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Sharafutdinov I, Harrer A, Müsken M, Rottner K, Sticht H, Täger C, Naumann M, Tegtmeyer N, Backert S. Cortactin-dependent control of Par1b-regulated epithelial cell polarity in Helicobacter infection. Cell Insight 2024; 3:100161. [PMID: 38646547 PMCID: PMC11033139 DOI: 10.1016/j.cellin.2024.100161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 03/01/2024] [Accepted: 03/02/2024] [Indexed: 04/23/2024]
Abstract
Cell polarity is crucial for gastric mucosal barrier integrity and mainly regulated by polarity-regulating kinase partitioning-defective 1b (Par1b). During infection, the carcinogen Helicobacter pylori hijacks Par1b via the bacterial oncoprotein CagA leading to loss of cell polarity, but the precise molecular mechanism is not fully clear. Here we discovered a novel function of the actin-binding protein cortactin in regulating Par1b, which forms a complex with cortactin and the tight junction protein zona occludens-1 (ZO-1). We found that serine phosphorylation at S405/418 and the SH3 domain of cortactin are important for its interaction with both Par1b and ZO-1. Cortactin knockout cells displayed disturbed Par1b cellular localization and exhibited morphological abnormalities that largely compromised transepithelial electrical resistance, epithelial cell polarity, and apical microvilli. H. pylori infection promoted cortactin/Par1b/ZO-1 abnormal interactions in the tight junctions in a CagA-dependent manner. Infection of human gastric organoid-derived mucosoids supported these observations. We therefore hypothesize that CagA disrupts gastric epithelial cell polarity by hijacking cortactin, and thus Par1b and ZO-1, suggesting a new signaling pathway for the development of gastric cancer by Helicobacter.
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Affiliation(s)
- Irshad Sharafutdinov
- Department of Biology, Division of Microbiology, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91058, Erlangen, Germany
| | - Aileen Harrer
- Department of Biology, Division of Microbiology, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91058, Erlangen, Germany
| | - Mathias Müsken
- Central Facility for Microscopy, Helmholtz Centre for Infection Research, D-38124, Braunschweig, Germany
| | - Klemens Rottner
- Department of Cell Biology, Helmholtz Centre for Infection Research, D-38124, Braunschweig, Germany
- Division of Molecular Cell Biology, Zoological Institute, Technische Universität Braunschweig, D-38106, Braunschweig, Germany
| | - Heinrich Sticht
- Division of Bioinformatics, Institute of Biochemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91054, Erlangen, Germany
| | - Christian Täger
- Otto von Guericke University, Institute of Experimental Internal Medicine, Medical Faculty, D-39120, Magdeburg, Germany
| | - Michael Naumann
- Otto von Guericke University, Institute of Experimental Internal Medicine, Medical Faculty, D-39120, Magdeburg, Germany
| | - Nicole Tegtmeyer
- Department of Biology, Division of Microbiology, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91058, Erlangen, Germany
| | - Steffen Backert
- Department of Biology, Division of Microbiology, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91058, Erlangen, Germany
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2
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Xiao Y, Chen Y, Chen J, Dong J. ASPP2 Is Phosphorylated by CDK1 during Mitosis and Required for Pancreatic Cancer Cell Proliferation. Cancers (Basel) 2023; 15:5424. [PMID: 38001686 PMCID: PMC10670399 DOI: 10.3390/cancers15225424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 11/10/2023] [Accepted: 11/13/2023] [Indexed: 11/26/2023] Open
Abstract
(1) Background: pancreatic cancer is highly lethal. The role of apoptosis-stimulating protein of p53-2 (ASPP2) in this lethal disease remains unclear. This protein belongs to the ASPP family of p53 interacting proteins. Previous studies in this lab used phosphate-binding tag (Phos-tag) sodium dodecyl sulfate (SDS) polyacrylamide gels and identified a motility upshift of the ASPP family of proteins during mitosis. (2) Purpose: this study expands on previous findings to identify the detailed phosphorylation regulation of ASPP2 during mitosis, as well as the function of ASPP2 in pancreatic cancer. (3) Methods: the Phos-tag technique was used to investigate the phosphorylation mechanism of ASPP2 during mitosis. Phospho-specific antibodies were generated to validate the phosphorylation of ASPP2, and ASPP2-inducible expression cell lines were established to determine the role of ASPP2 in pancreatic cancer. RNA sequencing (RNA-Seq) was used to uncover the downstream targets of ASPP2. (4) Results: results demonstrate that ASPP2 is phosphorylated during mitosis by cyclin-dependent kinase 1 (CDK1) at sites S562 and S704. In vitro and in vivo results show that ASPP2 is required for pancreatic cancer growth. Furthermore, the expressions of yes-associated protein (YAP)-related genes are found to be dramatically altered by ASPP2 depletion. Together, these findings reveal the phosphorylation mechanism of ASPP2 during mitosis. Collectively, results strongly indicate that ASPP2 is a potential target for abating tumor cell growth in pancreatic cancer.
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Affiliation(s)
| | | | | | - Jixin Dong
- Eppley Institute for Research in Cancer and Allied Diseases, Fred & Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE 68198, USA; (Y.X.); (Y.C.); (J.C.)
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3
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Smirnov A, Magri A, Lotz R, Han X, Yin C, Harris M, Osterburg C, Dötsch V, McKeating JA, Lu X. ASPP2 binds to hepatitis C virus NS5A protein via an SH3 domain/PxxP motif-mediated interaction and potentiates infection. J Gen Virol 2023; 104:10.1099/jgv.0.001895. [PMID: 37750869 PMCID: PMC7615710 DOI: 10.1099/jgv.0.001895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/27/2023] Open
Abstract
Hepatitis C virus (HCV) infects millions of people worldwide and is a leading cause of liver disease. Despite recent advances in antiviral therapies, viral resistance can limit drug efficacy and understanding the mechanisms that confer viral escape is important. We employ an unbiased interactome analysis to discover host binding partners of the HCV non-structural protein 5A (NS5A), a key player in viral replication and assembly. We identify ASPP2, apoptosis-stimulating protein of p53, as a new host co-factor that binds NS5A via its SH3 domain. Importantly, silencing ASPP2 reduces viral replication and spread. Our study uncovers a previously unknown role for ASPP2 to potentiate HCV RNA replication.
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Affiliation(s)
- Artem Smirnov
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
- Department of Experimental Medicine, TOR, University of Rome “Tor Vergata”, Rome 00133, Italy
| | - Andrea Magri
- Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7FZ, UK
| | - Rebecca Lotz
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany
| | - Xiaoyue Han
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Chunhong Yin
- School of Molecular and Cellular Biology, Faculty of Biological Sciences, and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, UK
| | - Mark Harris
- School of Molecular and Cellular Biology, Faculty of Biological Sciences, and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, UK
| | - Christian Osterburg
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany
| | - Volker Dötsch
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany
| | - Jane A. McKeating
- Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7FZ, UK
- Chinese Academy of Medical Sciences Oxford Institute, University of Oxford, Oxford, UK
| | - Xin Lu
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
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4
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Wang Y, Yan Y, Huo Y, Pang Y, Chan L, Wang S, Chen D, Lin D, Wang W. mRNA sequencing and CyTOF analysis revealed ASPP2 altered the response patterns of hepatocellular carcinoma HepG2 cells to usnic acid. Naunyn Schmiedebergs Arch Pharmacol 2023; 396:1847-1856. [PMID: 36877271 DOI: 10.1007/s00210-023-02428-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Accepted: 02/16/2023] [Indexed: 03/07/2023]
Abstract
In a previous study, our team found that ASPP2 overexpression increases the sensitivity of liver cancer cells to sorafenib. ASPP2 is an important target in the study of drug therapy for hepatocellular carcinoma. In this study, we demonstrated that ASPP2 altered the response of HepG2 cells to usnic acid (UA) by using mRNA sequencing and CyTOF. CCK8 assay was used to detect cytotoxicity of UA on HepG2 cells. Annexin V-RPE assay, TUNEL assay, and cleaved caspase 3 assay were performed to examine the apoptotic cell death induced by UA. Transcriptomic sequencing and a single-cell mass cytometry were used to analyze the dynamic response of HepG2shcon and HepG2shASPP2 cells to UA treatment. We have demonstrated that UA could inhibit proliferation in HepG2 cells in a concentration-dependent manner. Apoptotic cell death was significantly induced by UA in HepG2 cells, while knocking down ASPP2 could increase the resistance of HepG2 cells to UA. Data from mRNA-Seq indicated that knockout of ASPP2 in HepG2 cells affected cell proliferation, cycle, and metabolism. ASPP2 knockdown resulted in increased stemness and decreased apoptosis of HepG2 cells under the action of UA. CyTOF analysis confirmed the above results, ASPP2 knockdown increased oncoproteins in HepG2 cells and altered response patterns of HepG2 cells to UA. Our data suggested that the natural compound UA could inhibit liver cancer HepG2 cells; meanwhile, ASPP2 knockdown could affect response patterns of HepG2 cells to UA. The above results indicate that ASPP2 could be a research target in the chemoresistance of liver cancer.
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Affiliation(s)
- Yang Wang
- Beijing Institute of Hepatology Beijing You An Hospital Capital Medical University, Beijing, China
| | - Yadong Yan
- Beijing Institute of Hepatology Beijing You An Hospital Capital Medical University, Beijing, China
- Xuanwu Hospital, Capital Medical University, Beijing, China
- Beijing You An Hospital, Capital Medical University, Beijing, China
| | - Yunfei Huo
- Beijing Institute of Hepatology Beijing You An Hospital Capital Medical University, Beijing, China
| | - Yuheng Pang
- Beijing Institute of Hepatology Beijing You An Hospital Capital Medical University, Beijing, China
| | - Liujia Chan
- Beijing Institute of Hepatology Beijing You An Hospital Capital Medical University, Beijing, China
| | - Shanshan Wang
- Beijing Institute of Hepatology Beijing You An Hospital Capital Medical University, Beijing, China
| | - Dexi Chen
- Beijing Institute of Hepatology Beijing You An Hospital Capital Medical University, Beijing, China
| | - Dongdong Lin
- Xuanwu Hospital, Capital Medical University, Beijing, China.
- Beijing You An Hospital, Capital Medical University, Beijing, China.
| | - Wenjing Wang
- Beijing Institute of Hepatology Beijing You An Hospital Capital Medical University, Beijing, China.
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5
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Liang B, Jiang Y, Song S, Jing W, Yang H, Zhao L, Chen Y, Tang Q, Li X, Zhang L, Bao H, Huang G, Zhao J. ASPP2 suppresses tumour growth and stemness characteristics in HCC by inhibiting Warburg effect via WNT/β-catenin/HK2 axis. J Cell Mol Med 2023; 27:659-671. [PMID: 36752127 PMCID: PMC9983321 DOI: 10.1111/jcmm.17687] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 01/09/2023] [Accepted: 01/16/2023] [Indexed: 02/09/2023] Open
Abstract
Abnormal energy metabolism is one of the characteristics of tumours. In the last few years, more and more attention is being paid to the role and regulation of tumour aerobic glycolysis. Cancer cells display enhanced aerobic glycolysis, also known as the Warburg effect, whereby tumour cells absorb glucose to produce a large amount of lactic acid and energy under aerobic conditions to favour tumour proliferation and metastasis. In this study, we report that the haploinsufficient tumour suppressor ASPP2, can inhibit HCC growth and stemness characteristics by regulating the Warburg effect through the WNT/β-catenin pathway. we performed glucose uptake, lactate production, pyruvate production, ECAR and OCR assays to verify ASPP2 can inhibit glycolysis in HCC cells. The expression of ASPP2 and HK2 was significantly inversely correlated in 80 HCC tissues. Our study reveals downregulation of ASPP2 can promote the aerobic glycolysis metabolism pathway, increasing HCC proliferation, glycolysis metabolism, stemness and drug resistance. This ASPP2-induced inhibition of glycolysis metabolism depends on the WNT/β-catenin pathway. ASPP2-regulated Warburg effect is associated with tumour progression and provides prognostic value. and suggest that may be promising as a new therapeutic strategy in HCC.
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Affiliation(s)
- Beibei Liang
- Shanghai Key Laboratory of Molecular Imaging, Jiading District Central Hospital Affiliated Shanghai University of Medicine and Health Sciences, Shanghai, China
| | - Yuan Jiang
- Shanghai Key Laboratory of Molecular Imaging, Jiading District Central Hospital Affiliated Shanghai University of Medicine and Health Sciences, Shanghai, China.,Medical Engineering Department, The Affiliated Hospital of QingDao University, Qingdao, Shandong, China
| | - Shaohua Song
- Liver Transplantation Center, Department of General Surgery, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Wei Jing
- Department of Surgery, Changhai Hospital, Navy Military Medical University, Shanghai, China
| | - Hao Yang
- Shanghai Key Laboratory of Molecular Imaging, Jiading District Central Hospital Affiliated Shanghai University of Medicine and Health Sciences, Shanghai, China
| | - Li Zhao
- Department of Nuclear Medicine, Institute of Clinical Nuclear Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Ya Chen
- Shanghai Key Laboratory of Molecular Imaging, Jiading District Central Hospital Affiliated Shanghai University of Medicine and Health Sciences, Shanghai, China.,Shanghai Skin Disease Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Qiqi Tang
- Shanghai Key Laboratory of Molecular Imaging, Jiading District Central Hospital Affiliated Shanghai University of Medicine and Health Sciences, Shanghai, China
| | - Xuhui Li
- Shanghai Key Laboratory of Molecular Imaging, Jiading District Central Hospital Affiliated Shanghai University of Medicine and Health Sciences, Shanghai, China
| | - Lisha Zhang
- Shanghai Key Laboratory of Molecular Imaging, Jiading District Central Hospital Affiliated Shanghai University of Medicine and Health Sciences, Shanghai, China
| | - Haili Bao
- Department of Organ Transplantation, Shanghai Changzheng Hospital, Navy Military Medical University, Shanghai, China
| | - Gang Huang
- Shanghai Key Laboratory of Molecular Imaging, Jiading District Central Hospital Affiliated Shanghai University of Medicine and Health Sciences, Shanghai, China
| | - Jian Zhao
- Shanghai Key Laboratory of Molecular Imaging, Jiading District Central Hospital Affiliated Shanghai University of Medicine and Health Sciences, Shanghai, China
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6
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Xie F, Xu HF, Zhang J, Liu XN, Kou BX, Cai MY, Wu J, Dong JL, Meng QH, Wang Y, Chen D, Zhang Y. Dysregulated hepatic lipid metabolism and gut microbiota associated with early-stage NAFLD in ASPP2-deficiency mice. Front Immunol 2022; 13:974872. [PMID: 36466835 PMCID: PMC9716097 DOI: 10.3389/fimmu.2022.974872] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Accepted: 11/02/2022] [Indexed: 10/13/2023] Open
Abstract
BACKGROUND Growing evidence indicates that lipid metabolism disorders and gut microbiota dysbiosis were related to the progression of non-alcoholic fatty liver disease (NAFLD). Apoptosis-stimulating p53 protein 2 (ASPP2) has been reported to protect against hepatocyte injury by regulating the lipid metabolism, but the mechanisms remain largely unknown. In this study, we investigate the effect of ASPP2 deficiency on NAFLD, lipid metabolism and gut microbiota using ASPP2 globally heterozygous knockout (ASPP2+/-) mice. METHODS ASPP2+/- Balb/c mice were fed with methionine and choline deficient diet for 3, 10 and 40 day to induce an early and later-stage of NAFLD, respectively. Fresh fecal samples were collected and followed by 16S rRNA sequencing. HPLC-MRM relative quantification analysis was used to identify changes in hepatic lipid profiles. The expression level of innate immunity-, lipid metabolism- and intestinal permeability-related genes were determined. A spearman's rank correlation analysis was performed to identify possible correlation between hepatic medium and long-chain fatty acid and gut microbiota in ASPP2-deficiency mice. RESULTS Compared with the WT control, ASPP2-deficiency mice developed moderate steatosis at day 10 and severe steatosis at day 40. The levels of hepatic long chain omega-3 fatty acid, eicosapentaenoic (EPA, 20:5 n-3) and docosahexaenoic (DHA, 22:6 n-3), were decreased at day 10 and increased at day 40 in ASPP+/- mice. Fecal microbiota analysis showed significantly increased alpha and beta diversity, as well as the composition of gut microbiota at the phylum, class, order, family, genus, species levels in ASPP2+/- mice. Moreover, ASPP-deficiency mice exhibited impaired intestinal barrier function, reduced expression of genes associated with chemical barrier (REG3B, REG3G, Lysozyme and IAP), and increased expression of innate immune components (TLR4 and TLR2). Furthermore, correlation analysis between gut microbiota and fatty acids revealed that EPA was significantly negatively correlated with Bifidobacterium family. CONCLUSION Our findings suggested that ASPP2-deficiency promotes the progression of NAFLD, alterations in fatty acid metabolism and gut microbiota dysbiosis. The long chain fatty acid EPA was significantly negatively correlated with Bifidobacterial abundance, which is a specific feature of NAFLD in ASPP2-deficiency mice. Totally, the results provide evidence for a mechanism of ASPP2 on dysregulation of fatty acid metabolism and gut microbiota dysbiosis.
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Affiliation(s)
- Fang Xie
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China
- Beijing Engineering Research Center for Precision Medicine and Transformation of Hepatitis and Liver Cancer, Beijing Institute of Hepatology, Beijing, China
| | - Hang-fei Xu
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China
- Department of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China
| | - Jing Zhang
- Department of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China
| | - Xiao-ni Liu
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China
- Beijing Engineering Research Center for Precision Medicine and Transformation of Hepatitis and Liver Cancer, Beijing Institute of Hepatology, Beijing, China
| | - Bu-xin Kou
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China
- Beijing Engineering Research Center for Precision Medicine and Transformation of Hepatitis and Liver Cancer, Beijing Institute of Hepatology, Beijing, China
| | - Meng-yin Cai
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China
- Beijing Engineering Research Center for Precision Medicine and Transformation of Hepatitis and Liver Cancer, Beijing Institute of Hepatology, Beijing, China
| | - Jing Wu
- Department of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China
| | - Jin-ling Dong
- Department of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China
| | - Qing-hua Meng
- Department of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China
| | - Yi Wang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, China
| | - Dexi Chen
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China
- Beijing Engineering Research Center for Precision Medicine and Transformation of Hepatitis and Liver Cancer, Beijing Institute of Hepatology, Beijing, China
| | - Yang Zhang
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China
- Beijing Engineering Research Center for Precision Medicine and Transformation of Hepatitis and Liver Cancer, Beijing Institute of Hepatology, Beijing, China
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7
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Yao J, Yang H, Wang H, Shi H, Jiao Y, Zhang Y, Chen D, Shi H. ASPP2 Coordinates ERS-Mediated Autophagy and Apoptosis Through mTORC1 Pathway in Hepatocyte Injury Induced by TNF-α. Front Pharmacol 2022; 13:865389. [PMID: 35418864 PMCID: PMC8996113 DOI: 10.3389/fphar.2022.865389] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Accepted: 02/28/2022] [Indexed: 11/28/2022] Open
Abstract
Background: Though ASPP2 plays an important role in regulating cell apoptosis and autophagy in case of liver injury, there remains a lack of clarity on the molecular mechanism of ASPP2 regulating autophagy and apoptosis. Methods: A hepatocyte injury model was constructed using HL7702 cell line and TNF-α. The cells were treated by ASPP2 overexpression adenovirus or short hairpin RNA lentivirus and endoplasmic reticulum stress (ERS) or the mammalian target of rapamycin (mTOR) inhibitor or agonist, respectively. The autophagy was detected by means of western blot and Green fluorescent protein-labeled- Microtubule-associated protein light chain 3 (GFP-LC3) plasmid transfection, while the apoptosis was detected through western blot, flow cytometry and TUNEL assay. Besides, the proteins related to ERS and mTOR were detected by western blot. Results: The low level of ASPP2 expression was accompanied by high-level autophagy and low-level apoptosis and vice versa in case of hepatocyte injury induce by TNF-α. By upregulating the proteins related to mTORC1 and ERS, ASPP2 induced apoptosis but inhibited autophagy. However, the effect of ASPP2 on autophagy and apoptosis can be reversed by the use of mTORC1 and ERS interfering agent, which indicates that ASPP2 regulated autophagy and apoptosis through mTORC1and ERS pathway. ERS treatment made no difference to the expression of ASPP2 and mTOR-related proteins, which suggests the possibility that the regulation of ERS on apoptosis and autophagy could occur in the downstream of ASPP2 and mTOR. Conclusion: ASPP2 could inhibit autophagy and induce apoptosis through mTORC1-ERS pathway in case of the hepatocyte injury induce by TNF-α. The role of ASPP2-mTORC1-ERS axis was verified in hepatocyte injury, which suggests the possibility that ASPP2 is an important regulatory molecule for the survival and death of hepatocyte.
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Affiliation(s)
- Jia Yao
- Gastroenterology Department, General Surgery Department and Gastroenterology Department, ShanxiBethuneHospital, Shanxi Academy of Medical Sciences Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan, China
| | - Hui Yang
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Department of Nephrology, Army Medical Center, Army Medical University, Chongqing, China
| | - Han Wang
- Gastroenterology Department, General Surgery Department and Gastroenterology Department, ShanxiBethuneHospital, Shanxi Academy of Medical Sciences Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan, China
| | - Honglin Shi
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Beijing Engineering Research Center for Precision Medicine and Transformation of Hepatitis and Liver Cancer, Beijing, China
| | - Yan Jiao
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Beijing Engineering Research Center for Precision Medicine and Transformation of Hepatitis and Liver Cancer, Beijing, China
| | - Ying Zhang
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Beijing Engineering Research Center for Precision Medicine and Transformation of Hepatitis and Liver Cancer, Beijing, China
| | - Dexi Chen
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Beijing Engineering Research Center for Precision Medicine and Transformation of Hepatitis and Liver Cancer, Beijing, China
| | - Hongbo Shi
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Beijing Engineering Research Center for Precision Medicine and Transformation of Hepatitis and Liver Cancer, Beijing, China
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8
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Shimada H, Kohno T, Konno T, Okada T, Saito K, Shindo Y, Kikuchi S, Tsujiwaki M, Ogawa M, Matsuura M, Saito T, Kojima T. The Roles of Tricellular Tight Junction Protein Angulin-1/Lipolysis-Stimulated Lipoprotein Receptor (LSR) in Endometriosis and Endometrioid-Endometrial Carcinoma. Cancers (Basel) 2021; 13:6341. [PMID: 34944960 PMCID: PMC8699113 DOI: 10.3390/cancers13246341] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 12/04/2021] [Accepted: 12/05/2021] [Indexed: 12/11/2022] Open
Abstract
Tight junction proteins play roles beyond permeability barriers functions and control cell proliferation and differentiation. The relation between tight junctions and the signal transduction pathways affects cell growth, invasion and migration. Abnormality of tight junction proteins closely contributes to epithelial mesenchymal transition (EMT) and malignancy of various cancers. Angulin-1/lipolysis-stimulated lipoprotein receptor (LSR) forms tricellular contacts that has a barrier function. Downregulation of angulin-1/LSR correlates with the malignancy in various cancers, including endometrioid-endometrial carcinoma (EEC). These alterations have been shown to link to not only multiple signaling pathways such as Hippo/YAP, HDAC, AMPK, but also cell metabolism in ECC cell line Sawano. Moreover, loss of angulin-1/LSR upregulates claudin-1, and loss of apoptosis stimulating p53 protein 2 (ASPP2) downregulates angulin-1/LSR. Angulin-1/LSR and ASPP2 concentrate at both midbody and centrosome in cytokinesis. In EEC tissues, angulin-1/LSR and ASPP2 are reduced and claudin-2 is overexpressed during malignancy, while in the tissues of endometriosis changes in localization of angulin-1/LSR and claudin-2 are seen. This review highlights how downregulation of angulin-1/LSR promotes development of endometriosis and EEC and discusses about the roles of angulin-1/LSR and its related proteins, including claudins and ASPP2.
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Affiliation(s)
- Hiroshi Shimada
- Department of Cell Science, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (H.S.); (T.K.); (T.O.); (K.S.); (Y.S.)
- Departments of Obstetrics, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (M.O.); (M.M.); (T.S.)
| | - Takayuki Kohno
- Department of Cell Science, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (H.S.); (T.K.); (T.O.); (K.S.); (Y.S.)
| | - Takumi Konno
- Department of Cell Science, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (H.S.); (T.K.); (T.O.); (K.S.); (Y.S.)
| | - Tadahi Okada
- Department of Cell Science, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (H.S.); (T.K.); (T.O.); (K.S.); (Y.S.)
- Departments of Obstetrics, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (M.O.); (M.M.); (T.S.)
| | - Kimihito Saito
- Department of Cell Science, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (H.S.); (T.K.); (T.O.); (K.S.); (Y.S.)
- Departments of Obstetrics, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (M.O.); (M.M.); (T.S.)
| | - Yuma Shindo
- Department of Cell Science, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (H.S.); (T.K.); (T.O.); (K.S.); (Y.S.)
| | - Shin Kikuchi
- Department of Anatomy, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan;
| | - Mitsuhiro Tsujiwaki
- Department of Pathology, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan;
| | - Marie Ogawa
- Departments of Obstetrics, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (M.O.); (M.M.); (T.S.)
| | - Motoki Matsuura
- Departments of Obstetrics, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (M.O.); (M.M.); (T.S.)
| | - Tsuyoshi Saito
- Departments of Obstetrics, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (M.O.); (M.M.); (T.S.)
| | - Takashi Kojima
- Department of Cell Science, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (H.S.); (T.K.); (T.O.); (K.S.); (Y.S.)
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9
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Rieger I, Tsintari V, Overkamp M, Fend F, Lopez CD, Schittenhelm MM, Kampa-Schittenhelm KM. ASPP2κ Is Expressed In Human Colorectal Carcinoma And Promotes Chemotherapy Resistance And Tumorigenesis. Front Mol Biosci 2021; 8:727203. [PMID: 34805267 PMCID: PMC8602356 DOI: 10.3389/fmolb.2021.727203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 10/14/2021] [Indexed: 11/30/2022] Open
Abstract
Alternative splicing is a common physiologic mechanism to generate numerous distinct gene products from one gene locus, which can result in unique gene products with differing important functional outcomes depending on cell context. Aberrant alternative splicing is a hallmark of cancer that can contribute to oncogenesis and aggressiveness of the disease as well as resistance to therapy. However, aberrant splicing might also result in novel targets for cancer therapy. ASPP2 is a haplo-insufficient tumor suppressor, that functions through both p53-dependent as well as p53-independent mechanisms to enhance cell death after stress. Interestingly, the common human tumor TP53 mutations result in a loss of the binding sites to ASPP2, leading to impaired induction of apoptosis. Vice versa, attenuation of ASPP2 has been described to be associated with high-risk disease, therapy failure and poor clinical outcome especially in tumors harboring the TP53 wildtype (WT) isoform. We have recently identified a novel, dominant-negative splicing variant of ASPP2, named ASPP2κ, with oncogenic potential. Exon-skipping results in a reading-frame shift with a premature translation stop, omitting most of the ASPP2 C-terminus - which harbors the p53-binding domain. Consequently, the ASPP2-p53 interaction is abrogated, which in part impacts on oncogenesis, aggressiveness of disease and response to therapy. Since ASPP2κ has been shown in hematologic malignancies to promote tumorigenesis, we further wished to determine if aberrant ASPP2κ expression plays a role in human solid tumors. In this report, we find that ASPP2κ is frequently expressed in human colorectal tumors (CRC). Using ASPP2κ overexpressing and interference CRC models, we demonstrate a functional role of ASPP2κ in contributing to oncogenesis and resistance to therapy in CRC by 1) enhancing proliferation, 2) promoting cell migration and, 3) conferring resistance to chemotherapy induced apoptosis. Our findings have far-reaching consequences for future diagnostic and therapeutic strategies for ASPP2κ expressing colorectal cancer patients and provide proof-of-principle to further explore ASPP2κ as potential predictive marker and target for therapy in clinical trials.
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Affiliation(s)
- Ingmar Rieger
- Department of Oncology, Hematology, Clinical Immunology and Rheumatology, University Hospital Tübingen (UKT), Tübingen, Germany
| | - Vasileia Tsintari
- Department of Oncology, Hematology, Clinical Immunology and Rheumatology, University Hospital Tübingen (UKT), Tübingen, Germany
| | - Mathis Overkamp
- Institute of Pathology at the University Hospital Tübingen, Tübingen, Germany
| | - Falko Fend
- Institute of Pathology at the University Hospital Tübingen, Tübingen, Germany
| | - Charles D Lopez
- Department of Hematology and Medical Oncology, Oregon Health and Science University (OHSU), Portland, OR, United States
| | - Marcus M Schittenhelm
- Clinic of Medical Oncology and Hematology, Cantonal Hospital St. Gallen (KSSG), St. Gallen, Switzerland
| | - Kerstin M Kampa-Schittenhelm
- Department of Oncology, Hematology, Clinical Immunology and Rheumatology, University Hospital Tübingen (UKT), Tübingen, Germany.,Translational Experimental Hematology and Oncology, Medical Research Center and Department of Oncology and Hematology, Cantonal Hospital St. Gallen, St. Gallen, Switzerland
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10
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Wang S, Sun Y, Wang Y, Wang A, Kou B, Che Y, Chen D, Zhang Y, Shi Y. ASPP2 inhibits hepatitis B virus replication by preventing nucleus translocation of HSF1 and attenuating the transactivation of ATG7. J Cell Mol Med 2021; 25:6899-6908. [PMID: 34085409 PMCID: PMC8278078 DOI: 10.1111/jcmm.16699] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 04/22/2021] [Accepted: 05/12/2021] [Indexed: 12/13/2022] Open
Abstract
Hepatitis B virus (HBV) is a kind of virus with the capability to induce autophagy, thereby facilitating its replication. Reducing hepatocyte autophagy is proved to be a useful way to inhibit HBV replication. Herein, we reported that p53-binding protein 2 (apoptosis-stimulating protein of p53-2, ASPP2) could attenuate HBV-induced hepatocyte autophagy in a p53-independent manner. Mechanistically, overexpressed ASPP2 binds to HSF1 in cytoplasm of HBV-infected cells, which prevents the translocation of HSF1 to nuclei, thereby inhibiting the transactivation of Atg7. By regulating the transcription of Atg7, ASPP2 reduces hepatocyte autophagy, thereby inhibiting HBV replication. Therefore, ASPP2 is a key regulator of cell autophagy, and overexpression of ASPP2 could be a novel method to inhibit HBV replication in hepatocytes.
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Affiliation(s)
- Shanshan Wang
- Capital Medical University Affiliated Beijing You’an HospitalBeijingChina
- Beijing Institute of HepatologyBeijingChina
| | - Yu Sun
- Minimally Invasive Interventional Centre of OncologyBeijing You’an HospitalCapital Medical UniversityBeijingChina
| | - Yang Wang
- Capital Medical University Affiliated Beijing You’an HospitalBeijingChina
- Beijing Institute of HepatologyBeijingChina
| | - Anna Wang
- Capital Medical University Affiliated Beijing You’an HospitalBeijingChina
| | - Buxin Kou
- Capital Medical University Affiliated Beijing You’an HospitalBeijingChina
- Beijing Institute of HepatologyBeijingChina
| | - Yang Che
- Capital Medical University Affiliated Beijing You’an HospitalBeijingChina
- Beijing Institute of HepatologyBeijingChina
| | - Dexi Chen
- Capital Medical University Affiliated Beijing You’an HospitalBeijingChina
- Beijing Institute of HepatologyBeijingChina
| | - Yulin Zhang
- Capital Medical University Affiliated Beijing You’an HospitalBeijingChina
| | - Ying Shi
- Capital Medical University Affiliated Beijing You’an HospitalBeijingChina
- Beijing Institute of HepatologyBeijingChina
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11
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Mao J, Tan Z, Pan X, Meng F. ASPP2 expression predicts the prognosis of patients with hepatocellular carcinoma after transcatheter arterial chemoembolization. Exp Ther Med 2021; 21:397. [PMID: 33680119 PMCID: PMC7918402 DOI: 10.3892/etm.2021.9828] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Accepted: 12/19/2019] [Indexed: 12/14/2022] Open
Abstract
Transcatheter arterial chemoembolization (TACE) induces ischemia-hypoxia and local chemotherapy-induced cytotoxicity which destroys cancerous cells. However, some patients do not respond to TACE. The causes for such a lack of response remain unclear. Recent studies have revealed that self-regulation of apoptosis-stimulating p53 protein 2 (ASPP2) may play an important role in promoting cell survival under hypoxic conditions as well as chemotherapy resistance via autophagy in various types of cancer. We measured the expression of ASPP2, autophagy-related proteins and apoptotic proteins by western blot assays. Multivariate logistic regression analysis was used to identify the independent risk factor. The present study found that ASPP2 expression was negatively correlated with that of BECN-1 (Beclin-1) in hepatocellular carcinoma (HCC) tissues. The expression of ASPP-1 was lower while that of Beclin-1 was higher in patients who underwent recurrence of HCC following TACE, than in those who do not undergo such a relapse. ASPP2 expression was also lower in cancerous tissues subjected to TACE, compared with that of directly resected cancerous tissue. The expression of LC3-II was also higher in patients with post-operative recurrence of HCC than in those without relapse. In vitro experiments showed that administration of an autophagy inhibitor, together with hypoxia activation and 5-FU treatment, promoted apoptosis in HepG2 liver cancer cells and primary HCC cells. Multivariate logistic regression analysis revealed that ASPP2 expression in cancer tissue following TACE is an independent risk factor for HCC recurrence as well as overall survival. Higher levels of ASPP2 expression were notably associated with higher objective responses evaluated via mRECIST. Thus, patients with resectable HCC showing high levels of ASPP2 expression may benefit from neoadjuvant TACE prior to resection. Our study provided a novel biomarker for HCC prognosis following TACE, based on cell survival mechanisms related to autophagy.
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Affiliation(s)
- Jiaren Mao
- Department of Radiology, The People's Hospital of Danyang, Danyang, Jiangsu 212300, P.R. China
| | - Zhongjun Tan
- Department of Radiology, The People's Hospital of Danyang, Danyang, Jiangsu 212300, P.R. China
| | - Xiaoqi Pan
- Department of Radiology, The People's Hospital of Danyang, Danyang, Jiangsu 212300, P.R. China
| | - Feijian Meng
- Department of Radiology, The People's Hospital of Danyang, Danyang, Jiangsu 212300, P.R. China
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12
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Yamashita K, Mizuno K, Furukawa K, Hirose H, Sakurai N, Masuda-Hirata M, Amano Y, Hirose T, Suzuki A, Ohno S. Phosphorylation and dephosphorylation of Ser852 and Ser889 control the clustering, localization and function of PAR3. J Cell Sci 2020; 133:jcs244830. [PMID: 33093242 DOI: 10.1242/jcs.244830] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 09/28/2020] [Indexed: 08/31/2023] Open
Abstract
Cell polarity is essential for various asymmetric cellular events, and the partitioning defective (PAR) protein PAR3 (encoded by PARD3 in mammals) plays a unique role as a cellular landmark to establish polarity. In epithelial cells, PAR3 localizes at the subapical border, such as the tight junction in vertebrates, and functions as an apical determinant. Although we know a great deal about the regulators of PAR3 localization, how PAR3 is concentrated and localized to a specific membrane domain remains an important question to be clarified. In this study, we demonstrate that ASPP2 (also known as TP53BP2), which controls PAR3 localization, links PAR3 and protein phosphatase 1 (PP1). The ASPP2-PP1 complex dephosphorylates a novel phosphorylation site, Ser852, of PAR3. Furthermore, Ser852- or Ser889-unphosphorylatable PAR3 mutants form protein clusters, and ectopically localize to the lateral membrane. Concomitance of clustering and ectopic localization suggests that PAR3 localization is a consequence of local clustering. We also demonstrate that unphosphorylatable forms of PAR3 exhibited a low molecular turnover and failed to coordinate rapid reconstruction of the tight junction, supporting that both the phosphorylated and dephosphorylated states are essential for the functional integrity of PAR3.
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Affiliation(s)
- Kazunari Yamashita
- Department of Molecular Biology, Yokohama City University School of Medicine, Kanazawa-ku, Yokohama 236-0004, Japan
- Department of Molecular and Chemical Life Sciences, Graduate School of Life Sciences, Tohoku University, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - Keiko Mizuno
- Department of Molecular Biology, Yokohama City University School of Medicine, Kanazawa-ku, Yokohama 236-0004, Japan
| | - Kana Furukawa
- Department of Molecular Biology, Yokohama City University School of Medicine, Kanazawa-ku, Yokohama 236-0004, Japan
- Laboratory for Lung Development and Regeneration, RIKEN Center for Biosystems Dynamics Research, Kobe 650-0047, Japan
| | - Hiroko Hirose
- Department of Molecular Biology, Yokohama City University School of Medicine, Kanazawa-ku, Yokohama 236-0004, Japan
| | - Natsuki Sakurai
- Department of Molecular Biology, Yokohama City University School of Medicine, Kanazawa-ku, Yokohama 236-0004, Japan
| | - Maki Masuda-Hirata
- Department of Molecular Biology, Yokohama City University School of Medicine, Kanazawa-ku, Yokohama 236-0004, Japan
| | - Yoshiko Amano
- Department of Molecular Biology, Yokohama City University School of Medicine, Kanazawa-ku, Yokohama 236-0004, Japan
| | - Tomonori Hirose
- Department of Molecular Biology, Yokohama City University School of Medicine, Kanazawa-ku, Yokohama 236-0004, Japan
| | - Atsushi Suzuki
- Department of Molecular Biology, Yokohama City University School of Medicine, Kanazawa-ku, Yokohama 236-0004, Japan
- Molecular Cellular Biology Laboratory, Yokohama City University Graduate School of Medical Life Science, Tsurumi-ku, Yokohama 230-0045, Japan
| | - Shigeo Ohno
- Department of Molecular Biology, Yokohama City University School of Medicine, Kanazawa-ku, Yokohama 236-0004, Japan
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13
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Patel KD, Barasiya YV, Patel JB, Patel PS. Apoptosis stimulating protein of p53 (ASPP) 1 and ASPP2 m-RNA expression in oral cancer. Arch Oral Biol 2020; 119:104920. [PMID: 32987288 DOI: 10.1016/j.archoralbio.2020.104920] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 09/09/2020] [Accepted: 09/09/2020] [Indexed: 12/25/2022]
Abstract
OBJECTIVE The present study was carried out to unfold the clinical significance of apoptosis stimulating protein of p53 (ASPP) 1 and ASPP2 expression in oral cancer (OC). METHODS Tissue specimens (malignant and their corresponding adjacent normal) from 40 pathologically confirmed OC patients treated at the Institute were included in the study. ASPP1 and ASPP2 expression were examined using semi-quantitative RT-PCR. RESULTS The results indicated lower ASPP1 expression in OC tissues as compared to adjacent normal tissues (p = 0.085). Stratified analysis as per tumor site revealed significant down-regulation of ASPP1 in tongue cancer tissues (p = 0.005). Receiver operating characteristic curve depicted significant discriminatory efficacy in distinguishing tongue cancer tissues and adjacent normal tissues (p = 0.019). Moreover, ASPP1 expression was remarkably declined in stage II, III and IV OC tumors than stage I OC tumors (p = 0.007, 0.092 and 0.013, respectively). A similar trend was observed in buccal mucosa tumors on further analysis. ASPP2 expression was lower in moderately differentiated OC tumors as compared to well differentiated OC tumors (p = 0.061). Significantly reduced ASPP2 expression was observed in tongue cancer tumors without invasion in contrast to tumors with perineural invasion (p = 0.007). Besides, ASPP1 and ASPP2 expression was positively inter-correlated in tongue tissues (r = 0.325, p = 0.091). CONCLUSIONS Lower ASPP1 expression in tongue cancer during malignant transformation has significance in cancer initiation. Association of reduced ASPP1 and ASPP2 expression with advanced disease stage and moderate differentiation suggests their role in OC progression. Thus, down-regulation of ASPP1 and ASPP2 may serve as potential diagnostic and prognostic indicators in OC.
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Affiliation(s)
- Kinjal D Patel
- The Gujarat Cancer & Research Institute, Civil Hospital Campus, Asarwa, Ahmedabad, 380 016, Gujarat, India
| | - Yesha V Barasiya
- The Gujarat Cancer & Research Institute, Civil Hospital Campus, Asarwa, Ahmedabad, 380 016, Gujarat, India
| | - Jayendra B Patel
- The Gujarat Cancer & Research Institute, Civil Hospital Campus, Asarwa, Ahmedabad, 380 016, Gujarat, India
| | - Prabhudas S Patel
- The Gujarat Cancer & Research Institute, Civil Hospital Campus, Asarwa, Ahmedabad, 380 016, Gujarat, India.
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14
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Konno T, Kohno T, Okada T, Shimada H, Satohisa S, Kikuchi S, Saito T, Kojima T. ASPP2 suppression promotes malignancy via LSR and YAP in human endometrial cancer. Histochem Cell Biol 2020; 154:197-213. [PMID: 32266459 DOI: 10.1007/s00418-020-01876-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/29/2020] [Indexed: 12/19/2022]
Abstract
Apoptosis-stimulating p53 protein 2 (ASPP2) is an apoptosis inducer that acts via binding with p53 and epithelial polarity molecule PAR3. Lipolysis-stimulated lipoprotein receptor (LSR) is an important molecule at tricellular contacts, and loss of LSR promotes cell migration and invasion via Yes-associated protein (YAP) in human endometrial cancer cells. In the present study, to find how ASPP2 suppression promotes malignancy in human endometrial cancer, we investigated its mechanisms including the relationship with LSR. In endometriosis and endometrial cancers (G1 and G2), ASPP2 was observed as well as PAR3 and LSR in the subapical region. ASPP2 decreased in G3 endometrial cancer compared to G1. In human endometrial cancer cell line Sawano, ASPP2 was colocalized with LSR and tricellulin at tricellular contacts and binding to PAR3, LSR, and tricellulin in the confluent state. ASPP2 suppression promoted cell migration and invasion, decreased LSR expression, and induced expression of phosphorylated YAP, claudin-1, -4, and -7 as effectively as the loss of LSR. Knockdown of YAP prevented the upregulation of pYAP, cell migration and invasion induced by the ASPP2 suppression. Treatment with a specific antibody against ASPP2 downregulated ASPP2 and LSR, affected F-actin at tricellular contacts, upregulated expression of pYAP and claudin-1, and induced cell migration and invasion via YAP. In normal human endometrial epithelial cells, ASPP2 was in part colocalized with LSR at tricellular contacts and knockdown of ASPP2 or LSR induced expression of claudin-1 and claudin-4. ASPP2 suppression promoted cell invasion and migration via LSR and YAP in human endometrial cancer cells.
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15
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Liu L, Wang L, Li X, Tian P, Xu H, Li Z, Liu E. Effect of miR-21 on apoptosis in hepatoblastoma cell through activating ASPP2/p38 signaling pathway in vitro and in vivo. Artif Cells Nanomed Biotechnol 2020; 47:3729-3736. [PMID: 31535570 DOI: 10.1080/21691401.2019.1664561] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The objective of this study was to investigate the mechanism underlying miR-21-associated apoptosis in HB. In this study, HB and adjacent tissues were collected from patients with HB. RT-PCR, FISH, western blot, apoptosis assay, migration, invasion and wound healing assays, caspase activity assay, luciferase reporter assays, and xenografts mouse model were used to determine the effects of miR-21 on HB cell apoptosis. The results revealed that miR-21 was up-regulated in both HB cell and tissue and was associated with progression of HB. MiR-21 inhibitor enhanced the apoptosis level in HB cells. MiR-21 inhibitor showed reduced abilities of migration and invasion. ASPP2 was a target gene of miR-21. Inhibition of ASPP2 increased abilities of migration and invasion in HB cells. Furthermore, miR-21 inhibitor caused increased activity p-38 signaling. In a xenografts mouse model, miR-21 inhibitor could significantly suppress tumor growth in nude mice along with enhanced expressions of ASPP2 and p38. Taken together, the results suggest that upregulation of miR-21 is related to HB progression and miR-21-associated apoptosis in HB is mediated through ASPP2/p38 signaling pathway in vitro and in vivo. This study provides novel insight into the effects of miR-21 on HB apoptosis and clue to develop new therapies.
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Affiliation(s)
- Lili Liu
- Department of Pathology, Linyi People's Hospital , Linyi , China
| | - Likun Wang
- Department of Infectious Diseases, Linyi People's Hospital , Linyi , China
| | - Xidong Li
- Department of Infectious Diseases, Linyi People's Hospital , Linyi , China
| | - Ping Tian
- Department of Infectious Diseases, Linyi People's Hospital , Linyi , China
| | - Hao Xu
- Department of Infectious Diseases, Linyi People's Hospital , Linyi , China
| | - Zenglian Li
- Department of Infectious Diseases, Linyi People's Hospital , Linyi , China
| | - Enqin Liu
- Department of Infectious Diseases, Linyi People's Hospital , Linyi , China
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16
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Wang CH, Li QY, Nie L, Ma J, Yao CJ, Chen FP. LncRNA ANRIL promotes cell proliferation, migration and invasion during acute myeloid leukemia pathogenesis via negatively regulating miR-34a. Int J Biochem Cell Biol 2019; 119:105666. [PMID: 31830533 DOI: 10.1016/j.biocel.2019.105666] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 12/06/2019] [Accepted: 12/07/2019] [Indexed: 12/11/2022]
Abstract
OBJECTIVE LncRNA ANRIL (antisense non-coding RNA in the INK4 locus) was highly expressed in acute myeloid leukemia (AML) patients to promote AML pathogenesis. In this study, we aimed to investigate the roles and molecular events of ANRIL associated with AML progression. METHODS Expression patterns of ANRIL and miR-34a in the bone marrow (BM) samples and cell lines were determined using qRT-PCR. Cell proliferation, apoptosis, migration and invasion of cells with ANRIL knockdown or miR-34a overexpression were assessed by CCK-8, EdU staining, flow cytometry and Transwell assays, respectively. The dual-luciferase reporter assay was employed to validate the relationship between miR-34a and Histone deacetylase 1 (HDAC1). The binding of E2 F1 (E2 F transcription factor 1) with gene promoter was analyzed by ChIP. Furthermore, the tumorigenicity of AML was determined by xenograft transplantation in nude mice. RESULTS ANRIL was up-regulated both in the BM samples from AML patients and cell lines (HL-60 and THP-1), of which expression was negatively correlated with miR-34a expression. ANRIL knockdown inhibited cell proliferation, migration and invasion but promoted apoptosis of AML cells, while overexpression of miR-34a exerted opposite effects. miR-34a was verified as a downstream gene targeted by ANRIL. Moreover, HDAC1 was a direct target of miR-34a, and HDAC1 overexpression impaired the recruitment of E2 F1 to ASPP2 (apoptosis stimulating proteins of p53) gene promoter. ANRIL knockdown significantly inhibited the tumorigenesis of AML. CONCLUSION ANRIL promotes AML development through HDAC1-mediated epigenetic suppression of ASPP2 via negatively regulating miR-34a, which might serve as a therapeutic target for AML treatment.
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Affiliation(s)
- Cheng-Hong Wang
- Department of Hematology, Xiangya Third Hospital, Central South University, Changsha 410013, PR China
| | - Qian-Yuan Li
- Department of Hematology, Xiangya Third Hospital, Central South University, Changsha 410013, PR China
| | - Lu Nie
- Department of Hematology, Xiangya Third Hospital, Central South University, Changsha 410013, PR China
| | - Jie Ma
- Department of Hematology, Xiangya Third Hospital, Central South University, Changsha 410013, PR China
| | - Chen-Jiao Yao
- Department of Hematology, Xiangya Third Hospital, Central South University, Changsha 410013, PR China
| | - Fang-Ping Chen
- Department of Hematology, Xiangya Third Hospital, Central South University, Changsha 410013, PR China.
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17
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Kaplan N, Dong Y, Wang S, Yang W, Park JK, Wang J, Fiolek E, Perez White B, Chandel NS, Peng H, Lavker RM. FIH-1 engages novel binding partners to positively influence epithelial proliferation via p63. FASEB J 2019; 34:525-539. [PMID: 31914679 DOI: 10.1096/fj.201901512r] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 10/07/2019] [Accepted: 10/15/2019] [Indexed: 12/19/2022]
Abstract
Whereas much is known about the genes regulated by ΔNp63α in keratinocytes, how ΔNp63α is regulated is less clear. During studies with the hydroxylase, factor inhibiting hypoxia-inducible factor 1 (FIH-1), we observed increases in epidermal ΔNp63α expression along with proliferative capacity in a conditional FIH-1 transgenic mouse. Conversely, loss of FIH-1 in vivo and in vitro attenuated ΔNp63α expression. To elucidate the FIH-1/p63 relationship, BioID proteomics assays identified FIH-1 binding partners that had the potential to regulate p63 expression. FIH-1 interacts with two previously unknown partners, Plectin1 and signal transducer and activator of transcription 1 (STAT1) leading to the regulation of ΔNp63α expression. Two known interactors of FIH-1, apoptosis-stimulating of P53 protein 2 (ASPP2) and histone deacetylase 1 (HDAC1), were also identified. Knockdown of ASPP2 upregulated ΔNp63α and reversed the decrease in ΔNp63α by FIH-1 depletion. Additionally, FIH-1 regulates growth arrest and DNA damage-45 alpha (GADD45α), a negative regulator of ΔNp63α by interacting with HDAC1. GADD45α knockdown rescued reduction in ΔNp63α by FIH-1 depletion. Collectively, our data reveal that FIH-1 positively regulates ΔNp63α in keratinocytes via variety of signaling partners: (a) Plectin1/STAT1, (b) ASPP2, and (c) HDAC1/GADD45α signaling pathways.
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Affiliation(s)
- Nihal Kaplan
- Department of Dermatology, Northwestern University, Chicago, IL, USA
| | - Ying Dong
- Department of Dermatology, Northwestern University, Chicago, IL, USA.,Department of Ophthalmology, The First Affiliated Hospital, Chinese PLA General Hospital, Beijing, China
| | - Sijia Wang
- Department of Dermatology, Northwestern University, Chicago, IL, USA.,Department of Dermatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Wending Yang
- Department of Dermatology, Northwestern University, Chicago, IL, USA
| | - Jong Kook Park
- Department of Dermatology, Northwestern University, Chicago, IL, USA.,Department of Biomedical Science, College of Natural Sciences #8403, Hallym University, Chuncheon, Republic of Korea
| | - Junyi Wang
- Department of Dermatology, Northwestern University, Chicago, IL, USA.,Department of Ophthalmology, The First Affiliated Hospital, Chinese PLA General Hospital, Beijing, China
| | - Elaina Fiolek
- Department of Dermatology, Northwestern University, Chicago, IL, USA
| | | | | | - Han Peng
- Department of Dermatology, Northwestern University, Chicago, IL, USA
| | - Robert M Lavker
- Department of Dermatology, Northwestern University, Chicago, IL, USA
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18
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Konno T, Kohno T, Kikuchi S, Shimada H, Satohisa S, Takano K, Saito T, Kojima T. Localization of Tricellular Tight Junction Molecule LSR at Midbody and Centrosome During Cytokinesis in Human Epithelial Cells. J Histochem Cytochem 2019; 68:59-72. [PMID: 31662022 DOI: 10.1369/0022155419886263] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Epithelial integrity and barrier function are maintained during cytokinesis in vertebrate epithelial tissues. The changes in localization and the roles of tricellular tight junction molecule lipolysis-stimulated lipoprotein receptor (LSR) during cytokinesis are not well known, although new tricellular tight junctions form at the flank of the midbody during cytokinesis. In this study, we investigated the changes in localization and the role of LSR at the midbody and centrosome during cytokinesis using human endometrial carcinoma cell line Sawano, comparing the tricellular tight junction molecule tricellulin; bicellular tight junction molecules occludin, claudin-7, zonula occludens-1, and cingulin; and the epithelial polarized related molecules apoptosis-stimulating of p53 protein 2, PAR3, and yes-associated protein. During cytokinesis induced by treatment with taxol, the epithelial barrier was maintained and the tricellular tight junction molecules LSR and tricellulin were concentrated at the flank of the acetylated tubulin-positive midbody and in γ-tubulin-positive centrosomes with the dynein adaptor Hook2, whereas the other molecules were localized there as well. All the molecules disappeared by knockdown using small interfering RNAs. Furthermore, by the knockdown of Hook2, the epithelial barrier was maintained and most of the molecules disappeared from the centrosome. These findings suggest that LSR may play crucial roles not only in barrier function but also in cytokinesis.
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Affiliation(s)
- Takumi Konno
- Department of Cell Science, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Takayuki Kohno
- Department of Cell Science, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Shin Kikuchi
- Department of Anatomy, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Hiroshi Shimada
- Department of Cell Science, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan.,Department of Obstetrics and Gynecology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Seiro Satohisa
- Department of Obstetrics and Gynecology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Kenichi Takano
- Department of Otolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Tsuyoshi Saito
- Department of Obstetrics and Gynecology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Takashi Kojima
- Department of Cell Science, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
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Zhou Y, Millott R, Kim HJ, Peng S, Edwards RA, Skene-Arnold T, Hammel M, Lees-Miller SP, Tainer JA, Holmes CFB, Glover JNM. Flexible Tethering of ASPP Proteins Facilitates PP-1c Catalysis. Structure 2019; 27:1485-1496.e4. [PMID: 31402222 DOI: 10.1016/j.str.2019.07.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 06/14/2019] [Accepted: 07/22/2019] [Indexed: 12/15/2022]
Abstract
ASPP (apoptosis-stimulating proteins of p53) proteins bind PP-1c (protein phosphatase 1) and regulate p53 impacting cancer cell growth and apoptosis. Here we determine the crystal structure of the oncogenic ASPP protein, iASPP, bound to PP-1c. The structure reveals a 1:1 complex that relies on interactions of the iASPP SILK and RVxF motifs with PP-1c, plus interactions of the PP-1c PxxPxR motif with the iASPP SH3 domain. Small-angle X-ray scattering analyses suggest that the crystal structure undergoes slow interconversion with more extended conformations in solution. We show that iASPP, and the tumor suppressor ASPP2, enhance the catalytic activity of PP-1c against the small-molecule substrate, pNPP as well as p53. The combined results suggest that PxxPxR binding to iASPP SH3 domain is critical for complex formation, and that the modular ASPP-PP-1c interface provides dynamic flexibility that enables functional binding and dephosphorylation of p53 and other diverse protein substrates.
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Affiliation(s)
- Yeyun Zhou
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2H7, Canada
| | - Robyn Millott
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2H7, Canada
| | - Hyeong Jin Kim
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2H7, Canada
| | - Shiyun Peng
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2H7, Canada
| | - Ross A Edwards
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2H7, Canada
| | - Tamara Skene-Arnold
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2H7, Canada
| | - Michal Hammel
- Molecular Biophysics & Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Susan P Lees-Miller
- Department of Biochemistry and Molecular Biology, Arnie Charbonneau Cancer Institute, University of Calgary, Calgary, AB, Canada
| | - John A Tainer
- Molecular Biophysics & Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; Department of Molecular and Cellular Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, TX 77030, USA
| | - Charles F B Holmes
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2H7, Canada.
| | - J N Mark Glover
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2H7, Canada.
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Junaid M, Li CD, Shah M, Khan A, Guo H, Wei DQ. Extraction of molecular features for the drug discovery targeting protein-protein interaction of Helicobacter pylori CagA and tumor suppressor protein ASSP2. Proteins 2019; 87:837-849. [PMID: 31134671 DOI: 10.1002/prot.25748] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 05/04/2019] [Accepted: 05/22/2019] [Indexed: 12/13/2022]
Abstract
Half of the world population is infected by the Gram-negative bacterium Helicobacter pylori (H. pylori). It colonizes in the stomach and is associated with severe gastric pathologies including gastric cancer and peptic ulceration. The most virulent factor of H. pylori is the cytotoxin-associated gene A (CagA) that is injected into the host cell. CagA interacts with several host proteins and alters their function, thereby causing several diseases. The most well-known target of CagA is the tumor suppressor protein ASPP2. The subdomain I at the N-terminus of CagA interacts with the proline-rich motif of ASPP2. Here, in this study, we carried out alanine scanning mutagenesis and an extensive molecular dynamics simulation summing up to 3.8 μs to find out hot spot residues and discovered some new protein-protein interaction (PPI)-modulating molecules. Our findings are in line with previous biochemical studies and further suggested new residues that are crucial for binding. The alanine scanning showed that mutation of Y207 and T211 residues to alanine decreased the binding affinity. Likewise, dynamics simulation and molecular mechanics with generalized Born surface area (MMGBSA) analysis also showed the importance of these two residues at the interface. A four-feature pharmacophore model was developed based on these two residues, and top 10 molecules were filtered from ZINC, NCI, and ChEMBL databases. The good binding affinity of the CHEMBL17319 and CHEMBL1183979 molecules shows the reliability of our adopted protocol for binding hot spot residues. We believe that our study provides a new insight for using CagA as the therapeutic target for gastric cancer treatment and provides a platform for a future experimental study.
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Affiliation(s)
- Muhammad Junaid
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Cheng-Dong Li
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Masaud Shah
- Department of Molecular Science and Technology, Ajou University, Suwon, South Korea
| | - Abbas Khan
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Haoyue Guo
- Department of Physiology, McGill University, Montreal, Quebec, Canada
| | - Dong-Qing Wei
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
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Schittenhelm MM, Walter B, Tsintari V, Federmann B, Bajrami Saipi M, Akmut F, Illing B, Mau-Holzmann U, Fend F, Lopez CD, Kampa-Schittenhelm KM. Alternative splicing of the tumor suppressor ASPP2 results in a stress-inducible, oncogenic isoform prevalent in acute leukemia. EBioMedicine 2019; 42:340-351. [PMID: 30952616 PMCID: PMC6491939 DOI: 10.1016/j.ebiom.2019.03.028] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 03/10/2019] [Accepted: 03/11/2019] [Indexed: 01/01/2023] Open
Abstract
Background Apoptosis-stimulating Protein of TP53-2 (ASPP2) is a tumor suppressor enhancing TP53-mediated apoptosis via binding to the TP53 core domain. TP53 mutations found in cancers disrupt ASPP2 binding, arguing for an important role of ASPP2 in TP53-mediated tumor suppression. We now identify an oncogenic splicing variant, ASPP2κ, with high prevalence in acute leukemia. Methods An mRNA screen to detect ASPP2 splicing variants was performed and ASPP2κ was validated using isoform-specific PCR approaches. Translation into a genuine protein isoform was evaluated after establishing epitope-specific antibodies. For functional studies cell models with forced expression of ASPP2κ or isoform-specific ASPP2κ-interference were created to evaluate proliferative, apoptotic and oncogenic characteristics of ASPP2κ. Findings Exon skipping generates a premature stop codon, leading to a truncated C-terminus, omitting the TP53-binding sites. ASPP2κ translates into a dominant-negative protein variant impairing TP53-dependent induction of apoptosis. ASPP2κ is expressed in CD34+ leukemic progenitor cells and functional studies argue for a role in early oncogenesis, resulting in perturbed proliferation and impaired induction of apoptosis, mitotic failure and chromosomal instability (CIN) – similar to TP53 mutations. Importantly, as expression of ASPP2κ is stress-inducible it defines a novel class of dynamic oncogenes not represented by genomic mutations. Interpretation Our data demonstrates that ASPP2κ plays a distinctive role as an antiapoptotic regulator of the TP53 checkpoint, rendering cells to a more aggressive phenotype as evidenced by proliferation and apoptosis rates – and ASPP2κ expression results in acquisition of genomic mutations, a first initiating step in leukemogenesis. We provide proof-of-concept to establish ASPP2κ as a clinically relevant biomarker and a target for molecule-defined therapy. Fund Unrestricted grant support from the Wilhelm Sander Foundation for Cancer Research, the IZKF Program of the Medical Faculty Tübingen, the Brigitte Schlieben-Lange Program and the Margarete von Wrangell Program of the State Ministry Baden-Wuerttemberg for Science, Research and Arts and the Athene Program of the excellence initiative of the Eberhard-Karls University, Tübingen.
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Affiliation(s)
- Marcus Matthias Schittenhelm
- Department of Oncology, Hematology, Rheumatology, Immunology and Pulmology, University Hospital Tübingen, Germany
| | - Bianca Walter
- Department of Oncology, Hematology, Rheumatology, Immunology and Pulmology, University Hospital Tübingen, Germany
| | - Vasileia Tsintari
- Department of Oncology, Hematology, Rheumatology, Immunology and Pulmology, University Hospital Tübingen, Germany
| | - Birgit Federmann
- Institute of General and Molecular Pathology and Pathological Anatomy, University Hospital Tübingen, Germany
| | - Mihada Bajrami Saipi
- Department of Oncology, Hematology, Rheumatology, Immunology and Pulmology, University Hospital Tübingen, Germany
| | - Figen Akmut
- Department of Oncology, Hematology, Rheumatology, Immunology and Pulmology, University Hospital Tübingen, Germany
| | - Barbara Illing
- Department of Oncology, Hematology, Rheumatology, Immunology and Pulmology, University Hospital Tübingen, Germany
| | | | - Falko Fend
- Institute of General and Molecular Pathology and Pathological Anatomy, University Hospital Tübingen, Germany
| | - Charles Darin Lopez
- Department of Hematology and Medical Oncology, Oregon Health and Science University, Portland, OR, United States of America
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22
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Yang T, Gao Y, Liu D, Wang Y, Wu J, Liu X, Shi Y, Chen D. ASPP2 enhances chemotherapeutic sensitivity through the down-regulation of XIAP expression in a p53 independent manner in hepatocellular carcinoma. Biochem Biophys Res Commun 2018; 508:769-774. [PMID: 30528232 DOI: 10.1016/j.bbrc.2018.11.181] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 11/20/2018] [Accepted: 11/28/2018] [Indexed: 12/30/2022]
Abstract
Apoptosis stimulated protein of p53-2 (ASPP2) induces the transcription of p53-targeted genes to stimulates its pro-apoptosis function. The poor chemotherapeutic sensitivity is associated with the decreased ASPP2 expression in many human cancers. Here, multiple genes real-time RT-PCR array and western blotting analysis show that ASPP2 suppress the expression of X-linked inhibitor of apoptosis protein (XIAP), determinant of chemoresistance in cancer, in hepatocellular carcinoma (HCC) in a p53-independent manner. Further experiments with ASPP2-rAd and ASPP2-Lv confirmed that ASPP2 enhanced sensitivity of sorafenib to HCC via suppressing XIAP expression. XIAP mainly found on the cytoplasm and perinuclear areas of ASPP2 over-expressed HepG2 cells, while both cytoplasm and nucleus in ASPP2 shut down HepG2 cells. The association of poor sensitivity of sorafenib and XIAP expression was also found both in ASPP2 shut down and overexpress mice, where liver tissue with decreased or increased ASPP2 displayed less or more apoptosis, respectively. Finally, ASPP2 and XIAP expression analyzed in 43 hepatocellular carcinoma tumors and 44 adjacent normal tissues from 38 hepatocellular carcinoma patients for fully understand their expression within HCC patients. Compared with the tumor tissues, ASPP2 mRNA levels were increased, and XIAP levels decreased in the adjacent normal tissues. Taken together, XIAP suppressed ASPP2 increased tumor sensitivity to chemotherapy in a p53-independent manner, which was associated with chemotherapy resistance, suggesting that p53 activation and XIAP suppression were two independent ways that ASPP2 enhance the sensitivity of chemotherapy.
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Affiliation(s)
- Tongwang Yang
- Beijing Youan Hospital, Beijing Institute of Hepatology, Capital Medical University, Beijing, 100069, China; Organ Transplantation Center, The Affiliated Hospital of Qingdao University, Qingdao City, 266003, China
| | - Yuxue Gao
- Beijing Youan Hospital, Beijing Institute of Hepatology, Capital Medical University, Beijing, 100069, China; Organ Transplantation Center, The Affiliated Hospital of Qingdao University, Qingdao City, 266003, China
| | - Daojie Liu
- Department of Clinical Laboratory, Haidian Maternal&Child Health Hospital, 100080, Beijing, China
| | - Yang Wang
- Beijing Youan Hospital, Beijing Institute of Hepatology, Capital Medical University, Beijing, 100069, China; Organ Transplantation Center, The Affiliated Hospital of Qingdao University, Qingdao City, 266003, China
| | - Jing Wu
- Beijing Youan Hospital, Beijing Institute of Hepatology, Capital Medical University, Beijing, 100069, China
| | - Xiaoni Liu
- Beijing Youan Hospital, Beijing Institute of Hepatology, Capital Medical University, Beijing, 100069, China
| | - Ying Shi
- Beijing Youan Hospital, Beijing Institute of Hepatology, Capital Medical University, Beijing, 100069, China
| | - Dexi Chen
- Beijing Youan Hospital, Beijing Institute of Hepatology, Capital Medical University, Beijing, 100069, China; Organ Transplantation Center, The Affiliated Hospital of Qingdao University, Qingdao City, 266003, China.
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23
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Junaid M, Shah M, Khan A, Li CD, Khan MT, Kaushik AC, Ali A, Mehmood A, Nangraj AS, Choi S, Wei DQ. Structural-dynamic insights into the H. pylori cytotoxin-associated gene A (CagA) and its abrogation to interact with the tumor suppressor protein ASPP2 using decoy peptides. J Biomol Struct Dyn 2018; 37:4035-4050. [PMID: 30328798 DOI: 10.1080/07391102.2018.1537895] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Helicobacter pylori (H. pylori) is one of the most extensively studied Gram-negative bacteria due to its implication in gastric cancer. The oncogenicity of H. pylori is associated with cytotoxin-associated gene A (CagA), which is injected into epithelial cells lining the stomach. Both the C- and N-termini of CagA are involved in the interaction with several host proteins, thereby disrupting vital cellular functions, such as cell adhesion, cell cycle, intracellular signal transduction, and cytoskeletal structure. The N-terminus of CagA interacts with the tumor-suppressing protein, apoptosis-stimulating protein of p53 (ASPP2), subsequently disrupting the apoptotic function of tumor suppressor gene p53. Here, we present the in-depth molecular dynamic mechanism of the CagA-ASPP2 interaction and highlight hot-spot residues through in silico mutagenesis. Our findings are in agreement with previous studies and further suggest other residues that are crucial for the CagA-ASPP2 interaction. Furthermore, the ASPP2-binding pocket possesses potential druggability and could be engaged by decoy peptides, identified through a machine-learning system and suggested in this study. The binding affinities of these peptides with CagA were monitored through extensive computational procedures and reported herein. While CagA is crucial for the oncogenicity of H. pylori, our designed peptides possess the potential to inhibit CagA and restore the tumor suppressor function of ASPP2.
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Affiliation(s)
- Muhammad Junaid
- a State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University , Shanghai , China
| | - Masaud Shah
- b Department of Molecular Science and Technology, Ajou University , Suwon , South Korea
| | - Abbas Khan
- a State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University , Shanghai , China
| | - Cheng-Dong Li
- a State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University , Shanghai , China
| | - Muhammad Tahir Khan
- a State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University , Shanghai , China
| | - Aman Chandra Kaushik
- a State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University , Shanghai , China
| | - Arif Ali
- a State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University , Shanghai , China
| | - Aamir Mehmood
- a State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University , Shanghai , China
| | - Asma Sindhoo Nangraj
- a State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University , Shanghai , China
| | - Sangdun Choi
- b Department of Molecular Science and Technology, Ajou University , Suwon , South Korea
| | - Dong-Qing Wei
- a State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University , Shanghai , China
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Zhou B, Wang D, Sun G, Mei F, Cui Y, Xu H. Effect of miR-21 on Apoptosis in Lung Cancer Cell Through Inhibiting the PI3K/ Akt/NF-κB Signaling Pathway in Vitro and in Vivo. Cell Physiol Biochem 2018; 46:999-1008. [PMID: 29669316 DOI: 10.1159/000488831] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 03/05/2018] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS Lung cancer is one of the most common malignancies in the world. Apoptosis-stimulating protein of p53 (ASPP2), a tumorigenesis related protein, plays a critical role in the initiation and development of various types of cancers. However, the effect of ASPP2 on lung cancer remains unknown. The purpose of this study aims to investigate the mechanism of ASPP2 regulated by miR-21 in lung cancer in vitro and in vivo. METHODS In the study, migration and invasion assays, apoptosis assay, caspase activity assay, TUNEL staining, real time PCR and western blot were used to investigate the mechanism of ASPP2 regulated by miR-21 in lung cancer in vitro and in vivo. RESULTS We demonstrated that the miR-21 inhibitor induced apoptosis through inhibiting the PI3K/Akt/NF-κB signaling pathway in non-small cell lung carcinoma (NSCLC). Moreover, ASPP2 was directly targeted by miR-21 in NSCLC cells. Down-regulation of miR-21 suppressed cell migration and invasion, as well as the EMT signaling pathway in NSCLC cells. Furthermore, the miR-21 inhibitor induced cell apoptosis via the caspase dependent pathway in NSCLC cells. The miR-21 inhibitor enhanced caspase-3, 8, 9 activity in NSCLC cells. In addition, the caspase inhibitor significantly reduced the apoptosis induced by the miR-21 inhibitor in NSCLC cells. CONCLUSIONS Our results revealed that the miR-21 inhibitor could induce apoptosis through inhibiting the PI3K/Akt/NF-κB signaling pathway in human NSCLC cells, and might serve as a therapeutic strategy to treat NSCLC.
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Affiliation(s)
- Bing Zhou
- Department of Cardiothoracic Surgery, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, China
| | - Dimin Wang
- School of Pharmacy, Second Military Medical University, Shanghai, China
| | - Gaozhong Sun
- Department of Cardiothoracic Surgery, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, China
| | - Fuyang Mei
- Department of Cardiothoracic Surgery, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, China
| | - Yong Cui
- Department of Cardiothoracic Surgery, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, China
| | - Heyun Xu
- Department of Cardiothoracic Surgery, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, China
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Liu B, Yang L, Li XJ, Li R, Sun W, Chen XY, Liu JC. Expression and significance of ASPP2 in squamous carcinoma of esophagus. Kaohsiung J Med Sci 2018; 34:321-329. [PMID: 29747775 DOI: 10.1016/j.kjms.2017.12.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 12/18/2017] [Accepted: 12/27/2017] [Indexed: 11/18/2022] Open
Abstract
To study the significance of apoptosis stimulating protein of P53 2 (ASPP2) expression in esophageal squamous cell carcinoma (ESCC), immunohistochemistry S-P method was used to examine the expression of ASPP2 in 136 cases of ESCC, 35 cases of high grade intraepithelial neoplasia (HGIN), 29 cases of low grade intraepithelial neoplasia (LGIN) and 37 cases of normal esophageal epithelium (NEE). The associations of ASPP2 expression with clinicopathological data and overall survival (OS) were also analyzed. Quantitative real-time polymerase chain reaction (qRT-PCR) was performed to evaluate ASPP2 expression in a total of 20 matched human ESCC tumor tissues and normal adjacent tissues (NAT). In addition, EC109 cells were treated with cisplatin (CDDP) in vitro for 24 h (the intervention group) and the control group was set up at the same time. Western blot was used to examine the expression of ASPP2 protein between the two groups. The expression of ASPP2 decreased progressively from NEE to LGIN, to HGIN, and to ESCC, and it was related to TNM stage, histological differentiation and lymph node metastasis in ESCC (P < 0.05). ASPP2 was a protective factor of patients with ESCC (P = 0.008). The relative expression of ASPP2 mRNA was markedly downregulated in ESCC compared with the paired NAT (P < 0.01). Western blot results showed that cells in the intervention group could express ASPP2 while there was no expression of ASPP2 in the control group. Taken together, these results indicate that the abnormal expression of ASPP2 may play an important role for development and metastasis in ESCC.
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Affiliation(s)
- Bo Liu
- Department of Pathology, The First Affiliated Hospital of Hebei North University, Zhangjiakou, China.
| | - Lv Yang
- Department of Histology and Embryology, Hebei North University, Zhangjiakou, China
| | - Xiu-Juan Li
- Department of Histology and Embryology, Hebei North University, Zhangjiakou, China
| | - Rou Li
- Department of Histology and Embryology, Hebei North University, Zhangjiakou, China
| | - Wei Sun
- Department of Histology and Embryology, Hebei North University, Zhangjiakou, China
| | - Xiao-Yi Chen
- Department of Histology and Embryology, Hebei North University, Zhangjiakou, China
| | - Jun-Chao Liu
- Department of Pathology, The First Affiliated Hospital of Hebei North University, Zhangjiakou, China
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Lin M, Chang Y, Xie F, Shi Y, Pang L, Chen D. ASPP2 Inhibits the Profibrotic Effects of Transforming Growth Factor-β1 in Hepatic Stellate Cells by Reducing Autophagy. Dig Dis Sci 2018; 63:146-154. [PMID: 29196956 PMCID: PMC5760593 DOI: 10.1007/s10620-017-4816-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 10/19/2017] [Indexed: 01/06/2023]
Abstract
BACKGROUND Apoptosis-stimulating protein of p53-2 (ASPP2) is a damage-inducible P53-binding protein that enhances damage-induced apoptosis. Fibrosis is a wound-healing response, and hepatic stellate cells (HSCs) are key players in liver fibrogenesis. However, little is known about the relationship between ASPP2 and hepatic fibrosis. AIMS We investigated the effects of ASPP2 overexpression in HSCs and the role of ASPP2 in mouse liver fibrogenesis. METHODS Human HSCs (LX-2 cells) were pre-incubated with GFP adenovirus (Ad) or ASPP2 adenovirus (AdASPP2) for 24 h and then treated with or without TGF-β1. ASPP2+/- and ASPP2+/+ Balb/c mice were used to examine the effects of ASPP2 on liver fibrosis in vivo. ASPP2+/+ Balb/c mice were generated by injecting AdASPP2 into the tail vein of ASPP2 WT Balb/c mice; all mice received intraperitoneal injections of carbon tetrachloride. RESULTS In this study, ASPP2 was found to markedly inhibit TGF-β1-induced fibrogenic activation of LX-2 cells. Further experiments using an autophagic flux assay confirmed that ASPP2 reduced the fibrogenic activation of LX-2 cells by inhibiting autophagy. Moreover, we found that ASPP2 overexpression attenuated the anti-apoptotic effects of TGF-β1 in LX-2 cells. The extent of liver fibrosis was markedly reduced in ASPP2+/+ mouse liver tissue compared with control mice; however, in ASPP2+/- mice, hepatic collagen deposition was significantly increased. CONCLUSION These results suggest that TGF-β1-induced autophagy is required for the fibrogenic response in LX-2 cells and that ASPP2 may both inhibit TGF-β1-induced autophagy and decrease liver fibrosis.
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Affiliation(s)
- Minghua Lin
- Beijing Youan Hospital, Beijing Institute of Hepatology, Capital Medical University, Beijing, 100069, China
| | - Yuan Chang
- Beijing Youan Hospital, Beijing Institute of Hepatology, Capital Medical University, Beijing, 100069, China
| | - Fang Xie
- Beijing Youan Hospital, Beijing Institute of Hepatology, Capital Medical University, Beijing, 100069, China
| | - Ying Shi
- Beijing Youan Hospital, Beijing Institute of Hepatology, Capital Medical University, Beijing, 100069, China
| | - Lijun Pang
- Beijing Youan Hospital, Beijing Institute of Hepatology, Capital Medical University, Beijing, 100069, China
| | - Dexi Chen
- Beijing Youan Hospital, Beijing Institute of Hepatology, Capital Medical University, Beijing, 100069, China.
- Organ Transplantation Center, The Affiliated Hospital of Qingdao University, Qingdao City, 266003, Shandong Province, China.
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27
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Huang W, Li X, Cai L. Effects of ASPP2 on proliferation and apoptosis of malignant spinal tumor cells. Int J Clin Exp Pathol 2017; 10:8023-8030. [PMID: 31966654 PMCID: PMC6965233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Accepted: 12/27/2016] [Indexed: 06/10/2023]
Abstract
Malignant spinal tumors have rapid progression and destruct spines or other tissues, leading to metastasis of peripheral organs, causing high difficulty for surgery, recurrence and worse prognosis, thus severely affecting patient life quality and survival period. Apoptosis stimulating protein 2 of p53 (ASSP2) is one member of p53 binding protein family pro-apoptotic member, and can enhance apoptotic activity via modulating p53 pathway. Previous study found critical roles of ASPP2 in occurrence and progression of tumors, whilst the functional role of mechanism of ASPP2 on malignant spinal tumor cells has not been illustrated. Malignant spinal tumor tissue and adjacent tissues were collected for testing ASPP2 mRNA and protein expression in real-time PCR and Western blot. ASPP2 over-expression vector was used to transfect tumor cells, whilst MTT assay was employed for tumor proliferation, followed by p53 expression in Western blot. Caspase 3 activity assay was employed for testing the effect on cell apoptosis. Flow cytometry was employed for tumor cell apoptosis. Real-time PCR tested expressional change of Bcl2 and Bax. ASPP2 mRNA/protein level was significantly depressed in malignant spinal tumor tissues (P<0.05 compared to adjacent tissues). ASPP2-overexpression vector transfection tumor cells increased apoptosis and inhibited proliferation, accompanied with lower Bcl-2, higher Bax, Caspase 3 and p53 (P<0.05 compared to control group). ASPP2 is down-regulated in malignant spinal tumor tissues. ASPP2 can inhibit malignant spinal tumor cell proliferation via mediating p53 expression for cell apoptosis, thus can work as one molecular target for tumor diagnosis and prognostic analysis.
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Affiliation(s)
- Wei Huang
- Department of Orthopedics, Zhongnan Hospital of Wuhan University, Wuhan UniversityWuhan, Hubei, China
| | - Xinzhi Li
- Department of Orthopedics, Renhe Hospital of Three Gorges UniversityYichang, Hubei, China
| | - Lin Cai
- Department of Orthopedics, Zhongnan Hospital of Wuhan University, Wuhan UniversityWuhan, Hubei, China
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Gen Y, Yasui K, Kitaichi T, Iwai N, Terasaki K, Dohi O, Hashimoto H, Fukui H, Inada Y, Fukui A, Jo M, Moriguchi M, Nishikawa T, Umemura A, Yamaguchi K, Konishi H, Naito Y, Itoh Y. ASPP2 suppresses invasion and TGF-β1-induced epithelial-mesenchymal transition by inhibiting Smad7 degradation mediated by E3 ubiquitin ligase ITCH in gastric cancer. Cancer Lett 2017; 398:52-61. [PMID: 28400336 DOI: 10.1016/j.canlet.2017.04.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 03/21/2017] [Accepted: 04/02/2017] [Indexed: 12/12/2022]
Abstract
ASPP2 regulates cell polarity and cell-cell adhesion by binding to, and co-localizing with PAR3 at tight junctions. Here we show a novel role of ASPP2 in suppressing gastric cancer (GC) invasiveness. Immunoprecipitation and immunofluorescence analyses showed that ASPP2 promoted the recruitment of PAR3 to cell-cell junctions in GC cells. Diminished expression of ASPP2 and loss of junctional PAR3 localization were significantly associated with diffuse-type histology, deeper invasion depth, positive peritoneal dissemination and worse prognosis in primary GC. ASPP2 suppressed migration and invasion of GC cells in vitro and peritoneal dissemination of GC cells in vivo in a mouse model. ASPP2 suppressed epithelial-mesenchymal transition (EMT) induced by TGF-β1-Smad2/3 signaling in GC cells through suppression of the degradation of Smad7, a negative regulator of TGF-β1-Smad2/3 signaling, by interacting with the E3 ubiquitin ligase ITCH. In conclusion, ASPP2 suppresses invasion, peritoneal dissemination and TGF-β1-induced EMT by inhibiting Smad7 degradation mediated by ITCH.
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Affiliation(s)
- Yasuyuki Gen
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan; Department of Molecular Cytogenetics, Medical Research Institute and Graduate School of Medical and Dental Science, Tokyo Medical and Dental University, Tokyo, Japan
| | - Kohichiroh Yasui
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
| | - Tomoko Kitaichi
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Naoto Iwai
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Kei Terasaki
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Osamu Dohi
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hikaru Hashimoto
- Department of Gastroenterology and Hepatology, North Medical Center Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hayato Fukui
- Department of Gastroenterology and Hepatology, North Medical Center Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Yutaka Inada
- Department of Gastroenterology and Hepatology, North Medical Center Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Akifumi Fukui
- Department of Gastroenterology and Hepatology, North Medical Center Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Masayasu Jo
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Michihisa Moriguchi
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Taichiro Nishikawa
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Atushi Umemura
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Kanji Yamaguchi
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hiroyuki Konishi
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Yuji Naito
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Yoshito Itoh
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
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Liu Z, Qiao L, Zhang Y, Zang Y, Shi Y, Liu K, Zhang X, Lu X, Yuan L, Su B, Zhang T, Wu H, Chen D. ASPP2 Plays a Dual Role in gp120-Induced Autophagy and Apoptosis of Neuroblastoma Cells. Front Neurosci 2017; 11:150. [PMID: 28392757 PMCID: PMC5364170 DOI: 10.3389/fnins.2017.00150] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Accepted: 03/09/2017] [Indexed: 02/02/2023] Open
Abstract
HIV invasion of the central nervous system (CNS) in the majority of patients infected with HIV-1, leads to dysfunction and injury within the CNS, showing a variety of neurological symptoms which was broadly termed HIV-associated neurocognitive disorder (HAND). But the molecular mechanisms are not completely understood. It has been suggested that apoptosis and autophagic dysfunction in neurons may play an important role in the development of HAND. Previous studies have indicated that p53 may be involved in the onset of neurological disorder in AIDS. Apoptosis-stimulating protein of p53-2 (ASPP2), a p53-binding protein with specific function of inducing p53, has been reported to modulate autophagy. In the present study, we observed that gp120 induces autophagy and apoptosis in SH-SY5Y neuroblastoma cells. Adenovirus-mediated overexpression of ASPP2 significantly inhibited autophagy and apoptosis induced by low dose of gp120 protein (50 ng/mL), but induced autophagy and apoptosis when treated by high dose of gp120 protein (200 ng/mL). Further, ASPP2 knockdown attenuated autophagy and apoptosis induced by gp120. Conclusion: ASPP2 had different effects on the autophagy and apoptosis of neurons induced by different concentration of gp120 protein. It may be a potential therapeutic agent for HAND through modulating autophagy and apoptosis in CNS.
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Affiliation(s)
- Zhiying Liu
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical UniversityBeijing, China; Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical UniversityBeijing, China
| | - Luxin Qiao
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University Beijing, China
| | - Yulin Zhang
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University Beijing, China
| | - Yunjing Zang
- Organ Transplantation Center, The Affiliated Hospital of Qingdao University Qingdao, China
| | - Ying Shi
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University Beijing, China
| | - Kai Liu
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University Beijing, China
| | - Xin Zhang
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University Beijing, China
| | - Xiaofan Lu
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University Beijing, China
| | - Lin Yuan
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University Beijing, China
| | - Bin Su
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University Beijing, China
| | - Tong Zhang
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University Beijing, China
| | - Hao Wu
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University Beijing, China
| | - Dexi Chen
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical UniversityBeijing, China; Organ Transplantation Center, The Affiliated Hospital of Qingdao UniversityQingdao, China
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Liu X, Wang S, Guo X, Wei F, Yin J, Zang Y, Li N, Chen D. Exogenous p53 and ASPP2 expression enhances rAdV-TK/ GCV-induced death in hepatocellular carcinoma cells lacking functional p53. Oncotarget 2017; 7:18896-905. [PMID: 26934443 PMCID: PMC4951338 DOI: 10.18632/oncotarget.7749] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 01/13/2016] [Indexed: 12/13/2022] Open
Abstract
Suicide gene therapy using herpes simplex virus-1 thymidine kinase (HSV-TK) in combination with ganciclovir (GCV) has emerged as a potential new method for treating cancer. We hypothesize that the efficacy of HSV-TK/GCV therapy is at least partially dependent on p53 status in hepatocellular carcinoma (HCC) patients. Using recombinant adenoviral vectors (rAdV), TK, p53, and ASPP2 were overexpressed individually and in combination in Hep3B (p53 null) and HepG2 (p53 wild-type) cell lines and in primary HCC tumor cells. p53 overexpression induced death in Hep3B cells, but not HepG2 cells. ASPP2 overexpression increased rAdV-TK/GCV-induced HepG2 cell death by interacting with endogenous p53. Similarly, ASPP2 reduced survival in rAdV-TK/GCV-treated primary HCC cells expressing p53 wild-type but not a p53 R249S mutant. Mutated p53 was unable to bind to ASPP2, suggesting that the increase in rAdV-TK/GCV-induced cell death resulting from ASPP2 overexpression was dependent on its interaction with p53. Additionally, γ-H2AX foci, ATM phosphorylation, Bax, and p21 expression increased in rAdV-TK/GCV-treated HepG2 cells as compared to Hep3B cells. This suggests that the combined use of HSV-TK, GCV, rAdV-p53 and rAdV-ASPP2 may improve therapeutic efficacy in HCC patients lacking functional p53.
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Affiliation(s)
- Xiuhong Liu
- Beijing You'an Hospital Affiliated with Capital Medical University, Beijing 100069, China.,Beijing Institute of Hepatology, Capital Medical University, Beijing 100069, China
| | - Shuang Wang
- Beijing You'an Hospital Affiliated with Capital Medical University, Beijing 100069, China.,Beijing Institute of Hepatology, Capital Medical University, Beijing 100069, China
| | - Xianghua Guo
- Beijing Institute of Hepatology, Capital Medical University, Beijing 100069, China
| | - Feili Wei
- Beijing Institute of Hepatology, Capital Medical University, Beijing 100069, China
| | - Jiming Yin
- Beijing Institute of Hepatology, Capital Medical University, Beijing 100069, China
| | - Yunjin Zang
- Beijing You'an Hospital Affiliated with Capital Medical University, Beijing 100069, China
| | - Ning Li
- Beijing You'an Hospital Affiliated with Capital Medical University, Beijing 100069, China
| | - Dexi Chen
- Beijing You'an Hospital Affiliated with Capital Medical University, Beijing 100069, China.,Beijing Institute of Hepatology, Capital Medical University, Beijing 100069, China
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Van Hook K, Wang Z, Chen D, Nold C, Zhu Z, Anur P, Lee HJ, Yu Z, Sheppard B, Dai MS, Sears R, Spellman P, Lopez CD. ΔN- ASPP2, a novel isoform of the ASPP2 tumor suppressor, promotes cellular survival. Biochem Biophys Res Commun 2016; 482:1271-1277. [PMID: 27939881 DOI: 10.1016/j.bbrc.2016.12.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Accepted: 12/05/2016] [Indexed: 12/15/2022]
Abstract
ASPP2 is a tumor suppressor that works, at least in part, through enhancing p53-dependent apoptosis. We now describe a new ASPP2 isoform, ΔN-ASPP2, generated from an internal transcription start site that encodes an N-terminally truncated protein missing a predicted 254 amino acids. ΔN-ASPP2 suppresses p53 target gene transactivation, promoter occupancy, and endogenous p53 target gene expression in response to DNA damage. Moreover, ΔN-ASPP2 promotes progression through the cell cycle, as well as resistance to genotoxic stress-induced growth inhibition and apoptosis. Additionally, we found that ΔN-ASPP2 expression is increased in human breast tumors as compared to adjacent normal breast tissue; in contrast, ASPP2 is suppressed in the majority of these breast tumors. Together, our results provide insight into how this new ASPP2 isoform may play a role in regulating the ASPP2-p53 axis.
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Affiliation(s)
- Kathryn Van Hook
- Department of Medicine, Division of Hematology and Medical Oncology and the Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97239, USA
| | - Zhiping Wang
- Department of Medicine, Division of Hematology and Medical Oncology and the Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97239, USA
| | - Dexi Chen
- Department of Medicine, Division of Hematology and Medical Oncology and the Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97239, USA; Beijing Institute of Hepatology, Beijing You'an Hospital, Capital Medical University, Beijing, 100069, China
| | - Casey Nold
- Department of Medicine, Division of Hematology and Medical Oncology and the Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97239, USA
| | - Zhiyi Zhu
- Department of Medicine, Division of Hematology and Medical Oncology and the Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97239, USA
| | - Pavana Anur
- Department of Molecular and Medical Genetics and the Knight Cancer Institute, Oregon Health & Science University, Portland, OR 97239, USA
| | - Hun-Joo Lee
- Department of Medicine, Division of Hematology and Medical Oncology and the Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97239, USA
| | - Zhiyong Yu
- Shandong Tumor Hospital and Institute, Jinan, 250117, China
| | - Brett Sheppard
- Department of Surgery and the Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97239, USA
| | - Mu-Shui Dai
- Department of Molecular and Medical Genetics and the Knight Cancer Institute, Oregon Health & Science University, Portland, OR 97239, USA
| | - Rosalie Sears
- Department of Molecular and Medical Genetics and the Knight Cancer Institute, Oregon Health & Science University, Portland, OR 97239, USA
| | - Paul Spellman
- Department of Molecular and Medical Genetics and the Knight Cancer Institute, Oregon Health & Science University, Portland, OR 97239, USA
| | - Charles D Lopez
- Department of Medicine, Division of Hematology and Medical Oncology and the Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97239, USA.
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Xu L, Tong X, Zhang S, Yin F, Li X, Wei H, Li C, Guo Y, Zhao J. ASPP2 suppresses stem cell-like characteristics and chemoresistance by inhibiting the Src/FAK/Snail axis in hepatocellular carcinoma. Tumour Biol 2016; 37:13669-13677. [PMID: 27473084 DOI: 10.1007/s13277-016-5246-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Accepted: 07/15/2016] [Indexed: 10/21/2022] Open
Abstract
Hepatocellular carcinoma (HCC) is the third leading cause of death in cancer patients worldwide. Understanding the molecular pathogenesis of HCC recurrence and chemoresistance is key to improving patients' prognosis. In this study, we report that downregulation of ASPP2, a member of the ankyrin-repeat-containing, SH3-domain-containing, and proline-rich-region-containing protein (ASPP) family, bestowed HCC cells with stem-like properties and resistance to chemotherapy, including the expansion of side population fractions, formation of hepatospheroids, expression of stem cell-associated genes, loss of chemosensitivity, and increased tumorigenicity in immunodeficient mice. An expression profiling assay revealed that ASPP2 specifically repressed focal adhesion kinase (FAK)/Src/extracellular signal regulated kinase (ERK) signaling. ASPP2 does this by physically interacting with C-terminal Src kinase (CSK) and stimulating its kinase activity, which eventually leads to activator protein 1 (AP1)-mediated downregulation of Snail expression. In addition, pharmacologic inhibition of Src attenuated the effects of ASPP2 deficiency. Our findings present functional and mechanistic insight into the critical role of ASPP2 in the inhibition of HCC stemness and drug resistance and may provide a new strategy for therapeutic combinations to treat HCC.
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Affiliation(s)
- Lu Xu
- School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, China
| | - Xin Tong
- PLA General Hospital Cancer Center Key Lab, PLA Postgraduate School of Medicine, 28 Fuxing Road, Beijing, China.,Beijing Key Laboratory of Cell Engineering and Antibody, Beijing, China
| | - Sujie Zhang
- PLA General Hospital Cancer Center Key Lab, PLA Postgraduate School of Medicine, 28 Fuxing Road, Beijing, China.,Beijing Key Laboratory of Cell Engineering and Antibody, Beijing, China
| | - Fan Yin
- PLA General Hospital Cancer Center Key Lab, PLA Postgraduate School of Medicine, 28 Fuxing Road, Beijing, China.,Beijing Key Laboratory of Cell Engineering and Antibody, Beijing, China
| | - Xiaoyan Li
- PLA General Hospital Cancer Center Key Lab, PLA Postgraduate School of Medicine, 28 Fuxing Road, Beijing, China.,Beijing Key Laboratory of Cell Engineering and Antibody, Beijing, China
| | - Huafeng Wei
- PLA General Hospital Cancer Center Key Lab, PLA Postgraduate School of Medicine, 28 Fuxing Road, Beijing, China.,Beijing Key Laboratory of Cell Engineering and Antibody, Beijing, China
| | - Cheng Li
- PLA General Hospital Cancer Center Key Lab, PLA Postgraduate School of Medicine, 28 Fuxing Road, Beijing, China.,Beijing Key Laboratory of Cell Engineering and Antibody, Beijing, China
| | - Yajun Guo
- State Key Laboratory of Antibody Medicine and Targeting Therapy, Shanghai, China
| | - Jian Zhao
- PLA General Hospital Cancer Center Key Lab, PLA Postgraduate School of Medicine, 28 Fuxing Road, Beijing, China. .,Beijing Key Laboratory of Cell Engineering and Antibody, Beijing, China. .,International Joint Cancer Institute, The Second Military Medical University, 800 Xiang Yin Road, New Building 9th Floor, Shanghai, China.
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Liu K, Jiang T, Ouyang Y, Shi Y, Zang Y, Li N, Lu S, Chen D. Nuclear EGFR impairs ASPP2-p53 complex-induced apoptosis by inducing SOS1 expression in hepatocellular carcinoma. Oncotarget 2016; 6:16507-16. [PMID: 25980493 PMCID: PMC4599285 DOI: 10.18632/oncotarget.3757] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 04/15/2015] [Indexed: 01/26/2023] Open
Abstract
ASPP2 can bind to p53 and enhance the apoptotic capabilities of p53 by guiding it to the promoters of pro-apoptotic genes. Here, ASPP2 overexpression for 24 hours transiently induced apoptosis in hepatoma cells by enhancing the transactivation of p53 on pro-apoptotic gene promoters. However, long-term ASPP2 overexpression (more than 48 hours) failed to induce apoptosis because p53 was released from the pro-apoptotic gene promoters. In non-apoptotic cells, nuclear EGFR induced SOS1 expression by directly binding to the SOS1 promoter. SOS1 activated the HRAS/PI3K/AKT pathway and resulted in nuclear translocation of p-AKT and Bcl-2. The interaction between p-AKT and ASPP2 facilitates Bcl-2 binding to p53, which releases p53 from the pro-apoptotic gene promoters. The in vivo assay demonstrated that EGFR/SOS1-promoted growth of nuclear p-AKT+, Bcl-2+ cells results in the resistance of hepatoma cells to ASPP2-p53 complex-induced apoptosis and that blocking nuclear translocation of EGFR dramatically improves and enhances the pro-apoptotic function of ASPP2. Finally, the activation of the HRAS/PI3K/AKT pathway by EGFR-induced SOS1 also inhibits cisplatin-induced apoptosis, suggesting a common apoptosis-evasion mechanism in hepatoma cells. Because evasion of apoptosis contributes to treatment resistance in hepatoma, our results also support further investigation of combined therapeutic blockade of EGFR and SOS1.
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Affiliation(s)
- Kai Liu
- Beijing You'an Hospital, Capital Medical University, Beijing, 100069, China.,Beijing Institute of Hepatology, Beijing, 100069, China
| | - Tao Jiang
- Beijing You'an Hospital, Capital Medical University, Beijing, 100069, China
| | - Yabo Ouyang
- Beijing You'an Hospital, Capital Medical University, Beijing, 100069, China.,Beijing Institute of Hepatology, Beijing, 100069, China
| | - Ying Shi
- Beijing You'an Hospital, Capital Medical University, Beijing, 100069, China.,Beijing Institute of Hepatology, Beijing, 100069, China
| | - Yunjin Zang
- Beijing You'an Hospital, Capital Medical University, Beijing, 100069, China
| | - Ning Li
- Beijing You'an Hospital, Capital Medical University, Beijing, 100069, China
| | - Shichun Lu
- Beijing You'an Hospital, Capital Medical University, Beijing, 100069, China
| | - Dexi Chen
- Beijing You'an Hospital, Capital Medical University, Beijing, 100069, China.,Beijing Institute of Hepatology, Beijing, 100069, China
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Shi Y, Han Y, Xie F, Wang A, Feng X, Li N, Guo H, Chen D. ASPP2 enhances oxaliplatin (L-OHP)-induced colorectal cancer cell apoptosis in a p53-independent manner by inhibiting cell autophagy. J Cell Mol Med 2014; 19:535-43. [PMID: 25534115 PMCID: PMC4369811 DOI: 10.1111/jcmm.12435] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Accepted: 08/19/2014] [Indexed: 11/27/2022] Open
Abstract
Inactivation of p53-mediated cell death pathways is a central component of cancer progression. ASPP2 (apoptosis stimulated protein of p53-2) is a p53 binding protein that specially stimulates pro-apoptosis function of p53. Down-regulation of ASPP2 is observed in many human cancers and is associated with poor prognosis and metastasis. In this study, ASPP2 was found to enhance L-OHP-induced apoptosis in HCT116 p53−/− cells in a p53-independent manner. Such apoptosis-promoting effect of ASPP2 was achieved by inhibiting autophagy. Further experiments with ASPP2 RNA interference and autophagy inhibitor (3-methyladenine, 3-MA) confirmed that ASPP2 enhanced HCT116 p53−/− cell apoptosis via inhibiting the autophagy. The association of cell death and autophagy was also found in ASPP2+/− mice, where colon tissue with reduced ASPP2 expression displayed more autophagy and less cell death. Finally, colorectal tumours and their adjacent normal tissues from 20 colorectal cancer patients were used to examine ASPP2 expression, p53 expression and p53 mutation, to understand their relationships with the patients' outcome. Three site mutations were found in p53 transcripts from 16 of 20 patients. ASPP2 mRNA expressions were higher, and autophagy level was lower in the adjacent normal tissues, compared with the tumour tissues, which was independent of both p53 mutation and expression level. Taken together, ASPP2 increased tumour sensitivity to chemotherapy via inhibiting autophagy in a p53-independent manner, which was associated with the tumour formation, suggesting that both p53 inactivation and ASPP2 expression level were involved in the sensitivity of colorectal cancer to chemotherapy.
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Affiliation(s)
- Ying Shi
- Beijing Youan Hospital, Capital University of Medical Sciences, Beijing, China; Beijing Institute of Hepatology, Beijing, China
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Xie F, Jia L, Lin M, Shi Y, Yin J, Liu Y, Chen D, Meng Q. ASPP2 attenuates triglycerides to protect against hepatocyte injury by reducing autophagy in a cell and mouse model of non-alcoholic fatty liver disease. J Cell Mol Med 2014; 19:155-64. [PMID: 25256142 PMCID: PMC4288359 DOI: 10.1111/jcmm.12364] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Accepted: 06/10/2014] [Indexed: 01/01/2023] Open
Abstract
ASPP2 is a pro-apoptotic member of the p53 binding protein family. ASPP2 has been shown to inhibit autophagy, which maintains energy balance in nutritional deprivation. We attempted to identify the role of ASPP2 in the pathogenesis of non-alcoholic fatty liver disease (NAFLD). In a NAFLD cell model, control treated and untreated HepG2 cells were pre-incubated with GFP-adenovirus (GFP-ad) for 12 hrs and then treated with oleic acid (OA) for 24 hrs. In the experimental groups, the HepG2 cells were pre-treated with ASPP2-adenovirus (ASPP2-ad) or ASPP2-siRNA for 12 hrs and then treated with OA for 24 hrs. BALB/c mice fed a methionine- and choline-deficient (MCD) diet were used to generate a mouse model of NAFLD. The mice with fatty livers in the control group were pre-treated with injections of GFP-ad for 10 days. In the experimental group, the mice that had been pre-treated with ASPP2-ad were fed an MCD diet for 10 days. ASPP2-ad or GFP-ad was administered once every 5 days. Liver tissue from fatty liver patients and healthy controls were used to analyse the role of ASPP2. Autophagy, apoptosis markers and lipid metabolism mediators, were assessed with confocal fluorescence microscopy, immunohistochemistry, western blot and biochemical assays. ASPP2 overexpression decreased the triglyceride content and inhibited autophagy and apoptosis in the HepG2 cells. ASPP2-ad administration suppressed the MCD diet-induced autophagy, steatosis and apoptosis and decreased the previously elevated alanine aminotransferase levels. In conclusion, ASPP2 may participate in the lipid metabolism of non-alcoholic steatohepatitis and attenuate liver failure.
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Affiliation(s)
- Fang Xie
- Beijing You An Hospital, Affiliated Hospital of Capital Medical University, Beijing, China; Beijing Institute of Hepatology, Beijing, China
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36
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Meng WD, Chu RX, Wang BZ, Wang LP, Ma LL, Wang LX. Helicobacter pylori infection and expressions of apoptosis-related proteins p53, ASPP2 and iASPP in gastric cancer and precancerous lesions. ACTA ACUST UNITED AC 2013; 61:199-202. [PMID: 23528480 DOI: 10.1016/j.patbio.2013.02.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Accepted: 02/15/2013] [Indexed: 12/30/2022]
Abstract
AIMS There has been limited information about the relations between Helicobacter pylori infection and expressions of apoptosis-related proteins p53, ASPP and iASPP in gastric cancer and precancerous lesions. METHODS H. pylori in gastric mucosa were identified by W-S staining and rapid urease test. Expression of apoptosis-related proteins P53, ASPP2 and iASPP in the gastric tissues were determined by immunohistochemistry. RESULTS The concentrations of H. pylori and expressions of p53 and iASPP in gastric carcinoma group and precancerous lesion group were higher than in benign gastric diseases group (P<0.05). The expressions of ASPP2 in gastric carcinoma and precancerous lesion group were lower than in benign gastric diseases group (P<0.05). The expressions of p53 and iASPP in H. pylori positive group were higher than in H. pylori negative group (P<0.05), whereas ASPP2 in H. pylori positive group were lower than in H. pylori negative group (P<0.05). CONCLUSION There was a higher rate H. pylori infection, an increased expression of apoptosis inhibitor iASPP, and decreased expression of apoptosis stimulator ASPP2 in gastric cancer or precancerous tissues. These results suggest that H. pylori may cause gastric cancer by up-regulating iASPP and down-regulating ASPP2.
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