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Huang A, Binmahfouz L, Hancock DP, Anderson PH, Ward DT, Conigrave AD. Calcium-Sensing Receptors Control CYP27B1-Luciferase Expression: Transcriptional and Posttranscriptional Mechanisms. J Endocr Soc 2021; 5:bvab057. [PMID: 34337274 PMCID: PMC8317635 DOI: 10.1210/jendso/bvab057] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Indexed: 12/19/2022] Open
Abstract
25-hydroxyvitamin D 1α-hydroxylase (encoded by CYP27B1), which catalyzes the synthesis of 1,25-dihydroxyvitamin D3, is subject to negative or positive modulation by extracellular Ca2+ (Ca2+o) depending on the tissue. However, the Ca2+ sensors and underlying mechanisms are unidentified. We tested whether calcium-sensing receptors (CaSRs) mediate Ca2+o-dependent control of 1α-hydroxylase using HEK-293 cells stably expressing the CaSR (HEK-CaSR cells). In HEK-CaSR cells, but not control HEK-293 cells, cotransfected with reporter genes for CYP27B1-Photinus pyralis (firefly) luciferase and control Renilla luciferase, an increase in Ca2+o from 0.5mM to 3.0mM induced a 2- to 3-fold increase in firefly luciferase activity as well as mRNA and protein levels. Surprisingly, firefly luciferase was specifically suppressed at Ca2+o ≥ 5.0mM, demonstrating biphasic Ca2+o control. Both phases were mediated by CaSRs as revealed by positive and negative modulators. However, Ca2+o induced simple monotonic increases in firefly luciferase and endogenous CYP27B1 mRNA levels, indicating that the inhibitory effect of high Ca2+o was posttranscriptional. Studies with inhibitors and the CaSR C-terminal mutant T888A identified roles for protein kinase C (PKC), phosphorylation of T888, and extracellular regulated protein kinase (ERK)1/2 in high Ca2+o-dependent suppression of firefly luciferase. Blockade of both PKC and ERK1/2 abolished Ca2+o-stimulated firefly luciferase, demonstrating that either PKC or ERK1/2 is sufficient to stimulate the CYP27B1 promoter. A key CCAAT box (−74 bp to −68 bp), which is regulated downstream of PKC and ERK1/2, was required for both basal transcription and Ca2+o-mediated transcriptional upregulation. The CaSR mediates Ca2+o-dependent transcriptional upregulation of 1α-hydroxylase and an additional CaSR-mediated mechanism is identified by which Ca2+o can promote luciferase and possibly 1α-hydroxylase breakdown.
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Affiliation(s)
- Alice Huang
- School of Life and Environmental Sciences, Charles Perkins Centre (D17), University of Sydney, NSW 2006Australia
| | - Lenah Binmahfouz
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester M13 9PT, UK.,Department of Pharmacology and Toxicology, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Dale P Hancock
- School of Life and Environmental Sciences, Charles Perkins Centre (D17), University of Sydney, NSW 2006Australia
| | - Paul H Anderson
- Clinical and Health Sciences, Health and Biomedical Innovation, University of South Australia, Adelaide, SA, 5001, Australia
| | - Donald T Ward
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester M13 9PT, UK
| | - Arthur D Conigrave
- School of Life and Environmental Sciences, Charles Perkins Centre (D17), University of Sydney, NSW 2006Australia
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2
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Li Z, Yu L, Hu B, Chen L, Jv M, Wang L, Zhou C, Wei M, Zhao L. Advances in cancer treatment: a new therapeutic target, Annexin A2. J Cancer 2021; 12:3587-3596. [PMID: 33995636 PMCID: PMC8120175 DOI: 10.7150/jca.55173] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 02/25/2021] [Indexed: 12/11/2022] Open
Abstract
Annexin A2 (ANXA2) is a calcium regulated phospholipid-binding protein. It is expressed in some tumor cells, endothelial cells, macrophages, and mononuclear cells, affecting cell survival and mediating interactions between intercellular and extracellular microenvironment. Aberrant expression of ANXA2 can be used as a potential predictive factor, diagnostic biomarker and therapeutic target in cancer therapy. Investigators used various technologies to target ANXA2 in a preclinical model of human cancers and demonstrated encouraging results. In this review article, we discuss the diagnosis and prognosis latent capacity of ANXA2 in progressive cancers, focus on the exploration of restorative interventions targeting ANXA2 in cancer treatment. Further, we comment on a promising candidate therapy that is conceivable for clinical translation.
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Affiliation(s)
- Zinan Li
- Department of Pharmacology, School of Pharmacy, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China.,Liaoning Engineering Technology Research Center, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China
| | - Lifeng Yu
- Department of Pharmacology, School of Pharmacy, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China.,Liaoning Engineering Technology Research Center, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China
| | - Baohui Hu
- Department of Pharmacology, School of Pharmacy, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China.,Liaoning Engineering Technology Research Center, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China
| | - Lianze Chen
- Department of Pharmacology, School of Pharmacy, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China.,Liaoning Engineering Technology Research Center, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China
| | - Mingyi Jv
- Department of Pharmacology, School of Pharmacy, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China.,Liaoning Engineering Technology Research Center, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China
| | - Lin Wang
- Department of Pharmacology, School of Pharmacy, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China.,Liaoning Engineering Technology Research Center, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China
| | - Chenyi Zhou
- Department of Pharmacology, School of Pharmacy, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China.,Liaoning Engineering Technology Research Center, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China
| | - Minjie Wei
- Department of Pharmacology, School of Pharmacy, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China.,Liaoning Engineering Technology Research Center, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China.,Liaoning Medical Diagnosis and Treatment Center, Liaoning Province, China
| | - Lin Zhao
- Department of Pharmacology, School of Pharmacy, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China.,Liaoning Engineering Technology Research Center, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang City, 110122, Liaoning, China
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3
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Involvement of Annexin A2 Expression and Apoptosis in Reverse Polarization of Invasive Micropapillary Carcinoma of the Breast. Case Rep Pathol 2020; 2020:9242305. [PMID: 32695546 PMCID: PMC7368959 DOI: 10.1155/2020/9242305] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 06/17/2020] [Accepted: 06/30/2020] [Indexed: 01/10/2023] Open
Abstract
Invasive micropapillary carcinoma (IMPC) is characterized by pseudopapillary tumor-cell clusters with a reverse polarity (RP) floating in lacunar spaces, with aggressive biological characteristics. The RP prevention is considered to inhibit IMPC, but its pathogenic mechanisms remain unclear. Annexin A2 (ANX A2), a cell-polarity protein, is known to be involved in lumenogenesis. ANX A2 expression is immunohistochemically examined, as well as both epithelial membrane antigen (EMA) and mucin-1 glycoprotein (MUC-1), the gold-standard markers for luminal differentiation, in the background tumor components of a case of IMPC. The following findings were noticed: (1) Apoptosis was scattered with peripheral apoptotic vacuolar change; (2) EMA and MUC-1 expressions were found, rimming the peripheral apoptotic vacuoles (including the contact surface with neighboring tumor cells), and these positions corresponded to the ones with a distinct ANX A2 positivity; and (3) partially detached tumor cells showed distinct positivity of three proteins at the stroma-facing surface, which is consistent with a RP. Taken together, frequent apoptosis in tumor cells with membranous accumulation of ANX A2 is considered to be indispensable for the reverse polarization of IMPC, and that secondary necrosis following apoptosis induces the cell-polarity disorder and creates detached tumor cells with a RP.
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4
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Crochemore C, Fernández-Molina C, Montagne B, Salles A, Ricchetti M. CSB promoter downregulation via histone H3 hypoacetylation is an early determinant of replicative senescence. Nat Commun 2019; 10:5576. [PMID: 31811121 PMCID: PMC6898346 DOI: 10.1038/s41467-019-13314-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 10/22/2019] [Indexed: 01/03/2023] Open
Abstract
Cellular senescence has causative links with ageing and age-related diseases, however, it remains unclear if progeroid factors cause senescence in normal cells. Here, we show that depletion of CSB, a protein mutated in progeroid Cockayne syndrome (CS), is the earliest known trigger of p21-dependent replicative senescence. CSB depletion promotes overexpression of the HTRA3 protease resulting in mitochondrial impairments, which are causally linked to CS pathological phenotypes. The CSB promoter is downregulated by histone H3 hypoacetylation during DNA damage-response. Mechanistically, CSB binds to the p21 promoter thereby downregulating its transcription and blocking replicative senescence in a p53-independent manner. This activity of CSB is independent of its role in the repair of UV-induced DNA damage. HTRA3 accumulation and senescence are partially rescued upon reduction of oxidative/nitrosative stress. These findings establish a CSB/p21 axis that acts as a barrier to replicative senescence, and link a progeroid factor with the process of regular ageing in human. Senescence of metabolically active cells is a process linked to ageing. Here the authors reveal that CSB is required to block replicative senescence, and epigenetic control of CSB downregulation triggers proliferative arrest in a p21-dependent manner.
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Affiliation(s)
- Clément Crochemore
- Institut Pasteur, Stem Cells and Development, Department of Developmental and Stem Cell Biology, 75015, Paris, France.,CNRS UMR 3738, Team Stability of Nuclear and Mitochondrial DNA, 75015, Paris, France
| | - Cristina Fernández-Molina
- Institut Pasteur, Stem Cells and Development, Department of Developmental and Stem Cell Biology, 75015, Paris, France.,CNRS UMR 3738, Team Stability of Nuclear and Mitochondrial DNA, 75015, Paris, France.,Sorbonne Universités, UPMC, University of Paris 06, IFD-ED 515, Paris, France
| | - Benjamin Montagne
- Institut Pasteur, Stem Cells and Development, Department of Developmental and Stem Cell Biology, 75015, Paris, France.,CNRS UMR 3738, Team Stability of Nuclear and Mitochondrial DNA, 75015, Paris, France
| | - Audrey Salles
- Institut Pasteur, UTechS Photonic BioImaging PBI (Imagopole), Centre de Recherche et de Ressources Technologiques C2RT, Paris, France
| | - Miria Ricchetti
- Institut Pasteur, Stem Cells and Development, Department of Developmental and Stem Cell Biology, 75015, Paris, France. .,CNRS UMR 3738, Team Stability of Nuclear and Mitochondrial DNA, 75015, Paris, France.
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5
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Wenta T, Rychlowski M, Jarzab M, Lipinska B. HtrA4 Protease Promotes Chemotherapeutic-Dependent Cancer Cell Death. Cells 2019; 8:cells8101112. [PMID: 31546993 PMCID: PMC6829446 DOI: 10.3390/cells8101112] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 09/12/2019] [Accepted: 09/18/2019] [Indexed: 12/26/2022] Open
Abstract
The HtrA4 human protease is crucial in placentation and embryo implantation, and its altered level is connected with pre-eclampsia. The meta-analyses of microarray assays revealed that the HtrA4 level is changed in brain tumors and breast and prostate cancers, which suggests its involvement in oncogenesis. In spite of the HtrA4 involvement in important physiological and pathological processes, its function in the cell is poorly understood. In this work, using lung and breast cancer cell lines, we showed for the first time that the full-length HtrA4 and its N-terminally deleted variant promote cancer cell death induced by chemotherapeutic drugs by enhancing apoptosis. The effect is dependent on the HtrA4 proteolytic activity, and the N-terminally deleted HtrA4 is more efficient in the cell death stimulation. Furthermore, HtrA4 increases the effect of chemotherapeutics on the clonogenic potential and motility of cancer cells, and it increases cell cycle arrest at the G2/M phase. HtrA4 may modulate cell death by degrading the anti-apoptotic XIAP protein and also by proteolysis of the executioner pro-caspase 7 and cytoskeletal proteins, actin and β-tubulin. These findings provide new insight into the mechanism of the HtrA4 protease function in cell death and oncogenesis, and they may help to develop new anti-cancer therapeutic strategies.
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Affiliation(s)
- Tomasz Wenta
- Department of General and Medical Biochemistry, Faculty of Biology, University of Gdansk, Wita Stwosza 59, 80-308 Gdansk, Poland.
| | - Michal Rychlowski
- Laboratory of Virus Molecular Biology, Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Abrahama 58, 80-307 Gdansk, Poland.
| | - Miroslaw Jarzab
- Department of General and Medical Biochemistry, Faculty of Biology, University of Gdansk, Wita Stwosza 59, 80-308 Gdansk, Poland.
| | - Barbara Lipinska
- Department of General and Medical Biochemistry, Faculty of Biology, University of Gdansk, Wita Stwosza 59, 80-308 Gdansk, Poland.
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6
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He H, Xiao L, Cheng S, Yang Q, Li J, Hou Y, Song F, Su X, Jin H, Liu Z, Dong J, Zuo R, Song X, Wang Y, Zhang K, Duan W, Hou Y. Annexin A2 Enhances the Progression of Colorectal Cancer and Hepatocarcinoma via Cytoskeleton Structural Rearrangements. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2019; 25:950-960. [PMID: 31172894 DOI: 10.1017/s1431927619000679] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Annexin A2 (ANXA2) is reported to be associated with cancer development. To investigate the roles ANXA2 plays during the development of cancer, the RNAi method was used to inhibit the ANXA2 expression in caco2 (human colorectal cancer cell line) and SMMC7721 (human hepatocarcinoma cell line) cells. The results showed that when the expression of ANXA2 was efficiently inhibited, the growth and motility of both cell lines were significantly decreased, and the development of the motility relevant microstructures, such as pseudopodia, filopodia, and the polymerization of microfilaments and microtubules were obviously inhibited. The cancer cell apoptosis was enhanced without obvious significance. The possible regulating pathway in the process was also predicted and discussed. Our results suggested that ANXA2 plays important roles in maintaining the malignancy of colorectal and hepatic cancer by enhancing the cell proliferation, motility, and development of the motility associated microstructures of cancer cells based on a possible complicated signal pathway.
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Affiliation(s)
- Huimin He
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
| | - Li Xiao
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
| | - Sinan Cheng
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
| | - Qian Yang
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
| | - Jinmei Li
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
| | - Yifan Hou
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
| | - Fengying Song
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
| | - Xiaorong Su
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
| | - Huijuan Jin
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
| | - Zheng Liu
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
| | - Jing Dong
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
| | - Ruiye Zuo
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
| | - Xigui Song
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
| | - Yanyan Wang
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
| | - Kun Zhang
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
| | - Wei Duan
- School of Medicine, Deakin University,Waurn Ponds, VIC 3216,Australia
| | - Yingchun Hou
- Department of Cell Biology,College of Life Sciences, Shaanxi Normal University,620 West Chang-An Ave, Xi'an, Shaanxi 710119,China
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7
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Němcová-Fürstová V, Balušíková K, Halada P, Pavlíková N, Šrámek J, Kovář J. Stearate-Induced Apoptosis in Human Pancreatic β-Cells is Associated with Changes in Membrane Protein Expression and These Changes are Inhibited by Oleate. Proteomics Clin Appl 2019; 13:e1800104. [PMID: 30666801 DOI: 10.1002/prca.201800104] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 12/12/2018] [Indexed: 12/25/2022]
Abstract
PURPOSE Lipotoxicity is implicated in type 2 diabetes pathogenesis. Its molecular mechanisms are not completely understood. The aim of this study is to identify new suspect proteins involved in pancreatic β-cell death induction by saturated fatty acids and its inhibition by unsaturated fatty acids. EXPERIMENTAL DESIGN Employing 2DE analysis and subsequent western blot confirmation, the differences in membrane/membrane-associated protein expression in human β-cell line NES2Y are assessed during cell death induction by stearate and its inhibition by oleate. RESULTS Induction of apoptosis by stearate is associated with significantly increased levels of Hsp90β, peroxiredoxin-1, and 14-3-3γ in the membrane fraction of NES2Y cells and significantly decreased levels of annexin A2, annexin A4, and reticulocalbin-2. All these changes are significantly inhibited by oleate co-application. No expression changes are detected after application of stearate together with oleate. Furthermore, the expression of reticulocalbin-2 is significantly decreased after stearate application also in the whole cell lysate. CONCLUSIONS AND CLINICAL RELEVANCE Several membrane-associated proteins that could be related to pro- and anti-apoptotic signaling initiated by fatty acids in human pancreatic β-cells are identified. As far as we know, annexin A4, reticulocalbin-2, and 14-3-3γ represent novel molecules related to the effect of fatty acids on β-cell viability.
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Affiliation(s)
- Vlasta Němcová-Fürstová
- Department of Biochemistry, Cell and Molecular Biology & Center for Research of Diabetes, Metabolism and Nutrition, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Kamila Balušíková
- Department of Biochemistry, Cell and Molecular Biology & Center for Research of Diabetes, Metabolism and Nutrition, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Petr Halada
- Laboratory of Molecular Structure Characterization, Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Nela Pavlíková
- Department of Biochemistry, Cell and Molecular Biology & Center for Research of Diabetes, Metabolism and Nutrition, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Jan Šrámek
- Department of Biochemistry, Cell and Molecular Biology & Center for Research of Diabetes, Metabolism and Nutrition, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Jan Kovář
- Department of Biochemistry, Cell and Molecular Biology & Center for Research of Diabetes, Metabolism and Nutrition, Third Faculty of Medicine, Charles University, Prague, Czech Republic
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8
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Narla G, Sangodkar J, Ryder CB. The impact of phosphatases on proliferative and survival signaling in cancer. Cell Mol Life Sci 2018; 75:2695-2718. [PMID: 29725697 PMCID: PMC6023766 DOI: 10.1007/s00018-018-2826-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Revised: 03/24/2018] [Accepted: 04/23/2018] [Indexed: 02/06/2023]
Abstract
The dynamic and stringent coordination of kinase and phosphatase activity controls a myriad of physiologic processes. Aberrations that disrupt the balance of this interplay represent the basis of numerous diseases. For a variety of reasons, early work in this area portrayed kinases as the dominant actors in these signaling events with phosphatases playing a secondary role. In oncology, these efforts led to breakthroughs that have dramatically altered the course of certain diseases and directed vast resources toward the development of additional kinase-targeted therapies. Yet, more recent scientific efforts have demonstrated a prominent and sometimes driving role for phosphatases across numerous malignancies. This maturation of the phosphatase field has brought with it the promise of further therapeutic advances in the field of oncology. In this review, we discuss the role of phosphatases in the regulation of cellular proliferation and survival signaling using the examples of the MAPK and PI3K/AKT pathways, c-Myc and the apoptosis machinery. Emphasis is placed on instances where these signaling networks are perturbed by dysregulation of specific phosphatases to favor growth and persistence of human cancer.
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Affiliation(s)
| | - Jaya Sangodkar
- Icahn School of Medicine at Mount Sinai, New York, NY, USA
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9
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Annexin A2 overexpression associates with colorectal cancer invasiveness and TGF-ß induced epithelial mesenchymal transition via Src/ANXA2/STAT3. Sci Rep 2018; 8:11285. [PMID: 30050103 PMCID: PMC6062537 DOI: 10.1038/s41598-018-29703-0] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 07/16/2018] [Indexed: 01/06/2023] Open
Abstract
Annexin A2 (ANXA2) is upregulated in several malignancies, including colorectal cancer (CRC). However, there is little knowledge on the molecular mechanisms involved to its upregulation. The aim of this study was to identify the mechanism through which ANXA2 overexpression leads to CRC progression and evaluate its potential prognostic value. We used human CRC samples to analyse the correlation between ANXA2 levels and tumour staging. ANXA2 expression was increased in CRC tissues compared to normal colon tissues. In addition, we observe increased ANXA2 levels in stage IV tumours and metastasis, when compared to stage I-III. Whereas E-cadherin, an epithelial marker, decreased in stage II-IV and increased in metastasis. We’ve also shown that TGF-β, a classic EMT inductor, caused upregulation of ANXA2, and internalization of both E-cadherin and ANXA2 in CRC cells. ANXA2 silencing hindered TGF-β-induced invasiveness, and inhibitors of the Src/ANXA2/STAT3 pathway reversed the EMT. In silico analysis confirmed overexpression of ANXA2 and association to the consensus moleculars subtypes (CMS) with the worst prognosis. Therefore, ANXA2 overexpression play a pivotal role in CRC invasiveness through Src/ANXA2/STAT3 pathway activation. The association of ANXA2 to distinct CMSs suggests the possible use of ANXA2 as a prognostic marker or directed target therapy.
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10
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Pérez-Sánchez G, Jiménez A, Quezada-Ramírez MA, Estudillo E, Ayala-Sarmiento AE, Mendoza-Hernández G, Hernández-Soto J, Hernández-Hernández FC, Cázares-Raga FE, Segovia J. Annexin A1, Annexin A2, and Dyrk 1B are upregulated during GAS1-induced cell cycle arrest. J Cell Physiol 2018; 233:4166-4182. [PMID: 29030970 DOI: 10.1002/jcp.26226] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Accepted: 10/03/2017] [Indexed: 12/18/2022]
Abstract
GAS1 is a pleiotropic protein that has been investigated because of its ability to induce cell proliferation, cell arrest, and apoptosis, depending on the cellular or the physiological context in which it is expressed. At this point, we have information about the molecular mechanisms by which GAS1 induces proliferation and apoptosis; but very few studies have been focused on elucidating the mechanisms by which GAS1 induces cell arrest. With the aim of expanding our knowledge on this subject, we first focused our research on finding proteins that were preferentially expressed in cells arrested by serum deprivation. By using a proteomics approach and mass spectrometry analysis, we identified 17 proteins in the 2-DE protein profile of serum deprived NIH3T3 cells. Among them, Annexin A1 (Anxa1), Annexin A2 (Anxa2), dual specificity tyrosine-phosphorylation-regulated kinase 1B (Dyrk1B), and Eukaryotic translation initiation factor 3, F (eIf3f) were upregulated at transcriptional the level in proliferative NIH3T3 cells. Moreover, we demonstrated that Anxa1, Anxa2, and Dyrk1b are upregulated at both the transcriptional and translational levels by the overexpression of GAS1. Thus, our results suggest that the upregulation of Anxa1, Anxa2, and Dyrk1b could be related to the ability of GAS1 to induce cell arrest and maintain cell viability. Finally, we provided further evidence showing that GAS1 through Dyrk 1B leads not only to the arrest of NIH3T3 cells but also maintains cell viability.
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Affiliation(s)
- Gilberto Pérez-Sánchez
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | - Adriana Jiménez
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | - Marco A Quezada-Ramírez
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | - Enrique Estudillo
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | - Alberto E Ayala-Sarmiento
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | | | - Justino Hernández-Soto
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | - Fidel C Hernández-Hernández
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | - Febe E Cázares-Raga
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | - Jose Segovia
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
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11
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Feng X, Liu H, Zhang Z, Gu Y, Qiu H, He Z. Annexin A2 contributes to cisplatin resistance by activation of JNK-p53 pathway in non-small cell lung cancer cells. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2017; 36:123. [PMID: 28886730 PMCID: PMC5591524 DOI: 10.1186/s13046-017-0594-1] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 09/04/2017] [Indexed: 12/13/2022]
Abstract
BACKGROUND Development of resistance to therapy continues to be a serious clinical problem in lung cancer management. We previously identified that Annexin A2 is significantly up-regulated in cisplatin-resistant non-small cell lung cancer (NSCLC) A549/DDP cells. However, the exact function and molecular mechanism of Annexin A2 in cisplatin resistance of NSCLCs has not been determined. METHODS Western blot and qRT-PCR were performed to analyze the protein and mRNA level of indicated molecules, respectively. Immunohistochemistry was performed to analyze the expression of Annexin A2 in NSCLC tissue samples. MTS assay, Colony formation assays, AnnexinV/PI apoptosis assay, Luciferase Reporter Assay, Chromatin-immunoprecipitation, and nude mice xenograft assay were used to visualize the function of Annexin A2 on cisplatin resistance. RESULTS Our results demonstrated that knockdown of Annexin A2 increased cisplatin sensitivity of cisplatin-resistant A549/DDP cells both in vitro and in vivo, whereas overexpression of Annexin A2 increased cisplatin resistance of A549, H460 and H1650 cells. Moreover, we found that Annexin A2 enhanced cisplatin resistance via inhibition of cisplatin-induced cell apoptosis. Our studies showed that Annexin A2 suppressed the expression of p53 through activation of JNK/c-Jun signaling, which in turn resulted in a decrease in the expression of p53-regulated apoptotic genes p21, GADD45 and BAX, as well as p53-dependent cell apoptosis. Furthermore, we found that in NSCLC cases that Annexin A2 is highly expressed; it is positively correlated with a poor prognosis, as well as correlated with short disease-free survival for patients who received chemotherapy after surgery. CONCLUSIONS These data suggested that Annexin A2 induces cisplatin resistance of NSCLCs via regulation of JNK/c-Jun/p53 signaling, and provided an evidence that blockade of Annexin A2 could serve as a novel therapeutic approach for overcoming drug resistance in NSCLCs.
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Affiliation(s)
- Xiaomin Feng
- Cancer Hospital and Cancer Research Institute, Guangzhou Medical University, Guangzhou, No.78 hengzhigang Road, Guangzhou, 510095, People's Republic of China
| | - Hao Liu
- Cancer Hospital and Cancer Research Institute, Guangzhou Medical University, Guangzhou, No.78 hengzhigang Road, Guangzhou, 510095, People's Republic of China
| | - Zhijie Zhang
- Cancer Hospital and Cancer Research Institute, Guangzhou Medical University, Guangzhou, No.78 hengzhigang Road, Guangzhou, 510095, People's Republic of China
| | - Yixue Gu
- Cancer Hospital and Cancer Research Institute, Guangzhou Medical University, Guangzhou, No.78 hengzhigang Road, Guangzhou, 510095, People's Republic of China
| | - Huisi Qiu
- Cancer Hospital and Cancer Research Institute, Guangzhou Medical University, Guangzhou, No.78 hengzhigang Road, Guangzhou, 510095, People's Republic of China
| | - Zhimin He
- Cancer Hospital and Cancer Research Institute, Guangzhou Medical University, Guangzhou, No.78 hengzhigang Road, Guangzhou, 510095, People's Republic of China.
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Ding Y, Wang B, Chen X, Zhou Y, Ge J. Staurosporine suppresses survival of HepG2 cancer cells through Omi/HtrA2-mediated inhibition of PI3K/Akt signaling pathway. Tumour Biol 2017; 39:1010428317694317. [PMID: 28349827 DOI: 10.1177/1010428317694317] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Staurosporine, which is an inhibitor of a broad spectrum of protein kinases, has shown cytotoxicity on several human cancer cells. However, the underlying mechanism is not well understood. In this study, we examined whether and how this compound has an inhibitory action on phosphatidylinositol 3-kinase (PI3K)/Akt pathway in vitro using HepG2 human hepatocellular carcinoma cell line. Cell viability and apoptosis were determined using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and terminal deoxyribonucleotidyl transferase–mediated dUTP-digoxigenin nick end labeling (TUNEL) assay, respectively. Glutathione S-transferase (GST) pull-down assay and co-immunoprecipitation were performed to detect protein–protein interactions. Small interfering RNA (siRNA) was used to silence the expression of targeted protein. We found that staurosporine significantly decreased cell viability and increased cell apoptosis in a concentration- and time-dependent manner in HepG2 cancer cells, along with the decreased expressions of PDK1 protein and Akt phosphorylation. Staurosporine was also found to enhance Omi/HtrA2 release from mitochondria. Furthermore, Omi/HtrA2 directly bound to PDK1. Pharmacological and genetic inhibition of Omi/HtrA2 restored protein levels of PDK1 and protected HepG2 cancer cells from staurosporine-induced cell death. In addition, staurosporine was found to activate autophagy. However, inhibition of autophagy exacerbated cell death under concomitant treatment with staurosporine. Taken together, our results indicate that staurosporine induced cytotoxicity response by inhibiting PI3K/Akt signaling pathway through Omi/HtrA2-mediated PDK1 degradation, and the process provides a novel mechanism by which staurosporine produces its therapeutic effects.
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Affiliation(s)
- Youming Ding
- Department of Hepatobiliary & Laparoscopic Surgery, Wuhan University Renmin Hospital, Wuhan, China
| | - Bin Wang
- Department of Hepatobiliary & Laparoscopic Surgery, Wuhan University Renmin Hospital, Wuhan, China
| | - Xiaoyan Chen
- Department of Hepatobiliary & Laparoscopic Surgery, Wuhan University Renmin Hospital, Wuhan, China
| | - Yu Zhou
- Department of Hepatobiliary & Laparoscopic Surgery, Wuhan University Renmin Hospital, Wuhan, China
| | - Jianhui Ge
- Department of Hepatobiliary & Laparoscopic Surgery, Wuhan University Renmin Hospital, Wuhan, China
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Shi H, Xiao L, Duan W, He H, Ma L, Da M, Duan Y, Wang Q, Wu H, Song X, Hou Y. ANXA2 enhances the progression of hepatocellular carcinoma via remodeling the cell motility associated structures. Micron 2016; 85:26-33. [PMID: 27060670 DOI: 10.1016/j.micron.2016.03.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 03/29/2016] [Accepted: 03/30/2016] [Indexed: 12/22/2022]
Abstract
Hepatocellular carcinoma (HCC) ranks as the fifth most common malignancy worldwide. The detailed mechanism of signal regulation for HCC progression is still not known, and the high motility of cancer cells is known as a core property for cancer progression maintenance. Annexin A2 (ANXA2), a calcium-dependent phospholipids binding protein is highly expressed in HCC. To study the roles the excessively expressed ANXA2 during the progression of HCC, we inhibited the ANXA2 expression in SMMC-7721 cells using RNAi, followed by the analysis of cell growth, apoptosis and cell motility. To explore the relationship between the cell behaviors and its structures, the microstructure changes were observed under fluorescence microscopy, laser scanning confocal microscopy and electron microscopy. Our findings demonstrated that down-regulation of ANXA2 results in decreased the cell proliferation and motility, enhanced apoptosis, suppressed cell pseudopodia/filopodia, inhibited expression of F-actin and β-tubulin, and inhibited or depolymerized Lamin B. The cell contact inhibition was also analyzed in the paper. Take together, our results indicate that ANXA2 plays an important role to enhance the malignant behaviors of HCC cells, and the enhancement is closely based on its remodeling to cell structures.
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Affiliation(s)
- Hongyan Shi
- Co-Innovation Center for Qinba Region's Sustainable Development, Shaanxi Normal University, Xi'an, Shaanxi 710062, China
| | - Li Xiao
- Co-Innovation Center for Qinba Region's Sustainable Development, Shaanxi Normal University, Xi'an, Shaanxi 710062, China
| | - Wei Duan
- School of Medicine, Deakin University, Waurn Ponds, VIC 3216, Australia
| | - Huimin He
- Co-Innovation Center for Qinba Region's Sustainable Development, Shaanxi Normal University, Xi'an, Shaanxi 710062, China
| | - Lele Ma
- Co-Innovation Center for Qinba Region's Sustainable Development, Shaanxi Normal University, Xi'an, Shaanxi 710062, China
| | - Miaomiao Da
- Co-Innovation Center for Qinba Region's Sustainable Development, Shaanxi Normal University, Xi'an, Shaanxi 710062, China
| | - Yan Duan
- Co-Innovation Center for Qinba Region's Sustainable Development, Shaanxi Normal University, Xi'an, Shaanxi 710062, China
| | - Qian Wang
- Co-Innovation Center for Qinba Region's Sustainable Development, Shaanxi Normal University, Xi'an, Shaanxi 710062, China
| | - Huayi Wu
- The High School Affiliated to Shaanxi Normal University, Xi'an, Shaanxi 710061, China
| | - Xigui Song
- The High School Affiliated to Shaanxi Normal University, Xi'an, Shaanxi 710061, China
| | - Yingchun Hou
- Co-Innovation Center for Qinba Region's Sustainable Development, Shaanxi Normal University, Xi'an, Shaanxi 710062, China.
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Jeon YJ, Cho JH, Lee SY, Choi YH, Park H, Jung S, Shim JH, Chae JI. Esculetin Induces Apoptosis Through EGFR/PI3K/Akt Signaling Pathway and Nucleophosmin Relocalization. J Cell Biochem 2015; 117:1210-21. [DOI: 10.1002/jcb.25404] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Accepted: 10/06/2015] [Indexed: 12/20/2022]
Affiliation(s)
- Young-Joo Jeon
- Department of Dental Pharmacology; School of Dentistry; BK21 Plus; Chonbuk National University; Jeonju Republic of Korea
| | - Jin Hyoung Cho
- Department of Dental Pharmacology; School of Dentistry; BK21 Plus; Chonbuk National University; Jeonju Republic of Korea
| | - Seung-Yeop Lee
- Cluster for Craniofacial Development and Regeneration Research; Institute of Oral Biosciences and School of Dentistry; Chonbuk National University; Jeonju South Korea
| | - Yung Hyun Choi
- Department of Biochemistry; Dongeui University College of Oriental Medicine; Busan 614-052 Republic of Korea
| | - Hongju Park
- Department of Oral and Maxillofacial Surgery; School of Dentistry; Chonnam National University; Gwangju Republic of Korea
| | - Seunggon Jung
- Department of Oral and Maxillofacial Surgery; Chonnam National University Hwasun Hospital; Hwasun Jeonnam Republic of Korea
| | - Jung-Hyun Shim
- Natural Medicine Research Institute; Department of Pharmacy; College of Pharmacy; Mokpo National University; Jeonnam 534-729 Republic of Korea
| | - Jung-Il Chae
- Department of Dental Pharmacology; School of Dentistry; BK21 Plus; Chonbuk National University; Jeonju Republic of Korea
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Li DW, Li JH, Wang YD, Li GR. Atorvastatin protects endothelial colony‑forming cells against H2O2‑induced oxidative damage by regulating the expression of annexin A2. Mol Med Rep 2015; 12:7941-8. [PMID: 26497173 PMCID: PMC4758293 DOI: 10.3892/mmr.2015.4440] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 09/10/2015] [Indexed: 12/24/2022] Open
Abstract
Endothelial dysfunction and injury are central events in the pathogenesis of ischemic vascular disorders. Endothelial progenitor cells (EPCs) are mobilized from the bone marrow into the peripheral circulation, where they locate to sites of injured endothelium and are involved in endothelial repair and vascular regeneration. During these processes, EPCs are exposed to oxidative stress, a crucial pathological condition, which occurs during vascular injury and limits the efficacy of EPCs in the repair of injured endothelium. Statins are effective inhibitors of 3-hydroxy-3-methylglutaryl coenzyme A reductase, and are commonly used to manage and prevent ischemic vascular disease by reducing plasma cholesterol levels. In addition to lowering cholesterol, statins have also been reported to exert pleiotropic actions, including anti-inflammatory and anti-oxidative activities. The present study aimed to investigate the ability of atorvastatin to protect endothelial colony-forming cells (ECFCs), a homogeneous subtype of EPCs, from hydrogen peroxide (H2O2)-induced oxidative damage, and to determine the mechanism underlying this protective action. MTT assay, acridine orange/ethidium bromide staining, reactive oxygen species assay, western blot analysis and tube formation assay were employed. The results demonstrated that H2O2 induced cell death and decreased the tube-forming ability of the ECFCs, in a concentration-dependent manner; however, these effects were partially attenuated following administration of atorvastatin. The reversion of the quantitative and qualitative impairment of the H2O2-treated ECFCs appeared to be mediated by the regulation of annexin A2, as the expression levels of annexin A2 were decreased following treatment with H2O2 and increased following treatment with atorvastatin. These results indicated that annexin A2 may be involved in the H2O2-induced damage of ECFCs, and in the protective activities of atorvastatin in response to oxidative stress.
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Affiliation(s)
- Da-Wei Li
- Department of Neurology, Affiliated Hospital of Beihua University, Jilin, Jilin 132000, P.R. China
| | - Ji-Hua Li
- Department of Ultrasonography, The Third Hospital of Jilin University, Changchun, Jilin 130033, P.R. China
| | - Ying-Di Wang
- Department of Urinary Surgery, The Tumor Hospital of Jilin, Changchun, Jilin 130012, P.R. China
| | - Guang-Ren Li
- Department of Neurology, The Third Hospital of Jilin University, Changchun, Jilin 130033, P.R. China
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16
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Miyamoto M, Takano M, Iwaya K, Shinomiya N, Goto T, Kato M, Suzuki A, Aoyama T, Hirata J, Nagaoka I, Tsuda H, Furuya K. High-temperature-required protein A2 as a predictive marker for response to chemotherapy and prognosis in patients with high-grade serous ovarian cancers. Br J Cancer 2015; 112:739-44. [PMID: 25628093 PMCID: PMC4333506 DOI: 10.1038/bjc.2015.1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 11/29/2014] [Accepted: 12/22/2014] [Indexed: 12/11/2022] Open
Abstract
Background: High-temperature-required protein A2 (HtrA2), a protein relating with apoptosis in a caspases-dependent and non-dependent manner, has been reported to be associated with chemosensitivity in several human cancers. Methods: Tissue microarrays made from 142 patients with high-grade serous ovarian adenocarcinoma were evaluated to assess whether HtrA2 expression was related with several clinical parameters. Results: Negative HtrA2 expression was observed in 36 cases (25%) of the patients, and related with significantly lower response rates of primary chemotherapy than those with positive HtrA2 expression (56% vs 83%, P<0.01). In addition, negative HtrA2 expression was identified as an independent worse prognostic factor for progression-free survival and overall survival by multivariate analyses. Furthermore, HtrA2 downregulation modulated sensitivity to platinum in serous ovarian cancer cells in vitro. Conclusions: HtrA2 expression was a predictor for sensitivity to chemotherapy, and could be a candidate of molecular target in the treatment of high-grade serous ovarian cancers.
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Affiliation(s)
- M Miyamoto
- Department of Obstetrics and Gynecology, National Defense Medical College Hospital, Tokorozawa, Saitama 359-8513, Japan
| | - M Takano
- Department of Obstetrics and Gynecology, National Defense Medical College Hospital, Tokorozawa, Saitama 359-8513, Japan
| | - K Iwaya
- Department of Basic Pathology, National Defense Medical College Hospital, Tokorozawa, Saitama 359-8513, Japan
| | - N Shinomiya
- Department of Molecular Biology, National Defense Medical College Hospital, Tokorozawa, Saitama 359-8513, Japan
| | - T Goto
- Department of Obstetrics and Gynecology, National Defense Medical College Hospital, Tokorozawa, Saitama 359-8513, Japan
| | - M Kato
- Department of Obstetrics and Gynecology, National Defense Medical College Hospital, Tokorozawa, Saitama 359-8513, Japan
| | - A Suzuki
- Department of Obstetrics and Gynecology, National Defense Medical College Hospital, Tokorozawa, Saitama 359-8513, Japan
| | - T Aoyama
- Department of Obstetrics and Gynecology, National Defense Medical College Hospital, Tokorozawa, Saitama 359-8513, Japan
| | - J Hirata
- Department of Obstetrics and Gynecology, National Defense Medical College Hospital, Tokorozawa, Saitama 359-8513, Japan
| | - I Nagaoka
- Department of Host Defense and Biochemical Research, Juntendo University Graduate School of Medicine, Tokyo 113-8431, Japan
| | - H Tsuda
- Department of Basic Pathology, National Defense Medical College Hospital, Tokorozawa, Saitama 359-8513, Japan
| | - K Furuya
- Department of Obstetrics and Gynecology, National Defense Medical College Hospital, Tokorozawa, Saitama 359-8513, Japan
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Liu X, Yang G, Fan Q, Wang L. Proteomic profile in glomeruli of type-2 diabetic KKAy mice using 2-dimensional differential gel electrophoresis. Med Sci Monit 2014; 20:2705-13. [PMID: 25515740 PMCID: PMC4278697 DOI: 10.12659/msm.893078] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Background Diabetic nephropathy (DN) is a leading cause of end-stage renal disease. To search for glomerular proteins associated with early-stage DN, glomeruli of spontaneous type 2 diabetic KKAy mice were analyzed by 2-dimensional differential gel electrophoresis (2D-DIGE). Material/Methods Glomeruli of 20-week spontaneous type 2 diabetic KKAy mice and age-matched C57BL/6 mice were isolated by kidney perfusion with magnetic beads. Proteomic profiles of glomeruli were investigated by using 2D-DIGE and matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry. Western blot analysis was used to confirm the results of proteomics. Immunohistochemical and semi-quantitative analysis were used to confirm the differential expression of prohibitin and annexin A2 in glomeruli. Results We identified 19 differentially expressed proteins – 17 proteins were significantly up-regulated and 2 proteins were significantly down-regulated in glomeruli of diabetic KKAy mice. Among them, prohibitin and annexin A2 were up-regulated and Western blot analysis validated the same result in proteomics. Immunohistochemical analysis also revealed up-regulation of prohibitin and annexin A2 in glomeruli of KKAy mice. Conclusions Our findings suggest that prohibitin and annexin A2 may be associated with early-stage DN. Further functional research might help to reveal the pathogenesis of DN.
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Affiliation(s)
- Xiaodan Liu
- Department of Nephrology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning, China (mainland)
| | - Gang Yang
- Department of Nephrology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning, China (mainland)
| | - Qiuling Fan
- Department of Nephrology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning, China (mainland)
| | - Lining Wang
- Department of Nephrology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning, China (mainland)
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18
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Mao G, Lv L, Liu Y, Chen B, Li M, Ni T, Yang D, Zhu H, Xue Q, Ni R. The expression levels and prognostic value of high temperature required A2 (HtrA2) in NSCLC. Pathol Res Pract 2014; 210:939-43. [DOI: 10.1016/j.prp.2014.06.030] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2013] [Revised: 04/06/2014] [Accepted: 06/25/2014] [Indexed: 10/25/2022]
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Abstract
Our recent research identified the protein annexin A2 to be regulated by ovarian cancer-peritoneal cell interactions. This study investigated the role of annexin A2 in ovarian cancer metastasis and its potential utility as a novel therapeutic target, using in vitro and in vivo ovarian cancer models. Annexin A2 expression was examined by qRT-PCR and western blotting in ovarian cancer cell lines and immunohistochemistry in serous ovarian carcinoma tissues. Annexin A2 siRNAs were used to evaluate the effects of annexin A2 suppression on ovarian cancer cell adhesion, motility, and invasion. Furthermore, annexin A2 neutralizing antibodies were used to examine the role of annexin A2 in tumor invasion and metastasis in vivo using a chick chorioallantoic membrane assay and an intraperitoneal xenograft mouse model. Strong annexin A2 immunostaining was observed in 90% (38/42) of the serous ovarian cancer cells and was significantly increased in the cancer-associated stroma compared to non-malignant ovarian tissues. Annexin A2 siRNA significantly inhibited the motility and invasion of serous ovarian cancer cells and adhesion to the peritoneal cells. Annexin A2 neutralizing antibodies significantly inhibited OV-90 cell motility and invasion in vitro and in vivo using the chick chorioallantoic membrane assay. The growth of SKOV-3 cells and their peritoneal dissemination in nude mice was significantly inhibited by annexin A2 neutralizing antibodies. Annexin A2 plays a critical role in ovarian cancer metastasis and is therefore a potential novel therapeutic target against ovarian cancer.
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Annexin A2: its molecular regulation and cellular expression in cancer development. DISEASE MARKERS 2014; 2014:308976. [PMID: 24591759 PMCID: PMC3925611 DOI: 10.1155/2014/308976] [Citation(s) in RCA: 92] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/29/2013] [Revised: 10/31/2013] [Accepted: 11/01/2013] [Indexed: 01/05/2023]
Abstract
Annexin A2 (ANXA2) orchestrates multiple biologic processes and clinical associations, especially in cancer progression. The structure of ANXA2 affects its cellular localization and function. However, posttranslational modification and protease-mediated N-terminal cleavage also play critical roles in regulating ANXA2. ANXA2 expression levels vary among different types of cancers. With some cancers, ANXA2 can be used for the detection and diagnosis of cancer and for monitoring cancer progression. ANXA2 is also required for drug-resistance. This review discusses the feasibility of ANXA2 which is active in cancer development and can be a therapeutic target in cancer management.
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Pal P, Kanaujiya JK, Lochab S, Tripathi SB, Sanyal S, Behre G, Trivedi AK. Proteomic analysis of rosiglitazone and guggulsterone treated 3T3-L1 preadipocytes. Mol Cell Biochem 2012; 376:81-93. [PMID: 23275126 DOI: 10.1007/s11010-012-1551-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2012] [Accepted: 12/14/2012] [Indexed: 01/16/2023]
Abstract
Adipogenesis is the differentiation of preadipocytes to adipocytes which is marked by the accumulation of lipid droplets. Adipogenic differentiation of 3T3-L1 cells is achieved by exposing the cells to Insulin, Dexamethasone and IBMX for 5-7 days. Thiazolidinedione drugs, like rosiglitazone are potent insulin sensitizing agents and have been shown to enhance lipid droplet formation in 3T3-L1 cells, a model cell line for preadipocyte differentiation. Guggulsterone is a natural drug extracted from the gum resin of tree Commiphora mukul. Guggulsterone has been shown to inhibit adipogenesis and induce apoptosis in 3T3-L1 cells. In this study we treated the 3T3-L1 preadipocytes with rosiglitazone and guggulsterone and assessed the protein expression profile using 2D gel electrophoresis-based proteomics to find out differential target proteins of these drugs. The proteins that were identified upon rosiglitazone treatment generally regulate cell proliferation and/or exhibit anti-inflammatory effect which strengthens its differentiation-inducing property. Guggulsterone treatment resulted in the identification of the apoptosis-inducing proteins to be up regulated which rightly is in agreement with the apoptosis-inducing property of guggulsterone in 3T3-L1 cells. Some of the proteins identified in our proteomic screen such as Galectin1, AnnexinA2 & TCTP were further confirmed by Real Time qPCR. Thus, the present study provides a better outlook of proteins being differentially regulated/expressed upon treatment with rosiglitazone and guggulsterone. The detailed study of the differentially expressed proteins identified in this proteomic screen may further provide the better molecular insight into the mode of action of these anti-diabetic drugs rosiglitazone and guggulsterone.
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Affiliation(s)
- Pooja Pal
- Drug Target Discovery and Development Division, CSIR-Central Drug Research Institute, Jankipuram Extension, Lucknow, UP, India
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22
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Sun Y, Gao G, Cai J, Wang Y, Qu X, He L, Liu F, Zhang Y, Lin K, Ma S, Yang X, Qian X, Zhao X. Annexin A2 is a discriminative serological candidate in early hepatocellular carcinoma. Carcinogenesis 2012. [PMID: 23188673 PMCID: PMC3581600 DOI: 10.1093/carcin/bgs372] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
To date, the useful markers of hepatocellular carcinoma (HCC) remains incompletely developed. Here, we show that annexin A2 complement alpha-fetoprotein (AFP), a widely used liver cancer marker, in the serologically surveillance and early detection of HCC. First, differentially expressed proteins in HCC were identified using a subcellular proteomic approach. Annexin A2 was then selected for further verification. It was found to be overexpressed in HCC tissues (60.7%, 136/224). Using a self-estabished sandwich enzyme-linked immunosorbent assay, we found that annexin A2 significantly increased in the sera of HCC (n = 175, median, 24.75ng/µl) compared with the healthy (n = 49, median, 16.69ng/µl), benign tumors (n = 19, median, 19.92ng/µl), hepatitis (n = 23, median, 6.48ng/µl) and cirrhosis (n = 51, median, 7.39ng/µl) controls and other malignant tumors (n = 87). Importantly, raised concentrations of annexin A2 were observed in 83.2% (79/95) of early stage (median, 24.32ng/µl) and 78.4% (58/74) of AFP-negative (median, 24.09ng/µl) patients. Annexin A2 alone had a better area under the receiver-operating characteristic curve (AUC = 0.79, 95% confidence interval: 0.73–0.85) in comparison with AFP (AUC = 0.73, 95% confidence interval: 0.66–0.80) in detecting of early stage HCC. Combining both markers notably improved the diagnostic efficiency of early HCC with an achieved sensitivity of 87.4%. Additionally, the expression characteristics of annexin A2 during hepatocarcinogenesis were detected in p21-HBx gene knockin transgenic mice model. The results showed that annexin A2 expression was substantially elevated in HCC-bearing mice, in accordance with the finding in human samples. In conclusion, annexin A2 may be an independent serological candidate for hepatitis B virus–related HCC, especially in the early stage cases with normal serum AFP.
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Affiliation(s)
- Yulin Sun
- State Key Laboratory of Molecular Oncology, Cancer Institute & Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
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Wang CY, Chen CL, Tseng YL, Fang YT, Lin YS, Su WC, Chen CC, Chang KC, Wang YC, Lin CF. Annexin A2 silencing induces G2 arrest of non-small cell lung cancer cells through p53-dependent and -independent mechanisms. J Biol Chem 2012; 287:32512-24. [PMID: 22859294 DOI: 10.1074/jbc.m112.351957] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Annexin A2 (ANXA2) overexpression is required for cancer cell proliferation; however, the molecular mechanisms underlying ANXA2-mediated regulation of the cell cycle are still unknown. ANXA2 is highly expressed in non-small cell lung cancer (NSCLC) and is positively correlated with a poor prognosis. NSCLC A549 cells lacking ANXA2 exhibited defects in tumor growth in vivo and in cell proliferation in vitro without cytotoxicity. ANXA2 knockdown induced cell cycle arrest at G(2) phase. Unexpectedly, ANXA2 silencing increased the expression of p53 and its downstream genes, which resulted in p53-dependent and -independent G(2) arrest. Aberrant JNK inactivation, which was observed in ANXA2-deficient cells, inhibited cell proliferation following G(2) arrest. A lack of ANXA2 caused a loss of JNK-regulated c-Jun expression, resulting in an increase in p53 transcription. These results demonstrate a novel role for ANXA2 in NSCLC cell proliferation by facilitating the cell cycle partly through the regulation of p53 via JNK/c-Jun.
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Affiliation(s)
- Chi-Yun Wang
- Institute of Basic Medical Sciences, National Cheng Kung University, Tainan 701, Taiwan
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24
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Insulin receptor substrate 1 expression enhances the sensitivity of 32D cells to chemotherapy-induced cell death. Exp Cell Res 2012; 318:1745-58. [PMID: 22652453 DOI: 10.1016/j.yexcr.2012.04.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 04/25/2012] [Accepted: 04/29/2012] [Indexed: 01/02/2023]
Abstract
The adapters IRS1 and IRS2 link growth factor receptors to downstream signaling pathways that regulate proliferation and survival. Both suppress factor-withdrawal-induced apoptosis and have been implicated in cancer progression. However, recent studies suggest IRS1 and IRS2 mediate differential functions in cancer pathogenesis. IRS1 promoted breast cancer proliferation, while IRS2 promoted metastasis. The role of IRS1 and IRS2 in controlling cell responses to chemotherapy is unknown. To determine the role of IRS1 and IRS2 in the sensitivity of cells to chemotherapy, we treated 32D cells lacking or expressing IRS proteins with various concentrations of chemotherapeutic agents. We found that expression of IRS1, in contrast to IRS2, enhanced the sensitivity of 32D cells to chemotherapy-induced apoptosis. When IRS2 was expressed with IRS1, the cells no longer showed enhanced sensitivity. Expression of IRS1 did not alter the expression of pro- and anti-apoptotic proteins; however, 32D-IRS1 cells expressed higher levels of Annexin A2. In 32D-IRS1 cells, IRS1 and Annexin A2 were both located in cytoplasmic and membrane fractions. We also found that IRS1 coprecipitated with Annexin A2, while IRS2 did not. Decreasing Annexin A2 levels reduced 32D-IRS1 cell sensitivity to chemotherapy. These results suggest IRS1 enhances sensitivity to chemotherapy in part through Annexin A2.
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25
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Abstract
Wilms' tumour is a paediatric malignancy of the kidneys and is one of the most common solid childhood cancers. The Wilms' tumour 1 protein (WT1) is a transcription factor that can either activate or repress genes involved in growth, apoptosis and differentiation. It is frequently mutated or aberrantly expressed in Wilms' tumour, where the wild type protein would normally act as a tumour suppressor. Several studies, however, have found that wild type WT1 acts as an oncogene in adult tumours, primarily through the inhibition of apoptosis. The expression of WT1 correlates with the aggressiveness of several adult cancers, and its continued expression following treatment is indicative of a poor outcome.We recently found that the treatment of tumour cell lines with cytotoxic drugs leads to the cleavage of WT1 by the serine protease HtrA2. HtrA2 binds to a specific region of WT1, the suppression domain, and then cleaves WT1 at multiple sites. The HtrA2-mediated proteolysis of WT1 leads to its removal from gene promoter regions and changes in gene expression. Cleavage of WT1 by HtrA2 enhances apoptosis. This event is advantageous to the treatment of adult tumours where WT1 acts as an oncogene. However, when WT1 is acting as a tumour suppressor in paediatric malignancies, proteolysis by HtrA2 would be antagonistic to therapy.
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Affiliation(s)
- Jörg Hartkamp
- Faculty of Life Sciences, The Michael Smith Building, University of Manchester, Manchester, UK
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26
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Park SK, Jeon YM, Son BS, Youn HS, Lee MY. Proteomic analysis of the differentially expressed proteins by airborne nanoparticles. J Appl Toxicol 2011; 31:463-70. [PMID: 21491466 DOI: 10.1002/jat.1658] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2010] [Accepted: 12/23/2010] [Indexed: 12/12/2022]
Abstract
Airborne nanoparticles with thermodynamic diameters less than 56 nm (PM(0.056)) were collected using a Moudi cascade impactor, and the differentially expressed proteins upon exposure to the airborne nanoparticles were identified in human bronchial epithelial cells. More than 600 protein spots were detected on the two-dimensional gel, and the identified 13 of these proteins showed notable changes. Nine were up-regulated and four were down-regulated following treatment with the airborne nanoparticles. Notably, malignant transformation-associated multiple forms of keratins, epigenetic regulation-related MBD1-containing chromatin associated factor 2, epithelial malignancy-related vimentin and exocytosis-related annexin A2 were changed upon exposure to airborne nanoparticle PM(0.056).
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Affiliation(s)
- Seul Ki Park
- Department of Medical Biotechnology, SoonChunHyang University, Asan, Chungnam, 336-600, Republic of Korea
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27
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The role of annexin A2 in tumorigenesis and cancer progression. CANCER MICROENVIRONMENT 2011; 4:199-208. [PMID: 21909879 DOI: 10.1007/s12307-011-0064-9] [Citation(s) in RCA: 172] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2011] [Accepted: 02/21/2011] [Indexed: 02/06/2023]
Abstract
Annexin A2 is a calcium-dependent, phospholipid-binding protein found on various cell types. It is up-regulated in various tumor types and plays multiple roles in regulating cellular functions, including angiogenesis, proliferation, apoptosis, cell migration, invasion and adhesion. Annexin A2 binds with plasminogen and tissue plasminogen activator on the cell surface, which leads to the conversion of plasminogen to plasmin. Plasmin is a serine protease which plays a key role in the activation of metalloproteinases and degradation of extracellular matrix components essential for metastatic progression. We have recently found that both annexin A2 and plasmin are increased in conditioned media of co cultured ovarian cancer and peritoneal cells. Our studies suggest that annexin A2 is part of a tumor-host signal pathway between ovarian cancer and peritoneal cells which promotes ovarian cancer metastasis. Accumulating evidence suggest that interactions between annexin A2 and its binding proteins play an important role in the tumor microenvironment and act together to enhance cancer metastasis. This article reviews the current knowledge on the biological role of annexin A2 and its binding proteins in solid malignancies including ovarian cancer.
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28
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Won KJ, Lee P, Jung SH, Jiang X, Lee CK, Lin HY, Kang H, Lee HM, Kim J, Toyokuni S, Kim B. 3-morpholinosydnonimine participates in the attenuation of neointima formation via inhibition of annexin A2-mediated vascular smooth muscle cell migration. Proteomics 2010; 11:193-201. [PMID: 21204247 DOI: 10.1002/pmic.200900834] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2009] [Revised: 09/18/2010] [Accepted: 10/15/2010] [Indexed: 01/11/2023]
Abstract
3-Morpholinosydnonimine (SIN-1) affects vascular smooth muscle cell migration and proliferation, processes essential for atherosclerosis. However, the mechanism by which SIN-1 exerts these effects has not been elucidated. We used 2-DE followed by MALDI-TOF/TOF MS to identify responses in protein expression to SIN-1 in rat aortic smooth muscle. Platelet-derived growth factor-BB increased cell migration and proliferation in rat aortic smooth muscle cells, and subsequent SIN-1 treatment inhibited it. Administration of SIN-1 in vivo attenuated neointima formation in balloon-injured rat carotid arteries. Proteomic analysis showed that glutathione peroxidase and 40S ribosomal protein S12 were differentially expressed in aortic strips exposed to SIN-1. Expression of annexin A2 was decreased by SIN-1. Platelet-derived growth factor-BB-induced cell migration was increased and inhibited in rat aortic smooth muscle cells with overexpression and knockdown of annexin A2 gene, respectively. The expression of annexin A2 was increased in vascular neointima compared with the intact control, which was inhibited by SIN-1 treatment. These results demonstrate that SIN-1 may attenuate vascular neointima formation by inhibiting annexin A2-mediated migration. Therefore, annexin A2 may be a potential target for therapeutic strategies for atherosclerosis.
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Affiliation(s)
- Kyung-Jong Won
- Department of Physiology, School of Medicine, Konkuk University, Danwol-dong, Chungju, Korea
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29
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Liu A, Liu D, Zhao S, Zheng J, Cao D, Zhang H. Up regulation of annexin A2 on murine H22 hepatocarcinoma cells induced by cartilage polysaccharide. Cancer Epidemiol 2010; 35:490-6. [PMID: 21111695 DOI: 10.1016/j.canep.2010.10.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2010] [Revised: 10/16/2010] [Accepted: 10/22/2010] [Indexed: 02/08/2023]
Abstract
In this study, we investigated the antitumor effect of a tumor vaccine prepared from H22 hepatocarcinoma cells induced by cartilage polysaccharide. We found out there were specific antigens which combined with antigen-specific antibodies from immune murine serum. Results of western blot analysis showed that about 36 kDa make specific antibodies appeared specific antibodies in antiserum of immune mice, whereas the best immune effects became visible at the induction time of 48 h. Analyses of 2-dimensional electrophoresis identified the specific antigen was annexin A2, which was a glycosylated protein that contained a glycosylation site, closely related to oncogenesis, cancer development, invasion and metastasis. Proteomics indicated that both quantity and conformation of annexin A2 were changed after induced by cartilage polysaccharide. Lastly, we found there was a major increase of annexin A2 mRNA on H22 cells induced by cartilage polysaccharide. In summary, our data suggested that annexin A2, a specific antigen played a key role in antitumor immune response and activating the immune system. It would be a potential type of tumor vaccine which provided new ideas for tumor immunoprophylaxis.
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Affiliation(s)
- Anjun Liu
- Key Laboratory of Food Nutrition and Safety, Ministry of Education, College of Food Engineering and Biotechnology, Tianjin University of Science and Technology, Tianjin, China.
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30
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Zou C, Butler PL, Coon TA, Smith RM, Hammen G, Zhao Y, Chen BB, Mallampalli RK. LPS impairs phospholipid synthesis by triggering beta-transducin repeat-containing protein (beta-TrCP)-mediated polyubiquitination and degradation of the surfactant enzyme acyl-CoA:lysophosphatidylcholine acyltransferase I (LPCAT1). J Biol Chem 2010; 286:2719-27. [PMID: 21068446 DOI: 10.1074/jbc.m110.192377] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Acyl-CoA:lysophosphatidylcholine acyltransferase 1 (LPCAT1) is a relatively newly described and yet indispensable enzyme needed for generation of the bioactive surfactant phospholipid, dipalmitoylphosphatidylcholine (DPPtdCho). Here, we show that lipopolysaccharide (LPS) causes LPCAT1 degradation using the Skp1-Cullin-F-box ubiquitin E3 ligase component, β-transducin repeat-containing protein (β-TrCP), that polyubiquitinates LPCAT1, thereby targeting the enzyme for proteasomal degradation. LPCAT1 was identified as a phosphoenzyme as Ser(178) within a phosphodegron was identified as a putative molecular recognition site for glycogen synthase kinase-3β (GSK-3β) phosphorylation that recruits β-TrCP docking within the enzyme. β-TrCP ubiquitinates LPCAT1 at an acceptor site (Lys(221)), as substitution of Lys(221) with Arg abrogated LPCAT1 polyubiquitination. LPS profoundly reduced immunoreactive LPCAT1 levels and impaired lung surfactant mechanics, effects that were overcome by siRNA to β-TrCP and GSK-3β or LPCAT1 gene transfer, respectively. Thus, LPS appears to destabilize the LPCAT1 protein by GSK-3β-mediated phosphorylation within a canonical phosphodegron for β-TrCP docking and site-specific ubiquitination. LPCAT1 is the first lipogenic substrate for β-TrCP, and the results suggest that modulation of the GSK-3β-SCFβ(TrCP) E3 ligase effector pathway might be a unique strategy to optimize dipalmitoylphosphatidylcholine levels in sepsis.
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Affiliation(s)
- Chunbin Zou
- Department of Medicine, Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA
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31
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Li Y, Yue P, Deng X, Ueda T, Fukunaga R, Khuri FR, Sun SY. Protein phosphatase 2A negatively regulates eukaryotic initiation factor 4E phosphorylation and eIF4F assembly through direct dephosphorylation of Mnk and eIF4E. Neoplasia 2010; 12:848-55. [PMID: 20927323 PMCID: PMC2950334 DOI: 10.1593/neo.10704] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2010] [Revised: 07/09/2010] [Accepted: 07/09/2010] [Indexed: 01/11/2023]
Abstract
The eukaryotic translation initiation factor 4E (eIF4E) is frequently overexpressed in human cancers and is associated with cellular transformation, tumorigenesis, and metastatic progression. It is known that Mnks can phosphorylate eIF4E. Protein phosphatase 2A (PP2A) functions as a tumor suppressor, and it was previously suggested to regulate eIF4E phosphorylation. However, how PP2A regulates eIF4E phosphorylation has not been fully addressed. In this study, we have not only validated the role of PP2A in regulation of eIF4E phosphorylation but also demonstrated the mechanism underlying this process. Inhibition of PP2A using either okadaic acid or PP2A small interfering RNA (siRNA) increased eIF4E phosphorylation, which could be abolished by the presence of the Mnk inhibitor CGP57380 or deficiency of Mnk genes. Thus, Mnks are involved in PP2A-mediated regulation of eIF4E phosphorylation. Moreover, a dephosphorylation assay revealed that PP2A could directly dephosphorylate Mnk1 and eIF4E. m(7)GTP pull-down assay detected more eIF4G and phospho-eIF4E and less 4EBP-1 in PP2A siRNA-transfected cells than in control siRNA-transfected cells, indicating an increased cap binding of eIF4F complex. Accordingly, okadaic acid treatment or PP2A knockdown increased the levels of c-Myc and Mcl-1, which are proteins known to be regulated by a cap-dependent translation mechanism. Taken together, we conclude that PP2A negatively regulates eIF4E phosphorylation and eIF4F complex assembly through dephosphorylation of Mnk and eIF4E, thus suggesting a novel mechanism by which PP2A exerts its tumor-suppressive function.
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Affiliation(s)
- Yikun Li
- Department of Hematology and Medical Oncology, Emory University School of Medicine and Winship Cancer Institute, Atlanta, GA, USA
| | - Ping Yue
- Department of Hematology and Medical Oncology, Emory University School of Medicine and Winship Cancer Institute, Atlanta, GA, USA
| | - Xingming Deng
- Department of Radiation Oncology, Emory University School of Medicine and Winship Cancer Institute, Atlanta, GA, USA
| | - Takeshi Ueda
- Campbell Family Institute for Breast Cancer Research, Princess Margaret Hospital, Toronto, Ontario, Canada
| | - Rikiro Fukunaga
- Department of Medical Chemistry, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Fadlo R Khuri
- Department of Hematology and Medical Oncology, Emory University School of Medicine and Winship Cancer Institute, Atlanta, GA, USA
| | - Shi-Yong Sun
- Department of Hematology and Medical Oncology, Emory University School of Medicine and Winship Cancer Institute, Atlanta, GA, USA
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