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Wang YR, Xie N, Zhang YJ, Wang L, Sun Z, Zeng T. High-fat diet promotes multiple binges-induced liver injury via promoting hepatic macrophage proinflammatory polarization. Toxicol Res (Camb) 2023; 12:480-492. [PMID: 37397912 PMCID: PMC10311135 DOI: 10.1093/toxres/tfad033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 04/21/2023] [Accepted: 04/27/2023] [Indexed: 07/04/2023] Open
Abstract
High-fat diet (HFD) and ethanol could synergistically induce liver damage, but the underlying mechanisms remain to be elucidated. M1-polarized macrophages have been demonstrated to be key players in ethanol-induced liver damage. The current study was designed to investigate whether hepatic steatosis could promote ethanol-induced liver injury by promoting liver macrophage M1 polarization. In the in vivo study, 12 weeks of HFD feeding induced a moderate increase in the F4/80 expression and protein levels of p-IKKα/β, p-IκBα, and p-p65, which was suppressed by single binge. In contrast, 8 weeks of HFD and multiple binges (two binges per week during the last 4 weeks) synergistically increased the F4/80 expression, mRNA levels of M1 polarization biomarkers including Ccl2, Tnfa, and Il1b, and protein levels of p65, p-p65, COX2, and Caspase 1. In the in vitro study, a nontoxic free fatty acids (FFAs) mixture (oleic acid/palmitic acid = 2: 1) induced a moderate increase of protein levels of p-p65 and NLRP3 in murine AML12 hepatocytes, which was inhibited by ethanol co-exposure. Ethanol alone induced proinflammatory polarization of murine J774A.1 macrophages evidenced by the enhanced secretion of TNF-α, increased mRNA levels of Ccl2, Tnfa, and Il1b, and upregulated protein levels of p65, p-p65, NLRP3, and Caspase 1, which was augmented by FFAs exposure. Collectively, these results suggest that HFD and multiple binges could synergistically induce liver damage by promoting the proinflammatory activation of macrophages in mice livers.
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Affiliation(s)
- Yi-Ran Wang
- Institute of Toxicology, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Na Xie
- Department of Gastroenterology, Jining Third People's Hospital, Jining, Shandong 272100, China
| | - Yan-Jing Zhang
- Institute of Toxicology, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Lin Wang
- Institute of Toxicology, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Zhan Sun
- Institute of Physical and Chemical Analysis, Jinan Municipal Center for Disease Control and Prevention, Jinan, Shandong 250021, China
| | - Tao Zeng
- Institute of Toxicology, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, China
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2
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Yazgili AS, Ebstein F, Meiners S. The Proteasome Activator PA200/PSME4: An Emerging New Player in Health and Disease. Biomolecules 2022; 12:biom12081150. [PMID: 36009043 PMCID: PMC9406137 DOI: 10.3390/biom12081150] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Revised: 08/17/2022] [Accepted: 08/18/2022] [Indexed: 11/24/2022] Open
Abstract
Proteasomes comprise a family of proteasomal complexes essential for maintaining protein homeostasis. Accordingly, proteasomes represent promising therapeutic targets in multiple human diseases. Several proteasome inhibitors are approved for treating hematological cancers. However, their side effects impede their efficacy and broader therapeutic applications. Therefore, understanding the biology of the different proteasome complexes present in the cell is crucial for developing tailor-made inhibitors against specific proteasome complexes. Here, we will discuss the structure, biology, and function of the alternative Proteasome Activator 200 (PA200), also known as PSME4, and summarize the current evidence for its dysregulation in different human diseases. We hereby aim to stimulate research on this enigmatic proteasome regulator that has the potential to serve as a therapeutic target in cancer.
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Affiliation(s)
- Ayse Seda Yazgili
- Comprehensive Pneumology Center (CPC), Helmholtz Center Munich, Max-Lebsche Platz 31, 81377 Munich, Germany
| | - Frédéric Ebstein
- Institut für Medizinische Biochemie und Molekularbiologie (IMBM), Universitätsmedizin Greifswald, Ferdinand-Sauerbruch-Straße, Klinikum DZ/7, 17475 Greifswald, Germany
| | - Silke Meiners
- Research Center Borstel/Leibniz Lung Center, Parkallee 1-40, 23845 Borstel, Germany
- Airway Research Center North (ARCN), German Center for Lung Research (DZL), 23845 Sülfeld, Germany
- Institute of Experimental Medicine, Christian-Albrechts University Kiel, 24118 Kiel, Germany
- Correspondence: ; Tel.: +49-4537-188-58
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Hyun J, Han J, Lee C, Yoon M, Jung Y. Pathophysiological Aspects of Alcohol Metabolism in the Liver. Int J Mol Sci 2021; 22:ijms22115717. [PMID: 34071962 PMCID: PMC8197869 DOI: 10.3390/ijms22115717] [Citation(s) in RCA: 83] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 05/22/2021] [Accepted: 05/24/2021] [Indexed: 12/12/2022] Open
Abstract
Alcoholic liver disease (ALD) is a globally prevalent chronic liver disease caused by chronic or binge consumption of alcohol. The liver is the major organ that metabolizes alcohol; therefore, it is particularly sensitive to alcohol intake. Metabolites and byproducts generated during alcohol metabolism cause liver damage, leading to ALD via several mechanisms, such as impairing lipid metabolism, intensifying inflammatory reactions, and inducing fibrosis. Despite the severity of ALD, the development of novel treatments has been hampered by the lack of animal models that fully mimic human ALD. To overcome the current limitations of ALD studies and therapy development, it is necessary to understand the molecular mechanisms underlying alcohol-induced liver injury. Hence, to provide insights into the progression of ALD, this review examines previous studies conducted on alcohol metabolism in the liver. There is a particular focus on the occurrence of ALD caused by hepatotoxicity originating from alcohol metabolism.
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Affiliation(s)
- Jeongeun Hyun
- Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan 31116, Korea;
- Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan 31116, Korea
- Department of Regenerative Dental Medicine, College of Dentistry, Dankook University, Cheonan 31116, Korea
| | - Jinsol Han
- Department of Integrated Biological Science, Pusan National University, Pusan 46241, Korea; (J.H.); (C.L.)
| | - Chanbin Lee
- Department of Integrated Biological Science, Pusan National University, Pusan 46241, Korea; (J.H.); (C.L.)
| | - Myunghee Yoon
- Department of Surgery, Division of Hepatobiliary and Pancreas Surgery, Biomedical Research Institute, Pusan National University, Pusan 46241, Korea;
| | - Youngmi Jung
- Department of Integrated Biological Science, Pusan National University, Pusan 46241, Korea; (J.H.); (C.L.)
- Department of Biological Sciences, Pusan National University, Pusan 46241, Korea
- Correspondence: ; Tel.: +82-51-510-2262
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Wang CY, Li CY, Hsu HP, Cho CY, Yen MC, Weng TY, Chen WC, Hung YH, Lee KT, Hung JH, Chen YL, Lai MD. PSMB5 plays a dual role in cancer development and immunosuppression. Am J Cancer Res 2017; 7:2103-2120. [PMID: 29218236 PMCID: PMC5714741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Accepted: 09/25/2017] [Indexed: 06/07/2023] Open
Abstract
Tumor progression and metastasis are dependent on the intrinsic properties of tumor cells and the influence of microenvironment including the immune system. It would be important to identify target drug that can inhibit cancer cell and activate immune cells. Proteasome β subunits (PSMB) family, one component of the ubiquitin-proteasome system, has been demonstrated to play an important role in tumor cells and immune cells. Therefore, we used a bioinformatics approach to examine the potential role of PSMB family. Analysis of breast TCGA and METABRIC database revealed that high expression of PSMB5 was observed in breast cancer tissue and that high expression of PSMB5 predicted worse survival. In addition, high expression of PSMB5 was observed in M2 macrophages. Based on our bioinformatics analysis, we hypothesized that PSMB5 contained immunosuppressive and oncogenic characteristics. To study the effects of PSMB5 on the cancer cell and macrophage in vitro, we silenced PSMB5 expression with shRNA in THP-1 monocytes and MDA-MB-231 cells respectively. Knockdown of PSMB5 promoted human THP-1 monocyte differentiation into M1 macrophage. On the other hand, knockdown PSMB5 gene expression inhibited MDA-MB-231 cell growth and migration by colony formation assay and boyden chamber. Collectively, our data demonstrated that delivery of PSMB5 shRNA suppressed cell growth and activated defensive M1 macrophages in vitro. Furthermore, lentiviral delivery of PSMB5 shRNA significantly decreased tumor growth in a subcutaneous mouse model. In conclusion, our bioinformatics study and functional experiments revealed that PSMB5 served as novel cancer therapeutic targets. These results also demonstrated a novel translational approach to improve cancer immunotherapy.
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Affiliation(s)
- Chih-Yang Wang
- Department of Biochemistry and Molecular Biology, National Cheng Kung UniversityTainan, Taiwan, R.O.C
- Institute of Basic Medical Sciences, National Cheng Kung UniversityTainan, Taiwan, R.O.C
| | - Chung-Yen Li
- Department of Biochemistry and Molecular Biology, National Cheng Kung UniversityTainan, Taiwan, R.O.C
| | - Hui-Ping Hsu
- Department of Surgery, College of Medicine, National Cheng Kung UniversityTainan, Taiwan, R.O.C
| | - Chien-Yu Cho
- Department of Biochemistry and Molecular Biology, National Cheng Kung UniversityTainan, Taiwan, R.O.C
- Institute of Basic Medical Sciences, National Cheng Kung UniversityTainan, Taiwan, R.O.C
| | - Meng-Chi Yen
- Department of Emergency Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical UniversityKaohsiung, Taiwan, R.O.C
| | - Tzu-Yang Weng
- Department of Biochemistry and Molecular Biology, National Cheng Kung UniversityTainan, Taiwan, R.O.C
- Institute of Basic Medical Sciences, National Cheng Kung UniversityTainan, Taiwan, R.O.C
| | - Wei-Ching Chen
- Department of Biochemistry and Molecular Biology, National Cheng Kung UniversityTainan, Taiwan, R.O.C
- Institute of Basic Medical Sciences, National Cheng Kung UniversityTainan, Taiwan, R.O.C
| | - Yu-Hsuan Hung
- Department of Biochemistry and Molecular Biology, National Cheng Kung UniversityTainan, Taiwan, R.O.C
- Institute of Basic Medical Sciences, National Cheng Kung UniversityTainan, Taiwan, R.O.C
| | - Kuo-Ting Lee
- Department of Surgery, College of Medicine, National Cheng Kung UniversityTainan, Taiwan, R.O.C
| | - Jui-Hsiang Hung
- Department of Biotechnology, Chia Nan University of Pharmacy and ScienceTainan, Taiwan, R.O.C
| | - Yi-Ling Chen
- Department of Senior Citizen Service Management, Chia Nan University of Pharmacy and ScienceTainan, Taiwan, R.O.C
| | - Ming-Derg Lai
- Department of Biochemistry and Molecular Biology, National Cheng Kung UniversityTainan, Taiwan, R.O.C
- Institute of Basic Medical Sciences, National Cheng Kung UniversityTainan, Taiwan, R.O.C
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5
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Telles TM, de Oliveira BM, Lomba LA, Leite-Avalca MG, Correia D, Zampronio AR. Effects of Binge-Like Ethanol Exposure During Adolescence on the Febrile Response in Rats. Alcohol Clin Exp Res 2017; 41:507-515. [DOI: 10.1111/acer.13333] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 12/26/2016] [Indexed: 01/26/2023]
Affiliation(s)
| | | | - Luis A. Lomba
- Department of Pharmacology; Federal University of Paraná; Curitiba PR Brazil
| | | | - Diego Correia
- Department of General Biology; Federal University of Minas Gerais; Belo Horizonte MG Brazil
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Park JS, Ji IJ, Kim DH, An HJ, Yoon SY. The Alzheimer's Disease-Associated R47H Variant of TREM2 Has an Altered Glycosylation Pattern and Protein Stability. Front Neurosci 2017; 10:618. [PMID: 28149270 PMCID: PMC5241589 DOI: 10.3389/fnins.2016.00618] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 12/26/2016] [Indexed: 11/13/2022] Open
Abstract
The R47H coding variant of the triggering receptor expressed on myeloid cells-2 (TREM2) increases the risk of Alzheimer's disease (AD) similar to apolipoprotein E4. TREM2 R47H has recently been shown to have impaired binding to damage-associated lipid or apolipoprotein ligands. However, it is not known how this R47H variant affects the biochemical characteristics of TREM2 and alters the pathogenesis of AD. We previously reported that TREM2-R47H has a slightly different glycosylation pattern from wild-type. A more detailed characterization in our present study confirms that TREM2 R47H has an altered glycosylation pattern and reduced stability. TREM2 R47H shows different glycosylation profiles from analysis using monensin or kifunensine treatment which were confirmed by mass spectrometry. The solubility of TREM2 R47H and its cleaved products such as intracellular domain (ICD) is also decreased, increasing its proteasomal and lysosomal degradation. The different biochemical characteristics of TREM2 R47H, including glycosylation, solubility and processing, may offer insights into a future therapeutic strategy for AD.
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Affiliation(s)
- Ji-Seon Park
- Alzheimer's Disease Experts Lab, Asan Medical Center, University of Ulsan College of MedicineSeoul, South Korea; Department of Brain Science, University of Ulsan College of MedicineSeoul, South Korea; Bio-Medical Institute of Technology, University of Ulsan College of MedicineSeoul, South Korea; Cell Dysfunction Research Center, University of Ulsan College of MedicineSeoul, South Korea
| | - In Jung Ji
- Asia Glycomics Reference SiteDaejeon, South Korea; Graduate School of Analytical Science and Technology, Chungnam National UniversityDaejeon, South Korea
| | - Dong-Hou Kim
- Alzheimer's Disease Experts Lab, Asan Medical Center, University of Ulsan College of MedicineSeoul, South Korea; Department of Brain Science, University of Ulsan College of MedicineSeoul, South Korea; Bio-Medical Institute of Technology, University of Ulsan College of MedicineSeoul, South Korea; Cell Dysfunction Research Center, University of Ulsan College of MedicineSeoul, South Korea
| | - Hyun Joo An
- Asia Glycomics Reference SiteDaejeon, South Korea; Graduate School of Analytical Science and Technology, Chungnam National UniversityDaejeon, South Korea
| | - Seung-Yong Yoon
- Alzheimer's Disease Experts Lab, Asan Medical Center, University of Ulsan College of MedicineSeoul, South Korea; Department of Brain Science, University of Ulsan College of MedicineSeoul, South Korea; Bio-Medical Institute of Technology, University of Ulsan College of MedicineSeoul, South Korea; Cell Dysfunction Research Center, University of Ulsan College of MedicineSeoul, South Korea
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7
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The immunoproteasomes are key to regulate myokines and MHC class I expression in idiopathic inflammatory myopathies. J Autoimmun 2016; 75:118-129. [PMID: 27522114 DOI: 10.1016/j.jaut.2016.08.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 07/26/2016] [Accepted: 08/03/2016] [Indexed: 12/18/2022]
Abstract
Idiopathic inflammatory myopathies (IIMs) are diseases with muscle weakness, morphologically characterized by inflammatory infiltration and increased expression of MHC class I molecule on myofibers. Immunoproteasome, as a proteolytic complex that shapes the repertoire of antigenic peptides, has been previously demonstrated to be over-expressed in IIMs at mRNA level. In this study, we investigated the expression and the function of the immunoproteasome in IIMs in more detail. As shown by immunofluorescence staining, expression of relevant players of the immunoproteasome was detectable in the inflamed skeletal muscle tissue from IIM patients. In fact, two subunits of the immunoproteasome, β1i or β5i were upregulated in sporadic inclusion body myositis, immune-mediated necrotizing myopathies and dermatomyositis muscle biopsies and co-localized with the MHC class I expressing myofibers. Double immunofluorescence revealed that both myofibers and muscle infiltrating cells, including CD8+ T-cells and CD68 + macrophages in IIMs expressed β1i or β5i. In addition, we have also investigated the role of the immunoproteasome in myoblasts during in vitro inflammatory conditions. Using human primary myoblasts cultures we found that pro-inflammatory cytokines, TNF-α or IFN-γ upregulate β1i or β5i. Selective inhibition or depletion of β5i amplified the TNF-α or IFN-γ mediated expression of cytokines/chemokines (myokines) in myoblasts. Furthermore, we demonstrated that specific inhibitors of β1i or β5i reduced the cell surface expression of MHC class I in myoblasts induced by IFN-γ. Taken together, our data suggest that the immunoproteasome is involved in pathologic MHC class I expression and maintenance of myokine production in IIMs. Thus, induction of the immunoproteasome was identified as a pathomechanism underlying inflammation in IIMs.
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8
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Kammerl IE, Meiners S. Proteasome function shapes innate and adaptive immune responses. Am J Physiol Lung Cell Mol Physiol 2016; 311:L328-36. [PMID: 27343191 DOI: 10.1152/ajplung.00156.2016] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 06/17/2016] [Indexed: 11/22/2022] Open
Abstract
The proteasome system degrades more than 80% of intracellular proteins into small peptides. Accordingly, the proteasome is involved in many essential cellular functions, such as protein quality control, transcription, immune responses, cell signaling, and apoptosis. Moreover, degradation products are loaded onto major histocompatibility class I molecules to communicate the intracellular protein composition to the immune system. The standard 20S proteasome core complex contains three distinct catalytic active sites that are exchanged upon stimulation with inflammatory cytokines to form the so-called immunoproteasome. Immunoproteasomes are constitutively expressed in immune cells and have different proteolytic activities compared with standard proteasomes. They are rapidly induced in parenchymal cells upon intracellular pathogen infection and are crucial for priming effective CD8(+) T-cell-mediated immune responses against infected cells. Beyond shaping these adaptive immune reactions, immunoproteasomes also regulate the function of immune cells by degradation of inflammatory and immune mediators. Accordingly, they emerge as novel regulators of innate immune responses. The recently unraveled impairment of immunoproteasome function by environmental challenges and by genetic variations of immunoproteasome genes might represent a currently underestimated risk factor for the development and progression of lung diseases. In particular, immunoproteasome dysfunction will dampen resolution of infections, thereby promoting exacerbations, may foster autoimmunity in chronic lung diseases, and possibly contributes to immune evasion of tumor cells. Novel pharmacological tools, such as site-specific inhibitors of the immunoproteasome, as well as activity-based probes, however, hold promises as innovative therapeutic drugs for respiratory diseases and biomarker profiling, respectively.
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Affiliation(s)
- Ilona E Kammerl
- Comprehensive Pneumology Center, University Hospital, Ludwig-Maximilians University and Helmholtz Zentrum München, Member of the German Center for Lung Research (DZL), Munich, Germany
| | - Silke Meiners
- Comprehensive Pneumology Center, University Hospital, Ludwig-Maximilians University and Helmholtz Zentrum München, Member of the German Center for Lung Research (DZL), Munich, Germany
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9
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Emerging role of immunoproteasomes in pathophysiology. Immunol Cell Biol 2016; 94:812-820. [PMID: 27192937 DOI: 10.1038/icb.2016.50] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 05/15/2016] [Accepted: 05/16/2016] [Indexed: 11/08/2022]
Abstract
The immunoproteasome is a proteasome variant that is found only in jawed vertebrates. It is responsible for degrading intracellular proteins to generate a major source of peptides with substantial major histocompatibility complex I binding affinity. The immunoproteasome also has roles in T-cell survival, differentiation and proliferation in various pathological conditions. In humans, any alteration in the expression, assembly or function of the immunoproteasome can lead to cancer, autoimmune disorders or inflammatory diseases. Although the roles of the immunoproteasome in cancer and neurodegenerative disorders have been extensively studied, its significance in other disease conditions has only recently become known. Therefore, there is renewed interest in the development of drugs, vaccines and biomarkers that target the immunoproteasome. The current review highlights the involvement of this complex in disease pathology in addition to the advances made in immunoproteasome research.
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10
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Burks J, Reed RE, Desai SD. Free ISG15 triggers an antitumor immune response against breast cancer: a new perspective. Oncotarget 2016; 6:7221-31. [PMID: 25749047 PMCID: PMC4466680 DOI: 10.18632/oncotarget.3372] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Accepted: 01/13/2015] [Indexed: 12/20/2022] Open
Abstract
Interferon-Stimulated Gene 15 (ISG15), an antagonist of the canonical ubiquitin pathway, is frequently overexpressed in various cancers. In cancer cells, ISG15 is detected as free (intracellular) and conjugated to cellular proteins (ISGylation). Free ISG15 is also secreted into the extracellular milieu. ISGylation has protumor functions and extracellular free ISG15 has immunomodulatory properties in vitro. Therefore, whether ISG15 is a tumor suppressor or tumor promoter in vivo remains controversial. The current study aimed to clarify the role of free ISG15 in tumorigenesis. Breast cancer cells stably expressing control, ISG15, and UbcH8 (ISG15-specific E2 ligase) shRNAs were used to assess the immunoregulatory and antitumor function of free ISG15 in cell culture (in vitro) and in nude mice (in vivo). We show that extracellular free ISG15 suppresses breast tumor growth and increases NK cell infiltration into xenografted breast tumors in nude mice, and intracellular free ISG15 enhances major histocompatibility complex (MHC) class I surface expression in breast cancer cells. We conclude that free ISG15 may have antitumor and immunoregulatory function in vivo. These findings provides the basis for developing strategies to increase systemic levels of free ISG15 to treat cancer patients overexpressing the ISG15 pathway.
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Affiliation(s)
- Julian Burks
- Department of Biochemistry & Molecular Biology, LSU Health Sciences Center-School of Medicine, New Orleans, LA, USA.,Present Address: Georgetown University Medical Center, Lombardi Comprehensive Cancer Center Department of Molecular Oncology, Washington, DC, USA
| | - Ryan E Reed
- Department of Biochemistry & Molecular Biology, LSU Health Sciences Center-School of Medicine, New Orleans, LA, USA
| | - Shyamal D Desai
- Department of Biochemistry & Molecular Biology, LSU Health Sciences Center-School of Medicine, New Orleans, LA, USA
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11
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Nasheri N, Ning Z, Figeys D, Yao S, Goto NK, Pezacki JP. Activity-based profiling of the proteasome pathway during hepatitis C virus infection. Proteomics 2015; 15:3815-25. [PMID: 26314548 DOI: 10.1002/pmic.201500169] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 07/28/2015] [Accepted: 08/24/2015] [Indexed: 12/30/2022]
Abstract
Hepatitis C virus (HCV) infection often leads to chronic hepatitis, liver cirrhosis, and hepatocellular carcinoma. The stability of the HCV proteins is controlled by ubiquitin-dependent and ubiquitin-independent proteasome pathways. Many viruses modulate proteasome function for their propagation. To examine the interrelationship between HCV and the proteasome pathways we employed a quantitative activity-based protein profiling method. Using this approach we were able to quantify the changes in the activity of several proteasome subunits and found that proteasome activity is drastically reduced by HCV replication. The results imply a link between the direct downregulation of the activity of this pathway and chronic HCV infection.
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Affiliation(s)
- Neda Nasheri
- Life Sciences Division, National Research Council of Canada, Ottawa, Canada.,Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Canada
| | - Zhibin Ning
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Canada
| | - Daniel Figeys
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Canada.,Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Canada
| | - Shao Yao
- Department of Chemistry, National University of Singapore, Singapore
| | - Natalie K Goto
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Canada.,Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Canada
| | - John Paul Pezacki
- Life Sciences Division, National Research Council of Canada, Ottawa, Canada.,Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Canada.,Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Canada
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12
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Alvarenga DM, Perez DA, Gomes-Santos AC, Miyoshi A, Azevedo V, Coelho-Dos-Reis JGA, Martins-Filho OA, Faria AMC, Cara DC, Andrade MC. Previous Ingestion of Lactococcus lactis by Ethanol-Treated Mice Preserves Antigen Presentation Hierarchy in the Gut and Oral Tolerance Susceptibility. Alcohol Clin Exp Res 2015; 39:1453-64. [PMID: 26110492 DOI: 10.1111/acer.12770] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Accepted: 05/04/2015] [Indexed: 12/22/2022]
Abstract
BACKGROUND Ethanol (EtOH) consumption is able to disturb the ovalbumin (OVA)-oral tolerance induction by interfering on the function of antigen presenting cells (APC), down-regulating dendritic cells (DCs) and macrophages and up-regulating B-lymphocytes and their function, which results in an overall allergic-type immune status. In this study, the potential of a priori administration of Lactococcus lactis (LL) in avoiding loss of oral tolerance in EtOH-treated mice was investigated. METHODS Female C57BL/6 mice received, by oral route, ad libitum wild-type (WT) LL or heat-shock protein producer (Hsp65) LL for 4 consecutive days. Seven days later, mice were submitted to short-term high-dose EtOH treatment. After 24 hours, stomach, intestine, spleen, mesenteric lymph nodes (mLN) specimens were collected for biomarkers analysis. Following EtOH-treatment protocol, a group of animals underwent single-gavage OVA-tolerance protocol and sera samples collected for antibody analysis. RESULTS The ingestion of WT LL or Hsp65 LL is able to restore oral tolerance to OVA in EtOH-treated mice, by reducing local and systemic allergic outcomes such as gastric mast cells and gut-interleukin-4, as well as serum IgE. WT LL treatment prevents the decrease of mLN regulatory T cells induced by the EtOH treatment. Moreover, LL treatment preserves APC hierarchy and antigen presentation commitment in EtOH-treated mice, with conserved DC and macrophage activity over B lymphocytes in mLN and preserved macrophage activity over DC and B-cell subsets in the spleen. CONCLUSIONS The present findings suggest that a priori ingestion of LL preserves essential mechanisms associated with oral tolerance induction that are disturbed by EtOH ingestion. Maintenance of mucosal homeostasis by preserving APC hierarchy and antigen presentation commitment could be associated with T-regulatory subset activities in the gastrointestinal tract.
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Affiliation(s)
- Débora M Alvarenga
- Universidade Federal de Minas Gerais (UFMG), ICB, UFMG, Belo Horizonte, MG, Brazil
| | - Denise A Perez
- Universidade Federal de Minas Gerais (UFMG), ICB, UFMG, Belo Horizonte, MG, Brazil
| | - Ana C Gomes-Santos
- Universidade Federal de Minas Gerais (UFMG), ICB, UFMG, Belo Horizonte, MG, Brazil
| | - Anderson Miyoshi
- Universidade Federal de Minas Gerais (UFMG), ICB, UFMG, Belo Horizonte, MG, Brazil
| | - Vasco Azevedo
- Universidade Federal de Minas Gerais (UFMG), ICB, UFMG, Belo Horizonte, MG, Brazil
| | | | | | - Ana Maria C Faria
- Universidade Federal de Minas Gerais (UFMG), ICB, UFMG, Belo Horizonte, MG, Brazil
| | - Denise C Cara
- Universidade Federal de Minas Gerais (UFMG), ICB, UFMG, Belo Horizonte, MG, Brazil
| | - Marileia C Andrade
- Universidade Estadual de Montes Claros (UNIMONTES), Montes Claros, MG, Brazil
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Park JS, Ji IJ, An HJ, Kang MJ, Kang SW, Kim DH, Yoon SY. Disease-Associated Mutations of TREM2 Alter the Processing of N-Linked Oligosaccharides in the Golgi Apparatus. Traffic 2015; 16:510-8. [PMID: 25615530 DOI: 10.1111/tra.12264] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Revised: 01/13/2015] [Accepted: 01/14/2015] [Indexed: 01/04/2023]
Abstract
The triggering receptor expressed on myeloid cells 2 (TREM2) is an immune-modulatory receptor involved in phagocytosis and inflammation. Mutations of Q33X, Y38C and T66M cause Nasu-Hakola disease (NHD) which is characterized by early onset of dementia and bone cysts. A recent, genome-wide association study also revealed that single nucleotide polymorphism of TREM2, such as R47H, increased the risk of Alzheimer's disease (AD) similar to ApoE4. However, how these mutations affect the trafficking of TREM2, which may affect the normal functions of TREM2, was not known. In this study, we show that TREM2 with NHD mutations are impaired in the glycosylation with complex oligosaccharides in the Golgi apparatus, in the trafficking to plasma membrane and further processing by γ-secretase. Although R47H mutation in AD affected the glycosylation and normal trafficking of TREM2 less, the detailed pattern of glycosylated TREM2 differs from that of the wild type, thus suggesting that precise regulation of TREM2 glycosylation is impaired when arginine at 47 is mutated to histidine. Our results suggest that the impaired glycosylation and trafficking of TREM2 from endoplasmic reticulum/Golgi to plasma membrane by mutations may inhibit its normal functions in the plasma membrane, which may contribute to the disease.
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Affiliation(s)
- Ji-Seon Park
- Alzheimer's Disease Experts Lab (ADEL), Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea; Department of Brain Science, University of Ulsan College of Medicine, Seoul, Republic of Korea; Bio-Medical Institute of Technology (BMIT), University of Ulsan College of Medicine, Seoul, Republic of Korea; Cell Dysfunction Research Center (CDRC), University of Ulsan College of Medicine, Seoul, Republic of Korea
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Yun JW, Son MJ, Abdelmegeed MA, Banerjee A, Morgan TR, Yoo SH, Song BJ. Binge alcohol promotes hypoxic liver injury through a CYP2E1-HIF-1α-dependent apoptosis pathway in mice and humans. Free Radic Biol Med 2014; 77:183-94. [PMID: 25236742 PMCID: PMC4304203 DOI: 10.1016/j.freeradbiomed.2014.08.030] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Revised: 08/27/2014] [Accepted: 08/28/2014] [Indexed: 12/11/2022]
Abstract
Binge drinking, a common pattern of alcohol ingestion, is known to potentiate liver injury caused by chronic alcohol abuse. This study was aimed at investigating the effects of acute binge alcohol on hypoxia-inducible factor-1α (HIF-1α)-mediated liver injury and the roles of alcohol-metabolizing enzymes in alcohol-induced hypoxia and hepatotoxicity. Mice and human specimens assigned to binge or nonbinge groups were analyzed for blood alcohol concentration (BAC), alcohol-metabolizing enzymes, HIF-1α-related protein nitration, and apoptosis. Binge alcohol promoted acute liver injury in mice with elevated levels of ethanol-inducible cytochrome P450 2E1 (CYP2E1) and hypoxia, both of which were colocalized in the centrilobular areas. We observed positive correlations among elevated BAC, CYP2E1, and HIF-1α in mice and humans exposed to binge alcohol. The CYP2E1 protein levels (r = 0.629, p = 0.001) and activity (r = 0.641, p = 0.001) showed a significantly positive correlation with BAC in human livers. HIF-1α levels were also positively correlated with BAC (r = 0.745, p < 0.001) or CYP2E1 activity (r = 0.792, p < 0.001) in humans. Binge alcohol promoted protein nitration and apoptosis with significant correlations observed between inducible nitric oxide synthase and BAC, CYP2E1, or HIF-1α in human specimens. Binge-alcohol-induced HIF-1α activation and subsequent protein nitration or apoptosis seen in wild type were significantly alleviated in the corresponding Cyp2e1-null mice, whereas pretreatment with an HIF-1α inhibitor, PX-478, prevented HIF-1α elevation with a trend of decreased levels of 3-nitrotyrosine and apoptosis, supporting the roles of CYP2E1 and HIF-1α in binge-alcohol-mediated protein nitration and hepatotoxicity. Thus binge alcohol promotes acute liver injury in mice and humans at least partly through a CYP2E1-HIF-1α-dependent apoptosis pathway.
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Affiliation(s)
- Jun-Won Yun
- Laboratory of Membrane Biochemistry and Biophysics, National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD 20892-9410, USA
| | - Min-Jeong Son
- Institute of Forensic Medicine, Seoul National University College of Medicine, Seoul, South Korea
| | - Mohamed A Abdelmegeed
- Laboratory of Membrane Biochemistry and Biophysics, National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD 20892-9410, USA
| | - Atrayee Banerjee
- Laboratory of Membrane Biochemistry and Biophysics, National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD 20892-9410, USA
| | - Timothy R Morgan
- Gastroenterology Service, Veterans Administration Long Beach Healthcare System, Long Beach, CA 90822, USA; Division of Gastroenterology, University of California at Irvine, Irvine, CA 92697, USA
| | - Seong-Ho Yoo
- Institute of Forensic Medicine, Seoul National University College of Medicine, Seoul, South Korea.
| | - Byoung-Joon Song
- Laboratory of Membrane Biochemistry and Biophysics, National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD 20892-9410, USA.
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Decreased lipid absorption due to reduced pancreatic lipase activity in aging male mice. Biogerontology 2014; 15:463-73. [PMID: 25033985 DOI: 10.1007/s10522-014-9512-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 06/23/2014] [Indexed: 12/23/2022]
Abstract
Malnutrition due to aging is partly caused by decreased absorption of nutrients by the gastrointestinal tract. However, the underlying mechanism is unclear and changes in lipid absorption with aging are poorly understood. In this study, changes in lipid absorption with aging were examined in mice aged 3 and 25 months. After overnight fasting, blood samples were collected from snipped tails and then soybean oil was administered orally. Three hours later, mice were sacrificed by decapitation and the liver, pancreas, small intestine and blood were collected. The increase in serum triacylglycerol after soybean oil administration was significantly lower in the older mice, indicating a decrease in lipid absorption with aging. Measurement of mRNA levels for triacylglycerol absorption-related genes showed that mRNA for pancreatic lipase tended to decrease in 25-month-old mice. There was no significant difference in the protein level of pancreatic lipase, but the enzyme activity showed a significant decrease in the older mice. To examine this mechanism, expression levels of mRNA for protein turnover-related genes in the pancreas were measured. The level of a proteasomal mRNA showed a significant decrease in 25-month-old mice. This suggests that the ability to degrade unfolded protein decreases in the aging pancreas, and that this leads to reduction of pancreatic lipase activity and a decrease in lipid absorption.
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Muralidharan S, Ambade A, Fulham MA, Deshpande J, Catalano D, Mandrekar P. Moderate alcohol induces stress proteins HSF1 and hsp70 and inhibits proinflammatory cytokines resulting in endotoxin tolerance. THE JOURNAL OF IMMUNOLOGY 2014; 193:1975-87. [PMID: 25024384 DOI: 10.4049/jimmunol.1303468] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Binge or moderate alcohol exposure impairs host defense and increases susceptibility to infection because of compromised innate immune responses. However, there is a lack of consensus on the molecular mechanism by which alcohol mediates this immunosuppression. In this study, we show that cellular stress proteins HSF1 and hsp70 play a mechanistic role in alcohol-mediated inhibition of the TLR4/MyD88 pathway. Alcohol exposure induced transcription factor HSF1 mRNA expression and DNA binding activity in primary human monocytes and murine macrophages. Furthermore, HSF1 target gene hsp70 mRNA and protein are upregulated by alcohol in monocytes. In vitro pre-exposure to moderate alcohol reduced subsequent LPS-induced NF-κB promoter activity and downstream TNF-α, IL-6 and IL-1β production in monocytes and macrophages, exhibiting endotoxin tolerance. Mechanistic analysis demonstrates that alcohol-induced HSF1 binds to the TNF-α promoter in macrophages at early time points, exerting transrepression and decreased TNF-α expression. Furthermore, association of hsp70 with NF-κB subunit p50 in alcohol-treated macrophages correlates with reduced NF-κB activation at later time points. Hsp70 overexpression in macrophages was sufficient to block LPS-induced NF-κB promoter activity, suggesting alcohol-mediated immunosuppression by hsp70. The direct crosstalk of hsp70 and HSF1 was further confirmed by the loss of alcohol-mediated endotoxin tolerance in hsp70- and HSF1-silenced macrophages. Our data suggest that alcohol-mediated activation of HSF1 and induction of hsp70 inhibit TLR4-MyD88 signaling and are required for alcohol-induced endotoxin tolerance. Using stress proteins as direct drug targets would be clinically relevant in alcohol abuse treatment and may serve to provide a better understanding of alcohol-mediated immunosuppression.
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Affiliation(s)
- Sujatha Muralidharan
- Department of Medicine, University of Massachusetts Medical School, Worcester, MA 01605
| | - Aditya Ambade
- Department of Medicine, University of Massachusetts Medical School, Worcester, MA 01605
| | - Melissa A Fulham
- Department of Medicine, University of Massachusetts Medical School, Worcester, MA 01605
| | - Janhavee Deshpande
- Department of Medicine, University of Massachusetts Medical School, Worcester, MA 01605
| | - Donna Catalano
- Department of Medicine, University of Massachusetts Medical School, Worcester, MA 01605
| | - Pranoti Mandrekar
- Department of Medicine, University of Massachusetts Medical School, Worcester, MA 01605
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