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ElMosbah DE, Khattab MS, AbuBakr HO, El Miniawy HMF. Histopathological, biochemical and molecular studies on a model of systemic autoimmune disease induced by sodium silicate in non-genetically prone rats. Chem Biol Interact 2023; 379:110510. [PMID: 37100362 DOI: 10.1016/j.cbi.2023.110510] [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: 12/22/2022] [Revised: 04/04/2023] [Accepted: 04/24/2023] [Indexed: 04/28/2023]
Abstract
Sodium silicate (Na2SiO3) is an inorganic silica salt used in many products. Few studies reported autoimmune diseases (AIDs) due to Na2SiO3 exposure. This study investigates the role of Na2SiO3 exposure by different routes and doses in AID development in rats. We assigned 40 female rats to four groups: G1 control group, G2 rats were subcutaneously injected with 5 mg Na2SiO3 suspension, and G3 and G4 rats were orally administered 5 mg and 7 mg Na2SiO3 suspension, respectively. Na2SiO3 was administered weekly for 20 weeks. Serum anti-nuclear antibodies (ANA) detection, histopathology of kidney, brain, lung, liver, and heart, oxidative stress biomarkers (MDA and GSH) in tissues, Matrix metalloproteinase activity in serum, TNF-α, and Bcl-2 expression in tissues were performed. ANA was significantly increased in silicate groups, especially G2. Creatinine was significantly increased in silicate groups. Histopathology revealed vasculitis and fibrinoid degeneration of blood vessels, a picture of immune-mediated glomerulonephritis in the kidneys, and chronic interstitial pneumonia with medial hypertrophy of pulmonary blood vessels. The activity of gelatinases (MMP-2 and MMP-9) and collagenase (MMP-13), which play role in inflammation, remodeling, and immune complex degradation, were significantly increased in the silicate-exposed groups. Bcl-2 was significantly decreased, indicating apoptosis. Therefore, oral administration and subcutaneous injection of Na2SiO3 induced immune-mediated glomerulonephritis with elevated ANA levels and overexpression of TNF-α in rats.
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Affiliation(s)
- Dina E ElMosbah
- Department of Pathology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt.
| | - Marwa S Khattab
- Department of Pathology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
| | - Huda O AbuBakr
- Department of Biochemistry and Molecular Biology, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt
| | - Hala M F El Miniawy
- Department of Pathology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
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Mohammed MM, Okasha AMM, Naiem AHA, Mohamed RF, Abdelwahab SF, Mohamed HA. Cyclosporine Ameliorates Silica-Induced Autoimmune Hepatitis in Rat Model by Altering the Expression of Toll-Like Receptor-4, Interleukin-2, and Tumor Necrosis Factor-α. Curr Mol Med 2023; 23:87-95. [PMID: 34994326 DOI: 10.2174/1566524022666220106154111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 10/18/2021] [Accepted: 11/25/2021] [Indexed: 12/16/2022]
Abstract
BACKGROUND Autoimmune hepatitis (AIH) is an inflammatory liver disease that is characterized histologically by interface hepatitis, biochemically by elevated transaminase levels, and serologically by the presence of autoantibodies. Toll-like receptor (TLR)-4 is a TLR family member that, upon activation in hepatocytes, initiates a cascade of events. Interleukin-2 (IL-2) and tumour necrosis factor α (TNF-α) are potent inflammatory cytokines secreted in AIH, playing an important role in the early development of inflammation and hepatocyte damage. OBJECTIVES This study examined the role of cyclosporine in AIH and illustrated its actions on altered hepatic function in the silica-induced AIH model. METHODS AIH was induced in Wistar rats using sodium silicate. The rats were divided into four groups: the control group, silica-AIH group, cyclosporine-treated group, and prevention group. TLR-4 and IL-2 mRNA expressions in liver tissues were tested by RTPCR. RESULTS AIH was associated with up-regulation of liver enzymes, IL-2 and TLR-4 gene expression, while cyclosporine significantly down-regulated the expression of both. The relative quantity of TLR-4 mRNA was 1±0, 13.57±1.91, 4±0.38, and 2±0 in control, AIH, cyclosporine, and prevention groups, respectively (p<0.001). Also, the relative quantity of IL-2 mRNA was 1±0, 14.79±1.42, 7.07±0.96, and 3.4±0.55 in control, AIH, cyclosporine, and prevention groups, respectively (p<0.001). Additionally, immunohistochemical staining for TNF-α in liver sections was increased in the silica-AIH group but was found to decrease in the cyclosporine-treated and prevention groups. CONCLUSION This study advocates the therapeutic role of cyclosporine in treating immune-mediated hepatic diseases. Cyclosporine improves histological alterations in the liver and inhibits the production of proinflammatory cytokines.
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Affiliation(s)
| | - Ahmed M M Okasha
- Departments of Biochemistry, Minia University Minia 61511, Egypt
| | | | - Reham F Mohamed
- Pathology, Faculty of Medicine, Minia University Minia 61511, Egypt
| | - Sayed F Abdelwahab
- Department of Pharmaceutics and Industrial Pharmacy, College of Pharmacy, Taif University, Al-Haweiah, PO Box 11099, Taif 21944, Saudi Arabia
| | - Hatem A Mohamed
- Departments of Biochemistry, Minia University Minia 61511, Egypt
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Janssen LMF, Ghosh M, Lemaire F, Michael Pollard K, Hoet PHM. Exposure to silicates and systemic autoimmune-related outcomes in rodents: a systematic review. Part Fibre Toxicol 2022; 19:4. [PMID: 34996462 PMCID: PMC8739508 DOI: 10.1186/s12989-021-00439-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Accepted: 11/30/2021] [Indexed: 12/09/2022] Open
Abstract
BACKGROUND Autoimmunity can result from the interplay between genetic background and effects of environmental and/or occupational exposure to hazardous materials. Several compounds, including silica dust, have been linked with systemic autoimmunity and systemic autoimmune diseases, based on epidemiological evidence. For asbestos, a strong link with systemic autoimmune diseases does not yet exist, however, several studies have documented features of autoimmunity following asbestos exposure. Even so, human studies are limited in their ability to identify and examine isolated exposures, making it difficult to demonstrate causation or to assess pathogenic mechanisms. Therefore, this systematic review examines the existing animal evidence regarding autoimmunity and exposure to silicates (silica and asbestos). METHODS PubMed and EMBASE were systematically searched for peer-reviewed studies examining systemic autoimmune disease-related outcomes after silicate exposure in rodents. Literature databases were searched up to September 2021 for studies written in English and where the full text was available. Search strings were established based on a PECO (Population, Exposure, Comparator, Outcome) format. After title, abstract, and full-text screening, thirty-four studies were identified for further analysis. Quality assessment through ToxR tool and qualitative analysis of the results was performed. RESULTS Although there was significant heterogeneity in the included studies in terms of exposure protocol and genetic background of the rodent models used, it was noted that both genetic background and exposure to silicates [(crystalline) silica and asbestos] are highly relevant to the development of (sub-) clinical systemic autoimmune disease. CONCLUSION Parallels were observed between the findings from the animal (this review) and human (epidemiological) studies, arguing that experimental animal models are valuable tools for examining exacerbation or development of autoimmune disease after silicate exposure. However, genetic background and synergism between exposures should be considered in future studies.
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Affiliation(s)
- Lisa M F Janssen
- Laboratory of Toxicology, Unit of Environment and Health, Department of Public Health and Primary Care, KU Leuven, Leuven, Belgium
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), KU Leuven, Leuven, Belgium
| | - Manosij Ghosh
- Laboratory of Toxicology, Unit of Environment and Health, Department of Public Health and Primary Care, KU Leuven, Leuven, Belgium
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), KU Leuven, Leuven, Belgium
| | - Frauke Lemaire
- Laboratory of Toxicology, Unit of Environment and Health, Department of Public Health and Primary Care, KU Leuven, Leuven, Belgium
| | - K Michael Pollard
- Department of Molecular Medicine, Scripps Research, La Jolla, CA, 92037, USA
| | - Peter H M Hoet
- Laboratory of Toxicology, Unit of Environment and Health, Department of Public Health and Primary Care, KU Leuven, Leuven, Belgium.
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), KU Leuven, Leuven, Belgium.
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Drenovska K, Shahid M, Vassileva S. Nickel and Skin: From Allergy to Autoimmunity. Endocr Metab Immune Disord Drug Targets 2020; 20:1032-1040. [DOI: 10.2174/1871530320666191231115437] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 05/13/2019] [Accepted: 05/28/2019] [Indexed: 11/22/2022]
Abstract
Introduction & Objectives:
Cutaneous and systemic reactions to various metal implants and
medical devices have been well documented. The aim of this review was to focus on the probable
common mechanisms of allergy and autoimmunity that may lead to similar clinical outcomes following
the growing evidence in the literature of metal and nickel-related systemic, autoimmune or autoinflammatory
disorders.
Methods:
Detailed search of the available electronic databases (PubMed-Medline) was conducted for
review of the literature on that topic till the present moment.
Results:
Multiple reports on the immunological effects of metals including immunomodulation, allergy,
or autoimmunity were identified. It was found that metals may act through immunosuppression,
immunotoxicity, or as immune adjuvants thus provoking allergy and autoimmunity in susceptible individuals.
Both external or internal exposure to metals was observed. Nickel has been identified as the
most common sensitizer, and also the most studied one. The coexistence of both allergic and autoimmune
symptoms, induced by nickel, has been published, suggesting the autoimmune potential of nickel
compounds.
Conclusions:
Clinical experience and scientific literature together demonstrate that metals may play an
important role in the development of autoimmune diseases. While metal implant allergies and complications
are on the rise, they remain a diagnostic and therapeutic challenge. Elucidation of their possible
mechanisms will contribute to the more successful and safer treatment of affected individuals.
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Affiliation(s)
- Kossara Drenovska
- Department of Dermatology and Venereology, Sofia University of Medicine, Sofia, Bulgaria
| | - Martin Shahid
- Department of Dermatology and Venereology, Sofia University of Medicine, Sofia, Bulgaria
| | - Snejina Vassileva
- Department of Dermatology and Venereology, Sofia University of Medicine, Sofia, Bulgaria
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Nawrocki MJ, Majewski D, Puszczewicz M, Jagodziński PP. Decreased mRNA expression levels of DNA methyltransferases type 1 and 3A in systemic lupus erythematosus. Rheumatol Int 2017; 37:775-783. [PMID: 28349196 PMCID: PMC5397457 DOI: 10.1007/s00296-017-3711-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Accepted: 03/20/2017] [Indexed: 11/30/2022]
Abstract
OBJECTIVES Systemic lupus erythematosus (SLE) is a chronic relapsing autoimmune disease characterized by the presence of autoantibodies directed against nuclear antigens and by chronic inflammation. Although the etiology of SLE remains unclear, the influence of environment factors, which is largely reflected by the epigenetic mechanisms, with DNA methylation changes in particular, is generally considered as main players in the pathogenesis of SLE. We studied DNA methyltransferases' (DNMTs) type 1, 3A and 3B transcript levels in peripheral blood mononuclear cells from patients diagnosed with systemic lupus erythematosus and from the healthy control subjects. Furthermore, the association of DNMT1, DNMT3A, and DNMT3B mRNA levels with gender, age, and major clinical manifestations was analyzed. METHODS Peripheral blood mononuclear cells (PBMCs) were isolated from 32 SLE patients and 40 healthy controls. Reverse transcription and real-time quantitative polymerase chain reaction (RT-qPCR) analyses were used to determine DNMT1, DNMT3A, and DNMT3B mRNA expression levels. RESULTS Significantly lower DNMT1 (p = 0.015543) and DNMT3A (p = 0.003652) transcript levels in SLE patients were observed compared with healthy controls. Nevertheless, the DNMT3B mRNA expression levels were markedly lower compared with DNMT1 and DNMT3A, both in PBMCs from affected patients and those from control subjects. Furthermore, the DNMT1 transcript levels were positively correlated with SLE disease activity index (SLEDAI) (r s = 0.4087, p = 0.020224), while the DNMT3A transcript levels were negatively correlated with patients age (r s = -0.3765, p = 0.03369). CONCLUSIONS Our analyses confirmed the importance of epigenetic alterations in SLE etiology. Moreover, our results suggest that the presence of some clinical manifestations, such as phototosensitivity and arthritis, might be associated with the dysregulation of DNA methyltransferases' mRNA expression levels.
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Affiliation(s)
- Mariusz J Nawrocki
- Department of Biochemistry and Molecular Biology, Poznań University of Medical Sciences, 6 Święcickiego St., 60-781, Poznań, Poland.
| | - Dominik Majewski
- Department of Rheumatology and Internal Diseases, Poznań University of Medical Science, 135/147 28 Czerwca 1956 r. St., 61-545, Poznań, Poland
| | - Mariusz Puszczewicz
- Department of Rheumatology and Internal Diseases, Poznań University of Medical Science, 135/147 28 Czerwca 1956 r. St., 61-545, Poznań, Poland
| | - Paweł P Jagodziński
- Department of Biochemistry and Molecular Biology, Poznań University of Medical Sciences, 6 Święcickiego St., 60-781, Poznań, Poland
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Abstract
Inhalation of dust containing crystalline silica is associated with a number of acute and chronic diseases including systemic autoimmune diseases. Evidence for the link with autoimmune disease comes from epidemiological studies linking occupational exposure to crystalline silica dust with the systemic autoimmune diseases systemic lupus erythematosus, systemic sclerosis, and rheumatoid arthritis. Although little is known regarding the mechanism by which silica exposure leads to systemic autoimmune disease, there is a voluminous literature on silica exposure and silicosis that may help identify immune processes that precede development of autoimmunity. The pathophysiology of silicosis consists of deposition of silica particles in the alveoli of the lung. Ingestion of these particles by macrophages initiates an inflammatory response, which stimulates fibroblasts to proliferate and produce collagen. Silica particles are encased by collagen leading to fibrosis and the nodular lesions characteristic of the disease. The steps in the development of silicosis, including acute and chronic inflammation and fibrosis, have different molecular and cellular requirements, suggesting that silica-induced inflammation and fibrosis may be mechanistically separate. Significantly, it is unclear whether silica-induced inflammation and fibrosis contribute similarly to the development of autoimmunity. Nonetheless, the findings from human and animal model studies are consistent with an autoimmune pathogenesis that begins with activation of the innate immune system leading to proinflammatory cytokine production, pulmonary inflammation leading to activation of adaptive immunity, breaking of tolerance, and autoantibodies and tissue damage. The variable frequency of these immunological features following silica exposure suggests substantial genetic involvement and gene/environment interaction in silica-induced autoimmunity. However, numerous questions remain unanswered.
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Affiliation(s)
- Kenneth Michael Pollard
- Department of Molecular and Experimental Medicine, The Scripps Research Institute , La Jolla, CA , USA
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Nawrocki M, Strugała A, Piotrowski P, Wudarski M, Olesińska M, Jagodziński P. JHDM1D and HDAC1–3 mRNA expression levels in peripheral blood mononuclear cells of patients with systemic lupus erythematosus. Z Rheumatol 2015; 74:902-10. [DOI: 10.1007/s00393-015-1619-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Parks CG, De Roos AJ. Pesticides, chemical and industrial exposures in relation to systemic lupus erythematosus. Lupus 2014; 23:527-36. [PMID: 24763537 DOI: 10.1177/0961203313511680] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Growing evidence suggests exposure to chemicals and industrial pollutants may increase risk of systemic lupus erythematosus (SLE). Here we review research on SLE associations with occupational and industrial exposures, primarily drawing on studies in human populations and summarizing epidemiologic research published in the past decade. The association of occupational silica exposure with SLE is well established, but key questions remain, including the required dose and susceptibility factors, and SLE risk due to other silicate exposures. Research on SLE and other exposures is less well developed, though several potential associations merit further consideration because of the consistency of preliminary human findings, experimental animal research, and biologic plausibility. These include pesticides and solvents, for which experimental findings also support investigation of specific agents, including organochlorines and trichloroethylene. Experimental findings and biologic plausibility suggest research on SLE and occupational exposure to hydrocarbons (i.e. mineral oils) is warranted, especially given the widespread exposures in the population. Experimental and limited human findings support further investigation of SLE related to mercury exposure, especially in dental occupations. Research on environmental risk factors in risk-enriched cohorts (family-based) is recommended, as is further investigation of exposures in relation to intermediate markers of effect (e.g. antinuclear antibodies), clinical features (e.g. nephritis), and outcomes.
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Affiliation(s)
- C G Parks
- 1Epidemiology Branch, National Institute of Environmental Health Sciences, NC, USA
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Hong M, Ma B, Lin Z, Zhou X, Geng X, Shen L, Li B. Hep-2 cell based indirect immunofluorescence assay for antinuclear antibodies as a potential diagnosis of drug-induced autoimmunity in nonclinical toxicity testing. Regul Toxicol Pharmacol 2014; 71:141-7. [PMID: 25455225 DOI: 10.1016/j.yrtph.2014.10.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 10/08/2014] [Accepted: 10/13/2014] [Indexed: 01/20/2023]
Abstract
Antinuclear antibodies (ANAs) are important biomarkers in the diagnosis of autoimmune diseases in humans; however, the diagnostic performance of ANA in nonclinical safety studies are not well understood. Here, we studied the use of ANAs as potential nonclinical biomarkers for drug-induced autoimmunity (DIA) using a Hep-2 based indirect immunofluorescence assay (IFA). Initially, MRL-fas(lpr)/J mice and HgCl₂-treated rats were used as SLE-positive models. Serum samples obtained from 94 normal mice or 204 normal rats aged one to four months served as the negative control. The IFA effectively distinguished ANAs-positive samples in both species with a cut-off titer of 1:100. Brown Norway rats were treated with 450 mg/kg D-penicillamine for 30 consecutive days. ANAs were generated and corresponded with DIA development. Human Hep-2 cells, mice Neuro 2A cells, and Chinese Hamster Lung cells served as antigen from different species, which were found cross-reactive with ANA-positive serum samples from mice, rats, and humans without any differences in diagnosis. This methodology showed no species-specificity for ANA detection. Furthermore, we found approximately 20 percentage of the mice aged seven to eight months demonstrated age-related ANAs, which was consistent with humans. Overall, our findings demonstrated the use of ANA detection using IFA in the nonclinical diagnosis of murine drug-induced autoimmunity, and age-related ANAs should be considered when aged animals are used.
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Affiliation(s)
- Min Hong
- National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, China Food and Drug Administration, 100176 Beijing, People's Republic of China
| | - Ben Ma
- National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, China Food and Drug Administration, 100176 Beijing, People's Republic of China
| | - Zhi Lin
- National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, China Food and Drug Administration, 100176 Beijing, People's Republic of China
| | - Xiaobing Zhou
- National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, China Food and Drug Administration, 100176 Beijing, People's Republic of China
| | - Xingchao Geng
- National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, China Food and Drug Administration, 100176 Beijing, People's Republic of China
| | - Lianzhong Shen
- National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, China Food and Drug Administration, 100176 Beijing, People's Republic of China
| | - Bo Li
- National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, China Food and Drug Administration, 100176 Beijing, People's Republic of China.
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Pollard KM, Kono DH. Requirements for innate immune pathways in environmentally induced autoimmunity. BMC Med 2013; 11:100. [PMID: 23557436 PMCID: PMC3616845 DOI: 10.1186/1741-7015-11-100] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2012] [Accepted: 03/07/2013] [Indexed: 02/06/2023] Open
Abstract
There is substantial evidence that environmental triggers in combination with genetic and stochastic factors play an important role in spontaneous autoimmune disease. Although the specific environmental agents and how they promote autoimmunity remain largely unknown, in part because of diverse etiologies, environmentally induced autoimmune models can provide insights into potential mechanisms. Studies of idiopathic and environmentally induced systemic autoimmunity show that they are mediated by common adaptive immune response genes. By contrast, although the innate immune system is indispensable for autoimmunity, there are clear differences in the molecular and cellular innate components that mediate specific systemic autoimmune diseases, suggesting distinct autoimmune-promoting pathways. Some of these differences may be related to the bifurcation of toll-like receptor signaling that distinguishes interferon regulatory factor 7-mediated type I interferon production from nuclear factor-κB-driven proinflammatory cytokine expression. Accordingly, idiopathic and pristane-induced systemic autoimmunity require both type I interferon and proinflammatory cytokines whereas the less aggressive mercury-induced autoimmunity, although dependent on nucleic acid-binding toll-like receptors, does not require type I interferon but needs proinflammatory cytokines. Scavenger receptors and the inflammasome may contribute to silica-induced autoimmunity. Greater understanding of the innate mechanisms responsible for idiopathic and environmentally induced autoimmunity should yield new information into the processes that instigate and drive systemic autoimmunity.
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Affiliation(s)
- Kenneth Michael Pollard
- Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA.
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Silicon, a Possible Link between Environmental Exposure and Autoimmune Diseases: The Case of Rheumatoid Arthritis. ARTHRITIS 2012; 2012:604187. [PMID: 23119159 PMCID: PMC3483651 DOI: 10.1155/2012/604187] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2012] [Accepted: 09/13/2012] [Indexed: 12/28/2022]
Abstract
Silicon is one of the most common chemicals on earth. Several compounds such as silica, asbestos, silicone or, nanoparticles are built from tetrahedral units with silicon as the central atom. Despite these, structural similarities, they have rarely been analyzed as a group. These compounds generate significant biological alterations that include immune hyperactivation, production of the reactive species of oxygen and tissue injury. These pathological processes may trigger autoimmune responses and lead to the development of rheumatoid arthritis. Populations at risk include those that constantly work in industrial process, mining, and agriculture as well as those that undergo silicone implants. Herein a review on the main features of these compounds and how they may induce autoimmune responses is presented.
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Matsui S, Tsuji H, Ono S. An elderly 'kawara' craftsman with acute kidney injury and haemoptysis: a case of silica-induced autoimmunity. Clin Kidney J 2011; 4:25-7. [PMID: 25984095 PMCID: PMC4421627 DOI: 10.1093/ndtplus/sfq182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2010] [Revised: 09/25/2010] [Accepted: 09/28/2010] [Indexed: 11/15/2022] Open
Abstract
A 62-year-old Japanese ‘kawara’ (ceramic roof tile) craftsman presented with acute kidney injury and haemoptysis. This case met the systemic lupus erythematosus and microscopic polyangiitis criteria, with high titres of myeloperoxidase–antineutrophil cytoplasmic antibody (570 EU). Results showed the presence of antinuclear antibody at a high titre (1:2560), but detection of rheumatoid factor, anti-dsDNA, anti-SSA and anti-SSB antibodies was not apparent. This serology was similar to drug-induced, silicon-induced or silica-induced autoimmunity. The patient had been exposed to silica for > 40 years. The environmental aetiology of autoimmune diseases should be considered in cases that show atypical epidemiology and serology.
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Affiliation(s)
- Satoshi Matsui
- Department of Nephrology and Hypertension , Mitsubishi Kyoto Hospital , Kyoto , Japan
| | - Hiroko Tsuji
- Department of Nephrology and Hypertension , Mitsubishi Kyoto Hospital , Kyoto , Japan
| | - Shinji Ono
- Department of Nephrology and Hypertension , Mitsubishi Kyoto Hospital , Kyoto , Japan
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Al-Mogairen SM. Role of sodium silicate in induction of scleroderma-related autoantibodies in brown Norway rats through oral and subcutaneous administration. Rheumatol Int 2010; 31:611-5. [PMID: 20049452 DOI: 10.1007/s00296-009-1327-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2009] [Accepted: 12/20/2009] [Indexed: 10/20/2022]
Abstract
Silica hazard is a growing occupational problem and has been reported to be associated with scleroderma via case reports and occupational studies. The aim of this study is to demonstrate whether oral or subcutaneous silicate exposure can induce an autoimmunity and scleroderma susceptibility in immunosensitive rats. Sodium silicate in a dose of 3 mg in 0.2 ml NS was administered through oral and subcutaneous routes to 20 brown Norway rats. Autoantibodies including ANA, anti-RNP, anti-SCL70 and anti-centromere were measured and compared with pre- and post-challenge serum samples. Serum ANA and anti-RNP were high in significant number of rats (P < 0.05) of only the subcutaneous silicate group. There is an increase in the number of positive readings of autoantibodies at 14th week in comparison with the number of positive readings of autoantibodies at 7th week but P values were not significant. It may be concluded that silicate might induce autoimmunity and scleroderma and it seems to be that the longer the duration of exposure the greater the risk. This is probably the first experimental animal study demonstrating the induction of scleroderma-related autoantibodies after challenge with silicate.
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Al-Mogairen SM. Induction of autoimmunity in brown Norway rats by oral and parenteral administration of nickel chloride. Lupus 2009; 19:262-7. [PMID: 20008444 DOI: 10.1177/0961203309351728] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Nickel intolerance owing to sensitization is a growing problem. The main objective of this study was to examine the relationship between nickel chloride and induction of autoimmunity in genetically susceptible rats. Thirty brown Norway rats were randomized into four treatment groups; the first and second groups received nickel chloride 4.5 mg in 0.2 ml normal saline either orally or subcutaneously, and the third and fourth groups (controls) received normal saline (0.9%) 0.2 ml through the same routes. A significant number of rats (P < 0.05) that received nickel chloride by the subcutaneous or oral routes showed a high level of serum antinuclear antibody (ANA) compared with controls. A significant number of rats (P < 0.05) that received nickel chloride by the subcutaneous route showed high serum anti-SSA, but the number of rats with anti-SSA was insignificant in the group that received nickel by the oral route. Other autoantibodies found in both groups (anti-double-stranded (ds)DNA, anti-Smith, anti-SSB) showed a gradual increase, but the number of rats with positive titers post exposure was not significant statistically. Nickel chloride exposure in the rats appeared to induce the development of autoimmunity. A longer duration following exposure to nickel chloride seems to be associated with greater risks.
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Affiliation(s)
- S M Al-Mogairen
- Department of Medicine, Rheumatology Division, College of Medicine, King Khalid University Hospital, King Saud University, Riyadh, Saudi Arabia.
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Nickel-induced allergy and contact dermatitis: does it induce autoimmunity and cutaneous sclerosis? An experimental study in Brown Norway rats. Rheumatol Int 2009; 30:1159-64. [DOI: 10.1007/s00296-009-1117-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2009] [Accepted: 08/12/2009] [Indexed: 11/25/2022]
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