1
|
Romero‐Castillo L, Li T, Do N, Sareila O, Xu B, Hennings V, Xu Z, Svensson C, Oliveira‐Coelho A, Sener Z, Urbonaviciute V, Ekwall O, Burkhardt H, Holmdahl R. Human MHC Class II and Invariant Chain Knock-in Mice Mimic Rheumatoid Arthritis with Allele Restriction in Immune Response and Arthritis Association. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2401513. [PMID: 38602454 PMCID: PMC11187888 DOI: 10.1002/advs.202401513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2024] [Indexed: 04/12/2024]
Abstract
Transgenic mice expressing human major histocompatibility complex class II (MHCII) risk alleles are widely used in autoimmune disease research, but limitations arise due to non-physiologic expression. To address this, physiologically relevant mouse models are established via knock-in technology to explore the role of MHCII in diseases like rheumatoid arthritis. The gene sequences encoding the ectodomains are replaced with the human DRB1*04:01 and 04:02 alleles, DRA, and CD74 (invariant chain) in C57BL/6N mice. The collagen type II (Col2a1) gene is modified to mimic human COL2. Importantly, DRB1*04:01 knock-in mice display physiologic expression of human MHCII also on thymic epithelial cells, in contrast to DRB1*04:01 transgenic mice. Humanization of the invariant chain enhances MHCII expression on thymic epithelial cells, increases mature B cell numbers in spleen, and improves antigen presentation. To validate its functionality, the collagen-induced arthritis (CIA) model is used, where DRB1*04:01 expression led to a higher susceptibility to arthritis, as compared with mice expressing DRB1*04:02. In addition, the humanized T cell epitope on COL2 allows autoreactive T cell-mediated arthritis development. In conclusion, the humanized knock-in mouse faithfully expresses MHCII, confirming the DRB1*04:01 alleles role in rheumatoid arthritis and being also useful for studying MHCII-associated diseases.
Collapse
MESH Headings
- Animals
- Mice
- Arthritis, Rheumatoid/genetics
- Arthritis, Rheumatoid/immunology
- Antigens, Differentiation, B-Lymphocyte/genetics
- Antigens, Differentiation, B-Lymphocyte/immunology
- Humans
- Disease Models, Animal
- Mice, Inbred C57BL
- Mice, Transgenic
- Gene Knock-In Techniques/methods
- Histocompatibility Antigens Class II/genetics
- Histocompatibility Antigens Class II/immunology
- Alleles
- Arthritis, Experimental/genetics
- Arthritis, Experimental/immunology
- HLA-DRB1 Chains/genetics
- HLA-DRB1 Chains/immunology
- Collagen Type II/genetics
- Collagen Type II/immunology
Collapse
Affiliation(s)
- Laura Romero‐Castillo
- Medical Inflammation ResearchDivision of ImmunologyDepartment of Medical Biochemistry and BiophysicsKarolinska InstituteStockholm17177Sweden
| | - Taotao Li
- Medical Inflammation ResearchDivision of ImmunologyDepartment of Medical Biochemistry and BiophysicsKarolinska InstituteStockholm17177Sweden
| | - Nhu‐Nguyen Do
- Medical Inflammation ResearchDivision of ImmunologyDepartment of Medical Biochemistry and BiophysicsKarolinska InstituteStockholm17177Sweden
- Fraunhofer Institute for Translational Medicine and Pharmacology ITMPFraunhofer Cluster of Excellence for Immune‐Mediated Diseases CIMDTheodor‐Stern‐Kai 760596Frankfurt am MainGermany
| | - Outi Sareila
- Medical Inflammation ResearchDivision of ImmunologyDepartment of Medical Biochemistry and BiophysicsKarolinska InstituteStockholm17177Sweden
- Medical Inflammation ResearchMediCity Research LaboratoryUniversity of TurkuTurkuFI‐20520Finland
| | - Bingze Xu
- Medical Inflammation ResearchDivision of ImmunologyDepartment of Medical Biochemistry and BiophysicsKarolinska InstituteStockholm17177Sweden
| | - Viktoria Hennings
- Department of PediatricsInstitute of Clinical Sciences and Department of Rheumatology and Inflammation ResearchInstitute of MedicineThe Sahlgrenska AcademyUniversity of GothenburgGothenburg41345Sweden
| | - Zhongwei Xu
- Medical Inflammation ResearchDivision of ImmunologyDepartment of Medical Biochemistry and BiophysicsKarolinska InstituteStockholm17177Sweden
| | - Carolin Svensson
- Medical Inflammation ResearchDivision of ImmunologyDepartment of Medical Biochemistry and BiophysicsKarolinska InstituteStockholm17177Sweden
| | - Ana Oliveira‐Coelho
- Medical Inflammation ResearchDivision of ImmunologyDepartment of Medical Biochemistry and BiophysicsKarolinska InstituteStockholm17177Sweden
| | - Zeynep Sener
- Medical Inflammation ResearchDivision of ImmunologyDepartment of Medical Biochemistry and BiophysicsKarolinska InstituteStockholm17177Sweden
| | - Vilma Urbonaviciute
- Medical Inflammation ResearchDivision of ImmunologyDepartment of Medical Biochemistry and BiophysicsKarolinska InstituteStockholm17177Sweden
| | - Olov Ekwall
- Department of PediatricsInstitute of Clinical Sciences and Department of Rheumatology and Inflammation ResearchInstitute of MedicineThe Sahlgrenska AcademyUniversity of GothenburgGothenburg41345Sweden
| | - Harald Burkhardt
- Fraunhofer Institute for Translational Medicine and Pharmacology ITMPFraunhofer Cluster of Excellence for Immune‐Mediated Diseases CIMDTheodor‐Stern‐Kai 760596Frankfurt am MainGermany
- Division of RheumatologyUniversity Hospital FrankfurtGoethe University60590Frankfurt am MainGermany
| | - Rikard Holmdahl
- Medical Inflammation ResearchDivision of ImmunologyDepartment of Medical Biochemistry and BiophysicsKarolinska InstituteStockholm17177Sweden
- Medical Inflammation ResearchMediCity Research LaboratoryUniversity of TurkuTurkuFI‐20520Finland
| |
Collapse
|
2
|
Simhadri VL, McGill JR, Sauna ZE. Endotoxin contamination in commercially available Cas9 proteins potentially induces T-cell mediated responses. Gene Ther 2023; 30:575-580. [PMID: 34744169 DOI: 10.1038/s41434-021-00301-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 10/08/2021] [Accepted: 10/20/2021] [Indexed: 11/09/2022]
Abstract
Immune responses to Cas proteins have been demonstrated recently and these may prove to be an impediment to their clinical use in gene editing. To make meaningful assessments of Cas9 immunogenicity during drug development and licensure it is imperative the reagents are free of impurities that could affect in vitro assessments of immunogenicity. Here we address the issue of endotoxin levels in laboratory grade Cas9 proteins used to measure T-cell memory responses. Many of these reagents have not been developed for immunogenicity assays, are or microbial origin and carry varying levels of endotoxin. The use of these reagents, off the shelf, without measuring endotoxin levels is likely to introduce incorrect estimates of the prevalence of memory T-cell responses in research studies. We demonstrate wide variation in endotoxin levels in Cas9 proteins from seven suppliers. Different lots from the same supplier also contained varying levels of endotoxin. ELISPOT assays showed similar large variations in the interferon-γ signals. Finally, when we carried out endotoxin depletion in four Cas9 proteins with strong signals in the ELISPOT assay, we found dampening of the interferon-γ signals.
Collapse
Affiliation(s)
- Vijaya L Simhadri
- Hemostasis Branch, Division of Plasma Protein Therapeutics, Office of Tissues and Advanced Therapies, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD, USA
| | - Joseph R McGill
- Hemostasis Branch, Division of Plasma Protein Therapeutics, Office of Tissues and Advanced Therapies, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD, USA
| | - Zuben E Sauna
- Hemostasis Branch, Division of Plasma Protein Therapeutics, Office of Tissues and Advanced Therapies, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD, USA.
| |
Collapse
|
3
|
The cathepsin-S/protease-activated receptor-(PAR)-2 axis drives chronic allograft vasculopathy and is a molecular target for therapeutic intervention. Transpl Immunol 2023; 77:101782. [PMID: 36608832 DOI: 10.1016/j.trim.2022.101782] [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: 08/28/2022] [Accepted: 12/31/2022] [Indexed: 01/05/2023]
Abstract
BACKGROUND Cathepsin S (CatS) and proteinase-activated receptor (PAR)-2 are involved in the remodelling of vascular walls and neointima formation as well as in alloantigen presentation and T-cell priming. Therefore, we hypothesized that CatS/PAR-2 inhibition/deficiency would attenuate chronic allograft vasculopathy. METHODS Heterotopic aortic murine transplantation was performed from C57BL/6J donors to C57BL/6J recipients (syngeneic control group), Balb/c to C57BL/6J without treatment (allogenic control group), Balb/c to C57BL/6J with twice daily oral CatS inhibitor (allogenic treatment group) and Balb/c to Par2-/- C57BL/6J (allogenic knockout group). The recipients were sacrificed on day 28 and the grafts were harvested for histological analysis and RT-qPCR. RESULTS After 28 days, mice of the allogenic control group exhibited significant neointima formation and massive CD8 T-cell infiltration into the neointima while the syngeneic control group showed negligible allograft vasculopathy. The mRNA expression level of CatS in allografts was 5-fold of those in syngeneic grafts. Neointima formation and therefore intima/media-ratio were significantly decreased in the treatment and knockout group in comparison to the allogenic control group. Mice in treatment group also displayed significantly fewer CD8 T cells in the neointima compared with allogeneic controls. Additionally, treatment with the CatS inhibitor and PAR2-deficiency decreased mRNA-levels of interleukins and cytokines. CONCLUSION In conclusion, our data indicate that inhibiting CatS and PAR-2 deficiency led to a marked reduction of neointima formation and associated inflammation in a murine heterotopic model for allograft vasculopathy.
Collapse
|
4
|
El-Sayed N, Korotchenko E, Scheiblhofer S, Weiss R, Schneider M. Functionalized multifunctional nanovaccine for targeting dendritic cells and modulation of immune response. Int J Pharm 2021; 593:120123. [DOI: 10.1016/j.ijpharm.2020.120123] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 11/19/2020] [Accepted: 11/23/2020] [Indexed: 02/08/2023]
|
5
|
Lecours C, St-Pierre MK, Picard K, Bordeleau M, Bourque M, Awogbindin IO, Benadjal A, Ibanez FG, Gagnon D, Cantin L, Parent M, Di Paolo T, Tremblay ME. Levodopa partially rescues microglial numerical, morphological, and phagolysosomal alterations in a monkey model of Parkinson's disease. Brain Behav Immun 2020; 90:81-96. [PMID: 32755645 DOI: 10.1016/j.bbi.2020.07.044] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Revised: 07/23/2020] [Accepted: 07/29/2020] [Indexed: 02/07/2023] Open
Abstract
Parkinson's disease (PD) is the most common neurodegenerative motor disorder. The mechanisms underlying the onset and progression of Levodopa (L-Dopa)-induced dyskinesia (LID) during PD treatment remain elusive. Emerging evidence implicates functional modification of microglia in the development of LID. Thus, understanding the link between microglia and the development of LID may provide the knowledge required to preserve or promote beneficial microglial functions, even during a prolonged L-Dopa treatment. To provide novel insights into microglial functional alterations in PD pathophysiology, we characterized their density, morphology, ultrastructure, and degradation activity in the sensorimotor functional territory of the putamen, using 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) cynomolgus monkeys. A subset of MPTP monkeys was treated orally with L-Dopa and developed LID similar to PD patients. Using a combination of light, confocal and transmission electron microscopy, our quantitative analyses revealed alterations of microglial density, morphology and phagolysosomal activity following MPTP intoxication that were partially normalized with L-Dopa treatment. In particular, microglial density, cell body and arborization areas were increased in the MPTP monkeys, whereas L-Dopa-treated MPTP animals presented a microglial phenotype similar to the control animals. At the ultrastructural level, microglia did not differ between groups in their markers of cellular stress or aging. Nevertheless, microglia from the MPTP monkeys displayed reduced numbers of endosomes, compared with control animals, that remained lower after L-Dopa treatment. Microglia from MPTP monkeys treated with L-Dopa also had increased numbers of primary lysosomes compared with non-treated MPTP animals, while secondary and tertiary lysosomes remained unchanged. Moreover, a decrease microglial immunoreactivity for CD68, considered a marker of phagocytosis and lysosomal activity, was measured in the MPTP monkeys treated with L-Dopa, compared with non-treated MPTP animals. Taken together, these findings revealed significant changes in microglia during PD pathophysiology that were partially rescued by L-Dopa treatment. Albeit, this L-Dopa treatment conferred phagolysosomal insufficiency on microglia in the dyskinetic Parkinsonian monkeys.
Collapse
Affiliation(s)
- Cynthia Lecours
- Axe Neurosciences, Centre de Recherche du CHU de Québec-Université Laval, Québec, QC, Canada; Faculté de Pharmacie, Université Laval, Québec, QC, Canada
| | - Marie-Kim St-Pierre
- Axe Neurosciences, Centre de Recherche du CHU de Québec-Université Laval, Québec, QC, Canada
| | - Katherine Picard
- Axe Neurosciences, Centre de Recherche du CHU de Québec-Université Laval, Québec, QC, Canada
| | - Maude Bordeleau
- Axe Neurosciences, Centre de Recherche du CHU de Québec-Université Laval, Québec, QC, Canada; Integrated Program of Neuroscience, Faculty of Medicine, McGill University, Montréal, QC, Canada
| | - Melanie Bourque
- Axe Neurosciences, Centre de Recherche du CHU de Québec-Université Laval, Québec, QC, Canada
| | - Ifeoluwa Oluleke Awogbindin
- Axe Neurosciences, Centre de Recherche du CHU de Québec-Université Laval, Québec, QC, Canada; Neuroimmunology Group, Molecular Drug Metabolism and Toxicology Laboratory, Department of Biochemistry, University of Ibadan, Ibadan, Nigeria
| | - Amin Benadjal
- Axe Neurosciences, Centre de Recherche du CHU de Québec-Université Laval, Québec, QC, Canada; Biologie Intégrative et Physiologie, Sorbonne Université, Paris VI, France
| | | | - Dave Gagnon
- Département de Psychiatrie et de Neurosciences, Faculté de Médecine, Université Laval, Québec, QC, Canada; CERVO Brain Research Center, Québec, QC, Canada
| | - Leo Cantin
- Axe Neurosciences, Centre de Recherche du CHU de Québec-Université Laval, Québec, QC, Canada; Département de Chirurgie, Faculté de Médecine, Université Laval, Québec, QC, Canada
| | - Martin Parent
- Département de Psychiatrie et de Neurosciences, Faculté de Médecine, Université Laval, Québec, QC, Canada; CERVO Brain Research Center, Québec, QC, Canada
| | - Therese Di Paolo
- Axe Neurosciences, Centre de Recherche du CHU de Québec-Université Laval, Québec, QC, Canada; Faculté de Pharmacie, Université Laval, Québec, QC, Canada.
| | - Marie-Eve Tremblay
- Axe Neurosciences, Centre de Recherche du CHU de Québec-Université Laval, Québec, QC, Canada; Département de Médecine Moléculaire, Faculté de Médecine, Université Laval, Québec, QC, Canada; Division of Medical Sciences, University of Victoria, Victoria, BC, Canada; Department of Biochemistry and Molecular Biology, The University of British Columbia, Vancouver, BC, Canada.
| |
Collapse
|
6
|
Schijns V, Fernández-Tejada A, Barjaktarović Ž, Bouzalas I, Brimnes J, Chernysh S, Gizurarson S, Gursel I, Jakopin Ž, Lawrenz M, Nativi C, Paul S, Pedersen GK, Rosano C, Ruiz-de-Angulo A, Slütter B, Thakur A, Christensen D, Lavelle EC. Modulation of immune responses using adjuvants to facilitate therapeutic vaccination. Immunol Rev 2020; 296:169-190. [PMID: 32594569 PMCID: PMC7497245 DOI: 10.1111/imr.12889] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 04/30/2020] [Accepted: 05/20/2020] [Indexed: 12/14/2022]
Abstract
Therapeutic vaccination offers great promise as an intervention for a diversity of infectious and non-infectious conditions. Given that most chronic health conditions are thought to have an immune component, vaccination can at least in principle be proposed as a therapeutic strategy. Understanding the nature of protective immunity is of vital importance, and the progress made in recent years in defining the nature of pathological and protective immunity for a range of diseases has provided an impetus to devise strategies to promote such responses in a targeted manner. However, in many cases, limited progress has been made in clinical adoption of such approaches. This in part results from a lack of safe and effective vaccine adjuvants that can be used to promote protective immunity and/or reduce deleterious immune responses. Although somewhat simplistic, it is possible to divide therapeutic vaccine approaches into those targeting conditions where antibody responses can mediate protection and those where the principal focus is the promotion of effector and memory cellular immunity or the reduction of damaging cellular immune responses as in the case of autoimmune diseases. Clearly, in all cases of antigen-specific immunotherapy, the identification of protective antigens is a vital first step. There are many challenges to developing therapeutic vaccines beyond those associated with prophylactic diseases including the ongoing immune responses in patients, patient heterogeneity, and diversity in the type and stage of disease. If reproducible biomarkers can be defined, these could allow earlier diagnosis and intervention and likely increase therapeutic vaccine efficacy. Current immunomodulatory approaches related to adoptive cell transfers or passive antibody therapy are showing great promise, but these are outside the scope of this review which will focus on the potential for adjuvanted therapeutic active vaccination strategies.
Collapse
Affiliation(s)
- Virgil Schijns
- Wageningen University, Cell Biology & Immunology and, ERC-The Netherlands, Schaijk, Landerd campus, The Netherlands
| | - Alberto Fernández-Tejada
- Chemical Immunology Lab, Center for Cooperative Research in Biosciences, CIC bioGUNE, Biscay, Spain.,Ikerbasque, Basque Foundation for Science, Bilbao, Spain
| | - Žarko Barjaktarović
- Agency for Medicines and Medical Devices of Montenegro, Podgorica, Montenegro
| | - Ilias Bouzalas
- Hellenic Agricultural Organization-DEMETER, Veterinary Research Institute, Thessaloniki, Greece
| | | | - Sergey Chernysh
- Laboratory of Insect Biopharmacology and Immunology, Department of Entomology, Saint-Petersburg State University, Saint-Petersburg, Russia
| | | | | | - Žiga Jakopin
- Faculty of Pharmacy, University of Ljubljana, Ljubljana, Slovenia
| | - Maria Lawrenz
- Vaccine Formulation Institute (CH), Geneva, Switzerland
| | - Cristina Nativi
- Department of Chemistry, University of Florence, Florence, Italy
| | | | | | | | - Ane Ruiz-de-Angulo
- Chemical Immunology Lab, Center for Cooperative Research in Biosciences, CIC bioGUNE, Biscay, Spain
| | - Bram Slütter
- Div. BioTherapeutics, Leiden Academic Centre for Drug Research, Leiden University, Leiden, The Netherlands
| | | | | | - Ed C Lavelle
- Adjuvant Research Group, School of Biochemistry and Immunology, Trinity College Dublin, Dublin, Ireland
| |
Collapse
|
7
|
Lecours C, Bordeleau M, Cantin L, Parent M, Paolo TD, Tremblay MÈ. Microglial Implication in Parkinson's Disease: Loss of Beneficial Physiological Roles or Gain of Inflammatory Functions? Front Cell Neurosci 2018; 12:282. [PMID: 30214398 PMCID: PMC6125334 DOI: 10.3389/fncel.2018.00282] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 08/09/2018] [Indexed: 01/12/2023] Open
Abstract
Microglia, often described as the brain-resident macrophages, play crucial roles in central nervous system development, maintenance, plasticity, and adaptation to the environment. Both aging and chronic stress promote microglial morphological and functional changes, which can lead to the development of brain pathologies including Parkinson's disease (PD). Indeed, aging, and chronic stress represent main environmental risk factors for PD. In these conditions, microglia are known to undergo different morphological and functional changes. Inflammation is an important component of PD and disequilibrium between pro- and anti-inflammatory microglial functions might constitute a crucial component of PD onset and progression. Cumulated data also suggest that, during PD, microglia might lose beneficial functions and gain detrimental ones, in addition to mediating inflammation. In this mini-review, we aim to summarize the literature discussing the functional and morphological changes that microglia undergo in PD pathophysiology and upon exposure to its two main environmental risk factors, aging, and chronic stress.
Collapse
Affiliation(s)
- Cynthia Lecours
- Axe Neurosciences, Centre de Recherche du CHU de Québec, Université Laval, Quebec, QC, Canada
- Faculté de Pharmacie, Université Laval, Quebec, QC, Canada
| | - Maude Bordeleau
- Axe Neurosciences, Centre de Recherche du CHU de Québec, Université Laval, Quebec, QC, Canada
- Integrated Program of Neuroscience, Faculty of Medicine, McGill University, Montréal, QC, Canada
| | - Léo Cantin
- Axe Neurosciences, Centre de Recherche du CHU de Québec, Université Laval, Quebec, QC, Canada
- Département de Chirurgie, Faculté de Médecine, Université Laval, Quebec, QC, Canada
| | - Martin Parent
- CERVO Brain Research Centre, Quebec, QC, Canada
- Département de Psychiatrie et Neurosciences, Faculté de Médecine, Université Laval, Quebec, QC, Canada
| | - Thérèse Di Paolo
- Axe Neurosciences, Centre de Recherche du CHU de Québec, Université Laval, Quebec, QC, Canada
- Faculté de Pharmacie, Université Laval, Quebec, QC, Canada
| | - Marie-Ève Tremblay
- Axe Neurosciences, Centre de Recherche du CHU de Québec, Université Laval, Quebec, QC, Canada
- Département de Médecine Moléculaire, Faculté de Médecine, Université Laval, Quebec, QC, Canada
| |
Collapse
|
8
|
Chiu E, Gold T, Fettig V, LeVasseur MT, Cressman DE. Identification of a nuclear export sequence in the MHC CIITA. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2015; 194:6102-11. [PMID: 25948812 DOI: 10.4049/jimmunol.1402026] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Accepted: 04/02/2015] [Indexed: 01/15/2023]
Abstract
Initiation of an immune response through expression of MHC class II and related genes is under the control of the CIITA. Normally found in both the cytoplasm and nucleus, CIITA is tightly controlled by a variety of posttranslational modifications as well as interactions with other nuclear and cytoplasmic factors, whereas disruption of this dual subcellular localization impairs CIITA functioning and expression of target genes. Although CIITA has well-defined domains necessary for its nuclear import, the region responsible for the translocation of CIITA from the nucleus has not been characterized. In this study, we identify a leucine-rich motif at residues 717-724 that bears strong homology to known nuclear export sequence (NES) domains. Mutation of this region renders CIITA insensitive to treatment with leptomycin B, an inhibitor of nuclear export, whereas fusion of this domain to a heterologous GFP is sufficient to induce its export to the cytoplasm or cause its retention in the nucleus following leptomycin B treatment. Point mutations of specific leucine residues within the NES disrupt the normal subcellular distribution of the full-length CIITA, impair its ability to interact with the nuclear export factor CRM1, and enhance CIITA-induced gene expression from an MHC class II gene promoter. IFN-γ stimulation of class II genes is further enhanced by inhibiting the nuclear export of endogenous CIITA. Collectively, these data demonstrate the first identification of a specific NES within CIITA and place it among the other protein domains that contribute to the posttranslational regulation of CIITA activity.
Collapse
Affiliation(s)
- Emily Chiu
- Department of Biology, Sarah Lawrence College, Bronxville, NY 10708
| | - Theresa Gold
- Department of Biology, Sarah Lawrence College, Bronxville, NY 10708
| | - Veronica Fettig
- Department of Biology, Sarah Lawrence College, Bronxville, NY 10708
| | | | - Drew E Cressman
- Department of Biology, Sarah Lawrence College, Bronxville, NY 10708
| |
Collapse
|
9
|
Squebola-Cola DM, De Mello GC, Anhê GF, Condino-Neto A, DeSouza IA, Antunes E. Staphylococcus aureus enterotoxins A and B inhibit human and mice eosinophil chemotaxis and adhesion in vitro. Int Immunopharmacol 2014; 23:664-71. [PMID: 25445958 DOI: 10.1016/j.intimp.2014.10.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Revised: 10/02/2014] [Accepted: 10/22/2014] [Indexed: 01/21/2023]
Abstract
Staphylococcus aureus aggravates the allergic eosinophilic inflammation. We hypothesized that Staphylococcus aureus-derived enterotoxins directly affect eosinophil functions. Therefore, this study investigated the effects of Staphylococcal enterotoxins A and B (SEA and SEB) on human and mice eosinophil chemotaxis and adhesion in vitro, focusing on p38 MAPK phosphorylation and intracellular Ca(2+) mobilization. Eosinophil chemotaxis was evaluated using a microchemotaxis chamber, whereas adhesion was performed in VCAM-1 and ICAM-1-coated plates. Measurement of p38 MAPK phosphorylation and intracellular Ca(2+) levels were monitored by flow cytometry and fluorogenic calcium-binding dye, respectively. Prior incubation (30 to 240 min) of human blood eosinophils with SEA (0.5 to 3 ng/ml) significantly reduced eotaxin-, PAF- and RANTES-induced chemotaxis (P<0.05). Likewise, SEB (1 ng/ml, 30 min) significantly reduced eotaxin-induced human eosinophil chemotaxis (P<0.05). The reduction of eotaxin-induced human eosinophil chemotaxis by SEA and SEB was prevented by anti-MHC monoclonal antibody (1 μg/ml). In addition, SEA and SEB nearly suppressed the eotaxin-induced human eosinophil adhesion in ICAM-1- and VCAM-1-coated plates. SEA and SEB prevented the increases of p38 MAPK phosphorylation and Ca(2+) levels in eotaxin-activated human eosinophils. In separate protocols, we evaluated the effects of SEA on chemotaxis and adhesion of eosinophils obtained from mice bone marrow. SEA (10 ng/ml) significantly reduced the eotaxin-induced chemotaxis along with cell adhesion to both ICAM-1 and VCAM-1-coated plates (P<0.05). In conclusion, the inhibition by SEA and SEB of eosinophil functions (chemotaxis and adhesion) are associated with reductions of p38 MAPK phosphorylation and intracellular Ca(2+) mobilization.
Collapse
Affiliation(s)
- Dalize M Squebola-Cola
- Department of Pharmacology, Faculty of Medical Sciences, University of Campinas (UNICAMP), São Paulo, Brazil
| | - Glaucia C De Mello
- Department of Pharmacology, Faculty of Medical Sciences, University of Campinas (UNICAMP), São Paulo, Brazil
| | - Gabriel F Anhê
- Department of Pharmacology, Faculty of Medical Sciences, University of Campinas (UNICAMP), São Paulo, Brazil
| | - Antonio Condino-Neto
- Department of Immunology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Ivani A DeSouza
- Department of Biology and Physiology, Faculty of Medicine of Jundiai (FMJ), São Paulo, Brazil
| | - Edson Antunes
- Department of Pharmacology, Faculty of Medical Sciences, University of Campinas (UNICAMP), São Paulo, Brazil.
| |
Collapse
|
10
|
Abstract
The mammalian immune system has evolved to display peptides derived from microbial antigens to immune effector cells. Liberated from the intact antigens through distinct proteolytic mechanisms, these peptides are subsequently transported to the cell surface while bound to chaperone-like receptors known as major histocompatibility complex molecules. These complexes are then scrutinized by T-cells that express receptors with specificity for specific major histocompatibility complex-peptide complexes. In normal uninfected cells, this process of antigen processing and presentation occurs continuously, with the resultant array of self-antigen-derived peptides displayed on the surface of these cells. Changes in this cellular peptide array alert the immune system to changes in the intracellular environment that may be associated with infection, oncogenesis or other abnormal cellular processes, resulting in a cascade of events that result in the elimination of the abnormal cell. Since peptides play such an essential role in informing the immune system of infection with viral or microbial pathogens and the transformation of cells in malignancy, the tools of proteomics, in particular mass spectrometry, are ideally suited to study these immune responses at a molecular level. Recent advances in studies of immune responses that have utilized mass spectrometry and associated technologies are reviewed. The authors gaze into the future and look at current challenges and where proteomics will impact in immunology over the next 5 years.
Collapse
Affiliation(s)
- Nicholas A Williamson
- The University of Melbourne, Department of Biochemistry & Molecular Biology, The Bio21 Molecular Science & Biotechnology Institute, 3010, Victoria, Australia.
| | | |
Collapse
|
11
|
Dual-targeting immunotherapy of lymphoma: potent cytotoxicity of anti-CD20/CD74 bispecific antibodies in mantle cell and other lymphomas. Blood 2012; 119:3767-78. [DOI: 10.1182/blood-2011-09-381988] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Abstract
We describe the use of novel bispecific hexavalent Abs (HexAbs) to enhance anticancer immunotherapy. Two bispecific HexAbs [IgG-(Fab)4 constructed from veltuzumab (anti-CD20 IgG) and milatuzumab (anti-CD74 IgG)] show enhanced cytotoxicity in mantle cell lymphoma (MCL) and other lymphoma/leukemia cell lines, as well as patient tumor samples, without a crosslinking Ab, compared with their parental mAb counterparts, alone or in combination. The bispecific HexAbs have different properties from and are more potent than their parental mAbs in vitro. The juxtaposition of CD20 and CD74 on MCL cells by the HexAbs resulted in homotypic adhesion and triggered intracellular changes that include loss of mitochondrial transmembrane potential, production of reactive oxygen species, rapid and sustained phosphorylation of ERKs and JNK, down-regulation of pAkt and Bcl-xL, actin reorganization, and lysosomal membrane permeabilization, culminating in cell death. They also displayed different potencies in depleting lymphoma cells and normal B cells from whole blood ex vivo and significantly extended the survival of nude mice bearing MCL xenografts in a dose-dependent manner, thus indicating stability and antitumor activity in vivo. Such bispecific HexAbs may constitute a new class of therapeutic agents for improved cancer immunotherapy, as shown here for MCL and other CD20+/CD74+ malignancies.
Collapse
|
12
|
The possible role of genetic variants in autoimmune-related genes in the development of endometriosis. Hum Immunol 2012; 73:306-15. [DOI: 10.1016/j.humimm.2011.12.009] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2011] [Revised: 11/21/2011] [Accepted: 12/06/2011] [Indexed: 11/18/2022]
|
13
|
Megiorni F, Pizzuti A, Mora B, Rizzuti A, Garelli V, Maxia C, Carlesimo M, Fotruna M, Delle Chiaie R, Cavaggioni G, Rossi A. Genetic association of
HLA‐DQB1
and
HLA‐DRB1
polymorphisms with alopecia areata in the Italian population. Br J Dermatol 2011; 165:823-7. [DOI: 10.1111/j.1365-2133.2011.10466.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
| | | | - B. Mora
- Departments of Experimental Medicine,
| | | | - V. Garelli
- Internal Medicine and Medical Specialities,
| | - C. Maxia
- Internal Medicine and Medical Specialities,
| | | | | | | | - G. Cavaggioni
- U.O.D. Psychotherapy – Department of Neurology and Psychiatry NPD03, ‘Sapienza’ University of Rome, Viale Regina Elena 324, 00161 Rome, Italy
| | - A. Rossi
- Internal Medicine and Medical Specialities,
| |
Collapse
|
14
|
Abstract
Bovine respiratory tract disease is a multi-factorial disease complex involving several viruses and bacteria. Viruses that play prominent roles in causing the bovine respiratory disease complex include bovine herpesvirus-1, bovine respiratory syncytial virus, bovine viral diarrhea virus and parinfluenza-3 virus. Bacteria that play prominent roles in this disease complex are Mannheimia haemolytica and Mycoplasma bovis. Other bacteria that infect the bovine respiratory tract of cattle are Histophilus (Haemophilus) somni and Pasteurella multocida. Frequently, severe respiratory tract disease in cattle is associated with concurrent infections of these pathogens. Like other pathogens, the viral and bacterial pathogens of this disease complex have co-evolved with their hosts over millions of years. As much as the hosts have diversified and fine-tuned the components of their immune system, the pathogens have also evolved diverse and sophisticated strategies to evade the host immune responses. These pathogens have developed intricate mechanisms to thwart both the innate and adaptive arms of the immune responses of their hosts. This review presents an overview of the strategies by which the pathogens suppress host immune responses, as well as the strategies by which the pathogens modify themselves or their locations in the host to evade host immune responses. These immune evasion strategies likely contribute to the failure of currently-available vaccines to provide complete protection to cattle against these pathogens.
Collapse
|
15
|
Kennedy LJ, Angles JM, Barnes A, Carmichael LE, Radford AD, Ollier WER, Happ GM. DLA-DRB1, DQA1, and DQB1 alleles and haplotypes in North American Gray Wolves. ACTA ACUST UNITED AC 2007; 98:491-9. [PMID: 17611255 DOI: 10.1093/jhered/esm051] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
The canine major histocompatibility complex contains highly polymorphic genes, many of which are critical in regulating immune response. Since domestic dogs evolved from Gray Wolves (Canis lupus), common DLA class II alleles should exist. Sequencing was used to characterize 175 Gray Wolves for DLA class II alleles, and data from 1856 dogs, covering 85 different breeds of mostly European origin, were available for comparison. Within wolves, 28 new alleles were identified, all occurring in at least 2 individuals. Three DLA-DRB1, 8 DLA-DQA1, and 6 DLA-DQB1 alleles also identified in dogs were present. Twenty-eight haplotypes were identified, of which 2 three-locus haplotypes, and many DLA-DQA1/DQB1 haplotypes, are also found in dogs. The wolves studied had relatively few dog DLA alleles and may therefore represent a remnant population descended from Asian wolves. The single European wolf included carried a haplotype found in both these North American wolves and in many dog breeds. Furthermore, one wolf DQB1 allele has been found in Shih Tzu, a breed of Asian origin. These data suggest that the wolf ancestors of Asian and European dogs may have had different gene pools, currently reflected in the DLA alleles present in dog breeds.
Collapse
Affiliation(s)
- Lorna J Kennedy
- Centre for Integrated Genomic Medical Research, University of Manchester, Stopford Building, Oxford Road, Manchester, M13 9PT, UK.
| | | | | | | | | | | | | |
Collapse
|
16
|
Caipang CMA, Hirono I, Aoki T. Immunogenicity, retention and protective effects of the protein derivatives of formalin-inactivated red seabream iridovirus (RSIV) vaccine in red seabream, Pagrus major. FISH & SHELLFISH IMMUNOLOGY 2006; 20:597-609. [PMID: 16213752 DOI: 10.1016/j.fsi.2005.08.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2005] [Revised: 07/25/2005] [Accepted: 08/10/2005] [Indexed: 05/04/2023]
Abstract
A formalin-inactivated virus was previously found to be efficient in protecting fish against challenge with red seabream iridovirus (RSIV), a DNA virus belonging to the Iridoviridae family. In the present study, we determined the amount of the virus in the vaccine in terms of the number of copies of the gene for the major capsid protein (MCP) gene by quantitative real-time PCR and examined the longevity and types of immune response generated after intramuscular vaccination. We also tested whether the protein components of the vaccine are able to mount a protective immune response in fish. The vaccine contained 10(7) MCP copies per microliter of vaccine, and was detected in blood, kidney and spleen of vaccinated fish up to 15 days post-vaccination. Fish vaccinated with either the intact formalin-inactivated vaccine or its protein derivatives had increased serum neutralization antibodies and enhanced expression of MHC class I, although the kinetics of expression varied among groups. However, only those vaccinated with the intact vaccine survived the virus challenge, and this indicates that serum neutralization antibodies have scarce role in protecting the fish against RSIV. We hypothesize that the cell-mediated immunity, particularly the MHC class I pathway is responsible for such protection.
Collapse
Affiliation(s)
- Christopher Marlowe A Caipang
- Laboratory of Genome Science, Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato, Tokyo 108-8477, Japan
| | | | | |
Collapse
|
17
|
Purcell AW, Gorman JJ. Immunoproteomics: Mass spectrometry-based methods to study the targets of the immune response. Mol Cell Proteomics 2004; 3:193-208. [PMID: 14718575 DOI: 10.1074/mcp.r300013-mcp200] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The mammalian immune system has evolved to display fragments of protein antigens derived from microbial pathogens to immune effector cells. These fragments are typically peptides liberated from the intact antigens through distinct proteolytic mechanisms that are subsequently transported to the cell surface bound to chaperone-like receptors known as major histocompatibility complex (MHC) molecules. These complexes are then scrutinized by effector T cells that express clonally distributed T cell receptors with specificity for specific MHC-peptide complexes. In normal uninfected cells, this process of antigen processing and presentation occurs continuously, with the resultant array of self-antigen-derived peptides displayed on the surface of these cells. Changes in this peptide landscape of cells act to alert immune effector cells to changes in the intracellular environment that may be associated with infection, malignant transformation, or other abnormal cellular processes, resulting in a cascade of events that result in their elimination. Because peptides play such a crucial role in informing the immune system of infection with viral or microbial pathogens and the transformation of cells in malignancy, the tools of proteomics, in particular mass spectrometry, are ideally suited to study these immune responses at a molecular level. Here we review recent advances in the studies of immune responses that have utilized mass spectrometry and associated technologies, with specific examples from collaboration between our laboratories.
Collapse
Affiliation(s)
- A W Purcell
- Department of Microbiology and Immunology and ImmunoID, The University of Melbourne, Victoria 3010, Australia.
| | | |
Collapse
|
18
|
Purcell AW, Zeng W, Mifsud NA, Ely LK, Macdonald WA, Jackson DC. Dissecting the role of peptides in the immune response: theory, practice and the application to vaccine design. J Pept Sci 2003; 9:255-81. [PMID: 12803494 DOI: 10.1002/psc.456] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Analytical biochemistry and synthetic peptide based chemistry have helped to reveal the pivotal role that peptides play in determining the specificity, magnitude and quality of both humoral (antibody) and cellular (cytotoxic and helper T cell) immune responses. In addition, peptide based technologies are now at the forefront of vaccine design and medical diagnostics. The chemical technologies used to assemble peptides into immunogenic structures have made great strides over the past decade and assembly of highly pure peptides which can be incorporated into high molecular weight species, multimeric and even branched structures together with non-peptidic material is now routine. These structures have a wide range of applications in designer vaccines and diagnostic reagents. Thus the tools of the peptide chemist are exquisitely placed to answer questions about immune recognition and along the way to provide us with new and improved vaccines and diagnostics.
Collapse
Affiliation(s)
- Anthony W Purcell
- Department of Microbiology and Immunology, The University of Melbourne, Parkville, Victoria 3010, Australia.
| | | | | | | | | | | |
Collapse
|
19
|
Solomon MF, Kuziel WA, Mann DA, Simeonovic CJ. The role of chemokines and their receptors in the rejection of pig islet tissue xenografts. Xenotransplantation 2003; 10:164-77. [PMID: 12588649 DOI: 10.1034/j.1399-3089.2003.01146.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The mechanism by which inflammatory cells are recruited to pig islet tissue (proislet) xenografts was investigated by examining the intragraft mRNA expression of murine alpha- and beta-chemokines in CBA/H mice from days 3 to 10 post-transplant. Xenograft rejection was associated with early intragraft transcript expression for monocyte chemotactic protein-1 (MCP-1) (3 to 5 days), IP-10 (3 to 4 days) and macrophage inflammatory protein-1alpha (MIP-1alpha) (3 to 5 days) and subsequent expression of eotaxin (days 4 to 10), MIP-1beta (days 4 and 5) and regulated on activation, normal T cell expressed and secreted (RANTES) (days 4 to 6) mRNA. This pattern was consistent with the early recruitment of macrophages (MCP-1, MIP-1alpha), the influx of CD4 T cells (MCP-1, MIP-1alpha, MIP-1beta, IP-10 and RANTES) and the characteristic infiltrate of eosinophils (eotaxin and RANTES) associated with islet xenograft rejection. Inhibition of beta-chemokine signaling in CCR2-/- mice (which lack the major co-receptor for MCP-1) resulted in retarded macrophage and CD4 T cell recruitment, enhanced eosinophil influx and a minor delay in rejection, compared with wildtype mice; there was little effect on leukocyte infiltration in xenografts harvested from CCR5-/- mice (lacking the co-receptor for MIP-1alpha, MIP-1beta and RANTES). The impeded migration of leukocytes into xenografts in CCR2-/- hosts was associated with delayed intragraft expression of MCP-1 and RANTES mRNA; absence of MCP-1/CCR2-mediated signaling led to enhanced intragraft expression of MCP-1, MIP-1alpha and MIP-1beta mRNA. These findings suggest that MCP-1 plays an important role in regulating macrophage and CD4 T cell infiltration to xenograft sites via the CCR2 signaling pathway. Additional treatment of xenografted CCR2-/- transplant recipients with anti-interleukin-(IL)-4 and anti-IL-5 mAbs further delayed xenograft rejection demonstrating the potential for combined antirejection strategies in facilitating pig islet xenotransplantation.
Collapse
MESH Headings
- Animals
- Antibodies, Monoclonal/pharmacology
- CD4-Positive T-Lymphocytes/immunology
- Chemokine CCL2/genetics
- Chemokine CCL2/immunology
- Chemokine CCL3
- Chemokine CCL4
- Chemokine CCL5/genetics
- Chemokine CCL5/immunology
- Chemokine CXCL10
- Chemokines/genetics
- Chemokines/immunology
- Chemokines, CXC/genetics
- Chemokines, CXC/immunology
- Gene Expression/immunology
- Graft Rejection/immunology
- Graft Survival/immunology
- Immunohistochemistry
- Interleukin-4/immunology
- Interleukin-5/immunology
- Islets of Langerhans Transplantation/immunology
- Macrophage Inflammatory Proteins/genetics
- Macrophage Inflammatory Proteins/immunology
- Male
- Mice
- Mice, Inbred C57BL
- Mice, Inbred CBA
- Mice, Knockout
- RNA, Messenger/analysis
- Receptors, CCR2
- Receptors, CCR5/genetics
- Receptors, CCR5/immunology
- Receptors, Chemokine/genetics
- Receptors, Chemokine/immunology
- Swine
- Transplantation, Heterologous/immunology
Collapse
Affiliation(s)
- Michelle F Solomon
- Division of Molecular Medicine, The John Curtin School of Medical Research, The Australian National University, Canberra, ACT, Australia
| | | | | | | |
Collapse
|
20
|
Scott BL, Wang Z, Marrone BL, Sauer NN. Potential binding modes of beryllium with the class II major histocompatibility complex HLA-DP: a combined theoretical and structural database study. J Inorg Biochem 2003; 94:5-13. [PMID: 12620668 DOI: 10.1016/s0162-0134(02)00628-1] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In an effort to understand the molecular basis of chronic beryllium disease (CBD), a study of the chemical relationship between beryllium, antigen, and the major histocompatibility complex II, HLA-DP, was undertaken. A homology model of the HLA-DP protein was developed. An analysis of the sequences of HLA-DPB1 and HLA-DPA1 alleles most common among CBD patients revealed several carboxylate rich regions in the peptide-binding cleft. These regions contain many hard Lewis base sites that may provide bonding opportunities for beryllium, a hard Lewis acid. Quantum chemistry calculations and structural database results support the presence of beryllium clusters, bridged by carboxylate, hydroxo, and/or oxo ligands, in the HLA-DP binding cleft. These results strongly suggest that beryllium clusters are an integral part of the antigen, and may even act solely as antigen. This work provides an initial model for thinking about beryllium interactions with proteins relevant to CBD and other metal-induced diseases.
Collapse
Affiliation(s)
- Brian L Scott
- Chemistry Division (C-SIC, Mail Stop J514), Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
| | | | | | | |
Collapse
|
21
|
Abstract
The recognition that CD8(+) T-cell mediated Th1 immune responses were necessary to produce immunity to intracellular and transformed self pathogens led to intense interest in the delivery of nucleic acids, DNA, or RNA encoding candidate antigens, as vaccines. Antigen presenting cells (APC) encounter most protein and vaccine immunogens as extracellular proteins and, thus, present them on major histocompatibility complex (MHC) class II molecules leading to the activation of CD4(+) T cells. Protein antigens encoded by nucleic acids delivered to dendritic cell (DC) are produced inside the cell and, thus, can stimulate MHC class I mediated activation of CD8(+) T-cell immune responses. Unfortunately, DCs are not readily transfected with DNA (Akbari et al., 1999) resulting in the requirement for high concentrations of DNA and repeated immunizations to achieved immune responses. RNA, on the other hand, is readily taken up and expressed by DC, making it an alternative vaccine candidate. In this article, we will discuss immune responses developed, interactions between APC and RNA that activate and dictate DC activation, and preliminary studies using RNA in vivo and in vitro to develop protective immunity.
Collapse
Affiliation(s)
- Georgetta Cannon
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | | |
Collapse
|
22
|
Dijkstra JM, Fischer U, Sawamoto Y, Ototake M, Nakanishi T. Exogenous antigens and the stimulation of MHC class I restricted cell-mediated cytotoxicity: possible strategies for fish vaccines. FISH & SHELLFISH IMMUNOLOGY 2001; 11:437-458. [PMID: 11556476 DOI: 10.1006/fsim.2001.0351] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
An MHC class I restricted cytotoxic T lymphocyte (CTL) activity assay has recently been established for rainbow trout. MHC class I restricted cytotoxicity probably plays a critical role in immunity to most viral diseases in mammals and may play a similar role in fish. Therefore, it is very important to investigate what types of vaccines can stimulate this immune response. Although logical candidates for vaccine components that can stimulate an MHC class I restricted response are live attenuated viruses and DNA vaccines, these materials are generally not allowed in fish for commercial vaccine use due to potential safety issues. In mammals, however, a number of interesting vaccination strategies based on exogenous antigens that stimulate MHC class I restricted cytotoxicity have been described. Several of these strategies are discussed in this review in the context of fish vaccination.
Collapse
Affiliation(s)
- J M Dijkstra
- Immunology Section, National Research Institute of Aquaculture, Tamaki, Mie, Japan
| | | | | | | | | |
Collapse
|
23
|
Hegde NR, Srikumaran S. Reverse immunogenetic and polyepitopic approaches for the induction of cell-mediated immunity against bovine viral pathogens. Anim Health Res Rev 2000; 1:103-18. [PMID: 11708596 DOI: 10.1017/s1466252300000098] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The control of several infectious diseases of animals by vaccination is perhaps the most outstanding accomplishment of veterinary medicine in the last century. Even the eradication of some pathogens is in sight, at least in some parts of the world. However, infectious diseases continue to cost millions of dollars to the livestock industry. One of the reasons for the failure to control certain pathogens is the limited emphasis placed on cell-mediated immunity (CMI) in the design of vaccines against these pathogens. Traditionally, vaccine-induced immunity has been studied in relation to antibody-mediated protection. More recent studies, however, have focused on understanding CMI and developing means of inducing CMI. This review focuses on recent advances made in the study of CMI in general and of cytotoxic T lymphocytes in particular. Parallels from studies in human and mouse immunology are drawn in order to point out implications to bovine immunology, specifically for immunity against bovine herpesvirus 1.
Collapse
Affiliation(s)
- N R Hegde
- Department of Molecular Microbiology and Immunology, Oregon Health Sciences University, Portland 97201-3098, USA
| | | |
Collapse
|
24
|
Yellin MJ, Thienel U. T cells in the pathogenesis of systemic lupus erythematosus: potential roles of CD154-CD40 interactions and costimulatory molecules. Curr Rheumatol Rep 2000; 2:24-31. [PMID: 11123036 DOI: 10.1007/s11926-996-0065-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
CD154 is an activation-induced CD4+ T cell surface molecule that interacts with CD40 on antigen-presenting cells (APC) and upregulates the key costimulatory molecules, CD80 and CD86. Bidirectional intercellular signaling mediated by CD40 ligation and CD80/CD86 interactions with counter-receptors on T cells play central roles in regulating the survival and outgrowth of pathogenic autoreactive T cells and B cells in systemic lupus erythematosus (SLE). CD40 is also expressed on a variety of other cells, including endothelial cells and renal tubule epithelial cells. CD154 activation of APCs, endothelial cells, and renal tubular epithelial cells have proinflammatory or procoagulant effects that may contribute to the pathogenesis of lupus. This review will focus on the immunobiology of CD154-CD40 interactions and the costimulatory functions of CD80 and CD86. The experimental evidence suggesting roles for these molecules in the immunopathogenesis of SLE will be reviewed.
Collapse
|
25
|
Ong PY, Hirsch AT. Are atopic individuals genetically predisposed to produce a specific protease profile in antigen processing? Med Hypotheses 1999; 53:19-21. [PMID: 10499819 DOI: 10.1054/mehy.1997.0700] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Genetic factors play a major role in the development of allergic diseases such as asthma and atopic dermatitis. Since allergic response involves immune processes such as antigen-processing and -presentation, it is conceivable that the genes involved in the regulation of these processes may be crucial in determining an individual's susceptibility to allergic diseases. In this paper, it is proposed that proteases, used in antigen-processing, are involved in the genetic predisposition to allergic diseases.
Collapse
Affiliation(s)
- P Y Ong
- White Memorial Medical Center, Los Angeles, CA, USA
| | | |
Collapse
|
26
|
Sastry S, Linderoth N. Molecular mechanisms of peptide loading by the tumor rejection antigen/heat shock chaperone gp96 (GRP94). J Biol Chem 1999; 274:12023-35. [PMID: 10207025 DOI: 10.1074/jbc.274.17.12023] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Complexes of gp96/GRP94 and peptides have been shown to elicit immunogenicity. We used fluorescence to understand peptide association with gp96. A pyrene-peptide conjugate was complexed with gp96 under a variety of conditions. At room temperature in low salt (20 mM NaCl), the peptide binds gp96 with a strong affinity (approximately 100-150 nM) and forms pyrene excimers, suggesting that the peptides were assembled as dimers. In high salt (2.2 M NaCl), although peptide binding was stronger (Ka approximately 55 nM) than in low salt, pyrene excimers were absent, implying that peptides were farther apart in the complex. Heat shock-activated peptide binding exhibited characteristics of both low salt and high salt modes of binding. Anisotropy and average lifetime of the bound pyrene suggested that peptides were probably located in a solvent-accessible hydrophobic binding pocket in low salt, whereas in high salt, the peptide may be buried in a less hydrophobic (more hydrophilic) environment. These results suggested that peptide-gp96 complexes were assembled in several different ways, depending on the assembly conditions. Resonance energy transfer between the intrinsic tryptophan(s) in gp96 and pyrene suggested that one or more tryptophan residues were within the critical Forster distance of 27-30 A from the pyrene in the bound peptide. It is proposed that peptides are assembled within higher order gp96 complexes (dimers, etc.) in a hydrophobic pocket and that there may be a conformational change in gp96 leading to an open configuration for peptide loading.
Collapse
Affiliation(s)
- S Sastry
- Laboratory of Molecular Genetics, The Rockefeller University, New York, New York 10021, USA.
| | | |
Collapse
|
27
|
Affiliation(s)
- C J Simeonovic
- Division of Molecular Medicine, The John Curtin School of Medical Research, The Australian National University, Canberra, ACT, Australia
| |
Collapse
|
28
|
Abstract
OBJECTIVE Transgenic and knockout technologies have emerged from the "molecular biology revolution" as unprecedented techniques for manipulating gene function in intact mice. The goals of this review are to outline the techniques of creating transgenic and knockout mice, and to demonstrate their use in elucidation of the molecular mechanisms underlying common surgical diseases. SUMMARY BACKGROUND DATA Gain of gene function is created by transgenic technology, whereas gene function is ablated using gene knockouts. Each technique has distinctive applications and drawbacks. A unique feature of genetically manipulated mice is that combinatorial genetic experiments can be executed that precisely define the functional contribution of a gene to disease progression. Transgenic and knockout mouse models of wound healing, cardiovascular disease, transplant immunology, gut motility and inflammatory bowel disease, and oncology are beginning to illuminate the precise molecular regulation of these diseases. Transgenic technology has also been extended to larger mammals such as pigs, with the goal of using genetic manipulation of the xenogenic immune response to increase the availability of transplant organs. Continual refinements in gene manipulation technology in mice offer the opportunity to turn genes on or off at precise time intervals and in particular tissues, according to the needs of the investigator. Ultimately, investigation of disease development and progression in genetically manipulated mammals may delineate new molecular targets for drug discovery and provide novel platforms for drug efficacy screens. CONCLUSIONS Emulation of human disease and therapy using genetically manipulated mammals fulfills a promise of molecular medicine: fusion of molecular biochemistry with "classical" biology and physiology. Surgeons have unique skills spanning both worlds that can facilitate their success in this expanding arena.
Collapse
Affiliation(s)
- J M Arbeit
- Department of Surgery and the Cancer Center, University of California at San Francisco/Mt. Zion Medical Center, 94143-1674, USA
| | | |
Collapse
|
29
|
Abstract
H2-M (HLA-DM in humans) resides in an acidic endosomal compartment, where it facilitates the loading of antigenic peptides into the peptide-binding groove of class II MHC. The crystal structure of a soluble form of H2-M has been solved to 3.1 A resolution, revealing a heterodimer with structural similarities to the MHC family of proteins. In contrast to its antigen-presenting cousins, the membrane distal alpha helices of H2-M pack closely together, occluding most of the binding groove except for a single large pocket near the center. The structure of H2-M has several unique features that may play a role in its function as a molecular chaperone and peptide exchange factor.
Collapse
Affiliation(s)
- D H Fremont
- Center for Immunology, Department of Pathology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
| | | | | | | | | |
Collapse
|
30
|
Gautam AM, Liblau R, Chelvanayagam G, Steinman L, Boston T. A Viral Peptide with Limited Homology to a Self Peptide Can Induce Clinical Signs of Experimental Autoimmune Encephalomyelitis. THE JOURNAL OF IMMUNOLOGY 1998. [DOI: 10.4049/jimmunol.161.1.60] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Molecular mimicry has been suggested as a mode of autoreactive T cell stimulation in autoimmune diseases. Myelin basic protein (MBP) peptide 1–11 induces experimental autoimmune encephalomyelitis (EAE) in susceptible strains of mice. Here we show that a herpesvirus Saimiri (HVS) peptide, AAQRRPSRPFA, with a limited homology to MBP1–11 peptide, ASQKRPSQRHG (underlined letters showing homology), can stimulate a panel of MBP1–11-specific T cell hybridomas and more importantly cause EAE in mice. We demonstrate that this is due to cross-recognition of these two peptides by TCRs. Results presented in this communication are the first demonstration that a viral peptide with homology at just 5 amino acids with a self peptide can induce clinical signs of EAE in mice. These findings have important implications in understanding the breakdown of T cell tolerance to self Ags in autoimmune diseases by means of cross-reactivity with unrelated peptides.
Collapse
Affiliation(s)
- Anand M. Gautam
- *Antigen Presentation Laboratory, Division of Immunology and Cell Biology and Human Genetics Group, Division of Molecular Medicine, John Curtin School of Medical Research, Australian National University, Canberra, Australia; and
| | | | | | - Lawrence Steinman
- §Institut National de la Santé et de la Recherche Médicale, CJF 9608, Pitie-Salpetriere Hospital, Paris, France
| | - Tanya Boston
- *Antigen Presentation Laboratory, Division of Immunology and Cell Biology and Human Genetics Group, Division of Molecular Medicine, John Curtin School of Medical Research, Australian National University, Canberra, Australia; and
| |
Collapse
|
31
|
Stubbs MT, Renatus M, Bode W. An active zymogen: unravelling the mystery of tissue-type plasminogen activator. Biol Chem 1998; 379:95-103. [PMID: 9524060 DOI: 10.1515/bchm.1998.379.2.95] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
In contrast to almost all other proteinases, human tissue-type plasminogen activator (tPA) is also proteolytically active in its zymogen or single-chain form. The closely related plasminogen activator isolated from vampire bat saliva (vPA) acts exclusively in the single-chain form, lacking the requisite cleavage site for proteolytic activation. Recent structural studies on the proteolytic domains of vPA and human tPA in two- and single-chain forms reveal the mechanism of this anomalous activity. The PA-catalyzed proteolytic conversion of plasminogen to plasmin, responsible for the initiation of fibrinolysis, is fibrin-dependent; comparative structural analysis of the plasminogen activators provides clues as to the role of fibrin as cofactor.
Collapse
Affiliation(s)
- M T Stubbs
- Institut für Pharmazeutische Chemie der Philipps-Universität Marburg, Germany
| | | | | |
Collapse
|