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Schaftenaar FH, van Dam AD, de Bruin G, Depuydt MA, de Mol J, Amersfoort J, Douna H, Meijer M, Kröner MJ, van Santbrink PJ, Bernabé Kleijn MN, van Puijvelde GH, Florea BI, Slütter B, Foks AC, Bot I, Rensen PC, Kuiper J. Immunoproteasomal Inhibition With ONX-0914 Attenuates Atherosclerosis and Reduces White Adipose Tissue Mass and Metabolic Syndrome in Mice. Arterioscler Thromb Vasc Biol 2024; 44:1346-1364. [PMID: 38660806 PMCID: PMC11188635 DOI: 10.1161/atvbaha.123.319701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Accepted: 04/10/2024] [Indexed: 04/26/2024]
Abstract
BACKGROUND Atherosclerosis is the major underlying pathology of cardiovascular disease and is driven by dyslipidemia and inflammation. Inhibition of the immunoproteasome, a proteasome variant that is predominantly expressed by immune cells and plays an important role in antigen presentation, has been shown to have immunosuppressive effects. METHODS We assessed the effect of ONX-0914, an inhibitor of the immunoproteasomal catalytic subunits LMP7 (proteasome subunit β5i/large multifunctional peptidase 7) and LMP2 (proteasome subunit β1i/large multifunctional peptidase 2), on atherosclerosis and metabolism in LDLr-/- and APOE*3-Leiden.CETP mice. RESULTS ONX-0914 treatment significantly reduced atherosclerosis, reduced dendritic cell and macrophage levels and their activation, as well as the levels of antigen-experienced T cells during early plaque formation, and Th1 cells in advanced atherosclerosis in young and aged mice in various immune compartments. Additionally, ONX-0914 treatment led to a strong reduction in white adipose tissue mass and adipocyte progenitors, which coincided with neutrophil and macrophage accumulation in white adipose tissue. ONX-0914 reduced intestinal triglyceride uptake and gastric emptying, likely contributing to the reduction in white adipose tissue mass, as ONX-0914 did not increase energy expenditure or reduce total food intake. Concomitant with the reduction in white adipose tissue mass upon ONX-0914 treatment, we observed improvements in markers of metabolic syndrome, including lowered plasma triglyceride levels, insulin levels, and fasting blood glucose. CONCLUSIONS We propose that immunoproteasomal inhibition reduces 3 major causes underlying cardiovascular disease, dyslipidemia, metabolic syndrome, and inflammation and is a new target in drug development for atherosclerosis treatment.
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MESH Headings
- Animals
- Atherosclerosis/pathology
- Atherosclerosis/prevention & control
- Atherosclerosis/drug therapy
- Atherosclerosis/immunology
- Atherosclerosis/genetics
- Atherosclerosis/metabolism
- Metabolic Syndrome/drug therapy
- Metabolic Syndrome/immunology
- Disease Models, Animal
- Adipose Tissue, White/metabolism
- Adipose Tissue, White/drug effects
- Adipose Tissue, White/pathology
- Receptors, LDL/genetics
- Receptors, LDL/deficiency
- Proteasome Endopeptidase Complex/metabolism
- Mice, Inbred C57BL
- Male
- Proteasome Inhibitors/pharmacology
- Apolipoprotein E3/genetics
- Apolipoprotein E3/metabolism
- Aortic Diseases/prevention & control
- Aortic Diseases/pathology
- Aortic Diseases/genetics
- Aortic Diseases/enzymology
- Aortic Diseases/immunology
- Aortic Diseases/metabolism
- Macrophages/drug effects
- Macrophages/metabolism
- Macrophages/immunology
- Plaque, Atherosclerotic
- Dendritic Cells/drug effects
- Dendritic Cells/immunology
- Dendritic Cells/metabolism
- Mice, Knockout, ApoE
- Mice
- Energy Metabolism/drug effects
- Oligopeptides
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Affiliation(s)
- Frank H. Schaftenaar
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research, the Netherlands (F.H.S., M.A.C.D., J.d.M., J.A., H.D., M.M., M.J.K., P.J.v.S., M.N.A.B.K., G.H.M.v.P., B.S., A.C.F., I.B., J.K.)
| | - Andrea D. van Dam
- Division of Endocrinology, Department of Medicine, Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, the Netherlands (A.D.D., P.C.N.R.)
| | - Gerjan de Bruin
- Department of Chemical Biology, Leiden Institute of Chemistry, the Netherlands (G.d.B., B.I.F.)
| | - Marie A.C. Depuydt
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research, the Netherlands (F.H.S., M.A.C.D., J.d.M., J.A., H.D., M.M., M.J.K., P.J.v.S., M.N.A.B.K., G.H.M.v.P., B.S., A.C.F., I.B., J.K.)
| | - Jill de Mol
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research, the Netherlands (F.H.S., M.A.C.D., J.d.M., J.A., H.D., M.M., M.J.K., P.J.v.S., M.N.A.B.K., G.H.M.v.P., B.S., A.C.F., I.B., J.K.)
| | - Jacob Amersfoort
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research, the Netherlands (F.H.S., M.A.C.D., J.d.M., J.A., H.D., M.M., M.J.K., P.J.v.S., M.N.A.B.K., G.H.M.v.P., B.S., A.C.F., I.B., J.K.)
| | - Hidde Douna
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research, the Netherlands (F.H.S., M.A.C.D., J.d.M., J.A., H.D., M.M., M.J.K., P.J.v.S., M.N.A.B.K., G.H.M.v.P., B.S., A.C.F., I.B., J.K.)
| | - Menno Meijer
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research, the Netherlands (F.H.S., M.A.C.D., J.d.M., J.A., H.D., M.M., M.J.K., P.J.v.S., M.N.A.B.K., G.H.M.v.P., B.S., A.C.F., I.B., J.K.)
| | - Mara J. Kröner
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research, the Netherlands (F.H.S., M.A.C.D., J.d.M., J.A., H.D., M.M., M.J.K., P.J.v.S., M.N.A.B.K., G.H.M.v.P., B.S., A.C.F., I.B., J.K.)
| | - Peter J. van Santbrink
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research, the Netherlands (F.H.S., M.A.C.D., J.d.M., J.A., H.D., M.M., M.J.K., P.J.v.S., M.N.A.B.K., G.H.M.v.P., B.S., A.C.F., I.B., J.K.)
| | - Mireia N.A. Bernabé Kleijn
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research, the Netherlands (F.H.S., M.A.C.D., J.d.M., J.A., H.D., M.M., M.J.K., P.J.v.S., M.N.A.B.K., G.H.M.v.P., B.S., A.C.F., I.B., J.K.)
| | - Gijs H.M. van Puijvelde
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research, the Netherlands (F.H.S., M.A.C.D., J.d.M., J.A., H.D., M.M., M.J.K., P.J.v.S., M.N.A.B.K., G.H.M.v.P., B.S., A.C.F., I.B., J.K.)
| | - Bogdan I. Florea
- Department of Chemical Biology, Leiden Institute of Chemistry, the Netherlands (G.d.B., B.I.F.)
| | - Bram Slütter
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research, the Netherlands (F.H.S., M.A.C.D., J.d.M., J.A., H.D., M.M., M.J.K., P.J.v.S., M.N.A.B.K., G.H.M.v.P., B.S., A.C.F., I.B., J.K.)
| | - Amanda C. Foks
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research, the Netherlands (F.H.S., M.A.C.D., J.d.M., J.A., H.D., M.M., M.J.K., P.J.v.S., M.N.A.B.K., G.H.M.v.P., B.S., A.C.F., I.B., J.K.)
| | - Ilze Bot
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research, the Netherlands (F.H.S., M.A.C.D., J.d.M., J.A., H.D., M.M., M.J.K., P.J.v.S., M.N.A.B.K., G.H.M.v.P., B.S., A.C.F., I.B., J.K.)
| | - Patrick C.N. Rensen
- Division of Endocrinology, Department of Medicine, Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, the Netherlands (A.D.D., P.C.N.R.)
| | - Johan Kuiper
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research, the Netherlands (F.H.S., M.A.C.D., J.d.M., J.A., H.D., M.M., M.J.K., P.J.v.S., M.N.A.B.K., G.H.M.v.P., B.S., A.C.F., I.B., J.K.)
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Qureshi N, Desousa J, Siddiqui AZ, Drees BM, Morrison DC, Qureshi AA. Dysregulation of Gene Expression of Key Signaling Mediators in PBMCs from People with Type 2 Diabetes Mellitus. Int J Mol Sci 2023; 24:2732. [PMID: 36769056 PMCID: PMC9916932 DOI: 10.3390/ijms24032732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 01/17/2023] [Accepted: 01/19/2023] [Indexed: 02/04/2023] Open
Abstract
Diabetes is currently the fifth leading cause of death by disease in the USA. The underlying mechanisms for type 2 Diabetes Mellitus (DM2) and the enhanced susceptibility of such patients to inflammatory disorders and infections remain to be fully defined. We have recently shown that peripheral blood mononuclear cells (PBMCs) from non-diabetic people upregulate expression of inflammatory genes in response to proteasome modulators, such as bacterial lipopolysaccharide (LPS) and soybean lectin (LEC); in contrast, resveratrol (RES) downregulates this response. We hypothesized that LPS and LEC will also elicit a similar upregulation of gene expression of key signaling mediators in (PBMCs) from people with type 2 diabetes (PwD2, with chronic inflammation) ex vivo. Unexpectedly, using next generation sequencing (NGS), we show for the first time, that PBMCs from PwD2 failed to elicit a robust LPS- and LEC-induced gene expression of proteasome subunit LMP7 (PSMB8) and mediators of T cell signaling that were observed in non-diabetic controls. These repressed genes included: PSMB8, PSMB9, interferon-γ, interferon-λ, signal-transducer-and-activator-of-transcription-1 (STAT1), human leukocyte antigen (HLA DQB1, HLA DQA1) molecules, interleukin 12A, tumor necrosis factor-α, transporter associated with antigen processing 1 (TAP1), and several others, which showed a markedly weak upregulation with toxins in PBMCs from PwD2, as compared to those from non-diabetics. Resveratrol (proteasome inhibitor) further downregulated the gene expression of these inflammatory mediators in PBMCs from PwD2. These results might explain why PwD2 may be susceptible to infectious disease. LPS and toxins may be leading to inflammation, insulin resistance, and thus, metabolic changes in the host cells.
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Affiliation(s)
- Nilofer Qureshi
- Department of Biomedical Sciences, Shock/Trauma Research Center, School of Medicine, University of Missouri-Kansas City, 2411 Holmes Street, Kansas City, MO 64108, USA
- Department of Pharmacology/Toxicology, School of Pharmacy, University of Missouri-Kansas City, Kansas City, MO 64108, USA
| | - Julia Desousa
- Department of Biomedical Sciences, Shock/Trauma Research Center, School of Medicine, University of Missouri-Kansas City, 2411 Holmes Street, Kansas City, MO 64108, USA
- Department of Pharmacology/Toxicology, School of Pharmacy, University of Missouri-Kansas City, Kansas City, MO 64108, USA
| | - Adeela Z. Siddiqui
- Department of Biomedical Sciences, Shock/Trauma Research Center, School of Medicine, University of Missouri-Kansas City, 2411 Holmes Street, Kansas City, MO 64108, USA
| | - Betty M. Drees
- Internal Medicine, School of Medicine, University of Missouri-Kansas City, 2411 Holmes Street, Kansas City, MO 64108, USA
| | - David C. Morrison
- Department of Biomedical Sciences, Shock/Trauma Research Center, School of Medicine, University of Missouri-Kansas City, 2411 Holmes Street, Kansas City, MO 64108, USA
| | - Asaf A. Qureshi
- Department of Biomedical Sciences, Shock/Trauma Research Center, School of Medicine, University of Missouri-Kansas City, 2411 Holmes Street, Kansas City, MO 64108, USA
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Reprograming of Gene Expression of Key Inflammatory Signaling Pathways in Human Peripheral Blood Mononuclear Cells by Soybean Lectin and Resveratrol. Int J Mol Sci 2022; 23:ijms232112946. [DOI: 10.3390/ijms232112946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 10/17/2022] [Accepted: 10/20/2022] [Indexed: 11/16/2022] Open
Abstract
Inflammation is linked to several human diseases like microbial infections, cancer, heart disease, asthma, diabetes, and neurological disorders. We have shown that the prototype inflammatory agonist LPS modulates the activity of Ubiquitin-Proteasome System (UPS) and regulates transcription factors such as NF-κB, leading to inflammation, tolerance, hypoxia, autophagy, and apoptosis of cells. We hypothesized that proteasome modulators resveratrol and soybean lectin would alter the gene expression of mediators involved in inflammation-induced signaling pathways, when administered ex vivo to human peripheral blood mononuclear blood cells (PBMCs) obtained from normal healthy controls. To test this hypothesis, analysis of RNA derived from LPS-treated human PBMCs, with or without resveratrol and soybean lectin, was carried out using Next Generation Sequencing (NGS). Collectively, the findings described herein suggest that proteasome modulators, resveratrol (proteasome inhibitor) and lectins (proteasome activator), have a profound capacity to modulate cytokine expression in response to proteasome modulators, as well as expression of mediators in multiple signaling pathways in PBMCs of control subjects. We show for the first-time that resveratrol downregulates expression of mediators involved in several key signaling pathways IFN-γ, IL-4, PSMB8 (LMP7), and a subset of LPS-induced genes, while lectins induced IFN-γ, IL-4, PSMB8, and many of the same genes as LPS that are important for innate and adaptive immunity. These findings suggest that inflammation may be influenced by common dietary components and this knowledge may be used to prevent or reverse inflammation-based diseases.
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Tripathi SC, Vedpathak D, Ostrin EJ. The Functional and Mechanistic Roles of Immunoproteasome Subunits in Cancer. Cells 2021; 10:cells10123587. [PMID: 34944095 PMCID: PMC8700164 DOI: 10.3390/cells10123587] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Revised: 12/09/2021] [Accepted: 12/13/2021] [Indexed: 12/15/2022] Open
Abstract
Cell-mediated immunity is driven by antigenic peptide presentation on major histocompatibility complex (MHC) molecules. Specialized proteasome complexes called immunoproteasomes process viral, bacterial, and tumor antigens for presentation on MHC class I molecules, which can induce CD8 T cells to mount effective immune responses. Immunoproteasomes are distinguished by three subunits that alter the catalytic activity of the proteasome and are inducible by inflammatory stimuli such as interferon-γ (IFN-γ). This inducible activity places them in central roles in cancer, autoimmunity, and inflammation. While accelerated proteasomal degradation is an important tumorigenic mechanism deployed by several cancers, there is some ambiguity regarding the role of immunoproteasome induction in neoplastic transformation. Understanding the mechanistic and functional relevance of the immunoproteasome provides essential insights into developing targeted therapies, including overcoming resistance to standard proteasome inhibition and immunomodulation of the tumor microenvironment. In this review, we discuss the roles of the immunoproteasome in different cancers.
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Affiliation(s)
- Satyendra Chandra Tripathi
- Department of Biochemistry, All India Institute of Medical Sciences Nagpur, Nagpur 441108, MH, India;
- Correspondence: (S.C.T.); (E.J.O.)
| | - Disha Vedpathak
- Department of Biochemistry, All India Institute of Medical Sciences Nagpur, Nagpur 441108, MH, India;
| | - Edwin Justin Ostrin
- Department of General Internal Medicine, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
- Correspondence: (S.C.T.); (E.J.O.)
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Blood Immunoproteasome Activity Is Regulated by Sex, Age and in Chronic Inflammatory Diseases: A First Population-Based Study. Cells 2021; 10:cells10123336. [PMID: 34943847 PMCID: PMC8699521 DOI: 10.3390/cells10123336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 11/21/2021] [Accepted: 11/25/2021] [Indexed: 11/30/2022] Open
Abstract
Dysfunction of the immunoproteasome has been implicated in cardiovascular and pulmonary diseases. Its potential as a biomarker for predicting disease stages, however, has not been investigated so far and population-based analyses on the impact of sex and age are missing. We here analyzed the activity of all six catalytic sites of the proteasome in isolated peripheral blood mononuclear cells obtained from 873 study participants of the KORA FF4 study using activity-based probes. The activity of the immuno- and standard proteasome correlated clearly with elevated leukocyte counts of study participants. Unexpectedly, we observed a strong sex dimorphism for proteasome activity with significantly lower immunoproteasome activity in women. In aging, almost all catalytic activities of the proteasome were activated in aged women while maintained upon aging in men. We also noted distinct sex-related activation patterns of standard and immunoproteasome active sites in chronic inflammatory diseases such as diabetes, cardiovascular diseases, asthma, or chronic obstructive pulmonary disease as determined by multiple linear regression modeling. Our data thus provides a conceptual framework for future analysis of immunoproteasome function as a bio-marker for chronic inflammatory disease development and progression.
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Johnston-Carey HK, Pomatto LCD, Davies KJA. The Immunoproteasome in oxidative stress, aging, and disease. Crit Rev Biochem Mol Biol 2016; 51:268-81. [PMID: 27098648 DOI: 10.3109/10409238.2016.1172554] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The Immunoproteasome has traditionally been viewed primarily for its role in peptide production for antigen presentation by the major histocompatibility complex, which is critical for immunity. However, recent research has shown that the Immunoproteasome is also very important for the clearance of oxidatively damaged proteins in homeostasis, and especially during stress and disease. The importance of the Immunoproteasome in protein degradation has become more evident as diseases characterized by protein aggregates have also been linked to deficiencies of the Immunoproteasome. Additionally, there are now diseases defined by mutations or polymorphisms within Immunoproteasome-specific subunit genes, further suggesting its crucial role in cytokine signaling and protein homeostasis (or "proteostasis"). The purpose of this review is to highlight our growing understanding of the importance of the Immunoproteasome in the management of protein quality control, and the detrimental impact of its dysregulation during disease and aging.
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Affiliation(s)
- Helen K Johnston-Carey
- a Leonard Davis School of Gerontology of the Ethel Percy Andrus Gerontology Center , The University of Southern California , Los Angeles , CA , USA
| | - Laura C D Pomatto
- a Leonard Davis School of Gerontology of the Ethel Percy Andrus Gerontology Center , The University of Southern California , Los Angeles , CA , USA
| | - Kelvin J A Davies
- a Leonard Davis School of Gerontology of the Ethel Percy Andrus Gerontology Center , The University of Southern California , Los Angeles , CA , USA ;,b Division of Molecular & Computational Biology, Department of Biological Sciences, Dornsife College of Letters, Arts, & Sciences , Los Angeles , CA , USA
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Meiners S, Keller IE, Semren N, Caniard A. Regulation of the proteasome: evaluating the lung proteasome as a new therapeutic target. Antioxid Redox Signal 2014; 21:2364-82. [PMID: 24437504 DOI: 10.1089/ars.2013.5798] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
SIGNIFICANCE Lung diseases are on the second rank worldwide with respect to morbidity and mortality. For most respiratory diseases, no effective therapies exist. Whereas the proteasome has been successfully evaluated as a novel target for therapeutic interventions in cancer, neurodegenerative, and cardiac disorders, there is a profound lack of knowledge on the regulation of proteasome activity in chronic and acute lung diseases. RECENT ADVANCES There are various means of how the amount of active proteasome complexes in the cell can be regulated such as transcriptional regulation of proteasomal subunit expression, association with different regulators, assembly and half-life of proteasomes and regulatory complexes, as well as post-translational modifications. It also becomes increasingly evident that proteasome activity is fine-tuned and depends on the state of the cell. We propose here that 20S proteasomes and their regulators can be regarded as dynamic building blocks, which assemble or disassemble in response to cellular needs. The composition of proteasome complexes in a cell may vary depending on tissue, cell type and compartment, stage of development, or pathological context. CRITICAL ISSUES AND FUTURE DIRECTIONS Dissecting the expression and regulation of the various catalytic forms of 20S proteasomes, such as constitutive, immuno-, and mixed proteasomes, together with their associated regulatory complexes will not only greatly enhance our understanding of proteasome function in lung pathogenesis but will also pave the way to develop new classes of drugs that inhibit or activate proteasome function in a defined setting for treatment of lung diseases.
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Affiliation(s)
- Silke Meiners
- Comprehensive Pneumology Center (CPC), University Hospital , Ludwig-Maximilians University, Helmholtz Zentrum München, Member of the German Center for Lung Research (DZL), Munich, Germany
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Upregulation of immunoproteasome subunits in myositis indicates active inflammation with involvement of antigen presenting cells, CD8 T-cells and IFNΓ. PLoS One 2014; 9:e104048. [PMID: 25098831 PMCID: PMC4123911 DOI: 10.1371/journal.pone.0104048] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Accepted: 07/06/2014] [Indexed: 12/24/2022] Open
Abstract
Objective In idiopathic inflammatory myopathies (IIM) infiltration of immune cells into muscle and upregulation of MHC-I expression implies increased antigen presentation and involvement of the proteasome system. To decipher the role of immunoproteasomes in myositis, we investigated individual cell types and muscle tissues and focused on possible immune triggers. Methods Expression of constitutive (PSMB5, -6, -7) and corresponding immunoproteasomal subunits (PSMB8, -9, -10) was analyzed by real-time RT-PCR in muscle biopsies and sorted peripheral blood cells of patients with IIM, non-inflammatory myopathies (NIM) and healthy donors (HD). Protein analysis in muscle biopsies was performed by western blot. Affymetrix HG-U133 platform derived transcriptome data from biopsies of different muscle diseases and from immune cell types as well as monocyte stimulation experiments were used for validation, coregulation and coexpression analyses. Results Real-time RT-PCR revealed significantly increased expression of immunoproteasomal subunits (PSMB8/-9/-10) in DC, monocytes and CD8+ T-cells in IIM. In muscle biopsies, the immunosubunits were elevated in IIM compared to NIM and exceeded levels of matched blood samples. Proteins of PSMB8 and -9 were found only in IIM but not NIM muscle biopsies. Reanalysis of 78 myositis and 20 healthy muscle transcriptomes confirmed these results and revealed involvement of the antigen processing and presentation pathway. Comparison with reference profiles of sorted immune cells and healthy muscle confirmed upregulation of PSMB8 and -9 in myositis biopsies beyond infiltration related changes. This upregulation correlated highest with STAT1, IRF1 and IFNγ expression. Elevation of T-cell specific transcripts in active IIM muscles was accompanied by increased expression of DC and monocyte marker genes and thus reflects the cell type specific involvement observed in peripheral blood. Conclusions Immunoproteasomes seem to indicate IIM activity and suggest that dominant involvement of antigen processing and presentation may qualify these diseases exemplarily for the evolving therapeutic concepts of immunoproteasome specific inhibition.
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Abstract
Over the years, the proteasome has been extensively investigated due to its crucial roles in many important signaling pathways and its implications in diseases. Two proteasome inhibitors--bortezomib and carfilzomib--have received FDA approval for the treatment of multiple myeloma, thereby validating the proteasome as a chemotherapeutic target. As a result, further research efforts have been focused on dissecting the complex biology of the proteasome to gain the insight required for developing next-generation proteasome inhibitors. It is clear that chemical probes have made significant contributions to these efforts, mostly by functioning as inhibitors that selectively block the catalytic activity of proteasomes. Analogues of these inhibitors are now providing additional tools for visualization of catalytically active proteasome subunits, several of which allow real-time monitoring of proteasome activity in living cells as well as in in vivo settings. These imaging probes will provide powerful tools for assessing the efficacy of proteasome inhibitors in clinical settings. In this review, we will focus on the recent efforts towards developing imaging probes of proteasomes, including the latest developments in immunoproteasome-selective imaging probes.
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Basler M, Mundt S, Muchamuel T, Moll C, Jiang J, Groettrup M, Kirk CJ. Inhibition of the immunoproteasome ameliorates experimental autoimmune encephalomyelitis. EMBO Mol Med 2014; 6:226-38. [PMID: 24399752 PMCID: PMC3927957 DOI: 10.1002/emmm.201303543] [Citation(s) in RCA: 125] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Multiple sclerosis (MS) is a chronic demyelinating immune mediated disease of the central nervous system. The immunoproteasome is a distinct class of proteasomes found predominantly in monocytes and lymphocytes. Recently, we demonstrated a novel function of immunoproteasomes in cytokine production and T cell differentiation. In this study, we investigated the therapeutic efficacy of an inhibitor of the immunoproteasome (ONX 0914) in two different mouse models of MS. ONX 0914 attenuated disease progression after active and passive induction of experimental autoimmune encephalomyelitis (EAE), both in MOG35–55 and PLP139–151-induced EAE. Isolation of lymphocytes from the brain or spinal cord revealed a strong reduction of cytokine-producing CD4+ cells in ONX 0914 treated mice. Additionally, ONX 0914 treatment prevented disease exacerbation in a relapsing-remitting model. An analysis of draining lymph nodes after induction of EAE revealed that the differentiation to Th17 or Th1 cells was strongly impaired in ONX 0914 treated mice. These results implicate the immunoproteasome in the development of EAE and suggest that immunoproteasome inhibitors are promising drugs for the treatment of MS.
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Affiliation(s)
- Michael Basler
- Biotechnology Institute Thurgau (BITg) at the University of Konstanz, Kreuzlingen, Switzerland
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The immunoproteasome in antigen processing and other immunological functions. Curr Opin Immunol 2012; 25:74-80. [PMID: 23219269 DOI: 10.1016/j.coi.2012.11.004] [Citation(s) in RCA: 168] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2012] [Revised: 11/12/2012] [Accepted: 11/13/2012] [Indexed: 01/30/2023]
Abstract
Treatment of cells with interferon-γ leads to the replacement of the constitutive catalytic proteasome subunits β1, β2, and β5 by the inducible subunits LMP2 (β1i), MECL-1 (β2i), and LMP7 (β5i), respectively, building the so-called immunoproteasome. The incorporation of these subunits is required for the production of numerous MHC class-I restricted T cell epitopes. Recently, new evidence for an involvement of the immunoproteasome in other facets of the immune response emerged. Investigations of autoimmune diseases in animal models and a genetic predisposition of β5i in human autoimmune disorders suggest a crucial function of the immunoproteasome in proinflammatory diseases. The recent elucidation of the high-resolution structure of the immunoproteasome will facilitate the design of immunoproteasome selective inhibitors for pharmacological intervention.
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Sharma LK, Lee NR, Jang ER, Lei B, Zhan CG, Lee W, Kim KB. Activity-based near-infrared fluorescent probe for LMP7: a chemical proteomics tool for the immunoproteasome in living cells. Chembiochem 2012; 13:1899-903. [PMID: 22807337 DOI: 10.1002/cbic.201200307] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Indexed: 01/08/2023]
Abstract
Probing the unknown: The immunoproteasome, an alternative form of the constitutive proteasome, has been implicated in a number of pathological states such as cancer and autoimmune diseases. In an effort to understand the role of the immunoproteasome in cells, the first immunoproteasome-specific near-infrared fluorescent probe has been developed.
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Affiliation(s)
- Lalit Kumar Sharma
- Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA
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Qureshi N, Morrison DC, Reis J. Proteasome protease mediated regulation of cytokine induction and inflammation. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2012; 1823:2087-93. [PMID: 22728331 DOI: 10.1016/j.bbamcr.2012.06.016] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 04/11/2012] [Revised: 06/05/2012] [Accepted: 06/07/2012] [Indexed: 01/16/2023]
Abstract
We have previously demonstrated that proteasome serves as a central regulator of inflammation and macrophage function. Until recently, proteasomes have generally been considered to play a relatively passive role in the regulation of cellular activity, i.e., any ubiquitinated protein was considered to be in discriminatively targeted for degradation by the proteasome. We have demonstrated, however, by using specific proteasome protease inhibitors and knockout mice lacking specific components of immunoproteasomes, that proteasomes (containing X, Y, and Z protease subunits) and immunoproteasomes (containing LMP7, LMP2, and LMP10 protease subunits) have well-defined functions in cytokine induction and inflammation based on their individual protease activities. We have also shown that LPS-TLR mediated signaling in the murine RAW 264.7 macrophage cell line results in the replacement of macrophage immunoproteasomal subunits. Such modifications serve as pivotal regulators of LPS-induced inflammation. Our findings support the relatively novel concept that defects in structure/function of proteasome protease subunits caused by genetic disorders, aging, diet, or drugs may well have the potential to contribute to modulation of proteasome activity. Of particular relevance, we have identified quercetin and resveratrol, significant constituents present in berries and in red wine respectively, as two novel proteasome inhibitors that have been previously implicated as disease-modifying natural products. We posit that natural proteasome inhibitors/activators can potentially be used as therapeutic response modifiers to prevent/treat diseases through pathways involving the ubiquitin-proteasome pathway (UP-pathway), which likely functions as a master regulator involved in control of overall inflammatory responses. This article is part of a Special Issue entitled: Ubiquitin Drug Discovery and Diagnostics.
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Affiliation(s)
- Nilofer Qureshi
- Department of Basic Medical Sciences, University of Missouri, Kansas City, MO 64108, USA.
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