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Nie Y, Ma Z, Zhang B, Sun M, Zhang D, Li HH, Song X. The role of the immunoproteasome in cardiovascular disease. Pharmacol Res 2024; 204:107215. [PMID: 38744399 DOI: 10.1016/j.phrs.2024.107215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 05/10/2024] [Accepted: 05/10/2024] [Indexed: 05/16/2024]
Abstract
The ubiquitinproteasome system (UPS) is the main mechanism responsible for the intracellular degradation of misfolded or damaged proteins. Under inflammatory conditions, the immunoproteasome, an isoform of the proteasome, can be induced, enhancing the antigen-presenting function of the UPS. Furthermore, the immunoproteasome also serves nonimmune functions, such as maintaining protein homeostasis and regulating signalling pathways, and is involved in the pathophysiological processes of various cardiovascular diseases (CVDs). This review aims to provide a comprehensive summary of the current research on the involvement of the immunoproteasome in cardiovascular diseases, with the ultimate goal of identifying novel strategies for the treatment of these conditions.
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Affiliation(s)
- Yifei Nie
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China.
| | - Zhao Ma
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China.
| | - Baoen Zhang
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China.
| | - Meichen Sun
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China.
| | - Dongfeng Zhang
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China.
| | - Hui-Hua Li
- Department of Emergency Medicine, Beijing Key Laboratory of Cardiopulmonary Cerebral Resuscitation, Beijing Chao-Yang Hospital, Capital Medical University, Beijing 100020, China.
| | - Xiantao Song
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China.
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2
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Guo B, Zheng C, Cao J, Qiu X, Luo F, Li H, Lee SM, Yang X, Zhang G, Sun Y, Zhang Z, Wang Y. Tetramethylpyrazine Nitrone Promotes the Clearance of Alpha-Synuclein via Nrf2-Mediated Ubiquitin-Proteasome System Activation. Neuromolecular Med 2024; 26:9. [PMID: 38568291 DOI: 10.1007/s12017-024-08775-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Accepted: 02/21/2024] [Indexed: 04/05/2024]
Abstract
Aggregation of α-synuclein (α-syn) and α-syn cytotoxicity are hallmarks of sporadic and familial Parkinson's disease (PD). Nuclear factor (erythroid-derived 2)-like 2 (Nrf2)-dependent enhancement of the expression of the 20S proteasome core particles (20S CPs) and regulatory particles (RPs) increases proteasome activity, which can promote α-syn clearance in PD. Activation of peroxisome proliferator-activated receptor γ co-activator 1α (PGC-1α) may reduce oxidative stress by strongly inducing Nrf2 gene expression. In the present study, tetramethylpyrazine nitrone (TBN), a potent-free radical scavenger, promoted α-syn clearance by the ubiquitin-proteasome system (UPS) in cell models overexpressing the human A53T mutant α-syn. In the α-syn transgenic mice model, TBN improved motor impairment, decreased the products of oxidative damage, and down-regulated the α-syn level in the serum. TBN consistently up-regulated PGC-1α and Nrf2 expression in tested models of PD. Additionally, TBN similarly enhanced the proteasome 20S subunit beta 8 (Psmb8) expression, which is linked to chymotrypsin-like proteasome activity. Furthermore, TBN increased the mRNA levels of both the 11S RPs subunits Pa28αβ and a proteasome chaperone, known as the proteasome maturation protein (Pomp). Interestingly, specific siRNA targeting of Nrf2 blocked TBN's effects on Psmb8, Pa28αβ, Pomp expression, and α-syn clearance. In conclusion, TBN promotes the clearance of α-syn via Nrf2-mediated UPS activation, and it may serve as a potentially disease-modifying therapeutic agent for PD.
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Affiliation(s)
- Baojian Guo
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangzhou Key Laboratory of Innovative Chemical Drug Research in Cardio-Cerebrovascular Diseases, and Institute of New Drug Research, Jinan University College of Pharmacy, 601# Huangpu Road, Guangzhou, 510632, China
| | - Chengyou Zheng
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangzhou Key Laboratory of Innovative Chemical Drug Research in Cardio-Cerebrovascular Diseases, and Institute of New Drug Research, Jinan University College of Pharmacy, 601# Huangpu Road, Guangzhou, 510632, China
- School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen, 518055, China
| | - Jie Cao
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangzhou Key Laboratory of Innovative Chemical Drug Research in Cardio-Cerebrovascular Diseases, and Institute of New Drug Research, Jinan University College of Pharmacy, 601# Huangpu Road, Guangzhou, 510632, China
| | - Xiaoling Qiu
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangzhou Key Laboratory of Innovative Chemical Drug Research in Cardio-Cerebrovascular Diseases, and Institute of New Drug Research, Jinan University College of Pharmacy, 601# Huangpu Road, Guangzhou, 510632, China
| | - Fangcheng Luo
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangzhou Key Laboratory of Innovative Chemical Drug Research in Cardio-Cerebrovascular Diseases, and Institute of New Drug Research, Jinan University College of Pharmacy, 601# Huangpu Road, Guangzhou, 510632, China
| | - Haitao Li
- Department of Bioengineering, Zhuhai Campus of Zunyi Medical University, Zhuhai, 519041, China
| | - Simon Mingyuan Lee
- Institute of Chinese Medical Sciences and State Key Laboratory of Quality Research in Chinese Medicine, University of Macau, Avenida da Universidade, Taipa, 999078, Macao SAR, China
| | - Xifei Yang
- Key Laboratory of Modern Toxicology of Shenzhen, Center for Disease Control and Prevention, No. 8, Longyuan Road, Nanshan District, Shenzhen, 518055, China
| | - Gaoxiao Zhang
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangzhou Key Laboratory of Innovative Chemical Drug Research in Cardio-Cerebrovascular Diseases, and Institute of New Drug Research, Jinan University College of Pharmacy, 601# Huangpu Road, Guangzhou, 510632, China
| | - Yewei Sun
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangzhou Key Laboratory of Innovative Chemical Drug Research in Cardio-Cerebrovascular Diseases, and Institute of New Drug Research, Jinan University College of Pharmacy, 601# Huangpu Road, Guangzhou, 510632, China.
| | - Zaijun Zhang
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangzhou Key Laboratory of Innovative Chemical Drug Research in Cardio-Cerebrovascular Diseases, and Institute of New Drug Research, Jinan University College of Pharmacy, 601# Huangpu Road, Guangzhou, 510632, China.
| | - Yuqiang Wang
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangzhou Key Laboratory of Innovative Chemical Drug Research in Cardio-Cerebrovascular Diseases, and Institute of New Drug Research, Jinan University College of Pharmacy, 601# Huangpu Road, Guangzhou, 510632, China
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3
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Kim Y, Kim EK, Chey Y, Song MJ, Jang HH. Targeted Protein Degradation: Principles and Applications of the Proteasome. Cells 2023; 12:1846. [PMID: 37508510 PMCID: PMC10378610 DOI: 10.3390/cells12141846] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 07/10/2023] [Accepted: 07/12/2023] [Indexed: 07/30/2023] Open
Abstract
The proteasome is a multi-catalytic protease complex that is involved in protein quality control via three proteolytic activities (i.e., caspase-, trypsin-, and chymotrypsin-like activities). Most cellular proteins are selectively degraded by the proteasome via ubiquitination. Moreover, the ubiquitin-proteasome system is a critical process for maintaining protein homeostasis. Here, we briefly summarize the structure of the proteasome, its regulatory mechanisms, proteins that regulate proteasome activity, and alterations to proteasome activity found in diverse diseases, chemoresistant cells, and cancer stem cells. Finally, we describe potential therapeutic modalities that use the ubiquitin-proteasome system.
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Affiliation(s)
- Yosup Kim
- Department of Biochemistry, College of Medicine, Gachon University, Incheon 21999, Republic of Korea
| | - Eun-Kyung Kim
- Department of Biochemistry, College of Medicine, Gachon University, Incheon 21999, Republic of Korea
| | - Yoona Chey
- Department of Biochemistry, College of Medicine, Gachon University, Incheon 21999, Republic of Korea
| | - Min-Jeong Song
- Department of Biochemistry, College of Medicine, Gachon University, Incheon 21999, Republic of Korea
| | - Ho Hee Jang
- Department of Biochemistry, College of Medicine, Gachon University, Incheon 21999, Republic of Korea
- Department of Health Sciences and Technology, Gachon Advanced Institute for Health Sciences and Technology (GAIHST), Gachon University, Incheon 21999, Republic of Korea
- Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon 21999, Republic of Korea
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4
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MHC-dressing on dendritic cells: Boosting anti-tumor immunity via unconventional tumor antigen presentation. Semin Immunol 2023; 66:101710. [PMID: 36640616 DOI: 10.1016/j.smim.2023.101710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 12/21/2022] [Accepted: 01/07/2023] [Indexed: 01/15/2023]
Abstract
Dendritic cells are crucial for anti-tumor immune responses due to their ability to activate cytotoxic effector CD8+ T cells. Canonically, in anti-tumor immunity, dendritic cells activate CD8+ T cells in a process termed cross-presentation. Recent studies have demonstrated that another type of antigen presentation, MHC-dressing, also serves to activate CD8+ T cells against tumor cell-derived antigens. Understanding MHC-dressing's specific contributions to anti-tumor immunity can open up novel therapeutic avenues. In this review, we summarize the early studies that identified MHC-dressing as a relevant antigen presentation pathway before diving into a deeper discussion of the biology of MHC-dressing, focusing in particular on which dendritic cell subsets are most capable of performing MHC-dressing and how MHC-dressing compares to other forms of antigen presentation. We conclude by discussing the implications MHC-dressing has for anti-tumor immunity.
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5
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Targeting immunoproteasome in neurodegeneration: A glance to the future. Pharmacol Ther 2023; 241:108329. [PMID: 36526014 DOI: 10.1016/j.pharmthera.2022.108329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 12/02/2022] [Accepted: 12/05/2022] [Indexed: 12/15/2022]
Abstract
The immunoproteasome is a specialized form of proteasome equipped with modified catalytic subunits that was initially discovered to play a pivotal role in MHC class I antigen processing and immune system modulation. However, over the last years, this proteolytic complex has been uncovered to serve additional functions unrelated to antigen presentation. Accordingly, it has been proposed that immunoproteasome synergizes with canonical proteasome in different cell types of the nervous system, regulating neurotransmission, metabolic pathways and adaptation of the cells to redox or inflammatory insults. Hence, studying the alterations of immunoproteasome expression and activity is gaining research interest to define the dynamics of neuroinflammation as well as the early and late molecular events that are likely involved in the pathogenesis of a variety of neurological disorders. Furthermore, these novel functions foster the perspective of immunoproteasome as a potential therapeutic target for neurodegeneration. In this review, we provide a brain and retina-wide overview, trying to correlate present knowledge on structure-function relationships of immunoproteasome with the variety of observed neuro-modulatory functions.
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6
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Niescierowicz K, Pryszcz L, Navarrete C, Tralle E, Sulej A, Abu Nahia K, Kasprzyk ME, Misztal K, Pateria A, Pakuła A, Bochtler M, Winata C. Adar-mediated A-to-I editing is required for embryonic patterning and innate immune response regulation in zebrafish. Nat Commun 2022; 13:5520. [PMID: 36127363 PMCID: PMC9489775 DOI: 10.1038/s41467-022-33260-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 09/09/2022] [Indexed: 11/09/2022] Open
Abstract
Adenosine deaminases (ADARs) catalyze the deamination of adenosine to inosine, also known as A-to-I editing, in RNA. Although A-to-I editing occurs widely across animals and is well studied, new biological roles are still being discovered. Here, we study the role of A-to-I editing in early zebrafish development. We demonstrate that Adar, the zebrafish orthologue of mammalian ADAR1, is essential for establishing the antero-posterior and dorso-ventral axes and patterning. Genome-wide editing discovery reveals pervasive editing in maternal and the earliest zygotic transcripts, the majority of which occurred in the 3'-UTR. Interestingly, transcripts implicated in gastrulation as well as dorso-ventral and antero-posterior patterning are found to contain multiple editing sites. Adar knockdown or overexpression affect gene expression by 12 hpf. Analysis of adar-/- zygotic mutants further reveals that the previously described role of Adar in mammals in regulating the innate immune response is conserved in zebrafish. Our study therefore establishes distinct maternal and zygotic functions of RNA editing by Adar in embryonic patterning along the zebrafish antero-posterior and dorso-ventral axes, and in the regulation of the innate immune response, respectively.
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Affiliation(s)
| | - Leszek Pryszcz
- International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland
| | - Cristina Navarrete
- International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland
| | - Eugeniusz Tralle
- International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland
| | - Agata Sulej
- International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland
| | - Karim Abu Nahia
- International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland
| | - Marta Elżbieta Kasprzyk
- International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland.,Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - Katarzyna Misztal
- International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland
| | - Abhishek Pateria
- International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland
| | - Adrianna Pakuła
- International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland
| | - Matthias Bochtler
- International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland. .,Polish Academy of Sciences, Institute of Biochemistry and Biophysics, Warsaw, Poland.
| | - Cecilia Winata
- International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland.
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7
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Sasaki Y, Arimochi H, Otsuka K, Kondo H, Tsukumo SI, Yasutomo K. Blockade of the CXCR3/CXCL10 axis ameliorates inflammation caused by immunoproteasome dysfunction. JCI Insight 2022; 7:152681. [PMID: 35393946 PMCID: PMC9057626 DOI: 10.1172/jci.insight.152681] [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: 06/25/2021] [Accepted: 02/23/2022] [Indexed: 11/17/2022] Open
Abstract
Immunoproteasomes regulate the degradation of ubiquitin-coupled proteins and generate peptides that are preferentially presented by MHC class I. Mutations in immunoproteasome subunits lead to immunoproteasome dysfunction, which causes proteasome-associated autoinflammatory syndromes (PRAAS) characterized by nodular erythema and partial lipodystrophy. It remains unclear, however, how immunoproteasome dysfunction leads to inflammatory symptoms. Here, we established mice harboring a mutation in Psmb8 (Psmb8-KI mice) and addressed this question. Psmb8-KI mice showed higher susceptibility to imiquimod-induced skin inflammation (IMS). Blockade of IL-6 or TNF-α partially suppressed IMS in both control and Psmb8-KI mice, but there was still more residual inflammation in the Psmb8-KI mice than in the control mice. DNA microarray analysis showed that treatment of J774 cells with proteasome inhibitors increased the expression of the Cxcl9 and Cxcl10 genes. Deficiency in Cxcr3, the gene encoding the receptor of CXCL9 and CXCL10, in control mice did not change IMS susceptibility, while deficiency in Cxcr3 in Psmb8-KI mice ameliorated IMS. Taken together, these findings demonstrate that this mutation in Psmb8 leads to hyperactivation of the CXCR3 pathway, which is responsible for the increased susceptibility of Psmb8-KI mice to IMS. These data suggest the CXCR3/CXCL10 axis as a new molecular target for treating PRAAS.
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Affiliation(s)
- Yuki Sasaki
- Department of Immunology and Parasitology, Graduate School of Medicine
| | - Hideki Arimochi
- Department of Immunology and Parasitology, Graduate School of Medicine
| | - Kunihiro Otsuka
- Department of Immunology and Parasitology, Graduate School of Medicine.,Department of Interdisciplinary Research for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima, and
| | - Hiroyuki Kondo
- Department of Immunology and Parasitology, Graduate School of Medicine
| | - Shin-Ichi Tsukumo
- Department of Immunology and Parasitology, Graduate School of Medicine.,Department of Interdisciplinary Research for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima, and
| | - Koji Yasutomo
- Department of Immunology and Parasitology, Graduate School of Medicine.,Department of Interdisciplinary Research for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima, and.,The Research Cluster Program on Immunological Diseases, Tokushima University, Tokushima, Japan
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8
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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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9
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Immunoproteasome Function in Normal and Malignant Hematopoiesis. Cells 2021; 10:cells10071577. [PMID: 34206607 PMCID: PMC8305381 DOI: 10.3390/cells10071577] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 06/16/2021] [Accepted: 06/16/2021] [Indexed: 12/19/2022] Open
Abstract
The ubiquitin-proteasome system (UPS) is a central part of protein homeostasis, degrading not only misfolded or oxidized proteins but also proteins with essential functions. The fact that a healthy hematopoietic system relies on the regulation of protein homeostasis and that alterations in the UPS can lead to malignant transformation makes the UPS an attractive therapeutic target for the treatment of hematologic malignancies. Herein, inhibitors of the proteasome, the last and most important component of the UPS enzymatic cascade, have been approved for the treatment of these malignancies. However, their use has been associated with side effects, drug resistance, and relapse. Inhibitors of the immunoproteasome, a proteasomal variant constitutively expressed in the cells of hematopoietic origin, could potentially overcome the encountered problems of non-selective proteasome inhibition. Immunoproteasome inhibitors have demonstrated their efficacy and safety against inflammatory and autoimmune diseases, even though their development for the treatment of hematologic malignancies is still in the early phases. Various immunoproteasome inhibitors have shown promising preliminary results in pre-clinical studies, and one inhibitor is currently being investigated in clinical trials for the treatment of multiple myeloma. Here, we will review data on immunoproteasome function and inhibition in hematopoietic cells and hematologic cancers.
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10
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Kasahara M. Role of immunoproteasomes and thymoproteasomes in health and disease. Pathol Int 2021; 71:371-382. [PMID: 33657242 DOI: 10.1111/pin.13088] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 02/11/2021] [Indexed: 12/14/2022]
Abstract
The proteasome is a multisubunit protease that degrades intracellular proteins into small peptides. Besides playing a pivotal role in many cellular processes indispensable for survival, it is involved in the production of peptides presented by major histocompatibility complex class I molecules. In addition to the standard proteasome shared in all eukaryotes, jawed vertebrates have two specialized forms of proteasome known as immunoproteasomes and thymoproteasomes. The immunoproteasome, which contains cytokine-inducible catalytic subunits with distinct cleavage specificities, produces peptides presented by class I molecules more efficiently than the standard proteasome. The thymoproteasome, which contains a unique catalytic subunit β5t, is a tissue-specific proteasome expressed exclusively in cortical thymic epithelial cells. It plays a critical role in CD8+ cytotoxic T cell development via positive selection. This review provides a brief overview on the structure and function of these specialized forms of proteasome and their involvement in human disease.
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Affiliation(s)
- Masanori Kasahara
- Department of Pathology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Hokkaido, Japan
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11
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Wang Y, Yan K, Lin J, Liu Y, Wang J, Li X, Li X, Hua Z, Zheng Z, Shi J, Sun S, Bi J. CD8+ T Cell Co-Expressed Genes Correlate With Clinical Phenotype and Microenvironments of Urothelial Cancer. Front Oncol 2020; 10:553399. [PMID: 33330025 PMCID: PMC7713665 DOI: 10.3389/fonc.2020.553399] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Accepted: 10/20/2020] [Indexed: 01/05/2023] Open
Abstract
Purpose To identify immune-related co-expressed genes that promote CD8+ T cell infiltration in bladder cancer, and to explore the interactions among relevant genes in the tumor microenvironment. Method We obtained bladder cancer gene matrix and clinical information data from TCGA, GSE32894 and GSE48075. The “estimate” package was used to calculate tumor purity and immune score. The CIBERSORT algorithm was used to assess CD8+ T cell proportions. Weighted gene co-expression network analysis was used to identify the co-expression modules with CD8+ T cell proportions and bladder tumor purity. Subsequently, we performed correlation analysis among angiogenesis factors, angiogenesis inhibitors, immune inflammatory responses, and CD8+ T cell related genes in tumor microenvironment. Results A CD8+ T cell related co-expression network was identified. Eight co-expressed genes (PSMB8, PSMB9, PSMB10, PSME2, TAP1, IRF1, FBOX6, ETV7) were identified as CD8+ T cell-related genes that promoted infiltration of CD8+ T cells, and were enriched in the MHC class I tumor antigen presentation process. The proteins level encoded by these genes (PSMB10, PSMB9, PSMB8, TAP1, IRF1, and FBXO6) were lower in the high clinical grade patients, which suggested the clinical phenotype correlation both in mRNA and protein levels. These factors negatively correlated with angiogenesis factors and positively correlated with angiogenesis inhibitors. PD-1 and PD-L1 positively correlated with these genes which suggested PD-1 expression level positively correlated with the biological process composed by these co-expression genes. In the high expression group of these genes, inflammation and immune response were more intense, and the tumor purity was lower, suggesting that these genes were immune protective factors that improved the prognosis in patients with bladder cancer. Conclusion These co-expressed genes promote high levels of infiltration of CD8+ T cells in an immunoproteasome process involved in MHC class I molecules. The mechanism might provide new pathways for treatment of patients who are insensitive to PD-1 immunotherapy due to low degrees of CD8+ T cell infiltration.
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Affiliation(s)
- Yutao Wang
- Department of Urology, China Medical University, The First Hospital of China Medical University, Shenyang, China
| | - Kexin Yan
- Department of Dermatology, China Medical University, The First Hospital of China Medical University, Shenyang, China
| | - Jiaxing Lin
- Department of Urology, China Medical University, The First Hospital of China Medical University, Shenyang, China
| | - Yang Liu
- Department of Urology, China Medical University, The First Hospital of China Medical University, Shenyang, China
| | - Jianfeng Wang
- Department of Urology, China Medical University, The First Hospital of China Medical University, Shenyang, China
| | - Xuejie Li
- Department of Urology, China Medical University, The First Hospital of China Medical University, Shenyang, China
| | - Xinxin Li
- Department of Urology, China Medical University, The First Hospital of China Medical University, Shenyang, China
| | - Zhixiong Hua
- Department of Urology, China Medical University, The First Hospital of China Medical University, Shenyang, China
| | - Zhenhua Zheng
- Department of Urology, China Medical University, The First Hospital of China Medical University, Shenyang, China
| | - Jianxiu Shi
- Department of Urology, China Medical University, The First Hospital of China Medical University, Shenyang, China
| | - Siqing Sun
- Department of Urology, China Medical University, The First Hospital of China Medical University, Shenyang, China
| | - Jianbin Bi
- Department of Urology, China Medical University, The First Hospital of China Medical University, Shenyang, China
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12
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Le-Trilling VTK, Trilling M. Ub to no good: How cytomegaloviruses exploit the ubiquitin proteasome system. Virus Res 2020; 281:197938. [PMID: 32198076 DOI: 10.1016/j.virusres.2020.197938] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 03/13/2020] [Accepted: 03/13/2020] [Indexed: 12/17/2022]
Abstract
Human cytomegalovirus (HCMV) is a ubiquitous member of the Betaherpesvirinae subfamily, causing life-threatening diseases in individuals with impaired, immature, or senescent immunity. Accordingly, HIV-infected AIDS patients, transplant recipients, and congenitally infected neonates frequently suffer from symptomatic episodes of HCMV replication. Like all viruses, HCMV has a split relationship with the host proteome. Efficient virus replication can only be achieved if proteins involved in intrinsic, innate, and adaptive immune responses are sufficiently antagonized. Simultaneously, the abundance and function of proteins involved in the synthesis of chemical building blocks required for virus production, such as nucleotides, amino acids, and fatty acids, must be preserved or even enriched. The ubiquitin (Ub) proteasome system (UPS) constitutes one of the most relevant protein decay systems of eukaryotic cells. In addition to the regulation of the turn-over and abundance of thousands of proteins, the UPS also generates the majority of peptides presented by major histocompatibility complex (MHC) molecules to allow surveillance by T lymphocytes. Cytomegaloviruses exploit the UPS to regulate the abundance of viral proteins and to manipulate the host proteome in favour of viral replication and immune evasion. After summarizing the current knowledge of CMV-mediated misuse of the UPS, we discuss the evolution of viral proteins utilizing the UPS for the degradation of defined target proteins. We propose two alternative routes of adapter protein development and their mechanistic consequences.
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Affiliation(s)
| | - Mirko Trilling
- Institute for Virology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
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Imai T, Suzue K, Ngo-Thanh H, Ono S, Orita W, Suzuki H, Shimokawa C, Olia A, Obi S, Taniguchi T, Ishida H, Van Kaer L, Murata S, Tanaka K, Hisaeda H. Fluctuations of Spleen Cytokine and Blood Lactate, Importance of Cellular Immunity in Host Defense Against Blood Stage Malaria Plasmodium yoelii. Front Immunol 2019; 10:2207. [PMID: 31608052 PMCID: PMC6773889 DOI: 10.3389/fimmu.2019.02207] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Accepted: 09/02/2019] [Indexed: 12/27/2022] Open
Abstract
Our previous studies of protective immunity and pathology against blood stage malaria parasites have shown that not only CD4+ T cells, but also CD8+ T cells and macrophages, are important for host defense against blood stage malaria infection. Furthermore, we found that Plasmodium yoelii 17XNL (PyNL) parasitizes erythroblasts, the red blood cell (RBC) precursor cells, which then express MHC class I molecules. In the present study, we analyzed spleen cytokine production. In CD8+ T cell-depleted mice, IL-10 production in early stage infection was increased over two-fold relative to infected control animals and IL-10+ CD3- cells were increased, whereas IFN-γ production in the late stage of infection was decreased. At day 16 after PyNL infection, CD8+ T cells produced more IFN-γ than CD4+ T cells. We evaluated the involvement of the immunoproteasome in induction of immune CD8+ T cells, and the role of Fas in protection against PyNL both of which are downstream of IFN-γ. In cell transfer experiments, at least the single molecules LMP7, LMP2, and PA28 are not essential for CD8+ T cell induction. The Fas mutant LPR mouse was weaker in resistance to PyNL infection than WT mice, and 20% of the animals died. LPR-derived parasitized erythroid cells exhibited less externalization of phosphatidylserine (PS), and phagocytosis by macrophages was impaired. Furthermore, we tried to identify the cause of death in malaria infection. Blood lactate concentration was increased in the CD8+ T cell-depleted PyNL-infected group at day 19 (around peak parasitemia) to similar levels as day 7 after infection with a lethal strain of Py. When we injected mice with lactate at day 4 and 6 of PyNL infection, all mice died at day 8 despite demonstrating low parasitemia, suggesting that hyperlactatemia is one of the causes of death in CD8+ T cell-depleted PyNL-infected mice. We conclude that CD8+ T cells might control cytokine production to some extent and regulate hyperparasitemia and hyperlactatemia in protection against blood stage malaria parasites.
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Affiliation(s)
- Takashi Imai
- Department of Infectious Diseases and Host Defense, Gunma University Graduate School of Medicine, Maebashi, Japan.,Department of Parasitology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Kazutomo Suzue
- Department of Infectious Diseases and Host Defense, Gunma University Graduate School of Medicine, Maebashi, Japan
| | - Ha Ngo-Thanh
- Department of Infectious Diseases and Host Defense, Gunma University Graduate School of Medicine, Maebashi, Japan
| | - Suguri Ono
- Department of Infectious Diseases and Host Defense, Gunma University Graduate School of Medicine, Maebashi, Japan
| | - Wakako Orita
- Department of Infectious Diseases and Host Defense, Gunma University Graduate School of Medicine, Maebashi, Japan
| | - Haruka Suzuki
- Department of Infectious Diseases and Host Defense, Gunma University Graduate School of Medicine, Maebashi, Japan
| | - Chikako Shimokawa
- Department of Infectious Diseases and Host Defense, Gunma University Graduate School of Medicine, Maebashi, Japan.,Department of Parasitology, National Institute of Infectious Diseases, Tokyo, Japan
| | - Alex Olia
- Department of Infectious Diseases and Host Defense, Gunma University Graduate School of Medicine, Maebashi, Japan.,Department of Parasitology, National Institute of Infectious Diseases, Tokyo, Japan
| | - Seiji Obi
- Department of Infectious Diseases and Host Defense, Gunma University Graduate School of Medicine, Maebashi, Japan
| | - Tomoyo Taniguchi
- Center for Medical Education, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - Hidekazu Ishida
- Department of Parasitology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Luc Van Kaer
- Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, TN, United States
| | - Shigeo Murata
- Laboratory of Protein Metabolism, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Keiji Tanaka
- Laboratory of Protein Metabolism, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | - Hajime Hisaeda
- Department of Parasitology, National Institute of Infectious Diseases, Tokyo, Japan
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14
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Kasahara M, Flajnik MF. Origin and evolution of the specialized forms of proteasomes involved in antigen presentation. Immunogenetics 2019; 71:251-261. [PMID: 30675634 DOI: 10.1007/s00251-019-01105-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 01/09/2019] [Indexed: 01/10/2023]
Abstract
Proteasomes are a multi-subunit protease complex that produces peptides bound by major histocompatibility complex (MHC) class I molecules. Phylogenetic studies indicate that two specialized forms of proteasomes, immunoproteasomes and thymoproteasomes, and the proteasome activator PA28αβ emerged in a common ancestor of jawed vertebrates which acquired adaptive immunity based on the MHC, T cell receptors, and B cell receptors ~ 500 million years ago. Comparative genomics studies now provide strong evidence that the genes coding for the immunoproteasome subunits emerged by genome-wide duplication. On the other hand, the gene encoding the thymoproteasome subunit β5t emerged by tandem duplication from the gene coding for the β5 subunit. Strikingly, birds lack immunoproteasomes, thymoproteasomes, and the proteasome activator PA28αβ, raising an interesting question of whether they have evolved any compensatory mechanisms.
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Affiliation(s)
- Masanori Kasahara
- Department of Pathology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, 060-8638, Japan.
| | - Martin F Flajnik
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD, 21201, USA.
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15
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González Y, Doens D, Cruz H, Santamaría R, Gutiérrez M, Llanes A, Fernández PL. A Marine Diterpenoid Modulates the Proteasome Activity in Murine Macrophages Stimulated with LPS. Biomolecules 2018; 8:E109. [PMID: 30301161 PMCID: PMC6315684 DOI: 10.3390/biom8040109] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 09/14/2018] [Accepted: 10/01/2018] [Indexed: 11/17/2022] Open
Abstract
The proteasome is an intracellular complex that degrades damaged or unfolded proteins and participates in the regulation of several processes. The immunoproteasome is a specialized form that is expressed in response to proinflammatory signals and is particularly abundant in immune cells. In a previous work, we found an anti-inflammatory effect in a diterpenoid extracted from the octocoral Pseudopterogorgia acerosa, here called compound 1. This compound prevented the degradation of inhibitor κB α (IκBα) and the subsequent activation of nuclear factor κB (NFκB), suggesting that this effect might be due to inhibition of the ubiquitin-proteasome system. Here we show that compound 1 inhibits the proteasomal chymotrypsin-like activity (CTL) of murine macrophages in the presence of lipopolysaccharide (LPS) but not in its absence. This effect might be due to the capacity of this compound to inhibit the activity of purified immunoproteasome. The compound inhibits the cell surface expression of major histocompatibility complex (MHC)-I molecules and the production of proinflammatory cytokines induced by LPS in vitro and in vivo, respectively. Molecular docking simulations predicted that compound 1 selectively binds to the catalytic site of immunoproteasome subunits β1i and β5i, which are responsible for the CTL activity. Taken together these findings suggest that the compound could be a selective inhibitor of the immunoproteasome, and hence could pave the way for its future evaluation as a candidate for the treatment of inflammatory disorders and autoimmune diseases.
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Affiliation(s)
- Yisett González
- Centro de Biología Celular y Molecular de Enfermedades, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP),Edificio 219, Ciudad del Saber, 0801 Panamá, Panamá.
| | - Deborah Doens
- Centro de Biología Celular y Molecular de Enfermedades, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP),Edificio 219, Ciudad del Saber, 0801 Panamá, Panamá.
| | - Héctor Cruz
- Centro de Biología Celular y Molecular de Enfermedades, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP),Edificio 219, Ciudad del Saber, 0801 Panamá, Panamá.
- Facultad de Ciencias de la Salud Dr. William C. Gorgas, Universidad Latina de Panamá, 0801 Panamá, Panamá.
| | - Ricardo Santamaría
- Centro de Biodiversidad y Descubrimiento de Drogas, INDICASAT AIP, Edificio 219, Ciudad del Saber, 0801 Panamá, Panamá.
| | - Marcelino Gutiérrez
- Centro de Biodiversidad y Descubrimiento de Drogas, INDICASAT AIP, Edificio 219, Ciudad del Saber, 0801 Panamá, Panamá.
| | - Alejandro Llanes
- Centro de Biología Celular y Molecular de Enfermedades, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP),Edificio 219, Ciudad del Saber, 0801 Panamá, Panamá.
| | - Patricia L Fernández
- Centro de Biología Celular y Molecular de Enfermedades, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP),Edificio 219, Ciudad del Saber, 0801 Panamá, Panamá.
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16
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Yasutomo K. Dysregulation of immunoproteasomes in autoinflammatory syndromes. Int Immunol 2018; 31:631-637. [DOI: 10.1093/intimm/dxy059] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Accepted: 08/30/2018] [Indexed: 12/30/2022] Open
Abstract
Abstract
Immunoproteasomes degrade ubiquitin-coupled proteins and play a role in creating peptides for presentation by MHC class I proteins. Studies of gene-deficient mice, in which each immunoproteasomal subunit was affected, have demonstrated that dysfunction of immunoproteasomes leads to immunodeficiency, i.e. reduced expression of MHC class I and attenuation of CD8 T-cell responses. Recent studies, however, have uncovered a new type of autoinflammatory syndrome characterized by fever, nodular erythema and progressive partial lipodystrophy that is caused by genetic mutations in immunoproteasome subunits. These mutations disturbed the assembly of immunoproteasomes, which led to reduced proteasomal activity and thus accumulation of ubiquitin-coupled proteins. Those findings suggest that immunoproteasomes function as anti-inflammatory machinery in humans. The discovery of a new type of autoinflammatory syndrome caused by dysregulated immunoproteasomes provides novel insights into the important roles of immunoproteasomes in inflammation as well as the spectrum of autoinflammatory diseases.
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Affiliation(s)
- Koji Yasutomo
- Department of Immunology & Parasitology, Graduate School of Medicine, Tokushima University, Kuramoto, Tokushima, Japan
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17
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The immunoproteasome and thymoproteasome: functions, evolution and human disease. Nat Immunol 2018; 19:923-931. [PMID: 30104634 DOI: 10.1038/s41590-018-0186-z] [Citation(s) in RCA: 198] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 07/12/2018] [Accepted: 07/19/2018] [Indexed: 01/12/2023]
Abstract
The basic principle of adaptive immunity is to strictly discriminate between self and non-self, and a central challenge to overcome is the enormous variety of pathogens that might be encountered. In cell-mediated immunity, immunological discernment takes place at a molecular or cellular level. Central to both mechanisms of discernment is the generation of antigenic peptides associated with MHC class I molecules, which is achieved by a proteolytic complex called the proteasome. To adequately accomplish the discrimination between self and non-self that is essential for adaptive immunity and self-tolerance, two proteasome subtypes have evolved via gene duplication: the immunoproteasome and the thymoproteasome. In this Review, we describe various aspects of these immunity-dedicated proteasomes, from their discovery to recent findings.
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18
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Keller CW, Schmidt J, Lünemann JD. Immune and myodegenerative pathomechanisms in inclusion body myositis. Ann Clin Transl Neurol 2017; 4:422-445. [PMID: 28589170 PMCID: PMC5454400 DOI: 10.1002/acn3.419] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 04/09/2017] [Accepted: 04/10/2017] [Indexed: 12/17/2022] Open
Abstract
Inclusion Body Myositis (IBM) is a relatively common acquired inflammatory myopathy in patients above 50 years of age. Pathological hallmarks of IBM are intramyofiber protein inclusions and endomysial inflammation, indicating that both myodegenerative and inflammatory mechanisms contribute to its pathogenesis. Impaired protein degradation by the autophagic machinery, which regulates innate and adaptive immune responses, in skeletal muscle fibers has recently been identified as a potential key pathomechanism in IBM. Immunotherapies, which are successfully used for treating other inflammatory myopathies lack efficacy in IBM and so far no effective treatment is available. Thus, a better understanding of the mechanistic pathways underlying progressive muscle weakness and atrophy in IBM is crucial in identifying novel promising targets for therapeutic intervention. Here, we discuss recent insights into the pathomechanistic network of mutually dependent inflammatory and degenerative events during IBM.
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Affiliation(s)
- Christian W. Keller
- Institute of Experimental ImmunologyLaboratory of NeuroinflammationUniversity of ZürichZürichSwitzerland
| | - Jens Schmidt
- Department of NeurologyUniversity Medical Center GöttingenGöttingenGermany
| | - Jan D. Lünemann
- Institute of Experimental ImmunologyLaboratory of NeuroinflammationUniversity of ZürichZürichSwitzerland
- Department of NeurologyUniversity Hospital ZürichZürichSwitzerland
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19
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Kovacsics CE, Gill AJ, Ambegaokar SS, Gelman BB, Kolson DL. Degradation of heme oxygenase-1 by the immunoproteasome in astrocytes: A potential interferon-γ-dependent mechanism contributing to HIV neuropathogenesis. Glia 2017; 65:1264-1277. [PMID: 28543773 DOI: 10.1002/glia.23160] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 03/28/2017] [Accepted: 04/07/2017] [Indexed: 12/16/2022]
Abstract
Induction of the detoxifying enzyme heme oxygenase-1 (HO-1) is a critical protective host response to cellular injury associated with inflammation and oxidative stress. We previously found that HO-1 protein expression is reduced in brains of HIV-infected individuals with HIV-associated neurocognitive disorders (HAND) and in HIV-infected macrophages, where this reduction associates with enhanced glutamate release and neurotoxicity. Because HIV-infected macrophages are a small component of the cellular content of the brain, the reduction of macrophage HO-1 expression likely accounts for a small portion of brain HO-1 loss in HIV infection. We therefore investigated the contribution of astrocytes, the major pool of brain HO-1. We identified immunoproteasome-mediated HO-1 degradation in astrocytes as a second possible mechanism of brain HO-1 loss in HIV infection. We demonstrate that prolonged exposure of human fetal astrocytes to interferon-gamma (IFNγ), an HIV-associated CNS immune activator, selectively reduces expression of HO-1 protein without a concomitant reduction in HO-1 RNA, increases expression of immunoproteasome subunits, and decreases expression of constitutive proteasome subunits, consistent with a shift towards increased immunoproteasome activity. In HIV-infected brain HO-1 protein reduction also associates with increased HO-1 RNA expression and increased immunoproteasome expression. Finally, we show that IFNγ treatment of astrocytic cells reduces HO-1 protein half-life in a proteasome-dependent manner. Our data thus suggest unique causal links among HIV infection, IFNγ-mediated immunoproteasome induction, and enhanced HO-1 degradation, which likely contribute to neurocognitive impairment in HAND. Such IFNγ-mediated HO-1 degradation should be further investigated for a role in neurodegeneration in inflammatory brain conditions. BRIEF SUMMARY Kovacsics et al. identify immunoproteasome degradation of heme oxygenase-1 (HO-1) in interferon gamma-stimulated astrocytes as a plausible mechanism for the observed loss of HO-1 protein expression in the brains of HIV-infected individuals, which likely contributes to the neurocognitive impairment in HIV-associated neurocognitive disorders.
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Affiliation(s)
- Colleen E Kovacsics
- Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, 19104
| | - Alexander J Gill
- Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, 19104
| | - Surendra S Ambegaokar
- Department of Botany & Microbiology, Robbins Program in Neuroscience, Ohio Wesleyan University, Delaware, Ohio, 43015
| | - Benjamin B Gelman
- Department of Pathology, University of Texas Medical Branch, Galveston, Texas, 77555
| | - Dennis L Kolson
- Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, 19104
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20
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Campana S, De Pasquale C, Carrega P, Ferlazzo G, Bonaccorsi I. Cross-dressing: an alternative mechanism for antigen presentation. Immunol Lett 2015; 168:349-54. [DOI: 10.1016/j.imlet.2015.11.002] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Revised: 11/02/2015] [Accepted: 11/03/2015] [Indexed: 12/16/2022]
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21
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Herrington FD, Carmody RJ, Goodyear CS. Modulation of NF-κB Signaling as a Therapeutic Target in Autoimmunity. ACTA ACUST UNITED AC 2015; 21:223-42. [PMID: 26597958 DOI: 10.1177/1087057115617456] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 10/26/2015] [Indexed: 01/04/2023]
Abstract
Autoimmune diseases arise from the loss of tolerance to endogenous self-antigens, resulting in a heterogeneous range of chronic conditions that cause considerable morbidity and mortality worldwide. In Western countries, over 5% of the population is affected by some form of autoimmune disease, with enhanced or inappropriate activation of nuclear factor (NF)-κB implicated in a number of these conditions. Although treatment strategies for autoimmunity have improved significantly in recent years, current therapeutics are still not capable of achieving satisfactory disease management in all patients, and as such, the therapeutic modulation of NF-κB is an attractive target in autoimmunity. To date, no NF-κB inhibitors have progressed to the clinic for the treatment of autoimmunity, but a variety of promising approaches targeting multiple stages of the NF-κB pathway are currently being explored. This review focuses on the current strategies being investigated for the inhibition of the NF-κB pathway in autoimmune diseases and considers potential future strategies for the therapeutic targeting of this crucial transcription factor.
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Affiliation(s)
- Felicity D Herrington
- University of Glasgow, Institute of Infection, Immunity and Inflammation, Glasgow, UK
| | - Ruaidhrí J Carmody
- University of Glasgow, Institute of Infection, Immunity and Inflammation, Glasgow, UK
| | - Carl S Goodyear
- University of Glasgow, Institute of Infection, Immunity and Inflammation, Glasgow, UK GLAZgo Discovery Centre, University of Glasgow, Institute of Infection, Immunity and Inflammation, Glasgow, UK
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22
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Paniagua Soriano G, De Bruin G, Overkleeft HS, Florea BI. Toward understanding induction of oxidative stress and apoptosis by proteasome inhibitors. Antioxid Redox Signal 2014; 21:2419-43. [PMID: 24437477 DOI: 10.1089/ars.2013.5794] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
SIGNIFICANCE Proteasome inhibitors (PIs) are used in the clinic for the treatment of hematopoietic malignancies. PI inhibitors induce endoplasmatic reticulum (ER) stress and oxidative stress, disruption of signaling pathways, mitochondrial dysfunction, and, eventually, cell death by apoptosis. PIs designated as clinical candidates include natural product derivatives and compounds developed by rational design and feature a wide diversity of structural elements. The vast amount of literature on this topic underscores PIs significance in driving basic research alongside therapeutic benefit. RECENT ADVANCES Research in recent years has brought an in-depth insight into the molecular mechanisms of PI-induced apoptosis. However, there are some paradoxes and controversies in the literature. In this review, the advances and uncertainties, in particular on the time course events that make cells commit to apoptosis, are discussed. In addition, some mechanisms of evolved PI resistance are presented, and speculations on the difference in sensitivity between cell or tumor types are brought forward. The review concludes by giving an outlook of recent methods that may be employed to describe the system biology of how PIs impact cell survival decisions. CRITICAL ISSUES The biology of ER stress, reactive oxygen species (ROS) production, and apoptosis as induced by PIs is not well understood. Absorbed by the strong focus on PIs, one might overlook the importance of proteasome activity activators or modulators and the study of enzymatic pathways that lie up- or downstream from the proteasome function. FUTURE DIRECTIONS An increased understanding of the systems biology at mRNA and protein levels and the kinetics behind the interaction between PIs and cells is imperative. The design and synthesis of subunit specific inhibitors for each of the seven known proteasome activities and for the enzymes associated to proteasomes will aid in unraveling biology of the ubiquitin-proteasome system in relation to ER stress, ROS production, and apoptosis and will generate leads for therapeutic intervention.
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Affiliation(s)
- Guillem Paniagua Soriano
- Gorlaeus Laboratories, Leiden Institute of Chemistry and Netherlands Proteomics Centre , Leiden, The Netherlands
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23
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Kasthuri SR, Umasuthan N, Whang I, Lim BS, Jung HB, Oh MJ, Jung SJ, Yeo SY, Kim SY, Lee J. Molecular characterization and expressional affirmation of the beta proteasome subunit cluster in rock bream immune defense. Mol Biol Rep 2014; 41:5413-27. [PMID: 24867079 DOI: 10.1007/s11033-014-3413-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 05/13/2014] [Indexed: 11/27/2022]
Abstract
Immunoproteasomes are primarily induced upon infection and formed by replacing constitutive beta subunits with inducible beta subunits which possess specific cleavage properties that aid in the release of peptides necessary for MHC class I antigen presentation. In this study, we report the molecular characterization and expression analysis of the inducible immunosubunits PSMB8, PSMB9, PSMB9-L, and PSMB10 from rock bream, Oplegnathus fasciatus. The three subunits shared common active site residues and were placed in close proximity to fish homologues in the reconstructed phylogenetic tree, in which the mammalian homologues formed separate clades, indicating a common ancestral origin. The rock bream immunosubunits possessed higher identity and similarity with the fish homologues. RbPSMB8, RbPSMB9, RbPSMB9-L, and RbPSMB10 were multi-exonic genes with 6, 6, 7 and 8 exons, respectively. These four genes were constitutively expressed in all the examined tissues. Immunostimulants such as lipopolysaccharide and poly I:C induced RbPSMB8, RbPSMB9, RbPSMB9-L, and RbPSMB10 in liver and head kidney, suggesting their possible involvement in immune defense in rock bream.
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Affiliation(s)
- Saranya Revathy Kasthuri
- Department of Marine Life Sciences, School of Marine Biomedical Sciences, Jeju National University, Jeju, 690-756, Jeju Self-Governing Province, Republic of Korea
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24
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Li X, Thompson D, Kumar B, DeMartino GN. Molecular and cellular roles of PI31 (PSMF1) protein in regulation of proteasome function. J Biol Chem 2014; 289:17392-405. [PMID: 24770418 DOI: 10.1074/jbc.m114.561183] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We investigated molecular features and cellular roles of PI31 (PSMF1) on regulation of proteasome function. PI31 has a C-terminal HbYX (where Hb is a hydrophobic amino acid, Y is tyrosine, and X is any amino acid) motif characteristic of several proteasome activators. Peptides corresponding to the PI31 C terminus also bind to and activate the 20 S proteasome in an HbYX-dependent manner, but intact PI31protein inhibits in vitro 20 S activity. Binding to and inhibition of the proteasome by PI31 are conferred by the HbYX-containing proline-rich C-terminal domain but do not require HbYX residues. Thus, multiple regions of PI31 bind independently to the proteasome and collectively determine effects on activity. PI31 blocks the ATP-dependent in vitro assembly of 26 S proteasome from 20 S proteasome and PA700 subcomplexes but has no effect on in vitro activity of the intact 26 S proteasome. To determine the physiologic significance of these in vitro effects, we assessed multiple aspects of cellular proteasome content and function after altering PI31 levels. We detected no change in overall cellular proteasome content or function when PI31 levels were either increased by moderate ectopic overexpression or decreased by RNA interference (RNAi). We also failed to identify a role of PI31 ADP-ribosylation as a mechanism for regulation of overall 26 S proteasome content and function, as recently proposed. Thus, despite its in vitro effects on various proteasome activities and its structural relationship to established proteasome regulators, cellular roles and mechanisms of PI31 in regulation of proteasome function remain unclear and require future definition.
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Affiliation(s)
- Xiaohua Li
- From the Department of Physiology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - David Thompson
- From the Department of Physiology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - Brajesh Kumar
- From the Department of Physiology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - George N DeMartino
- From the Department of Physiology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
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25
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Evolution of dimorphisms of the proteasome subunit beta type 8 gene (PSMB8) in basal ray-finned fish. Immunogenetics 2014; 66:325-34. [PMID: 24622793 DOI: 10.1007/s00251-014-0767-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Accepted: 02/26/2014] [Indexed: 10/25/2022]
Abstract
The proteasome subunit beta type 8 (PSMB8) gene encodes a catalytic subunit of immunoproteasome that plays a central role in the processing of antigenic peptides presented by major histocompatibility complex class I molecules. The A- and F-type alleles defined by the 31st amino acid residue determining cleaving specificity have been identified from ray-finned fish, amphibia, and reptiles. These two types show extremely long-term trans-species polymorphism in Polypteriformes, Cypriniformes, and Salmoniformes, suggesting the presence of very ancient lineages termed A and F. To elucidate the evolution of the PSMB8 dimorphism in basal ray-finned fish, we analyzed Pantodon buchholzi (Osteoglossiformes), seven species of Anguilliformes, and Hypomesus nipponensis (Osmeriformes). Both A and F lineage sequences were identified from P. buchholzi and H. nipponensis, confirming that these two lineages have been conserved by basal ray-finned fish. However, both the A- and F-type alleles found in Anguilliformes species belonged to the F lineage irrespective of their types. This apparently suggests that the A lineage was lost in the common ancestor of Anguilliformes, and recovery of the A type within the F lineage occurred in Anguilliformes. The apparent loss of the F lineage and recovery of the F type within the A lineage have already been reported from tetrapods and higher teleosts. However, this is the first report on the reverse situation and reveals the dynamic evolution of the PSMB8 dimorphism.
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26
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Villarino N, Schmidt NW. CD8 + T Cell Responses to Plasmodium and Intracellular Parasites. ACTA ACUST UNITED AC 2014; 9:169-178. [PMID: 24741372 PMCID: PMC3983867 DOI: 10.2174/1573395509666131126232327] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Revised: 11/14/2013] [Accepted: 11/19/2013] [Indexed: 12/29/2022]
Abstract
Parasitic protozoa are major threats to human health affecting millions of people around the world. Control of these infections by the host immune system relies on a myriad of immunological mechanisms that includes both humoral and cellular immunity. CD8+ T cells contribute to the control of these parasitic infections in both animals and humans. Here, we will focus on the CD8+ T cell response against a subset of these protozoa: Plasmodium, Toxoplasma gondii, Leishmania and Trypanosoma cruzi, with an emphasis on experimental rodent systems. It is evident a complex interaction occurs between CD8+ T cells and the invading protozoa. A detailed understanding of how CD8+ T cells mediate protection should provide the basis for the development of effective vaccines that prevent and control infections by these parasites.
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Affiliation(s)
- Nicolas Villarino
- Department of Microbiology, University of Tennessee, Knoxville, TN 37996, USA
| | - Nathan W Schmidt
- Department of Microbiology, University of Tennessee, Knoxville, TN 37996, USA
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27
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Abstract
The proteasome is a sophisticated, 2.5-MDa, multisubunit complex that contains a catalytic core particle (CP) and two terminal regulatory particles (RPs); the RPs associate with the termini of the central CP at opposite orientations. The CP consists of four axially stacked heptameric rings (two outer α-rings and two inner β-rings), which are made up of seven structurally related, but not identical, α and β subunits. The CP contains catalytic threonine residues (in β1, β2, and β5 with caspase-like, trypsin-like, and chymotrypsin-like activities, respectively) on the surface of the chamber formed by two abutting β-rings. The RP recognizes polyubiquitylated substrate proteins and unfolds and translocates these proteins to the interior of the CP for degradation. The RP comprises 19 different subunits, which are thought to form two subcomplexes called the lid and the base. One longstanding question is how the complex structure of the proteasome is organized with high fidelity. Recently, we proposed a novel assembly mechanism that is assisted by multiple proteasome-dedicated chaperones. In addition, we discovered two immuno-type proteasomes, the immunoproteasome and the thymoproteasome, whose catalytic subunits are replaced by homologous counterparts. These two isoforms perform specialized functions that help discriminate self from non-self in cell-mediated immunity (i.e., they function as enzymes that process intracellular antigens for cytotoxic T lymphocyte responses and thymic positive selection). Moreover, emerging evidence suggests that the proteasome is crucially involved in the pathophysiology of various intractable diseases that are increasing in today's aging society.
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Huang CH, Tanaka Y, Fujito NT, Nonaka M. Dimorphisms of the proteasome subunit beta type 8 gene (PSMB8) of ectothermic tetrapods originated in multiple independent evolutionary events. Immunogenetics 2013; 65:811-21. [PMID: 23982299 DOI: 10.1007/s00251-013-0729-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Accepted: 08/07/2013] [Indexed: 01/23/2023]
Abstract
The proteasome subunit beta type 8 gene (PSMB8) encodes one of the beta subunits of the immunoproteasome responsible for the generation of peptides presented by major histocompatibility complex class I molecules. Dimorphic alleles of the PSMB8 gene, termed A and F types, based on the deduced 31st amino acid residue of the mature protein have been reported from various vertebrates. Phylogenetic analysis revealed the presence of dichotomous ancient lineages, one comprising the F-type PSMB8 of basal ray-finned fishes, and the other comprising the A-type PSMB8 of these animals and both the F- and A-type PSMB8 of Xenopus and acanthopterygians, indicating that evolutionary history of the PSMB8 dimorphism was not straightforward. We analyzed the PSMB8 gene of five reptile and one amphibian species and found both the A and F types from all six. Phylogenetic analysis indicated that the PSMB8 F type was apparently regenerated from the PSMB8 A type at least five times independently during tetrapod evolution. Genomic typing of wild individuals of geckos and newts indicated that the frequencies of the A- and F-type alleles are not highly biased in these species. Phylogenetic analysis of each exon of the reptile PSMB8 gene suggested interallelic sequence homogenization as a possible evolutionary mechanism for the apparent recurrent regeneration of PSMB8 dimorphism in tetrapods. An extremely strong balancing selection acting on PSMB8 dimorphism was implicated in an unprecedented pattern of allele evolution.
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Affiliation(s)
- Ching-Huei Huang
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
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Duan X, Imai T, Chou B, Tu L, Himeno K, Suzue K, Hirai M, Taniguchi T, Okada H, Shimokawa C, Hisaeda H. Resistance to malaria by enhanced phagocytosis of erythrocytes in LMP7-deficient mice. PLoS One 2013; 8:e59633. [PMID: 23527234 PMCID: PMC3602297 DOI: 10.1371/journal.pone.0059633] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Accepted: 02/15/2013] [Indexed: 12/18/2022] Open
Abstract
General cellular functions of proteasomes occur through protein degradation, whereas the specific function of immunoproteasomes is the optimization of antigen processing associated with MHC class I. We and others previously reported that deficiency in subunits of immunoproteasomes impaired the activation of antigen-specific CD8+ T cells, resulting in higher susceptibility to tumor and infections. We demonstrated that CD8+ T cells contributed to protection against malaria parasites. In this study, we evaluated the role of immunoproteasomes in the course of infection with rodent malaria parasites. Unexpectedly, Plasmodium yoelii infection of mice deficient in LMP7, a catalytic subunit of immunoproteasomes, showed lower parasite growth in the early phase of infection and lower lethality compared with control mice. The protective characteristics of LMP7-deficient mice were not associated with enhanced immune responses, as the mutant mice showed comparable or diminished activation of innate and acquired immunity. The remarkable difference was observed in erythrocytes instead of immune responses. Parasitized red blood cells (pRBCs) purified from LMP7-deficient mice were more susceptible to phagocytosis by macrophages compared with those from wild-type mice. The susceptibility of pRBC to phagocytosis appeared to correlate with deformity of the membrane structures that were only observed after infection. Our results suggest that RBCs of LMP7-deficient mice were more likely to deform in response to infection with malaria parasites, presumably resulting in higher susceptibility to phagocytosis and in the partial resistance to malaria.
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Affiliation(s)
- Xuefeng Duan
- Department of Parasitology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Takashi Imai
- Department of Parasitology, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - Bin Chou
- Department of Parasitology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Liping Tu
- Department of Parasitology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Kunisuke Himeno
- Department of Parasitology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Kazutomo Suzue
- Department of Parasitology, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - Makoto Hirai
- Department of Parasitology, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - Tomoyo Taniguchi
- Department of Parasitology, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - Hiroko Okada
- Department of Parasitology, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - Chikako Shimokawa
- Department of Parasitology, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - Hajime Hisaeda
- Department of Parasitology, Graduate School of Medicine, Gunma University, Maebashi, Japan
- * E-mail:
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30
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Hodas JJL, Nehring A, Höche N, Sweredoski MJ, Pielot R, Hess S, Tirrell DA, Dieterich DC, Schuman EM. Dopaminergic modulation of the hippocampal neuropil proteome identified by bioorthogonal noncanonical amino acid tagging (BONCAT). Proteomics 2012; 12:2464-76. [PMID: 22744909 DOI: 10.1002/pmic.201200112] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Local protein synthesis and its activity-dependent modulation via dopamine receptor stimulation play an important role in synaptic plasticity - allowing synapses to respond dynamically to changes in their activity patterns. We describe here the metabolic labeling, enrichment, and MS-based identification of candidate proteins specifically translated in intact hippocampal neuropil sections upon treatment with the selective D1/D5 receptor agonist SKF81297. Using the noncanonical amino acid azidohomoalanine and click chemistry, we identified over 300 newly synthesized proteins specific to dendrites and axons. Candidates specific for the SKF81297-treated samples were predominantly involved in protein synthesis and synapse-specific functions. Furthermore, we demonstrate a dendrite-specific increase in proteins synthesis upon application of SKF81297. This study provides the first snapshot in the dynamics of the dopaminergic hippocampal neuropil proteome.
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Affiliation(s)
- Jennifer J L Hodas
- Division of Biology, California Institute of Technology, Pasadena, CA, USA
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31
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Ebstein F, Kloetzel PM, Krüger E, Seifert U. Emerging roles of immunoproteasomes beyond MHC class I antigen processing. Cell Mol Life Sci 2012; 69:2543-58. [PMID: 22382925 PMCID: PMC11114860 DOI: 10.1007/s00018-012-0938-0] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2011] [Revised: 01/18/2012] [Accepted: 02/06/2012] [Indexed: 01/09/2023]
Abstract
The proteasome is a multi-catalytic protein complex whose primary function is the degradation of abnormal or foreign proteins. Upon exposure of cells to interferons (IFNs), the β1i/LMP2, β2i/MECL-1, and β5i/LMP7 subunits are induced and incorporated into newly synthesized immunoproteasomes (IP), which are thought to function solely as critical players in the optimization of the CD8(+) T-cell response. However, the observation that IP are present in several non-immune tissues under normal conditions and/or following pathological events militates against the view that its role is limited to MHC class I presentation. In support of this concept, the recent use of genetic models deficient for β1i/LMP2, β2i/MECL-1, or β5i/LMP7 has uncovered unanticipated functions for IP in innate immunity and non-immune processes. Herein, we review recent data in an attempt to clarify the role of IP beyond MHC class I epitope presentation with emphasis on its involvement in the regulation of protein homeostasis, cell proliferation, and cytokine gene expression.
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Affiliation(s)
- Frédéric Ebstein
- Institut für Biochemie, Charité-Universitätsmedizin Berlin Campus CVK, Oudenarderstr.16, 13347 Berlin, Germany
| | - Peter-Michael Kloetzel
- Institut für Biochemie, Charité-Universitätsmedizin Berlin Campus CVK, Oudenarderstr.16, 13347 Berlin, Germany
| | - Elke Krüger
- Institut für Biochemie, Charité-Universitätsmedizin Berlin Campus CVK, Oudenarderstr.16, 13347 Berlin, Germany
| | - Ulrike Seifert
- Institut für Biochemie, Charité-Universitätsmedizin Berlin Campus CVK, Oudenarderstr.16, 13347 Berlin, Germany
- Institut für Molekulare und Klinische Immunologie, Medizinische Fakultät, Otto-von-Guericke-Universität Magdeburg, Leipziger Str. 44, 39120 Magdeburg, Germany
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32
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Fujito NT, Nonaka M. Highly divergent dimorphic alleles of the proteasome subunit beta type-8 (PSMB8) gene of the bichir Polypterus senegalus: implication for evolution of the PSMB8 gene of jawed vertebrates. Immunogenetics 2012; 64:447-53. [PMID: 22322674 DOI: 10.1007/s00251-012-0602-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Accepted: 01/20/2012] [Indexed: 11/30/2022]
Abstract
The proteasome subunit beta type-8 (PSMB8) gene encodes a catalytic subunit of the immunoproteasome, which is involved in the generation of peptides presented by MHC class I molecules. To date, highly diverged dichotomous alleles of PSMB8 have been reported in Oryzias species (actinopterygian teleosts) and Xenopus species (sarcopterygian amphibians). These dimorphic alleles share a similar substitution (A/V(31)F/Y) at the 31st position of the mature protein, which is most probably involved in formation of the S1 pocket. This substitution likely confers different cleavage specificities on the dimorphic PSMB8s. In addition, two paralogous PSMB8 genes possessing the A and F residues at the 31st position have been reported in sharks. Phylogenetic analysis indicated that the two types of PSMB8 of Oryzias, Xenopus, and sharks arose by independent evolutionary events. Here, we identified another pair of dimorphic alleles of PSMB8, which have the A and F residues at the 31st position of the mature protein, from bichir, Polypterus senegalus, a basal actinopterygian. The sequences of the mature proteins-encoding region of the dimorphic alleles of bichir PSMB8, the A and F types, showed only 72.7% and 77.5% identities at the nucleotide and the deduced amino acid levels, respectively. Their intronic sequences show almost no similarity, indicating that the dimorphic alleles of bichir PSMB8 have a very ancient origin. However, phylogenetic analysis showed that the dimorphisms of PSMB8 of bichir, Xenopus, and Oryzias arose by independent evolutionary events, suggesting the presence of a strong selective pressure for possessing the dimorphism.
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Affiliation(s)
- Naoko T Fujito
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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33
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Eleftheriadis T. The existence of two types of proteasome, the constitutive proteasome and the immunoproteasome, may serve as another layer of protection against autoimmunity. Med Hypotheses 2011; 78:138-41. [PMID: 22070888 DOI: 10.1016/j.mehy.2011.10.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Accepted: 10/10/2011] [Indexed: 12/28/2022]
Abstract
Negative selection of CD8 single positive thymocytes is based on the presentation through the major histocompatibility complex (MHC) class I pathway of peptides derived from degradation of self-proteins by the constitutive proteasome and the immunoproteasome in the thymus. Then naïve CD8+ T-cells can be primed by mature dendritic cells. In mature dendritic cells peptides presented by MHC class I molecules are derived from degradation of endogenous self-proteins or through the process of cross-presentation from degradation of exogenous proteins by the immunoproteasome. In the absence of infection, peripheral cells display peptides on MHC class I molecules derived from degradation of endogenous self-proteins by the constitutive proteasome. The pool of peptides derived from protein degradation by the constitutive proteasome differs from the pool peptides derived from protein degradation by the immunoproteasome. Thus the probability of an autoreactive naïve CD8+ T-cell that escaped negative selection, and converted by a mature dendritic cell to autoreactive cytolytic T-cell, to kill a normal cell in the periphery, is reduced.
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34
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Wu X, Wang Y, Sun Y. Molecular characterization, expression analysis and association study with immune traits of porcine PSMB6 gene. Mol Biol Rep 2011; 38:5465-70. [DOI: 10.1007/s11033-011-0866-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Accepted: 05/12/2011] [Indexed: 11/24/2022]
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35
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Transspecies dimorphic allelic lineages of the proteasome subunit beta-type 8 gene (PSMB8) in the teleost genus Oryzias. Proc Natl Acad Sci U S A 2010; 107:21599-604. [PMID: 21098669 DOI: 10.1073/pnas.1012881107] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The proteasome subunit β-type 8 (PSMB8) gene in the jawed vertebrate MHC genomic region encodes a catalytic subunit of the immunoproteasome involved in the generation of peptides to be presented by the MHC class I molecules. A teleost, the medaka (Oryzias latipes), has highly diverged dimorphic allelic lineages of the PSMB8 gene with only about 80% amino acid identity, termed "PSMB8d" and "PSMB8N," which have been retained by most wild populations analyzed. To elucidate the evolutionary origin of these two allelic lineages, seven species of the genus Oryzias were analyzed for their PSMB8 allelic sequences using a large number of individuals from wild populations. All the PSMB8 alleles of these species were classified into one of these two allelic lineages based on their nucleotide sequences of exons and introns, indicating that the Oryzias PSMB8 gene has a truly dichotomous allelic lineage. Retention of both allelic lineages was confirmed except for one species. The PSMB8d lineage showed a higher frequency than the PSMB8N lineage in all seven species. The two allelic lineages showed curious substitutions at the 31st and 53rd residues of the mature peptide, probably involved in formation of the S1 pocket, suggesting that these allelic lineages show a functional difference in cleavage specificity. These results indicate that the PSMB8 dimorphism was established before speciation within the genus Oryzias and has been maintained for more than 30-60 million years under a strict and asymmetric balancing selection through several speciation events.
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36
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Tu L, Moriya C, Imai T, Ishida H, Tetsutani K, Duan X, Murata S, Tanaka K, Shimokawa C, Hisaeda H, Himeno K. Critical role for the immunoproteasome subunit LMP7 in the resistance of mice to Toxoplasma gondii
infection. Eur J Immunol 2010. [DOI: 10.1002/eji.200939117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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37
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Hussong SA, Kapphahn RJ, Phillips SL, Maldonado M, Ferrington DA. Immunoproteasome deficiency alters retinal proteasome's response to stress. J Neurochem 2010; 113:1481-90. [PMID: 20345760 DOI: 10.1111/j.1471-4159.2010.06688.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Our previous work demonstrated that immunoproteasome is up-regulated in the retina and brain in response to injury that does not involve an inflammatory response (J. Neurochem. 2008; 106:158). These results suggest additional non-immune functions for the immunoproteasome in the cellular stress response pathway. The present study further investigates the potential involvement of the immunoproteasome in responding to the chronic stress of aging or oxidant exposure in the retina and cultured retinal pigment epithelial (RPE) cells from knock-out mice missing either one (lmp7(-/-)) or two (lmp7(-/-)/mecl-1(-/-)) immunoproteasome subunits. We show that aging and chronic oxidative stress up-regulates immunoproteasome in the retina and RPE from wild-type mice. No up-regulation of LMP2 was observed in retinas or RPE lacking MECL-1 and/or LMP7, suggesting that the full complement of immunoproteasome subunits is required to achieve maximal up-regulation in response to stress. We also show that RPE deficient in immunoproteasome are more susceptible to oxidation-induced cell death, supporting a role for immunoproteasome in protecting from oxidative stress. These results provide key mechanistic insight into novel aspects of proteasome biology and are an important first step in identifying alternative roles for retinal immunoproteasome that are unrelated to its role in the immune response.
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Affiliation(s)
- Stacy A Hussong
- Department of Ophthalmology, University of Minnesota, Minneapolis, MN, USA
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38
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Tu L, Moriya C, Imai T, Ishida H, Tetsutani K, Duan X, Murata S, Tanaka K, Shimokawa C, Hisaeda H, Himeno K. Critical role for the immunoproteasome subunit LMP7 in the resistance of mice to Toxoplasma gondii infection. Eur J Immunol 2010; 39:3385-94. [PMID: 19830724 DOI: 10.1002/eji.200839117] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Proteasome-mediated proteolysis is responsible for the generation of immunogenic epitopes presented by MHC class I molecules, which activate antigen-specific CD8+ T cells. Immunoproteasomes, defined by the presence of the three catalytic subunits LMP2, MECL-1, and LMP7, have been hypothesized to optimize MHC class I antigen processing. In this study, we demonstrate that the infection of mice with a protozoan parasite, Toxoplasma gondii, induced the expression of LMP7 mRNA in APC and increased the capacity of APC to induce the production of IFN-gamma by antigen-specific CD8+ T cells. In vitro infection of a DC cell line with T. gondii also induced the expression of LMP7 and resulted in enhanced proteasome proteolytic activity. Finally, mice lacking LMP7 were highly susceptible to infection with T. gondii and showed a reduced number of functional CD8+ T cells. These results demonstrate that proteasomes containing LMP7 play an indispensable role in the survival of mice infected with T. gondii, presumably due to the efficient generation of CTL epitopes required for the functional development of CD8+ T cells.
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Affiliation(s)
- Liping Tu
- Department of Parasitology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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39
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Groettrup M, Kirk CJ, Basler M. Proteasomes in immune cells: more than peptide producers? Nat Rev Immunol 2009; 10:73-8. [PMID: 20010787 DOI: 10.1038/nri2687] [Citation(s) in RCA: 256] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
When cells are stimulated with pro-inflammatory cytokines, most of their constitutively expressed proteasomes are replaced with immunoproteasomes, which increase the production of peptides for presentation on MHC class I molecules. In addition, cortical thymic epithelial cells selectively express a type of proteasome known as the thymoproteasome that is required for the positive selection of thymocytes. Here, we discuss how these specialized types of proteasome shape the T cell receptor repertoire of cytotoxic T lymphocytes and propose that immunoproteasomes have functions, in addition to antigen processing, that influence cytokine production and T cell differentiation, survival and function. We also discuss how inhibitors of immunoproteasomes can suppress undesired T cell responses in autoimmune diseases.
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Affiliation(s)
- Marcus Groettrup
- Division of Immunology, Department of Biology, University of Constance, Konstanz, Germany.
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40
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Jung T, Grune T. The proteasome and its role in the degradation of oxidized proteins. IUBMB Life 2009; 60:743-52. [PMID: 18636510 DOI: 10.1002/iub.114] [Citation(s) in RCA: 118] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The generation of free radicals and the resulting oxidative modification of cell structures are omnipresent in mammalian cells. This includes the permanent oxidation of proteins leading to the disruption of the protein structure and an impaired functionality. In consequence, these oxidized proteins have to be removed in order to prevent serious metabolic disturbances. The most important cellular proteolytic system responsible for the removal of oxidized proteins is the proteasomal system. For normal functioning, the proteasomal system needs the coordinated interaction of numerous components. This review describes the fundamental functions of the 20S "core" proteasome, its regulators, and the roles of the proteasomal system beyond the removal of oxidized proteins in mammalian cells.
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Affiliation(s)
- Tobias Jung
- Institute for Biological Chemistry and Nutrition, Biofunctionality and Food Safety (140f), University of Hohenheim, Stuttgart, Germany
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41
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Sen A, Lv L, Bello N, Ireland JJ, Smith GW. Cocaine- and amphetamine-regulated transcript accelerates termination of follicle-stimulating hormone-induced extracellularly regulated kinase 1/2 and Akt activation by regulating the expression and degradation of specific mitogen-activated protein kinase phosphatases in bovine granulosa cells. Mol Endocrinol 2008; 22:2655-76. [PMID: 18818282 DOI: 10.1210/me.2008-0077] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Pleiotropic actions of cocaine- and amphetamine-regulated transcript (CART) are well described in the central nervous system and periphery, but the intracellular mechanisms mediating biological actions of CART are poorly understood. Although CART is not expressed in mouse ovaries, we have previously established CART as a novel intracellular regulator of estradiol production in bovine granulosa cells. We demonstrated that inhibitory actions of CART on estradiol production are mediated through inhibition of FSH-induced cAMP accumulation, Ca(2+) influx, and aromatase mRNA expression via a G(o/i)-dependent pathway. We also reported that FSH-induced estradiol production is dependent on Erk1/2 and Akt signaling, and CART may regulate other signaling proteins downstream of cAMP essential for estradiol production. Here, we demonstrate that CART is a potent inhibitor of FSH-stimulated Erk1/2 and Akt signaling and the mechanisms involved. Transient CART stimulation of bovine granulosa cells shortens the duration of FSH-induced Erk1/2 and Akt signaling whereas a prolonged (24 h) CART treatment blocks Erk1/2 and Akt activation in response to FSH. This CART-induced accelerated termination of Erk1/2 and Akt signaling is mediated both by induced expression and impaired ubiquitin-mediated proteasome degradation of dual specific phosphatase 5 (DUSP5) and protein phosphatase 2A. Results also support existence of a negative feedback loop in which CART via a G(o/i)-MAPK kinase dependent pathway activates Erk1/2, and the latter induces DUSP5 expression. Moreover, small interfering RNA mediated ablation of DUSP5 and/or protein phosphatase 2A prevents the CART-induced early termination of Erk1/2 and Akt signaling. Results provide novel insight into the intracellular mechanism of action of CART in regulation of FSH-induced MAPK signaling.
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Affiliation(s)
- Aritro Sen
- Laboratory of Mammalian Reproductive Biology and Genomics, Michigan State University, East Lansing, Michigan 48824, USA
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42
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Ferrington DA, Hussong SA, Roehrich H, Kapphahn RJ, Kavanaugh SM, Heuss ND, Gregerson DS. Immunoproteasome responds to injury in the retina and brain. J Neurochem 2008; 106:158-69. [PMID: 18346202 PMCID: PMC4401486 DOI: 10.1111/j.1471-4159.2008.05345.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
It is well known that immunoproteasome generates peptides for MHC Class I occupancy and recognition by cytotoxic T lymphocytes (CTL). The present study focused on evidence for alternative roles for immunoproteasome. Retina and brain were analyzed for expression of immunoproteasome subunits using immunohistochemistry and western blotting under normal conditions and after injury/stress induced by CTL attack on glia (brain) or neurons (retina). Normal retina expressed substantial levels of immunoproteasome in glia, neurons, and retinal pigment epithelium. The basal level of immunoproteasome in retina was two-fold higher than in brain; CTL-induced retinal injury further up-regulated immunoproteasome expression. Immunoproteasome up-regulation was also observed in injured brain and corresponded with expression in Purkinje cells, microglia, astrocytes, and oligodendrocytes. These results suggest that the normal environment of the retina is sufficiently challenging to require on-going expression of immunoproteasome. Further, immunoproteasome up-regulation with retinal and brain injury implies a role in neuronal protection and/or repair of damage.
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Affiliation(s)
- Deborah A Ferrington
- Department of Ophthalmology, University of Minnesota, Minneapolis, Minnesota, USA.
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43
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Enhanced expression of interferon-gamma-induced antigen-processing machinery components in a spontaneously occurring cancer. Neoplasia 2007; 9:960-9. [PMID: 18030364 DOI: 10.1593/neo.07649] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2007] [Revised: 08/28/2007] [Accepted: 08/31/2007] [Indexed: 11/18/2022] Open
Abstract
In human tumors, changes in the surface expression and/or function of major histocompatibility complex (MHC) class I antigens are frequently found and may provide malignant cells with a mechanism to escape control of the immune system. This altered human lymphocyte antigen (HLA) class I phenotype can be caused by either structural alterations or dysregulation of genes encoding subunits of HLA class I antigens and/or components of the MHC class I antigen-processing machinery (APM). Herein we analyze the expression of several proteins involved in the generation of MHC class I epitopes in feline injection site sarcoma, a spontaneously occurring tumor in cats that is an informative model for the study of tumor biology in other species, including humans. Eighteen surgically removed primary fibrosarcoma lesions were analyzed, and an enhanced expression of two catalytic subunits of immunoproteasomes, PA28 and leucine aminopeptidase, was found in tumors compared to matched normal tissues. As a functional counterpart of these changes in protein levels, proteasomal activities were increased in tissue extracts from fibrosarcomas. Taken together, these results suggest that alterations in the APM system may account for reduced processing of selected tumor antigens and may potentially provide neoplastic fibroblasts with a mechanism for escape from T-cell recognition and destruction.
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Abstract
The ubiquitin proteasome system (UPS) represents a major pathway for intracellular protein degradation. Proteasome dependent protein quality control participates in cell cycle, immune response and apoptosis. Therefore, the UPS is in focus of therapeutic investigations and the development of pharmaceutical agents. Detailed analyses on proteasome structure and function are the foundation for drug development and clinical studies. Proteomic approaches contributed significantly to our current knowledge in proteasome research. In particular, 2-DE has been essential in facilitating the development of current models on molecular composition and assembly of proteasome complexes. Furthermore, developments in MS enabled identification of UPS proteins and their PTMs at high accuracy and high-throughput. First results on global characterization of the UPS are also available. Although the UPS has been intensively investigated within the last two decades, its functional significance and contribution to the regulation of cell and tissue phenotypes remain to be explored. This review recapitulates a variety of applied proteomic approaches in proteasome exploration, and presents an overview of current technologies and their potential in driving further investigations.
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Affiliation(s)
- Oliver Drews
- Department of Physiology, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
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45
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Ignatenko NA, Yerushalmi HF, Watts GS, Futscher BW, Stringer DE, Marton LJ, Gerner EW. Pharmacogenomics of the polyamine analog 3,8,13,18-tetraaza-10,11-[(E)-1,2-cyclopropyl]eicosane tetrahydrochloride, CGC-11093, in the colon adenocarcinoma cell line HCT1161. Technol Cancer Res Treat 2007; 5:553-64. [PMID: 17121431 DOI: 10.1177/153303460600500602] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Polyamine analogs are known to inhibit tumorigenesis at least in part by mimicking some of the regulatory roles of natural polyamines. To begin the identification of those signaling pathways that are involved in differential cellular responses to the synthetic conformationally restricted polyamine analog CGC-11093, we conducted gene expression profiling, proteomic, and genome-wide DNA methylation and histone acetylation analyses of the HCT116 colon adenocarcinoma cell line after treatment with this analog. Gene expression analysis was performed using Affymetrix GeneChip human genome U133 Plus 2.0 arrays. Changes in protein expression were evaluated using 2D polyacrylamide gels followed by LCMS/MS. DNA methylation was measured using 6,800 element CpG island microarrays. Treatment of cells with CGC-11093 at concentrations ranging from 0.1 to 10 microM caused inhibition of cell growth and metabolic activity, but only minimally affected cell viability. Gene expression analysis showed concentration-dependent effects of CGC-11093 on the DNA/RNA binding transcription factor, cell cycle, signaling, transport, cytoskeletal/structural, and serine protease genes. Functional gene analysis revealed distinct expression patterns related to inhibition of cell cycle control, TGF beta signaling, proteasome and RNA polymerase pathways, upregulation of the aminoacyl-tRNA synthesis pathway, and perturbations in the MAPK and Wnt signaling pathways. Microarray results were validated for selected genes with real time RT PCR. Proteomics analysis showed correlative changes in the expression of proteins involved in the regulation of proteasome function (proteasome subunit Y) and tRNA synthesis. CGC-11093 treatment did not produce any detectable changes in DNA methylation or histone acetylation in cells. This study validates specific target pathways for a specific conformationally restricted polyamine analog and suggests the utility of combined gene and DNA methylation microarrays along with proteomic analyses as a useful approach to the evaluation of the mechanisms of action of anticancer drugs.
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Affiliation(s)
- Natalia A Ignatenko
- Department of Cell Biology and Anatomy, Arizona Cancer Center, The University of Arizona, 1515 N. Campbell Avenue, Tucson, Arizona 85724, USA.
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46
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Callahan MK, Wohlfert EA, Ménoret A, Srivastava PK. Heat Shock Up-Regulates lmp2 and lmp7 and Enhances Presentation of Immunoproteasome-Dependent Epitopes. THE JOURNAL OF IMMUNOLOGY 2006; 177:8393-9. [PMID: 17142736 DOI: 10.4049/jimmunol.177.12.8393] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The heat shock response is a canonical regulatory pathway by which cellular stressors such as heat and oxidative stress alter the expression of stress-responsive genes. Some of these stress-responsive genes (heat shock proteins and MHC class I (MHC I)-related chains) play a significant role in the immune system. In this study, we have investigated the impact of stimulating the heat shock response on genes involved in the MHC I presentation pathway. We report that two inducible subunits of the proteasome, lmp2 and lmp7, are transcriptionally up-regulated by heat shock in cells of mouse and human origin. Furthermore, heat-shocked cells show enhanced presentation of the immunoproteasome-dependent MHC I antigenic epitopes NP(118-126) of lymphocytic choriomeningitis virus and E1B(192-200) of adenovirus, but not immunoproteasome-independent epitopes such as tumor Ag AH1 and SV40 large T Ag epitope II(223-231). These findings show a novel immunological sequel to the cellular response to stress that may play a key role during fever or other homeostatic perturbations.
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Affiliation(s)
- Margaret K Callahan
- Center for Immunotherapy of Cancer and Infectious Diseases, University of Connecticut School of Medicine, Farmington, CT 06030, USA.
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47
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Khan IA, Thomas SY, Moretto MM, Lee FS, Islam SA, Combe C, Schwartzman JD, Luster AD. CCR5 is essential for NK cell trafficking and host survival following Toxoplasma gondii infection. PLoS Pathog 2006; 2:e49. [PMID: 16789839 PMCID: PMC1475660 DOI: 10.1371/journal.ppat.0020049] [Citation(s) in RCA: 132] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2005] [Accepted: 04/12/2006] [Indexed: 11/18/2022] Open
Abstract
The host response to intracellular pathogens requires the coordinated action of both the innate and acquired immune systems. Chemokines play a critical role in the trafficking of immune cells and transitioning an innate immune response into an acquired response. We analyzed the host response of mice deficient in the chemokine receptor CCR5 following infection with the intracellular protozoan parasite Toxoplasma gondii. We found that CCR5 controls recruitment of natural killer (NK) cells into infected tissues. Without this influx of NK cells, tissues from CCR5-deficient (CCR5-/-) mice were less able to generate an inflammatory response, had decreased chemokine and interferon gamma production, and had higher parasite burden. As a result, CCR5-/- mice were more susceptible to infection with T. gondii but were less susceptible to the immune-mediated tissue injury seen in certain inbred strains. Adoptive transfer of CCR5+/+ NK cells into CCR5-/- mice restored their ability to survive lethal T. gondii infection and demonstrated that CCR5 is required for NK cell homing into infected liver and spleen. This study establishes CCR5 as a critical receptor guiding NK cell trafficking in host defense.
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Affiliation(s)
- Imtiaz A Khan
- Department of Microbiology, Immunology, and Parasitology, Louisiana State University Medical Center, New Orleans, Louisiana, United States of America
- * To whom correspondence should be addressed. E-mail: (IAK); (ADL)
| | - Seddon Y Thomas
- Center for Immunology and Inflammatory Diseases, Division of Rheumatology, Allergy, and Immunology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Magali M Moretto
- Department of Microbiology, Immunology, and Parasitology, Louisiana State University Medical Center, New Orleans, Louisiana, United States of America
| | - Frederick S Lee
- Center for Immunology and Inflammatory Diseases, Division of Rheumatology, Allergy, and Immunology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Sabina A Islam
- Center for Immunology and Inflammatory Diseases, Division of Rheumatology, Allergy, and Immunology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Crescent Combe
- Department of Microbiology, Immunology, and Parasitology, Louisiana State University Medical Center, New Orleans, Louisiana, United States of America
| | - Joseph D Schwartzman
- Department of Pathology, Dartmouth Medical School, Lebanon, New Hampshire, United States of America
| | - Andrew D Luster
- Center for Immunology and Inflammatory Diseases, Division of Rheumatology, Allergy, and Immunology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
- * To whom correspondence should be addressed. E-mail: (IAK); (ADL)
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48
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Ivakine EA, Gulban OM, Mortin-Toth SM, Wankiewicz E, Scott C, Spurrell D, Canty A, Danska JS. Molecular Genetic Analysis of the Idd4 Locus Implicates the IFN Response in Type 1 Diabetes Susceptibility in Nonobese Diabetic Mice. THE JOURNAL OF IMMUNOLOGY 2006; 176:2976-90. [PMID: 16493056 DOI: 10.4049/jimmunol.176.5.2976] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
High-resolution mapping and identification of the genes responsible for type 1 diabetes (T1D) has proved difficult because of the multigenic etiology and low penetrance of the disease phenotype in linkage studies. Mouse congenic strains have been useful in refining Idd susceptibility loci in the NOD mouse model and providing a framework for identification of genes underlying complex autoimmune syndromes. Previously, we used NOD and a nonobese diabetes-resistant strain to map the susceptibility to T1D to the Idd4 locus on chromosome 11. Here, we report high-resolution mapping of this locus to 1.4 megabases. The NOD Idd4 locus was fully sequenced, permitting a detailed comparison with C57BL/6 and DBA/2J strains, the progenitors of T1D resistance alleles found in the nonobese diabetes-resistant strain. Gene expression arrays and quantitative real-time PCR were used to prioritize Idd4 candidate genes by comparing macrophages/dendritic cells from congenic strains where allelic variation was confined to the Idd4 interval. The differentially expressed genes either were mapped to Idd4 or were components of the IFN response pathway regulated in trans by Idd4. Reflecting central roles of Idd4 genes in Ag presentation, arachidonic acid metabolism and inflammation, phagocytosis, and lymphocyte trafficking, our combined analyses identified Alox15, Alox12e, Psmb6, Pld2, and Cxcl16 as excellent candidate genes for the effects of the Idd4 locus.
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Affiliation(s)
- Evgueni A Ivakine
- Program in Developmental Biology, Hospital for Sick Children, Toronto, Ontario, Canada
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Bandoh N, Ogino T, Cho HS, Hur SY, Shen J, Wang X, Kato S, Miyokawa N, Harabuchi Y, Ferrone S. Development and characterization of human constitutive proteasome and immunoproteasome subunit-specific monoclonal antibodies. ACTA ACUST UNITED AC 2005; 66:185-94. [PMID: 16101829 DOI: 10.1111/j.1399-0039.2005.00462.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Delta (Y), MB1 (X), and Z are the three catalytic beta-subunits located in the inner rings of the constitutive proteasome, an intracellular multicatalytic complex responsible for the generation of peptides presented by human leukocyte antigen (HLA) class I antigens to T cells. When cells are incubated with interferon-gamma, delta (Y), MB1 (X), and Z are replaced by LMP2, LMP7, and LMP10, respectively, leading to the expression of immunoproteasome which generates peptides with increased affinity for HLA class I antigens. The characterization of the expression of constitutive proteasome and immunoproteasome subunits in cells, normal tissues, and malignant lesions has been hampered by the lack or limited availability of constitutive proteasome and immunoproteasome subunit-specific monoclonal antibodies (mAbs), which are suitable for immunohistochemical staining. To overcome this limitation, we generated human delta (Y), MB1 (X), Z, LMP2, LMP7, and LMP10-specific mAb-secreting hybridomas from BALB/c mice immunized with peptides and recombinant fusion proteins. The mAbs SY-5, SJJ-3, NB-1, SY-1, HB-2, and TO-7 were shown to be specific for delta (Y), MB1 (X), Z, LMP2, LMP7, and LMP10, respectively, as they react specifically with the corresponding molecules when tested with a human B lymphoid LG2 cell lysate in Western blotting and with the peptide derived from each molecule in enzyme-linked immunosorbent assay. The reactivity of the six mAbs with the corresponding intracellular antigens resulted in intracellular staining when the mAbs were tested with microwave-treated and saponin-permeabilized cells in indirect immunofluorescence and with formalin-fixed, paraffin-embedded tissue sections in immunohistochemical reactions. These results suggest that the constitutive proteasome and immunoproteasome subunit-specific mAbs we have developed are useful probes to characterize the expression of proteasome subunits in normal tissues and in pathological lesions.
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Affiliation(s)
- N Bandoh
- Department of Immunology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
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50
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Ju SA, Lee SC, Kwon TH, Heo SK, Park SM, Paek HN, Suh JH, Cho HR, Kwon B, Kwon BS, Kim BS. Immunity to melanoma mediated by 4‐1BB is associated with enhanced activity of tumour‐infiltrating lymphocytes. Immunol Cell Biol 2005; 83:344-51. [PMID: 16033529 DOI: 10.1111/j.1440-1711.2005.01330.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
4-1BB costimulates T cells to carry out effector functions such as eradication of established tumours. 4-1BB (CD137) is a member of the TNF receptor family, and its triggering by either 4-1BB ligand or antibody ligation induces T-cell activation and growth. We analysed tumour-infiltrating lymphocytes (TIL) in the experimental B16F10 melanoma model to determine the mechanisms involved in 4-1BB-mediated tumour suppression. 4-1BB(+/+) mice survived longer than 4-1BB(-/-) mice, and survival was further prolonged by triggering 4-1BB with an agonistic mAb. The number of metastatic B16F10 colonies in the lung was much greater in 4-1BB(-/-) mice than in their 4-1BB(+/+) littermates. Administration of agonistic anti-4-1BB mAb increased the number of TIL in the tumour masses in the lungs of 4-1BB(+/+) mice. The numbers of CD4(+) T, CD8(+) T and CD11b(+) TIL increased in these mice. Anti-4-1BB mAb induced not only CD8(+) 4-1BB(+) T cells but also a CD8(+) IFN-gamma(+) T-cell population. B16F10 cells from the lungs of anti-4-1BB-treated mice showed enhanced expression of MHC class Iota and IotaIota antigens compared with the same cells from control IgG-treated mice. Thus, the increase in number of CD8(+) T cells and enhanced MHC Iota and IotaIota expression in B16F10 cells that result from augmented IFN-gamma production in response to anti-4-1BB mAb may lead to suppression of tumour growth and metastasis.
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MESH Headings
- Animals
- Antibodies, Monoclonal/immunology
- Antibodies, Monoclonal/pharmacology
- Antibodies, Monoclonal/therapeutic use
- Antigens, CD/immunology
- Antigens, CD/metabolism
- Cell Line, Tumor
- Cell Survival
- Flow Cytometry
- Interferons/biosynthesis
- Lung Neoplasms/immunology
- Lung Neoplasms/secondary
- Lymphocytes, Tumor-Infiltrating/cytology
- Lymphocytes, Tumor-Infiltrating/immunology
- Lymphocytes, Tumor-Infiltrating/metabolism
- Melanoma/drug therapy
- Melanoma/immunology
- Melanoma/pathology
- Mice
- Mice, Inbred C57BL
- Neoplasm Metastasis/drug therapy
- Neoplasm Metastasis/pathology
- Receptors, Nerve Growth Factor/agonists
- Receptors, Nerve Growth Factor/immunology
- Receptors, Nerve Growth Factor/metabolism
- Receptors, Tumor Necrosis Factor/agonists
- Receptors, Tumor Necrosis Factor/immunology
- Receptors, Tumor Necrosis Factor/metabolism
- T-Lymphocytes, Cytotoxic/cytology
- T-Lymphocytes, Cytotoxic/drug effects
- T-Lymphocytes, Cytotoxic/immunology
- Tumor Necrosis Factor Receptor Superfamily, Member 9
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Affiliation(s)
- Seong-A Ju
- Immunomodulation Research Center, University of Ulsan, Ulsan, Korea
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