1
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Lazarević M, Stanisavljević S, Nikolovski N, Dimitrijević M, Miljković Đ. Complete Freund's adjuvant as a confounding factor in multiple sclerosis research. Front Immunol 2024; 15:1353865. [PMID: 38426111 PMCID: PMC10902151 DOI: 10.3389/fimmu.2024.1353865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Accepted: 01/29/2024] [Indexed: 03/02/2024] Open
Abstract
Complete Freund's adjuvant (CFA) is used as a standard adjuvant for the induction of experimental autoimmune encephalomyelitis (EAE), the most commonly used animal model in multiple sclerosis studies. Still, CFA induces glial activation and neuroinflammation on its own and provokes pain. In addition, as CFA contains Mycobacteria, an immune response against bacterial antigens is induced in parallel to the response against central nervous system antigens. Thus, CFA can be considered as a confounding factor in multiple sclerosis-related studies performed on EAE. Here, we discuss the effects of CFA in EAE in detail and present EAE variants induced in experimental animals without the use of CFA. We put forward CFA-free EAE variants as valuable tools for studying multiple sclerosis pathogenesis and therapeutic approaches.
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Affiliation(s)
| | | | | | | | - Đorđe Miljković
- Department of Immunology, Institute for Biological Research “Siniša Stanković” - National Institute of Republic of Serbia, University of Belgrade, Belgrade, Serbia
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2
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McCombe PA, Hardy TA, Nona RJ, Greer JM. Sex differences in Guillain Barré syndrome, chronic inflammatory demyelinating polyradiculoneuropathy and experimental autoimmune neuritis. Front Immunol 2022; 13:1038411. [PMID: 36569912 PMCID: PMC9780466 DOI: 10.3389/fimmu.2022.1038411] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 11/24/2022] [Indexed: 12/13/2022] Open
Abstract
Guillain Barré syndrome (GBS) and its variants, and chronic inflammatory demyelinating polyradiculoneuropathy (CIDP and its variants, are regarded as immune mediated neuropathies. Unlike in many autoimmune disorders, GBS and CIDP are more common in males than females. Sex is not a clear predictor of outcome. Experimental autoimmune neuritis (EAN) is an animal model of these diseases, but there are no studies of the effects of sex in EAN. The pathogenesis of GBS and CIDP involves immune response to non-protein antigens, antigen presentation through non-conventional T cells and, in CIDP with nodopathy, IgG4 antibody responses to antigens. There are some reported sex differences in some of these elements of the immune system and we speculate that these sex differences could contribute to the male predominance of these diseases, and suggest that sex differences in peripheral nerves is a topic worthy of further study.
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Affiliation(s)
- Pamela A. McCombe
- Centre for Clinical Research, The University of Queensland, Brisbane, QLD, Australia,*Correspondence: Pamela A. McCombe,
| | - Todd A. Hardy
- Department of Neurology, Concord Hospital, University of Sydney, Sydney, NSW, Australia,Brain & Mind Centre, University of Sydney, Sydney, NSW, Australia
| | - Robert J. Nona
- Centre for Clinical Research, The University of Queensland, Brisbane, QLD, Australia
| | - Judith M. Greer
- Centre for Clinical Research, The University of Queensland, Brisbane, QLD, Australia
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3
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Yin J, Zheng J, Deng F, Zhao W, Chen Y, Huang Q, Huang R, Wen L, Yue X, Petersen F, Yu X. Gene Expression Profiling of Lacrimal Glands Identifies the Ectopic Expression of MHC II on Glandular Cells as a Presymptomatic Feature in a Mouse Model of Primary Sjögren's Syndrome. Front Immunol 2018; 9:2362. [PMID: 30429844 PMCID: PMC6220427 DOI: 10.3389/fimmu.2018.02362] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Accepted: 09/24/2018] [Indexed: 11/13/2022] Open
Abstract
Ectopic expression of MHC II molecules on glandular cells is a feature of primary Sjögren's syndrome (pSS). However, the cause of this ectopic expression and its potential role in the pathogenesis of the disease remains elusive. Here, we report that ectopic expression of MHC II molecules on glandular cells represents an early presymptomatic event in a mouse model of pSS induced by immunization of Ro60_316-335 peptide emulsified in TiterMax® as an adjuvant. Ectopic expression of MHC II was induced by TiterMax® but not by complete freund's adjuvant (CFA). Furthermore, immunization with Ro60_316-335 peptide emulsified in TiterMax®, but not in CFA, induced a pSS-like disease in mice. Our results suggests that ectopic expression of MHC II molecules on glandular cells represents a presymptomatic feature of pSS and that such ectopic expression can be induced by exogenous factors. In addition, this study also provides a novel mechanism how adjuvants can amplify immune responses.
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Affiliation(s)
- Junping Yin
- Xiamen-Borstel Joint Laboratory of Autoimmunity, The Medical College of Xiamen University, Xiamen, China
| | - Junfeng Zheng
- Institute of Psychiatry and Neuroscience, Xinxiang Medical University, Xinxiang, China
| | - Fengyuan Deng
- Xiamen-Borstel Joint Laboratory of Autoimmunity, The Medical College of Xiamen University, Xiamen, China
| | - Wenjie Zhao
- Xiamen-Borstel Joint Laboratory of Autoimmunity, The Medical College of Xiamen University, Xiamen, China
| | - Yan Chen
- Institute of Psychiatry and Neuroscience, Xinxiang Medical University, Xinxiang, China
| | - Qiaoniang Huang
- Xiamen-Borstel Joint Laboratory of Autoimmunity, The Medical College of Xiamen University, Xiamen, China
| | - Renliang Huang
- Xiamen-Borstel Joint Laboratory of Autoimmunity, The Medical College of Xiamen University, Xiamen, China
| | - Lifang Wen
- Xiamen-Borstel Joint Laboratory of Autoimmunity, The Medical College of Xiamen University, Xiamen, China
| | - Xiaoyang Yue
- Priority Area Asthma & Allergy, Research Center Borstel, Airway Research Center North (ARCN), Members of the German Center for Lung Research (DZL), Borstel, Germany
| | - Frank Petersen
- Priority Area Asthma & Allergy, Research Center Borstel, Airway Research Center North (ARCN), Members of the German Center for Lung Research (DZL), Borstel, Germany
| | - Xinhua Yu
- Xiamen-Borstel Joint Laboratory of Autoimmunity, The Medical College of Xiamen University, Xiamen, China.,Priority Area Asthma & Allergy, Research Center Borstel, Airway Research Center North (ARCN), Members of the German Center for Lung Research (DZL), Borstel, Germany
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4
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Bjelobaba I, Begovic-Kupresanin V, Pekovic S, Lavrnja I. Animal models of multiple sclerosis: Focus on experimental autoimmune encephalomyelitis. J Neurosci Res 2018; 96:1021-1042. [PMID: 29446144 DOI: 10.1002/jnr.24224] [Citation(s) in RCA: 103] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Revised: 01/15/2018] [Accepted: 01/25/2018] [Indexed: 12/15/2022]
Abstract
Multiple sclerosis (MS) is a chronic, progressive disorder of the central nervous system (CNS) that affects more than two million people worldwide. Several animal models resemble MS pathology; the most employed are experimental autoimmune encephalomyelitis (EAE) and toxin- and/or virus-induced demyelination. In this review we will summarize our knowledge on the utility of different animal models in MS research. Although animal models cannot replicate the complexity and heterogeneity of the MS pathology, they have proved to be useful for the development of several drugs approved for treatment of MS patients. This review focuses on EAE because it represents both clinical and pathological features of MS. During the past decades, EAE has been effective in illuminating various pathological processes that occur during MS, including inflammation, CNS penetration, demyelination, axonopathy, and neuron loss mediated by immune cells.
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Affiliation(s)
- Ivana Bjelobaba
- Institute for Biological Research "Sinisa Stankovic," Department of Neurobiology, University of Belgrade, Belgrade, Serbia
| | | | - Sanja Pekovic
- Institute for Biological Research "Sinisa Stankovic," Department of Neurobiology, University of Belgrade, Belgrade, Serbia
| | - Irena Lavrnja
- Institute for Biological Research "Sinisa Stankovic," Department of Neurobiology, University of Belgrade, Belgrade, Serbia
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5
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Mirkov I, Popov Aleksandrov A, Ninkov M, Mileusnic D, Demenesku J, Zolotarevski L, Subota V, Stefik D, Kataranovski D, Kataranovski M. Strain differences in intestinal toxicity of warfarin in rats. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2016; 48:175-182. [PMID: 27816002 DOI: 10.1016/j.etap.2016.10.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 10/18/2016] [Accepted: 10/21/2016] [Indexed: 06/06/2023]
Abstract
Intestinal hemorrhage characterizes effectiveness of warfarin (WF) as rodenticide and is among adverse effects of therapy in humans. Having in mind genetic variations in the effectiveness of WF in wild rats and in the doses required for therapeutic effect, strain differences in the intestinal toxicity of oral warfarin in rats were examined in this study. High WF dose (3.5mg/l) led to mortality in Albino Oxford (AO) rats, with no lethality in Dark Agouti (DA) rats. Higher values of prothrombin time were noted at low WF dose (0.35mg/l) in the former strain. Leukocyte infiltration in intestine noted at this dose in both strains was associated with oxidative injury and more pronounced anti-oxidative response in AO rats. Suppression of mesenteric lymph node cell proliferation and IFN-γ and IL-10 production in AO rats and lack of these effects in DA rats, represent different strategies to protect vulnerable intestine from harmful immune responses.
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Affiliation(s)
- Ivana Mirkov
- Immunotoxicology group, Department of Ecology, Institute for Biological Research "Sinisa Stankovic", University of Belgrade, 142 Bulevar despota Stefana, 11000 Belgrade, Serbia
| | - Aleksandra Popov Aleksandrov
- Immunotoxicology group, Department of Ecology, Institute for Biological Research "Sinisa Stankovic", University of Belgrade, 142 Bulevar despota Stefana, 11000 Belgrade, Serbia
| | - Marina Ninkov
- Immunotoxicology group, Department of Ecology, Institute for Biological Research "Sinisa Stankovic", University of Belgrade, 142 Bulevar despota Stefana, 11000 Belgrade, Serbia
| | - Dina Mileusnic
- Immunotoxicology group, Department of Ecology, Institute for Biological Research "Sinisa Stankovic", University of Belgrade, 142 Bulevar despota Stefana, 11000 Belgrade, Serbia
| | - Jelena Demenesku
- Immunotoxicology group, Department of Ecology, Institute for Biological Research "Sinisa Stankovic", University of Belgrade, 142 Bulevar despota Stefana, 11000 Belgrade, Serbia
| | - Lidija Zolotarevski
- Institute for Pathology, Military Medical Academy, 17 Crnotravska, 11000 Belgrade, Serbia
| | - Vesna Subota
- Institute for Medical Biochemistry, Military Medical Academy, 17 Crnotravska, 11000 Belgrade, Serbia
| | - Debora Stefik
- Immunotoxicology group, Department of Ecology, Institute for Biological Research "Sinisa Stankovic", University of Belgrade, 142 Bulevar despota Stefana, 11000 Belgrade, Serbia
| | - Dragan Kataranovski
- Immunotoxicology group, Department of Ecology, Institute for Biological Research "Sinisa Stankovic", University of Belgrade, 142 Bulevar despota Stefana, 11000 Belgrade, Serbia; Institute of Zoology, Faculty of Biology, University of Belgrade,16 Studentski trg, 11000 Belgrade, Serbia
| | - Milena Kataranovski
- Immunotoxicology group, Department of Ecology, Institute for Biological Research "Sinisa Stankovic", University of Belgrade, 142 Bulevar despota Stefana, 11000 Belgrade, Serbia; Institute of Physiology and Biochemistry, Faculty of Biology, University of Belgrade, 16 Studentski trg, 11000 Belgrade, Serbia.
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6
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Ninkov M, Popov Aleksandrov A, Mirkov I, Demenesku J, Mileusnic D, Jovanovic Stojanov S, Golic N, Tolinacki M, Zolotarevski L, Kataranovski D, Brceski I, Kataranovski M. Strain differences in toxicity of oral cadmium intake in rats. Food Chem Toxicol 2016; 96:11-23. [DOI: 10.1016/j.fct.2016.07.021] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Revised: 06/20/2016] [Accepted: 07/20/2016] [Indexed: 11/26/2022]
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7
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Blaževski J, Petković F, Momčilović M, Jevtić B, Mostarica Stojković M, Miljković D. Tumor necrosis factor stimulates expression of CXCL12 in astrocytes. Immunobiology 2015; 220:845-50. [PMID: 25662914 DOI: 10.1016/j.imbio.2015.01.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Revised: 01/13/2015] [Accepted: 01/14/2015] [Indexed: 01/01/2023]
Abstract
It has been increasingly appreciated that tumor necrosis factor (TNF) performs various protective and anti-inflammatory functions in multiple sclerosis (MS) and its animal model experimental autoimmune encephalomyelitis (EAE). Recently, CXCL12 has been identified as a key inhibitor of leukocyte entry into the central nervous system (CNS) and as a regulator of inflammation resulting from the invasion. Here, a positive correlation between expression of TNF and CXCL12 in the CNS samples of EAE rats is presented. Also, it is shown that TNF potentiates CXCL12 expression in astrocytes. These results contribute to a view that TNF produced within the CNS plays a protective role in neuroinflammation.
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Affiliation(s)
- Jana Blaževski
- Department of Immunology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Serbia
| | - Filip Petković
- Department of Immunology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Serbia
| | - Miljana Momčilović
- Department of Immunology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Serbia
| | - Bojan Jevtić
- Department of Immunology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Serbia
| | | | - Djordje Miljković
- Department of Immunology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Serbia.
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8
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Popov Aleksandrov A, Mirkov I, Demenesku J, Ninkov M, Zolotarevski L, Kataranovski D, Kataranovski M. Strain differences in contact hypersensitivity reaction to dinitrochlorobenzene (DNCB) in rats. Food Chem Toxicol 2015; 75:94-103. [DOI: 10.1016/j.fct.2014.11.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Revised: 11/06/2014] [Accepted: 11/11/2014] [Indexed: 11/28/2022]
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9
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Ringheim GE, Lee L, Laws-Ricker L, Delohery T, Liu L, Zhang D, Colletti N, Soos TJ, Schroeder K, Fanelli B, Tian N, Arendt CW, Iglesias-Bregna D, Petty M, Ji Z, Qian G, Gaur R, Weinstock D, Cavallo J, Telsinskas J, McMonagle-Strucko K. Teriflunomide attenuates immunopathological changes in the dark agouti rat model of experimental autoimmune encephalomyelitis. Front Neurol 2013; 4:169. [PMID: 24198809 PMCID: PMC3812666 DOI: 10.3389/fneur.2013.00169] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2013] [Accepted: 10/16/2013] [Indexed: 01/13/2023] Open
Abstract
Teriflunomide is an oral disease-modifying therapy recently approved in several locations for relapsing-remitting multiple sclerosis. To gain insight into the effects of teriflunomide, immunocyte population changes were measured during progression of experimental autoimmune encephalomyelitis in Dark Agouti rats. Treatment with teriflunomide attenuated levels of spinal cord-infiltrating T cells, natural killer cells, macrophages, and neutrophils. Teriflunomide also mitigated the disease-induced changes in immune cell populations in the blood and spleen suggesting an inhibitory effect on pathogenic immune responses.
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Affiliation(s)
- Garth E Ringheim
- Inflammation and Immunology Translational Development, Celgene Corporation , Summit, NJ , USA
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10
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Blaževski J, Petković F, Momčilović M, Jevtic B, Miljković D, Mostarica Stojković M. High interleukin-10 expression within the central nervous system may be important for initiation of recovery of Dark Agouti rats from experimental autoimmune encephalomyelitis. Immunobiology 2013; 218:1192-9. [PMID: 23664544 DOI: 10.1016/j.imbio.2013.04.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Revised: 04/03/2013] [Accepted: 04/07/2013] [Indexed: 10/27/2022]
Abstract
Dark Agouti (DA) rats are highly susceptible to induction of experimental autoimmune encephalomyelitis (EAE), still they completely recover from the disease. Here, we were interested to determine contribution of major anti-inflammatory cytokines transforming growth factor (TGF)-β and interleukin (IL)-10 to the recovery of DA rats from EAE. To that extent we determined CNS expression of these cytokines in DA rats at different phases of EAE and compared data to those obtained in EAE-resistant Albino Oxford (AO) rats. Higher expression of TGF-β was persistently observed in the CNS of AO rats, even if rats were not immunized. This implied that high TGF-β within the CNS is important for resistance of AO rats to EAE induction. On the contrary, IL-10 expression was consistently higher in DA than in AO rats and it culminated at the peak of EAE. Methylprednisolone suppressed EAE and expression of IL-10 in spinal cord homogenates, while IL-10 was increased in CNS-infiltrating immune cells. This implied that IL-10 might have a significant role in recovery of DA rats from the disease. Thus, we next explored effects of IL-10 on astrocytes, glial cells that largely contribute to control of CNS inflammation. IL-10 stimulated astrocytic expression of an important regulator of neuroinflammation, CXCL12. Thus, IL-10 might contribute to recovery of DA rats from EAE through induction of CXCL12 expression in astrocytes.
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Affiliation(s)
- Jana Blaževski
- Department of Immunology, Institute for Biological Research, Siniša Stanković, University of Belgrade, Serbia
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11
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End-point effector stress mediators in neuroimmune interactions: their role in immune system homeostasis and autoimmune pathology. Immunol Res 2012; 52:64-80. [PMID: 22396175 DOI: 10.1007/s12026-012-8275-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Much evidence has identified a direct anatomical and functional link between the brain and the immune system, with glucocorticoids (GCs), catecholamines (CAs), and neuropeptide Y (NPY) as its end-point mediators. This suggests the important role of these mediators in immune system homeostasis and the pathogenesis of inflammatory autoimmune diseases. However, although it is clear that these mediators can modulate lymphocyte maturation and the activity of distinct immune cell types, their putative role in the pathogenesis of autoimmune disease is not yet completely understood. We have contributed to this field by discovering the influence of CAs and GCs on fine-tuning thymocyte negative selection and, in particular, by pointing to the putative CA-mediated mechanisms underlying this influence. Furthermore, we have shown that CAs are implicated in the regulation of regulatory T-cell development in the thymus. Moreover, our investigations related to macrophage biology emphasize the complex interaction between GCs, CAs and NPY in the modulation of macrophage functions and their putative significance for the pathogenesis of autoimmune inflammatory diseases.
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12
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13
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CXCL12 expression within the CNS contributes to the resistance against experimental autoimmune encephalomyelitis in Albino Oxford rats. Immunobiology 2011; 216:979-87. [DOI: 10.1016/j.imbio.2011.03.013] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2010] [Revised: 03/09/2011] [Accepted: 03/30/2011] [Indexed: 01/08/2023]
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14
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Phenotype changes induced by immunization with encephalitogen affected the functions of peritoneal macrophages in two rat strains with different sensitivity to experimental autoimmune encephalomyelitis (EAE) induction. ACTA VET-BEOGRAD 2010. [DOI: 10.2298/avb1003105m] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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15
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Miljkovic D, Stosic-Grujicic S, Markovic M, Momcilovic M, Ramic Z, Maksimovic-Ivanic D, Mijatovic S, Popadic D, Cvetkovic I, Mostarica-Stojkovic M. Strain difference in susceptibility to experimental autoimmune encephalomyelitis between Albino Oxford and Dark Agouti rats correlates with disparity in production of IL-17, but not nitric oxide. J Neurosci Res 2006; 84:379-88. [PMID: 16676327 DOI: 10.1002/jnr.20883] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Albino Oxford (AO) rats, unlike Dark Agouti (DA) rats are resistant to the induction of experimental autoimmune encephalomyelitis (EAE). The reason for the resistance could be some restraining mechanism preventing auto-aggressive cell activation at the level of draining lymph nodes (DLN) during the induction phase of the disease. Such a mechanism could be anti-proliferative action of nitric oxide (NO), which has already been shown of importance for the resistance of several rat strains to the induction of the disease. Importantly, number of AO DLN cells (DLNC) is markedly lower and with lower proliferative response to myelin basic protein (MBP) ex vivo in comparison to DA DLNC in the inductive phase of EAE, thus implying that in AO rats DLNC do not proliferate as extensively as in DA rats. We show that AO rats do not produce larger quantities of NO than DA rats after immunization. Further, DLNC of immunized AO rats have significantly lower mRNA expression and synthesis of interferon (IFN)-gamma and interleukin (IL)-17 compared to DLNC of DA rats. Collectively, these results suggest that there is a substantial difference between EAE-resistant AO rats and EAE-prone DA rats in the initiation of autoimmune response. This difference seems to be independent of anti-proliferative actions of NO, but correlates with impaired IL-17 production in AO rats.
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Affiliation(s)
- Djordje Miljkovic
- Institute for Biological Research Sinisa Stankovic, Belgrade, Serbia.
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16
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Stanojević S, Mitić K, Vujić V, Kovacević-Jovanović V, Dimitrijević M. Beta-endorphin differentially affects inflammation in two inbred rat strains. Eur J Pharmacol 2006; 549:157-65. [PMID: 16978600 DOI: 10.1016/j.ejphar.2006.08.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2006] [Revised: 06/29/2006] [Accepted: 08/04/2006] [Indexed: 10/24/2022]
Abstract
It has been shown that inflammation of rat paws elicits accumulation of opioid peptide beta-endorphin-containing immune cells in the inflamed subcutaneous tissue, contributing to immunocyte-produced pain suppression. However, the possible mechanisms involved in the pharmacological application of beta-endorphin in rat paw inflammation have not been investigated. The present study was set up to explore the effects of intraplantar injection of beta-endorphin on Concanavalin A-induced paw edema in two inbred rat strains, Albino Oxford (AO) and Dark Agouti (DA). Both high dose-induced suppression and low dose-induced potentiation of edema development in AO and DA rats, respectively, were blocked with antagonists specific for delta (naltrindole) and kappa (nor-binaltorphimine) opioid receptors. beta-endorphin in vitro decreased phagocytosis and increased nitric oxide (NO) production in air pouch granulocytes obtained from AO rats. However, in cells from DA rat strain beta-endorphin modulated both phagocytosis and NO production in a concentration-dependent manner. It could be concluded that the strain-dependent opposing effects of beta-endorphin on paw inflammation are mediated through delta and kappa opioid receptors and probably involve changes in the production of reactive oxygen species by inflammatory cells. Our results point to the importance of genotype for pharmacological manipulations and the development of inflammation.
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MESH Headings
- Animals
- Concanavalin A/toxicity
- Dose-Response Relationship, Drug
- Edema/chemically induced
- Edema/physiopathology
- Edema/prevention & control
- Female
- Granulocytes/cytology
- Granulocytes/drug effects
- Granulocytes/metabolism
- Hindlimb/drug effects
- Hindlimb/pathology
- Hindlimb/physiopathology
- Inflammation/chemically induced
- Inflammation/physiopathology
- Inflammation/prevention & control
- Male
- Naltrexone/analogs & derivatives
- Naltrexone/pharmacology
- Narcotic Antagonists/pharmacology
- Neurotransmitter Agents/pharmacology
- Nitric Oxide/metabolism
- Phagocytosis/drug effects
- Rats
- Rats, Inbred Strains
- Receptors, Opioid, delta/antagonists & inhibitors
- Receptors, Opioid, delta/physiology
- Receptors, Opioid, kappa/antagonists & inhibitors
- Receptors, Opioid, kappa/physiology
- Species Specificity
- beta-Endorphin/pharmacology
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Affiliation(s)
- Stanislava Stanojević
- Immunology Research Center Branislav Janković, Institute of Immunology and Virology Torlak, Vojvode Stepe 458, 11152 Belgrade, Serbia and Montenegro.
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17
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Jung S, Gaupp S, Korn T, Köllner G, Hartung HP, Toyka KV. Biphasic form of experimental autoimmune neuritis in dark Agouti rats and its oral therapy by antigen-specific tolerization. J Neurosci Res 2004; 75:524-35. [PMID: 14743436 DOI: 10.1002/jnr.10879] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A new and biphasic form of experimental autoimmune neuritis (EAN) is described in dark agouti rats (DA rats) and is inducible by a single immunization with bovine peripheral nerve myelin (BPM) in complete Freund's adjuvant (DA-EAN). Animals develop a mild episode of disease; after recovery, 66-100% of the rats suffer from a more severe bout of EAN with paraparesis 25-30 days after immunization. By histology, DA-EAN is an inflammatory and demyelinating polyradiculoneuropathy virtually without axonal damage. Demyelination affects mainly spinal roots. This is also reflected by markedly increased F-wave latencies in nerve conduction studies of sciatic nerves. In sciatic nerves, inflammation and demyelination are found only focally and may be the histopathologic basis for conduction failure in some fibers. Immunologic investigations revealed stronger proliferative responses of DA than of Lewis rat lymph node cells to BPM and various peptides derived from the P2 protein. Proliferative and Th1-cytokine responses were particularly pronounced in spleen during the late phase of DA-EAN as compared to the monophasic EAN of Lewis rats. The data suggest that persistent lymphocyte proliferation with secretion of interferon (IFN)-gamma may be relevant for the relapsing course of DA-EAN whereas epitope spreading may explain the increased severity of the second bout of disease. The extended Th1 response in DA rats did not go along with a lack of downregulatory mechanisms, because the second DA-EAN attack was self-limited and splenocytes from DA rats produced considerable amounts of interleukin (IL)-10 and transforming growth factor (TGF)-beta. To substantiate further a functional immunoregulation in DA rats, we modulated DA-EAN by antigen-specific oral tolerization, which is known to involve active suppressor mechanisms. Preventive feeding of BPM in combination with cholera toxin (CT) induced a long-lasting resistance to DA-EAN. Even therapeutic administration of BPM or BPM/CT after onset of signs of disease significantly mitigated the further course of disease and prevented development of paraparesis. Because DA-EAN is easily inducible and leads consistently to relapses in most rats, it can be used for studies of immune factors that determine a relapsing course of autoimmunity. Furthermore, DA-EAN may serve as a model for relapsing inflammatory demyelinating polyneuropathies such as chronic inflammatory demyelinating polyneuropathy (CIDP) and for treatment studies. Our findings on effective prevention and therapy of DA-EAN by oral application of myelin/CT corroborate this form of immunomodulation as a treatment strategy for cell-mediated processes in chronic inflammatory neuropathies.
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Affiliation(s)
- Stefan Jung
- Department of Neurology and Clinical Research Group for Multiple Sclerosis, Ludwig-Maximilians-Universität Würzburg, Würzburg, Germany
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Kahl KG, Zielasek J, Uttenthal LO, Rodrigo J, Toyka KV, Schmidt HHHW. Protective role of the cytokine-inducible isoform of nitric oxide synthase induction and nitrosative stress in experimental autoimmune encephalomyelitis of the DA rat. J Neurosci Res 2003; 73:198-205. [PMID: 12836162 DOI: 10.1002/jnr.10649] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The pathogenic role of nitric oxide (NO) in multiple sclerosis (MS) remains controversial. Some groups have reported a pathogenic role of NO in experimental autoimmune encephalomyelitis (EAE), an animal model of some aspects of MS, whereas we and others have found a disease-suppressive effect of NO in EAE. Because the previously used EAE models have a mainly monophasic inflammatory disease course, distinct from MS, we here studied EAE in the DA rat, which better models the demyelinating and relapsing disease course of human MS. The induction of EAE in DA rats led to 1) severe inflammatory infiltrates mainly in the lumbar spinal cord; 2) an up-regulation of the activity of the cytokine-inducible isoform of NO synthases (NOS-II); and 3) increased tissue protein tyrosine nitration, as indicated by peroxynitrite (ONOO(-)), as a marker of nitrosative stress. Sources of superoxide metabolism, i.e., NADPH oxidase, myeloperoxidase, and superoxide dismutase, remained unchanged. Early treatment of animals with aminoguanidine, a relatively selective inhibitor of NOS-II, lowered nitrotyrosine immunoreactivity but at the same time led to more severe disease and pronounced inflammatory infiltrates in the lumbar spinal cord. Our results suggest a rather protective role of NOS-II induction and nitrosative stress in EAE in DA rats and support the hypothesis of a disease-mitigating immunomodulatory role of NO in this animal model of MS.
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Affiliation(s)
- Kai G Kahl
- Department of Neurology, Julius-Maximilians-University, Würzburg, Germany
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