medical Center Göttingen Göttingen, Germany
| | - Martin Haubrock
- Institute of Bioinformatics, University Medical Center Göttingen Göttingen, Germany
| | - Jetcy Arackal
- Department of Hematology/Medical Oncology, University Medical Center Göttingen Göttingen, Germany
| | - Annalen Bleckmann
- Department of Hematology/Medical Oncology, University Medical Center Göttingen Göttingen, Germany
| | - Alexander Wolff
- Department of Medical Statistics, University Medical Center Göttingen Göttingen, Germany
| | - Tim Beißbarth
- Department of Medical Statistics, University Medical Center Göttingen Göttingen, Germany
| | - Edgar Wingender
- Institute of Bioinformatics, University Medical Center Göttingen Göttingen, Germany
| | - Mehmet Gültas
- Institute of Bioinformatics, University Medical Center Göttingen Göttingen, Germany
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31
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Maneix L, Catic A. Touch and go: nuclear proteolysis in the regulation of metabolic genes and cancer. FEBS Lett 2016; 590:908-23. [PMID: 26832397 PMCID: PMC4833644 DOI: 10.1002/1873-3468.12087] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 01/15/2016] [Accepted: 01/26/2016] [Indexed: 01/07/2023]
Abstract
The recruitment of transcription factors to promoters and enhancers is a critical step in gene regulation. Many of these proteins are quickly removed from DNA after they completed their function. Metabolic genes in particular are dynamically regulated and continuously adjusted to cellular requirements. Transcription factors controlling metabolism are therefore under constant surveillance by the ubiquitin–proteasome system, which can degrade DNA‐bound proteins in a site‐specific manner. Several of these metabolic transcription factors are critical to cancer cells, as they promote uncontrolled growth and proliferation. This review highlights recent findings in the emerging field of nuclear proteolysis and outlines novel paradigms for cancer treatment, with an emphasis on multiple myeloma.
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Affiliation(s)
- Laure Maneix
- Huffington Center on Aging, Baylor College of Medicine, Houston, TX, USA.,Dan L. Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX, USA
| | - André Catic
- Huffington Center on Aging, Baylor College of Medicine, Houston, TX, USA.,Dan L. Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX, USA.,Stem Cells and Regenerative Medicine Center, Baylor College of Medicine, Houston, TX, USA.,Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
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García-Limones C, Lara-Chica M, Jiménez-Jiménez C, Pérez M, Moreno P, Muñoz E, Calzado MA. CHK2 stability is regulated by the E3 ubiquitin ligase SIAH2. Oncogene 2016; 35:4289-301. [PMID: 26751770 DOI: 10.1038/onc.2015.495] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Revised: 11/24/2015] [Accepted: 11/27/2015] [Indexed: 01/14/2023]
Abstract
The serine threonine checkpoint kinase 2 (CHK2) is a critical protein involved in the DNA damage-response pathway, which is activated by phosphorylation inducing cellular response such as DNA repair, cell-cycle regulation or apoptosis. Although CHK2 activation mechanisms have been amply described, very little is known about degradation control processes. In the present study, we identify the ubiquitin E3 ligase SIAH2 as an interaction partner of CHK2, which mediates its ubiquitination and proteasomal degradation. CHK2 degradation is independent of both its activation and its kinase activity, but also of the phosphorylation in S456. We show that SIAH2-deficient cells present CHK2 accumulation together with lower ubiquitination levels. Accordingly, SIAH2 depletion by siRNA increases CHK2 levels. In response to DNA damage induced by etoposide, interaction between both proteins is disrupted, thus avoiding CHK2 degradation and promoting its stabilization. We also found that CHK2 phosphorylates SIAH2 at three residues (Thr26, Ser28 and Thr119), modifying its ability to regulate certain substrates. Cellular arrest in the G2/M phase induced by DNA damage is reverted by SIAH2 expression through the control of CHK2 levels. We observed that hypoxia decreases CHK2 levels in parallel to SIAH2 induction. Similarly, we provide evidence suggesting that resistance to apoptosis induced by genotoxic agents in cells subjected to hypoxia could be partly explained by the mutual regulation between both proteins. These results indicate that SIAH2 regulates CHK2 basal turnover, with important consequences on cell-cycle control and on the ability of hypoxia to alter the DNA damage-response pathway in cancer cells.
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Affiliation(s)
- C García-Limones
- Department of Cell Biology, Physiology and Immunology, University of Córdoba, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC)/Hospital, Universitario Reina Sofía, Córdoba, Spain
| | - M Lara-Chica
- Department of Cell Biology, Physiology and Immunology, University of Córdoba, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC)/Hospital, Universitario Reina Sofía, Córdoba, Spain
| | - C Jiménez-Jiménez
- Department of Cell Biology, Physiology and Immunology, University of Córdoba, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC)/Hospital, Universitario Reina Sofía, Córdoba, Spain
| | - M Pérez
- Department of Cell Biology, Physiology and Immunology, University of Córdoba, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC)/Hospital, Universitario Reina Sofía, Córdoba, Spain
| | - P Moreno
- Department of Cell Biology, Physiology and Immunology, University of Córdoba, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC)/Hospital, Universitario Reina Sofía, Córdoba, Spain
| | - E Muñoz
- Department of Cell Biology, Physiology and Immunology, University of Córdoba, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC)/Hospital, Universitario Reina Sofía, Córdoba, Spain
| | - M A Calzado
- Department of Cell Biology, Physiology and Immunology, University of Córdoba, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC)/Hospital, Universitario Reina Sofía, Córdoba, Spain
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Overexpression of Siah2 Is Associated With Poor Prognosis in Patients With Epithelial Ovarian Carcinoma. Int J Gynecol Cancer 2016; 26:114-9. [DOI: 10.1097/igc.0000000000000574] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
ObjectivesSeven in absentia homolog 2 (Siah2) is an E3 ubiquitin ligase that is expressed in mammals and is homologous to seven in absentia in Drosophila. Siah2 is involved in the progression of many malignancies. However, the role of Siah2 in ovarian cancer remains unclear. This study aims to evaluate the prognostic value of Siah2 expression for epithelial ovarian carcinoma (EOC) patients.Materials and MethodsImmunohistochemical analysis was conducted using 32 normal ovarian specimens and 122 ovarian carcinoma specimens, respectively. We analyzed the correlations of Siah2 expression with the clinicopathological factors and prognosis of ovarian cancer patients. χ2 Analysis, Kaplan-Meier method, and multivariate Cox proportional hazard analysis were conducted for statistical analyses.ResultsImmunohistochemical staining demonstrated that the expression of Siah2 was higher in the EOC tissues than in the normal tissues. High Siah2 expression positively correlated with histological grade and lymph node metastasis but not with age, histologic type, International Federation of Gynecology and Obstetrics staging, and CA125. Patients with positive Siah2 expression showed lower overall survival and disease-free survival rates than those with negative Siah2 expression (P < 0.05 for both). Multivariate Cox analysis indicated that Siah2 was an independent parameter for overall survival (hazards ratio, 2.166; 95% confidence interval, 1.182–3.970; P = 0.012) and disease-free survival (hazards ratio, 1.819; 95% confidence interval, 1.030–3.216; P = 0.039).ConclusionsSiah2 is possibly involved in tumor development and progression in EOC. Thus, Siah2 is a promising biomarker for predicting the prognosis of ovarian cancer patients and may serve as a novel target for treating ovarian carcinoma.
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Chen A, Wong CSF, Liu MCP, House CM, Sceneay J, Bowtell DD, Thompson EW, Möller A. The ubiquitin ligase Siah is a novel regulator of Zeb1 in breast cancer. Oncotarget 2015; 6:862-73. [PMID: 25528765 PMCID: PMC4359261 DOI: 10.18632/oncotarget.2696] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Accepted: 11/04/2014] [Indexed: 01/11/2023] Open
Abstract
Elucidating the mechanisms that underlie metastasis is of paramount importance to understanding tumor progression and to the development of novel therapeutics. Epithelial to Mesenchymal Transition (EMT) plays a vital role in tumor cell dissemination and is regulated by a core cassette of transcription factors. Despite recent advances, the molecular pathways that regulate the EMT program have not yet been fully delineated. We show that Siah ubiquitin ligases regulate Zeb1 protein, a key EMT transcription factor. The induction of EMT in breast cancer cells leads to the down-regulation of Siah, while the loss of Siah induces a mesenchymal phenotype, concurrent with an up-regulation of Zeb1. Overexpression of Siah in vitro mediates Zeb1 degradation, which can be blocked with a Siah peptide inhibitor. Thus, this work demonstrates that Siah is a novel regulator of EMT. This work is the first to identify a mechanism of post-translational regulation of the key Epithelial to Mesenchymal Transition transcription factor Zeb1.
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Affiliation(s)
- Anna Chen
- Cancer Genomics and Genetics Laboratory, Peter MacCallum Cancer Centre, St. Andrews Place, East Melbourne 3002, Australia.,Department of Pathology, The University of Melbourne, Parkville 3010, Australia
| | - Christina S F Wong
- Tumour Microenvironment Laboratory, QIMR Berghofer Medical Research Institute, Herston 4006, Australia
| | - Mira C P Liu
- Cancer Genomics and Genetics Laboratory, Peter MacCallum Cancer Centre, St. Andrews Place, East Melbourne 3002, Australia
| | - Colin M House
- Cancer Genomics and Genetics Laboratory, Peter MacCallum Cancer Centre, St. Andrews Place, East Melbourne 3002, Australia
| | - Jaclyn Sceneay
- Tumour Microenvironment Laboratory, QIMR Berghofer Medical Research Institute, Herston 4006, Australia
| | - David D Bowtell
- Cancer Genomics and Genetics Laboratory, Peter MacCallum Cancer Centre, St. Andrews Place, East Melbourne 3002, Australia.,Department of Pathology, The University of Melbourne, Parkville 3010, Australia.,Sir Peter MacCallum Department of Oncology, The University of Melbourne, Parkville 3010, Australia.,Department of Biochemistry, The University of Melbourne, Parkville 3010, Australia
| | - Erik W Thompson
- The University of Melbourne Department of Surgery, St Vincent's Hospital, Fitzroy 3065, Australia.,St Vincent's Institute of Medical Research, Fitzroy 3065, Australia.,Institute of Health and Biomedical Innovation and School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove 4000, Australia
| | - Andreas Möller
- Tumour Microenvironment Laboratory, QIMR Berghofer Medical Research Institute, Herston 4006, Australia
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35
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Moreno P, Lara-Chica M, Soler-Torronteras R, Caro T, Medina M, Álvarez A, Salvatierra Á, Muñoz E, Calzado MA. The Expression of the Ubiquitin Ligase SIAH2 (Seven In Absentia Homolog 2) Is Increased in Human Lung Cancer. PLoS One 2015; 10:e0143376. [PMID: 26580787 PMCID: PMC4651316 DOI: 10.1371/journal.pone.0143376] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Accepted: 11/04/2015] [Indexed: 11/30/2022] Open
Abstract
OBJECTIVES Lung cancer is the leading cause of cancer-related deaths worldwide. Overall 5-year survival has shown little improvement over the last decades. Seven in absentia homolog (SIAH) proteins are E3 ubiquitin ligases that mediate proteasomal protein degradation by poly-ubiquitination. Even though SIAH proteins play a key role in several biological processes, their role in human cancer remains controversial. The aim of the study was to document SIAH2 expression pattern at different levels (mRNA, protein level and immunohistochemistry) in human non-small cell lung cancer (NSCLC) samples compared to surrounding healthy tissue from the same patient, and to analyse the association with clinicopathological features. MATERIALS AND METHODS One hundred and fifty-two samples from a patient cohort treated surgically for primary lung cancer were obtained for the study. Genic and protein expression levels of SIAH2 were analysed and compared with clinic-pathologic variables. RESULTS The present study is the first to analyze the SIAH2 expression pattern at different levels (RNA, protein expression and immunohistochemistry) in non-small cell lung cancer (NSCLC). We found that SIAH2 protein expression is significantly enhanced in human lung adenocarcinoma (ADC) and squamous cell lung cancer (SCC). Paradoxically, non-significant changes at RNA level were found, suggesting a post-traductional regulatory mechanism. More importantly, an increased correlation between SIAH2 expression and tumor grade was detected, suggesting that this protein could be used as a prognostic biomarker to predict lung cancer progression. Likewise, SIAH2 protein expression showed a strong positive correlation with fluorodeoxyglucose (2-deoxy-2(18F)fluoro-D-glucose) uptake in primary NSCLC, which may assist clinicians in stratifying patients at increased overall risk of poor survival. Additionally, we described an inverse correlation between the expression of SIAH2 and the levels of one of its substrates, the serine/threonine kinase DYRK2. CONCLUSIONS Our results provide insight into the potential use of SIAH2 as a novel target for lung cancer treatment.
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Affiliation(s)
- Paula Moreno
- Department of Cell Biology, Physiology and Immunology, University of Córdoba, Spain, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC)/ Hospital Universitario Reina Sofía, 14004 Córdoba, Spain
- Thoracic Surgery and Lung Transplantation Unit, Hospital Universitario Reina Sofía, 14004 Córdoba, Spain
| | - Maribel Lara-Chica
- Department of Cell Biology, Physiology and Immunology, University of Córdoba, Spain, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC)/ Hospital Universitario Reina Sofía, 14004 Córdoba, Spain
| | - Rafael Soler-Torronteras
- Department of Cell Biology, Physiology and Immunology, University of Córdoba, Spain, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC)/ Hospital Universitario Reina Sofía, 14004 Córdoba, Spain
| | - Teresa Caro
- Department of Pathology, Hospital Universitario Reina Sofía, Spain, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC)/ University of Córdoba, 14004 Córdoba, Spain
| | - Manuel Medina
- Department of Pathology, Hospital Universitario Reina Sofía, Spain, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC)/ University of Córdoba, 14004 Córdoba, Spain
| | - Antonio Álvarez
- Thoracic Surgery and Lung Transplantation Unit, Hospital Universitario Reina Sofía, 14004 Córdoba, Spain
| | - Ángel Salvatierra
- Thoracic Surgery and Lung Transplantation Unit, Hospital Universitario Reina Sofía, 14004 Córdoba, Spain
| | - Eduardo Muñoz
- Department of Cell Biology, Physiology and Immunology, University of Córdoba, Spain, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC)/ Hospital Universitario Reina Sofía, 14004 Córdoba, Spain
| | - Marco A. Calzado
- Department of Cell Biology, Physiology and Immunology, University of Córdoba, Spain, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC)/ Hospital Universitario Reina Sofía, 14004 Córdoba, Spain
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Loss of Siah2 does not impact angiogenic potential of murine endothelial cells. Microvasc Res 2015; 102:38-45. [PMID: 26275748 DOI: 10.1016/j.mvr.2015.08.003] [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: 04/20/2015] [Revised: 08/04/2015] [Accepted: 08/06/2015] [Indexed: 11/20/2022]
Abstract
Angiogenesis is triggered in response to hypoxia under many circumstances, from healthy cells and tissues during embryogenesis to pathological conditions like the formation of new blood vessels to supply tumours and promote invasive cancer. Siah2 has been shown to regulate the hypoxia pathway upstream of hypoxia-induced transcription factor subunit Hif-1alpha, and therefore may play an important role in angiogenesis in response to hypoxic stress in endothelial cells. This study aims to investigate the basic function of Siah2 in endothelial cells under hypoxia and to test the ability of Siah2 deficient cells to mount an angiogenic response when deprived of oxygen. We and others have previously shown that Siah2 is crucial for mediating the hypoxic response in many different cell types studied. In this study however, we describe that Siah2(-/-) endothelial cells have an intact hypoxic signalling pathway, including Hif-1alpha stabilisation and gene expression, the first report of a tissue or cell lineage in which the loss of Siah2 does not seem to impact hypoxic response signalling. In mice, the infiltration of Siah2(-/-) endothelial cells into a Matrigel plug containing a VEGF-A attractant was similar compared with wildtype endothelial cells. Ex vivo however, there was a reduced capacity of Siah2(-/-) aorta to form tubes or new vessels. Thus, we conclude that Siah2 is not essential for the hypoxic response of endothelial cells.
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Knauer SK, Mahendrarajah N, Roos WP, Krämer OH. The inducible E3 ubiquitin ligases SIAH1 and SIAH2 perform critical roles in breast and prostate cancers. Cytokine Growth Factor Rev 2015; 26:405-13. [DOI: 10.1016/j.cytogfr.2015.04.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2015] [Accepted: 04/27/2015] [Indexed: 12/15/2022]
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38
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Deacetylation of HSPA5 by HDAC6 leads to GP78-mediated HSPA5 ubiquitination at K447 and suppresses metastasis of breast cancer. Oncogene 2015; 35:1517-28. [PMID: 26119938 DOI: 10.1038/onc.2015.214] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 04/09/2015] [Accepted: 04/26/2015] [Indexed: 12/21/2022]
Abstract
Heat-shock protein 5 (HSPA5) is a marker for poor prognosis in breast cancer patients and has an important role in cancer progression, including promoting drug resistance and metastasis. In this study, we identify that the specific lysine residue 447 (K447) of HSPA5 could be modified with polyubiquitin for subsequent degradation through the ubiquitin proteasomal system, leading to the suppression of cell migration and invasion of breast cancer. We further found that GP78, an E3 ubiquitin ligase, interacted with the C-terminal region of HSPA5 and mediated HSPA5 ubiquitination and degradation. Knock down of GP78 significantly increased the expression of HSPA5 and enhanced migration/invasive ability of breast cancer cells. Knock down of histone deacetylase-6 (HDAC6) increased the acetylation of HSPA5 at lysine residues 353 (K353) and reduced GP78-mediated ubiquitination of HSPA5 at K447 and then increased cell migration/invasion. In addition, we demonstrate that E3 ubiquitin ligase GP78 preferentially binds to deacetylated HSPA5. Notably, the expression levels of GP78 inversely correlated with HSPA5 levels in breast cancer patients. Patients with low GP78 expression significantly correlated with invasiveness of breast cancer, advanced tumor stages and poor clinical outcome. Taken together, our results provide new mechanistic insights into the understanding that deacetylation of HSPA5 by HDAC6 facilitates GP78-mediated HSPA5 ubiquitination and suggest that post-translational regulation of HSPA5 protein is critical for HSPA5-mediated metastatic properties of breast cancer.
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Tanaka T, Iino M. Sec8 regulates cytokeratin8 phosphorylation and cell migration by controlling the ERK and p38 MAPK signalling pathways. Cell Signal 2015; 27:1110-9. [DOI: 10.1016/j.cellsig.2015.02.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Revised: 02/02/2015] [Accepted: 02/16/2015] [Indexed: 12/15/2022]
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40
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Abstract
The Janus tyrosine kinases JAK1-3 and tyrosine kinase-2 (TYK2) are frequently hyperactivated in tumors. In lung cancers JAK1 and JAK2 induce oncogenic signaling through STAT3. A putative role of TYK2 in these tumors has not been reported. Here, we show a previously not recognized TYK2-STAT3 signaling node in lung cancer cells. We reveal that the E3 ubiquitin ligase seven-in-absentia-2 (SIAH2) accelerates the proteasomal degradation of TYK2. This mechanism consequently suppresses the activation of STAT3. In agreement with these data the analysis of primary non-small-cell lung cancer (NSCLC) samples from three patient cohorts revealed that compared to lung adenocarcinoma (ADC), lung squamous cell carcinoma (SCC) show significantly higher levels of SIAH2 and reduced STAT3 phosphorylation levels. Thus, SIAH2 is a novel molecular marker for SCC. We further demonstrate that an activation of the oncologically relevant transcription factor p53 in lung cancer cells induces SIAH2, depletes TYK2, and abrogates the tyrosine phosphorylation of STAT1 and STAT3. This mechanism appears to be different from the inhibition of phosphorylated JAKs through the suppressor of cytokine signaling (SOCS) proteins. Our study may help to identify molecular mechanisms affecting lung carcinogenesis and potential therapeutic targets.
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Ma B, Chen Y, Chen L, Cheng H, Mu C, Li J, Gao R, Zhou C, Cao L, Liu J, Zhu Y, Chen Q, Wu S. Hypoxia regulates Hippo signalling through the SIAH2 ubiquitin E3 ligase. Nat Cell Biol 2014; 17:95-103. [DOI: 10.1038/ncb3073] [Citation(s) in RCA: 161] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 10/24/2014] [Indexed: 12/15/2022]
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Gopalsamy A, Hagen T, Swaminathan K. Investigating the molecular basis of Siah1 and Siah2 E3 ubiquitin ligase substrate specificity. PLoS One 2014; 9:e106547. [PMID: 25202994 PMCID: PMC4159269 DOI: 10.1371/journal.pone.0106547] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 08/07/2014] [Indexed: 11/19/2022] Open
Abstract
The Siah1 and Siah2 E3 ubiquitin ligases play an important role in diverse signaling pathways and have been shown to be deregulated in cancer. The human Siah1 and Siah2 isoforms share high sequence similarity but possess contrary roles in cancer, with Siah1 more often acting as a tumor suppressor while Siah2 functions as a proto-oncogene. The different function of Siah1 and Siah2 in cancer is likely due to the ubiquitination of distinct substrates. Hence, we decided to investigate the molecular basis of the substrate specificity, utilizing the well-characterized Siah2 substrate PHD3. Using chimeric and mutational approaches, we identified critical residues in Siah2 that promote substrate specificity. Thus, we have found that four residues in the N-terminal region of the Siah2 substrate binding domain (SBD) (Ser132, His150, Pro155, Tyr163) are critical for substrate specificity. In the C-terminal region of the SBD, a single residue, Leu250, was identified to promote the specific binding of Siah2 SBD to PHD3. Our study may help to overcome the challenges in the identification of Siah2 specific inhibitors.
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Affiliation(s)
- Anupriya Gopalsamy
- Department of Obstetrics and Gynecology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Thilo Hagen
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
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Kang N, Won M, Rhee M, Ro H. Siah ubiquitin ligases modulate nodal signaling during zebrafish embryonic development. Mol Cells 2014; 37:389-98. [PMID: 24823357 PMCID: PMC4044310 DOI: 10.14348/molcells.2014.0032] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 03/27/2014] [Accepted: 03/31/2014] [Indexed: 01/15/2023] Open
Abstract
Siah2 is a zebrafish homologue of mammalian Siah family. Siah acts as an E3 ubiquitin ligase that binds proteins destined for degradation. Extensive homology between siah and Drosophila Siah homologue (sina) suggests their important physiological roles during embryonic development. However, detailed functional studies of Siah in vertebrate development have not been carried out. Here we report that Siah2 specifically augments nodal related gene expression in marginal blastomeres at late blastula through early gastrula stages of zebrafish embryos. Siah2 dependent Nodal signaling augmentation is confirmed by cell-based reporter gene assays using 293T cells and 3TPluciferase reporter plasmid. We also established a molecular hierarchy of Siah as a upstream regulator of FoxH1/Fast1 transcriptional factor in Nodal signaling. Elevated expression of nodal related genes by overexpression of Siah2 was enough to override the inhibitory effects of atv and lft2 on the Nodal signaling. In particular, E3 ubiquitin ligase activity of Siah2 is critical to limit the duration and/or magnitude of Nodal signaling. Additionally, since the embryos injected with Siah morpholinos mimicked the atv overexpression phenotype at least in part, our data support a model in which Siah is involved in mesendoderm patterning via modulating Nodal signaling.
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Affiliation(s)
- Nami Kang
- Department of Biological Sciences, College of Bioscience and Biotechnology, Chungnam National University, Daejeon 305-764,
Korea
| | - Minho Won
- Program in Genomics of Differentiation, Eunice Kennedy Shiver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland,
USA
| | - Myungchull Rhee
- Department of Biological Sciences, College of Bioscience and Biotechnology, Chungnam National University, Daejeon 305-764,
Korea
| | - Hyunju Ro
- Department of Biological Sciences, College of Bioscience and Biotechnology, Chungnam National University, Daejeon 305-764,
Korea
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Sariyar M, Hoffmann I, Binder H. Combining techniques for screening and evaluating interaction terms on high-dimensional time-to-event data. BMC Bioinformatics 2014; 15:58. [PMID: 24571520 PMCID: PMC3945780 DOI: 10.1186/1471-2105-15-58] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Accepted: 01/28/2014] [Indexed: 11/23/2022] Open
Abstract
Background Molecular data, e.g. arising from microarray technology, is often used for predicting survival probabilities of patients. For multivariate risk prediction models on such high-dimensional data, there are established techniques that combine parameter estimation and variable selection. One big challenge is to incorporate interactions into such prediction models. In this feasibility study, we present building blocks for evaluating and incorporating interactions terms in high-dimensional time-to-event settings, especially for settings in which it is computationally too expensive to check all possible interactions. Results We use a boosting technique for estimation of effects and the following building blocks for pre-selecting interactions: (1) resampling, (2) random forests and (3) orthogonalization as a data pre-processing step. In a simulation study, the strategy that uses all building blocks is able to detect true main effects and interactions with high sensitivity in different kinds of scenarios. The main challenge are interactions composed of variables that do not represent main effects, but our findings are also promising in this regard. Results on real world data illustrate that effect sizes of interactions frequently may not be large enough to improve prediction performance, even though the interactions are potentially of biological relevance. Conclusion Screening interactions through random forests is feasible and useful, when one is interested in finding relevant two-way interactions. The other building blocks also contribute considerably to an enhanced pre-selection of interactions. We determined the limits of interaction detection in terms of necessary effect sizes. Our study emphasizes the importance of making full use of existing methods in addition to establishing new ones.
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Affiliation(s)
- Murat Sariyar
- Institute of Medical Biostatistics, Epidemiology and Informatics, Medical Center of the Johannes Gutenberg University, Mainz 55131, Germany.
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Rimsa V, Eadsforth TC, Hunter WN. Two high-resolution structures of the human E3 ubiquitin ligase Siah1. Acta Crystallogr Sect F Struct Biol Cryst Commun 2013; 69:1339-43. [PMID: 24316825 PMCID: PMC3855715 DOI: 10.1107/s1744309113031448] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 11/18/2013] [Indexed: 01/07/2023]
Abstract
Siah1 is an E3 ubiquitin ligase that contributes to proteasome-mediated degradation of multiple targets in key cellular processes and which shows promise as a therapeutic target in oncology. Structures of a truncated Siah1 bound to peptide-based inhibitors have been reported. Here, new crystallization conditions have allowed the determination of a construct encompassing dual zinc-finger subdomains and substrate-binding domains at significantly higher resolution. Although the crystals appear isomorphous, two structures present distinct states in which the spatial orientation of one zinc-finger subdomain differs with respect to the rest of the dimeric protein. Such a difference, which is indicative of conformational freedom, infers potential biological relevance related to recognition of binding partners. The crystallization conditions and improved models of Siah1 may aid future studies investigating Siah1-ligand complexes.
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Affiliation(s)
- Vadim Rimsa
- Division of Biological Chemistry and Drug Discovery, College of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland
| | - Thomas C. Eadsforth
- Division of Biological Chemistry and Drug Discovery, College of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland
| | - William N. Hunter
- Division of Biological Chemistry and Drug Discovery, College of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland
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