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Vitturi BK, Montecucco A, Rahmani A, Dini G, Durando P. Occupational risk factors for multiple sclerosis: a systematic review with meta-analysis. Front Public Health 2023; 11:1285103. [PMID: 38054069 PMCID: PMC10694508 DOI: 10.3389/fpubh.2023.1285103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 11/02/2023] [Indexed: 12/07/2023] Open
Abstract
Objective We decided to conduct the first systematic review with meta-analysis to provide the highest level of up-to-date evidence on the occupational risk factors for Multiple Sclerosis. Methods A systematic, comprehensive literature search was performed in four electronic academic databases. We included any case-control study that enrolled working-age subjects and compared the proportion of MS cases with controls who were not exposed to an occupational risk factor. The primary outcome was the occurrence of MS. The quality assessment was performed with the Critical Appraisal Checklist for Case Control Studies, developed, and validated by the Joanna Briggs Institute. All the selection process was also carried out by two independent and previously trained researchers. Results Overall, the total sample included 19,004 people with MS and 4,164,162 controls. Agricultural workers (OR = 1.44, 95% CI 1.13-1.83), offshore workers (OR = 3.56, 95% CI 2.74-4.61), and hairdressers (OR = 8.25, 95% CI 1.02-66.52) were associated with a higher probability of being diagnosed with MS. In parallel, workers exposed to toxic fumes from oil wells (OR = 16.80, 95% CI 8.33-33.90), low-frequency magnetic fields (OR = 1.71, 95% CI 1.03-2.72), and pesticides (OR = 3.17, 95% CI = 2.53-3.99) also had an increased likelihood of having MS. Conclusion Our study has the potential to influence more assertive public policies. Nevertheless, future studies on how the occupational setting may contribute to the incidence of MS are highly recommended. Systematic review registration The protocol was registered in the international prospective register of systematic reviews (PROSPERO- CRD42023443257).
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Affiliation(s)
| | - Alfredo Montecucco
- Department of Health Sciences, University of Genoa, Genoa, Italy
- Occupational Medicine Unit, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Alborz Rahmani
- Department of Health Sciences, University of Genoa, Genoa, Italy
| | - Guglielmo Dini
- Department of Health Sciences, University of Genoa, Genoa, Italy
- Occupational Medicine Unit, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Paolo Durando
- Department of Health Sciences, University of Genoa, Genoa, Italy
- Occupational Medicine Unit, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
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Alfredsson L, Hillert J, Olsson T, Hedström AK. Observed associations between indicators of socioeconomic status and risk of multiple sclerosis in Sweden are explained by a few lifestyle-related factors. Eur J Neurol 2023; 30:1001-1013. [PMID: 36692896 DOI: 10.1111/ene.15705] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 11/24/2022] [Accepted: 12/22/2022] [Indexed: 01/25/2023]
Abstract
BACKGROUND AND PURPOSE The association between socioeconomic status (SES) and the risk of multiple sclerosis (MS) is unclear. The aim was to study whether a potential association between indicators of SES and MS risk in Sweden is explained by lifestyle/environmental factors. METHODS Using the Swedish MS registry and the Swedish patient registries, a register study was performed comprising all cases diagnosed with MS in Sweden between 1990 and 2018 (N = 24,729) and five randomly selected controls per case, matched by year and age at disease onset, sex and residential area at disease onset. Data from two matched case-control studies combined comprising data on environment/lifestyle factors (7193 cases, 9609 controls, inclusion period 2005-2018) were also utilized. For all participants, information regarding ancestry, formal education (available 1990-2018) and family income (available 1998-2018) was retrieved from the National Board of Health and Welfare. RESULTS The registry study revealed no association between education and MS risk, whereas an income exceeding the upper quartile was associated with lower MS risk compared to having an income in the lowest quartile (odds ratio 0.86, 95% confidence interval 0.82-0.90). These findings were replicated in the crude analyses of the case-control study. However, after adjustment for confounding, no association was observed between income and risk of MS. CONCLUSIONS Education and income were not associated with occurrence of MS after adjustment for a few lifestyle-related factors (smoking, alcohol consumption, body mass index and sun exposure habits), indicating that SES has no influence on MS risk besides its association with these lifestyle factors in the Swedish context.
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Affiliation(s)
- Lars Alfredsson
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
- Center for Occupational and Environmental Medicine, Stockholm, Sweden
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Jan Hillert
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Tomas Olsson
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Anna Karin Hedström
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
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Dastoorpoor M, Nabavi SM, Majdinasab N, Zare Javid A, Ahmadi Angali K, Seyedtabib M. A case-control study of drinking beverages and the risk of multiple sclerosis in Iran. JOURNAL OF HEALTH, POPULATION, AND NUTRITION 2023; 42:22. [PMID: 36959679 PMCID: PMC10037787 DOI: 10.1186/s41043-023-00364-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Accepted: 03/16/2023] [Indexed: 03/25/2023]
Abstract
BACKGROUND There is no study in the world on the relationship between consuming black and green tea as beverages containing polyphenols and the risk of MS. This study aimed to determine the association between the consumption of green and black tea, coffee, non-alcoholic beer, milk, fruit juices and carbonated beverages with the risk of MS. METHODS AND MATERIALS This case-control study was performed on 150 patients with MS and 300 healthy individuals as a control group among patients who were referred to the ophthalmology ward of a referral hospital in Ahvaz with the groups matching for age. The data collection tool was a researcher-made questionnaire including demographic information and beverage consumption. Analysis was performed using univariate and multiple logistic regression models. RESULTS The mean age of patients at the time of diagnosis was 38.55 ± 8.88 years. The results showed that drinking milk (OR = 5.46), natural juice (OR = 2.49), and carbonated beverages (OR = 16.17) were associated with an increased chance of developing MS. However, drinking non-alcoholic beer (OR = 0.48), black tea (OR = 0.20), green tea (OR = 0.29) and coffee (OR = 0.07) were associated with a reduced chance of developing MS. CONCLUSION The results show that drinking black and green tea, non-alcoholic beer, and coffee are associated with a decrease in the chance of developing MS. The results of this study can be used to design interventional research and to change people's lifestyles to prevent MS.
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Affiliation(s)
- Maryam Dastoorpoor
- Department of Biostatistics and Epidemiology, Musculoskeletal Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Seyed Massood Nabavi
- Department of Regenerative Biomedicine, Royan Institute for Stem Cell Biology and Technology, ACCR, Tehran, Iran
- Department of Brain and Cognition, Royan Institute for Stem Cell Biology and Technology, ACCR, Tehran, Iran
| | - Nastaran Majdinasab
- Department of Neurology, Musculoskeletal Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Ahmad Zare Javid
- Department of Nutritional Sciences, School of Allied Medical Sciences, Nutrition, and Metabolic Disease Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Kambiz Ahmadi Angali
- Department of Biostatistics and Epidemiology, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Maryam Seyedtabib
- Department of Biostatistics and Epidemiology, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
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Wilson S, Calocer F, Rollot F, Fauvernier M, Remontet L, Tron L, Vukusic S, Le Page E, Debouverie M, Ciron J, Ruet A, De Sèze J, Zephir H, Moreau T, Lebrun-Frénay C, Laplaud DA, Clavelou P, Labauge P, Berger E, Pelletier J, Heinzlef O, Thouvenot E, Camdessanché JP, Leray E, Dejardin O, Defer G. Effects of socioeconomic status on excess mortality in patients with multiple sclerosis in France: A retrospective observational cohort study. Lancet Reg Health Eur 2023; 24:100542. [PMID: 36426377 PMCID: PMC9678948 DOI: 10.1016/j.lanepe.2022.100542] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 10/21/2022] [Accepted: 10/25/2022] [Indexed: 11/19/2022] Open
Abstract
Background The effects of socio-economic status on mortality in patients with multiple sclerosis is not well known. The objective was to examine mortality due to multiple sclerosis according to socio-economic status. Methods A retrospective observational cohort design was used with recruitment from 18 French multiple sclerosis expert centers participating in the Observatoire Français de la Sclérose en Plaques. All patients lived in metropolitan France and had a definite or probable diagnosis of multiple sclerosis according to either Poser or McDonald criteria with an onset of disease between 1960 and 2015. Initial phenotype was either relapsing-onset or primary progressive onset. Vital status was updated on January 1st 2016. Socio-economic status was measured by an ecological index, the European Deprivation Index and was attributed to each patient according to their home address. Excess death rates were studied according to socio-economic status using additive excess hazard models with multidimensional penalised splines. The initial hypothesis was a potential socio-economic gradient in excess mortality. Findings A total of 34,169 multiple sclerosis patients were included (88% relapsing onset (n = 30,083), 12% progressive onset (n = 4086)), female/male sex ratio 2.7 for relapsing-onset and 1.3 for progressive-onset). Mean age at disease onset was 31.6 (SD = 9.8) for relapsing-onset and 42.7 (SD = 10.8) for progressive-onset. At the end of follow-up, 1849 patients had died (4.4% for relapsing-onset (n = 1311) and 13.2% for progressive-onset (n = 538)). A socio-economic gradient was found for relapsing-onset patients; more deprived patients had a greater excess death rate. At thirty years of disease duration and a year of onset of symptoms of 1980, survival probability difference (or deprivation gap) between less deprived relapsing-onset patients (EDI = −6) and more deprived relapsing-onset patients (EDI = 12) was 16.6% (95% confidence interval (CI) [10.3%–22.9%]) for men and 12.3% (95%CI [7.6%–17.0%]) for women. No clear socio-economic mortality gradient was found in progressive-onset patients. Interpretation Socio-economic status was associated with mortality due to multiple sclerosis in relapsing-onset patients. Improvements in overall care of more socio-economically deprived patients with multiple sclerosis could help reduce these socio-economic inequalities in multiple sclerosis-related mortality. Funding This study was funded by the ARSEP foundation “Fondation pour l'aide à la recherche sur la Sclérose en Plaques” (Grant Reference Number 1122). Data collection has been supported by a grant provided by the French State and handled by the “Agence Nationale de la Recherche,” within the framework of the “Investments for the Future” programme, under the reference ANR-10-COHO-002, Observatoire Français de la Sclérose en Plaques (OFSEP).
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Affiliation(s)
- Sarah Wilson
- UNICAEN, CHU de Caen, INSERM U1086 ANTICIPE, Pôle de Recherche, Normandy University, Caen 14000, France
- Corresponding author. INSERM UMR 1086 “ANTICIPE”, University of Caen Normandy, Comprehensive Cancer Center Francois Baclesse, Avenue du General Harris, 14076 Caen Cedex 5, France.
| | - Floriane Calocer
- Department of Neurology, UNICAEN, Normandy University, MS Expert Center, CHU de Caen Normandy, Caen 14000, France
| | - Fabien Rollot
- Université de Lyon, Université Claude Bernard Lyon 1, Lyon 69000, France
- Hospices Civils de Lyon, Hôpital Neurologique, Service de Neurologie, Sclérose en Plaques, Pathologies de la Myéline et Neuro-Inflammation, Bron 69500, France
- Observatoire Français de la Sclérose en Plaques, Centre de Recherche en Neurosciences de Lyon, INSERM 1028 et CNRS UMR 5292, Lyon 69000, France
- EUGENE DEVIC EDMUS Foundation Against Multiple Sclerosis, State-Approved Foundation, Bron, France
| | - Mathieu Fauvernier
- Service de Biostatistique–Bioinformatique, Pôle Santé Publique, Hospices Civils de Lyon, Lyon 69000, France
- Université Lyon 1, CNRS, UMR 5558, Laboratoire de Biométrie et Biologie Evolutive, Lyon 69000, France
| | - Laurent Remontet
- Service de Biostatistique–Bioinformatique, Pôle Santé Publique, Hospices Civils de Lyon, Lyon 69000, France
- Université Lyon 1, CNRS, UMR 5558, Laboratoire de Biométrie et Biologie Evolutive, Lyon 69000, France
| | - Laure Tron
- UNICAEN, CHU de Caen, INSERM U1086 ANTICIPE, Pôle de Recherche, Normandy University, Caen 14000, France
| | - Sandra Vukusic
- Université de Lyon, Université Claude Bernard Lyon 1, Lyon 69000, France
- Hospices Civils de Lyon, Hôpital Neurologique, Service de Neurologie, Sclérose en Plaques, Pathologies de la Myéline et Neuro-Inflammation, Bron 69500, France
- Observatoire Français de la Sclérose en Plaques, Centre de Recherche en Neurosciences de Lyon, INSERM 1028 et CNRS UMR 5292, Lyon 69000, France
- EUGENE DEVIC EDMUS Foundation Against Multiple Sclerosis, State-Approved Foundation, Bron, France
| | | | - Marc Debouverie
- Department of Neurology, Nancy University Hospital, Nancy, France
- Université de Lorraine, APEMAC, Nancy F-54000, France
| | - Jonathan Ciron
- Department of Neurology, CHU de Toulouse, CRC-SEP, Toulouse Cedex 9 F-31059, France
- Université Toulouse III, Infinity, INSERM UMR1291 - CNRS UMR5051, Toulouse Cedex 3 F-31024, France
| | - Aurélie Ruet
- Univ. Bordeaux, Bordeaux F-33000, France
- INSERM U1215, Neurocentre Magendie, Bordeaux F-33000, France
- Department of Neurology, CHU de Bordeaux, CIC Bordeaux CIC1401, Bordeaux F-33000, France
| | - Jérôme De Sèze
- Department of Neurology and Clinical Investigation Center, CHU de Strasbourg, CIC 1434, INSERM 1434, Strasbourg F-67000, France
| | - Hélène Zephir
- CHU Lille, CRCSEP Lille, Univ Lille, U1172, Lille F-59000, France
| | - Thibault Moreau
- Department of Neurology, CHU de Dijon, EA4184, Dijon F-21000, France
| | - Christine Lebrun-Frénay
- Neurology, UR2CA, Centre Hospitalier Universitaire Pasteur2, Université Nice Côte d’Azur, Nice, France
| | - David-Axel Laplaud
- Nantes Université, CHU Nantes, INSERM, Center for Research in Transplantation and Translational Immunology, UMR 1064, CIC INSERM 1413, Service de Neurologie, Nantes F-44000, France
| | - Pierre Clavelou
- Department of Neurology, CHU Clermont-Ferrand, Clermont-Ferrand F-63000, France
- Université Clermont Auvergne, Inserm, Neuro-Dol, Clermont-Ferrand F-63000, France
| | - Pierre Labauge
- MS Unit, CHU de Montpellier, Montpellier Cedex 5 F-34295, France
- University of Montpellier (MUSE), Montpellier F-34000, France
| | - Eric Berger
- CHU de Besançon, Service de Neurologie 25 030, Besançon, France
| | - Jean Pelletier
- Aix Marseille Univ, APHM, Hôpital de la Timone, Pôle de Neurosciences Cliniques, Service de Neurologie, Marseille 13005, France
| | - Olivier Heinzlef
- Departement of Neurology, Hôpital de Poissy, Poissy F-78300, France
| | - Eric Thouvenot
- Department of Neurology, Nimes University Hospital, Nimes Cedex 9 F-30029, France
- Institut de Génomique Fonctionnelle, UMR5203, INSERM 1191, Univ. Montpellier, Montpellier Cedex 5 F-34094, France
| | | | - Emmanuelle Leray
- Univ Rennes, EHESP, CNRS, Inserm, Arènes - UMR 6051, RSMS (Recherche sur les Services et Management en Santé) - U 1309, Rennes F-35000, France
| | - Olivier Dejardin
- UNICAEN, CHU de Caen, INSERM U1086 ANTICIPE, Pôle de Recherche, Normandy University, Caen 14000, France
| | - Gilles Defer
- Department of Neurology, UNICAEN, Normandy University, MS Expert Center, CHU de Caen Normandy, Caen 14000, France
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Costantini E, Masciarelli E, Casorri L, Di Luigi M, Reale M. Medicinal herbs and multiple sclerosis: Overview on the hard balance between new therapeutic strategy and occupational health risk. Front Cell Neurosci 2022; 16:985943. [PMID: 36439198 PMCID: PMC9688751 DOI: 10.3389/fncel.2022.985943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Accepted: 10/20/2022] [Indexed: 11/11/2022] Open
Abstract
Multiple sclerosis (MS) is an autoimmune disease characterized by demyelination and axonal loss of the central nervous system (CNS). Despite its spread throughout the world, the mechanisms that determine its onset are still to be defined. Immunological, genetic, viral, and environmental factors and exposure to chemicals may trigger MS. Many studies have highlighted the anti-inflammatory and anti-oxidant effects of medicinal herbs, which make them a natural and complementary treatment for neurodegenerative diseases. A severe reduction of several MS symptoms occurs with herbal therapy. Thus, the request for medicinal plants with potential beneficial effects, for MS patients, is constantly increasing. Consequently, a production increase needs. Unfortunately, many medicinal herbs were untested and their action mechanism, possible adverse effects, contraindications, or interactions with other drugs, are poorly or not investigated. Keeping in mind the pathological mechanisms of MS and the oxidative damages and mitochondrial dysfunctions induced by pesticides, it is important to understand if pesticides used to increase agricultural productivity and their residues in medicinal plants, may increase the risk of developing MS in both workers and consumers. Studies providing some indication about the relationship between environmental exposure to pesticides and MS disease incidence are few, fragmentary, and discordant. The aim of this article is to provide a glance at the therapeutic potential of medicinal plants and at the risk for MS onset of pesticides used by medicinal plant growers and present in medicinal herbs.
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Affiliation(s)
- Erica Costantini
- Department of Medicine and Science of Aging, G. d’Annunzio University of Chieti–Pescara, Chieti, Italy
| | - Eva Masciarelli
- Department of Technological Innovations and Safety of Plants, Products and Anthropic Settlements, National Institute for Insurance Against Accidents at Work, Rome, Italy
| | - Laura Casorri
- Department of Technological Innovations and Safety of Plants, Products and Anthropic Settlements, National Institute for Insurance Against Accidents at Work, Rome, Italy
| | - Marco Di Luigi
- Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, INAIL Research Center, National Institute for Insurance Against Accidents at Work, Rome, Italy
| | - Marcella Reale
- Department of Innovative Technologies in Medicine and Dentistry, G. d’Annunzio University of Chieti–Pescara, Chieti, Italy
- *Correspondence: Marcella Reale,
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Knyszyńska A, Skonieczna-Żydecka K, Koziarska D, Stachowska L, Kotwas A, Kulaszyńska M, Lubkowska A, Karakiewicz B. Searching for the Relationship between the Concentration of Heavy Metals in the Blood and the Clinical Course of Multiple Sclerosis: A Cross-Sectional Study in Poland. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19116548. [PMID: 35682135 PMCID: PMC9180468 DOI: 10.3390/ijerph19116548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 05/24/2022] [Accepted: 05/25/2022] [Indexed: 11/16/2022]
Abstract
(1) Background: Of all environmental pollutants, heavy metals have the most detrimental effect on public health because they remain in the ecosystem and are not biodegradable. The neurotoxicity of heavy metals, including cadmium and lead, has been well documented, and blood levels of heavy metals serve as a biomarker of exposure, reflecting their content in soft tissues. Multiple sclerosis (MS) is one of the most common chronic neurodegenerative diseases. The pathogenesis of MS is complex and relies on the interaction between genetic and environmental factors. The aim of this study was to search for the relationship between the values of cadmium and lead concentration in the blood and the health history and functional status of patients with MS. (2) Methods: The study group consisted of 151 patients with a clinical diagnosis of MS. Determination of the presence of tested elements in serum was performed using an ELAN DRC-e ICP mass spectrometer. (3) Results: Statistical analysis demonstrated that an increase in the level of cadmium was accompanied by an increase in the level of lead. There was no significant correlation between the blood lead concentration and the functional status assessed by EDSS among patients with MS in Poland. However, a tendency towards worse functional status of patients with higher blood lead concentration (p = 0.07) was demonstrated. Patients who experienced first MS symptoms at older age had higher blood levels of the tested metals. (4) Conclusions: The concentrations of cadmium and lead in the blood of MS patients in Poland were not factors differentiating their functional status and the course of the disease.
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Affiliation(s)
- Anna Knyszyńska
- Department of Functional Diagnostics and Physical Medicine, Pomeranian Medical University in Szczecin, 71-210 Szczecin, Poland; (A.K.); (A.L.)
| | - Karolina Skonieczna-Żydecka
- Department of Biochemical Sciences, Pomeranian Medical University in Szczecin, Broniewskiego 24, 71-460 Szczecin, Poland; (L.S.); (M.K.)
- Correspondence:
| | - Dorota Koziarska
- Department of Neurology, Pomeranian Medical University in Szczecin, Unii Lubelskiej 1, 72-252 Szczecin, Poland;
| | - Laura Stachowska
- Department of Biochemical Sciences, Pomeranian Medical University in Szczecin, Broniewskiego 24, 71-460 Szczecin, Poland; (L.S.); (M.K.)
| | - Artur Kotwas
- Subdepartment of Social Medicine and Public Health, Department of Social Medicine, Pomeranian Medical University in Szczecin, Żołnierska 48, 71-210 Szczecin, Poland; (A.K.); (B.K.)
| | - Monika Kulaszyńska
- Department of Biochemical Sciences, Pomeranian Medical University in Szczecin, Broniewskiego 24, 71-460 Szczecin, Poland; (L.S.); (M.K.)
| | - Anna Lubkowska
- Department of Functional Diagnostics and Physical Medicine, Pomeranian Medical University in Szczecin, 71-210 Szczecin, Poland; (A.K.); (A.L.)
| | - Beata Karakiewicz
- Subdepartment of Social Medicine and Public Health, Department of Social Medicine, Pomeranian Medical University in Szczecin, Żołnierska 48, 71-210 Szczecin, Poland; (A.K.); (B.K.)
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Magyari M, Joensen H, Laursen B, Koch-Henriksen N. The Danish Multiple Sclerosis Registry. Brain Behav 2021; 11:e01921. [PMID: 33128351 PMCID: PMC7821574 DOI: 10.1002/brb3.1921] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Revised: 09/23/2020] [Accepted: 10/14/2020] [Indexed: 01/03/2023] Open
Abstract
OBJECTIVES The Danish Multiple Sclerosis Registry is the oldest operative and nationwide MS registry. We present The Danish Multiple Sclerosis Registry with its history, data collection, scientific contribution, and national and international research collaboration. MATERIALS AND METHODS Detailed description of data collection, completeness, quality optimizing procedures, funding, and legal, ethical and data protection issues are provided. RESULTS The total number of registered cases with clinical isolated syndrome and multiple sclerosis since 1956 was by start of May 2020 30,023 of whom 16,515 cases were alive and residing in Denmark, giving a prevalence rate of about 284 per 100,000 population. The mean annual number of new cases receiving an MS diagnosis was 649 per year in the period 2010 to 2019. In total, 7,945 patients (48.1%) are receiving disease modifying therapy at the start of May 2020. CONCLUSIONS Multiple Sclerosis registers are becoming increasingly important, not only for epidemiological research but also by quantifying the burden of the disease for the patients and society and helping health care providers and regulators in their decisions. The Danish Multiple Sclerosis Registry has served as data source for a number of scientific publications including epidemiological studies on changes in incidence and mortality, cohort studies investigating risk factors for developing MS, comorbidities and socioeconomic outcomes in the MS population, and observational studies on effectiveness of disease modifying treatments outside the narrow realms of randomized clinical trials.
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Affiliation(s)
- Melinda Magyari
- Department of Neurology, The Danish Multiple Sclerosis Registry, Rigshospitalet, Glostrup, Denmark.,Danish Multiple Sclerosis Center, Department of Neurology, Rigshospitalet, Glostrup, Denmark
| | - Hanna Joensen
- Department of Neurology, The Danish Multiple Sclerosis Registry, Rigshospitalet, Glostrup, Denmark
| | - Bjarne Laursen
- National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark
| | - Nils Koch-Henriksen
- Department of Neurology, The Danish Multiple Sclerosis Registry, Rigshospitalet, Glostrup, Denmark.,Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark
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Molazadeh N, Mohebi F, Altafi D, Sahraian MA. Prevalence and incidence of multiple sclerosis in Ardabil, Northwest of Iran. Mult Scler Relat Disord 2020; 47:102605. [PMID: 33217696 DOI: 10.1016/j.msard.2020.102605] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 10/17/2020] [Accepted: 10/26/2020] [Indexed: 10/23/2022]
Abstract
BACKGROUND Multiple sclerosis (MS) epidemiology is studies in many populations; however, studying populations with unique characteristics could provide opportunities to deepen the understanding of the underlying reason of the disease. In this regard, we aimed to study the epidemiology of MS in Ardabil, a province in northwest Iran, where the majority are of Iranian Azerbaijanis. METHOD A retrospective population-based study was conducted from 2008 to 2018 in Ardabil, based on the data of Iran's Ministry Of Health. Collected information includes sex, age, age at disease onset, education and type of MS. We used t-test to compare means and chi-square test to analyze the association among variables. RESULTS The total number of patients was 760 with 533 (70.13%) females and 227 (29.87%) males. The crude prevalence was 59.37 per 100,000 in 2018 (95% CI: 55.31, 63.73). The crude incidence rate was 7.65 per 100,000 in 2018 (95% CI: 6.28, 9.32). The most frequent educational level was high school diploma (38.36%). The relapsing-remitting (RR) form was the most frequent type of MS (48.16%). The F/M ratio was 2.92:1 and the mean onset age was 33.14 (95% CI: 31.56, 34.72) in 2018, significantly higher in males (P value= 0.01). CONCLUSION Ardabil is a medium risk zone of MS. The different ethnicity of its population, climate and environmental features, may explain the factors modulating the risk of MS in similar areas and present windows of opportunity to understand the causes of MS.
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Affiliation(s)
- Negar Molazadeh
- MS Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Farnam Mohebi
- Non-communicable Diseases Research Center, Endocrinology and Metabolism Population Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Davar Altafi
- Department of Neurology, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Mohammad Ali Sahraian
- MS Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, Iran.
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Gerhardsson L, Hou L, Pettersson K. Work-related exposure to organic solvents and the risk for multiple sclerosis-a systematic review. Int Arch Occup Environ Health 2020; 94:221-229. [PMID: 32880046 PMCID: PMC7872988 DOI: 10.1007/s00420-020-01564-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 08/25/2020] [Indexed: 11/12/2022]
Abstract
Purpose Multiple sclerosis (MS) is a chronic progressive neurological disorder. Several environmental factors have been discussed as possible causing agents, e.g. organic solvents, whose impact on the disease is analysed in this review.
Methods Systematic search strategies were used to identify high-quality studies of workers exposed to organic solvents, published up to September 30, 2019, in databases, such as PubMed, Cochrane library and Scopus. The exposure was in most studies obtained by questionnaires, supplemented with telephone interviews. The diagnosis MS was mainly detemined following a thorough neurological examination. Finally, fourteen case–control studies and two cohort studies met the inclusion criteria and were included in the meta-analysis. Random effects models were used to pool the results of the studies. Results The odds ratios from the 14 case–control studies included in the meta-analysis ranged from 0.12–4.0. Five case–control studies and one cohort study showed a significant association between the development of multiple sclerosis and exposure to organic solvents. The results from the other nine case–control studies and from one of the two cohort studies did not reach statistical significance. The pooled data from the 14 case–control studies gave an OR of 1.44 (95% CI 1.03–1.99), which shows a moderately increased risk of developing MS after exposure to organic solvents. Conclusions The final interpretation of the result is that organic solvents may be slightly associated with an increased risk to develop MS. In addition, other factors, e.g. genetic markers and smoking, may contribute to the development of the disease.
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Affiliation(s)
- Lars Gerhardsson
- Department of Occupational and Environmental Medicine, School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Medicinaregatan 16A, Box 414, 405 30, Gothenburg, Sweden.
| | - Linda Hou
- Institute of Neuroscience and Physiology, Rehabilitation Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,Feelgood Occupational Health Care AB, Gothenburg City, Sweden
| | - Kjell Pettersson
- Department of Occupational and Environmental Medicine, School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Medicinaregatan 16A, Box 414, 405 30, Gothenburg, Sweden
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10
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Schmid M, Michaud L, Bovio N, Guseva Canu I. Prevalence of somatic and psychiatric morbidity across occupations in Switzerland and its correlation with suicide mortality: results from the Swiss National Cohort (1990-2014). BMC Psychiatry 2020; 20:324. [PMID: 32571249 PMCID: PMC7310107 DOI: 10.1186/s12888-020-02733-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Accepted: 06/12/2020] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Suicide is a major and complex public health problem. In Switzerland, suicide accounts for about 1000 deaths yearly and is the fourth leading cause of mortality. The first nationwide Swiss study of suicides identified eight male and four female occupations with statistically significant excess of suicide compared to the general Swiss population. Working time, self-employer status, low socio-economic status and low skill level required for occupation were associated with increase in suicide risk. Presently, we aim to compare the distribution of suicide risk across occupations with the prevalence of somatic and psychiatric morbidity in Swiss working-aged adults. We hypothesized that some diseases would cluster in particular occupations, indicating potential work-relatedness of suicides found in these occupations. METHODS We used the Swiss National Cohort (SNC) and included 10575 males and 2756 females deceased by suicide between 1990 and 2014. We estimated the prevalence of 16 categories of concomitant diseases in each occupation, using national mortality records, and assessed the homogeneity of diseases distribution across occupations. For diseases, which prevalence varied significantly across occupations, we analyzed the correlation with the distribution of suicide risk, estimated as the standardized mortality ratio (SMR) of suicide. RESULTS Mental and behavioral disorders were the most commonly reported concomitant diseases in our population. In men, the prevalence of these disorders and more specifically, the prevalence of substance-related and addictive disorders, and of psychotic disorders varied significantly across occupations and was correlated with the SMR of suicide. The prevalence of malignant neoplasms and the prevalence of diseases of the musculoskeletal system and connective tissue also varied significantly across male occupations, while in women, such a variation was observed for neoplasms of uncertain or unknown behavior and diseases of the nervous system and sense organs, without being correlated with the SMR of suicide. CONCLUSION Some of the identified morbidities can be occupation-related and could negatively affect the working capacity and the employability, which in turn could be related to the suicide. Disentangling concomitant diseases according to their work-relatedness and relationship with the suicide risk is important for identifying occupation-related suicides, understanding their characteristics, and developing appropriated interventions for their prevention.
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Affiliation(s)
- M. Schmid
- grid.9851.50000 0001 2165 4204Center for Primary Care and Public Health (Unisanté), University of Lausanne, Département Sante, Travail, Environnement (DSTE), Biopôle, Route de la Corniche, 2, 1066 Epalinges-Lausanne, Switzerland ,grid.150338.c0000 0001 0721 9812Geneva University Hospital, Geneva, Switzerland
| | - L. Michaud
- grid.8515.90000 0001 0423 4662Psychiatric Liaison Service, Lausanne University Hospital, Lausanne, Switzerland
| | - N. Bovio
- grid.9851.50000 0001 2165 4204Center for Primary Care and Public Health (Unisanté), University of Lausanne, Département Sante, Travail, Environnement (DSTE), Biopôle, Route de la Corniche, 2, 1066 Epalinges-Lausanne, Switzerland
| | - I. Guseva Canu
- grid.9851.50000 0001 2165 4204Center for Primary Care and Public Health (Unisanté), University of Lausanne, Département Sante, Travail, Environnement (DSTE), Biopôle, Route de la Corniche, 2, 1066 Epalinges-Lausanne, Switzerland
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11
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Munk Nielsen N, Corn G, Frisch M, Stenager E, Koch-Henriksen N, Wohlfahrt J, Magyari M, Melbye M. Multiple sclerosis among first- and second-generation immigrants in Denmark: a population-based cohort study. Brain 2020; 142:1587-1597. [PMID: 31081503 DOI: 10.1093/brain/awz088] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 02/01/2019] [Accepted: 02/04/2019] [Indexed: 11/14/2022] Open
Abstract
Multiple sclerosis is a disease with a highly variable incidence worldwide. While knowledge about multiple sclerosis risk factors has grown over the years, the aetiology of multiple sclerosis has still not been fully established. We examined multiple sclerosis incidence rates among first-generation immigrants in Denmark, a high-incidence country, and their Danish-born children (second-generation immigrants), to evaluate the importance and timing of exposure to environmental factors in the aetiology of multiple sclerosis. By means of the Danish Civil Registration System we identified 9 121 187 individuals living in Denmark between 1968 and 2015, including 1 176 419 first-generation and 184 282 second-generation immigrants. Study participants were followed for multiple sclerosis in the Danish Multiple Sclerosis Registry from 1968 to 2015. The relative risk (RR) of multiple sclerosis according to immigration status was estimated by means of multiple sclerosis incidence rate ratios obtained in log-linear Poisson regression analysis. Altogether, 16 905 cases of multiple sclerosis were identified in the study cohort, 578 among first-generation and 106 among second-generation immigrants. Multiple sclerosis risk among first-generation immigrants whose parents were born in low, intermediate and high multiple sclerosis risk areas were 21% (RR = 0.21; 95% CI: 0.16-0.28), 43% (RR = 0.43; 95% CI: 0.36-0.50) and 75% (RR = 0.75; 95% CI: 0.67-0.83), respectively, of that among ethnic Danes (test for trend P < 0.0001). First-generation immigrants arriving in Denmark before age 15 years had a multiple sclerosis risk higher than that in their country of birth but lower than that in Denmark, reaching on average 69% of the multiple sclerosis risk among ethnic Danes (RR = 0.69; 95% CI: 0.55-0.87). Multiple sclerosis risk among individuals who came to Denmark at a later age remained closer to that of their country of birth, corresponding to 45% of the multiple sclerosis risk among ethnic Danes (RR = 0.45; 95% CI: 0.41-0.49). Our study supports the idea that environmental factors exerting their role in childhood or adolescence may be of aetiological relevance in multiple sclerosis.
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Affiliation(s)
- Nete Munk Nielsen
- Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark.,Focused Research Unit in Neurology; Department of Neurology, Hospital of Southern Jutland, University of Southern Denmark, Denmark
| | - Giulia Corn
- Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark
| | - Morten Frisch
- Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark
| | - Egon Stenager
- Focused Research Unit in Neurology; Department of Neurology, Hospital of Southern Jutland, University of Southern Denmark, Denmark.,The Danish Multiple Sclerosis Registry, Department of Neurology, Rigshospitalet, Copenhagen, Denmark.,Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark.,Multiple Sclerosis Clinic of Southern Jutland (Sønderborg, Kolding, Esbjerg), Department of Neurology, Sønderborg, Denmark.,National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark
| | - Nils Koch-Henriksen
- The Danish Multiple Sclerosis Registry, Department of Neurology, Rigshospitalet, Copenhagen, Denmark.,Department of Clinical Epidemiology, Clinical Institute, University of Aarhus, Aarhus, Denmark
| | - Jan Wohlfahrt
- Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark
| | - Melinda Magyari
- The Danish Multiple Sclerosis Registry, Department of Neurology, Rigshospitalet, Copenhagen, Denmark.,Danish Multiple Sclerosis Center, Department of Neurology, University of Copenhagen, Rigshospitalet, Copenhagen, Denmark
| | - Mads Melbye
- Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark.,Department of Medicine, Stanford University School of Medicine, Stanford CA USA 94305
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12
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Nguyen AL, Eastaugh A, van der Walt A, Jokubaitis VG. Pregnancy and multiple sclerosis: Clinical effects across the lifespan. Autoimmun Rev 2019; 18:102360. [PMID: 31401345 DOI: 10.1016/j.autrev.2019.102360] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Accepted: 04/17/2019] [Indexed: 01/10/2023]
Abstract
Multiple sclerosis (MS) is commonly diagnosed in women of childbearing age. Having a greater understanding of the effects of pregnancy on the course of MS will lead to improved family-planning counselling for women. We found well-established evidence for a protective effect of pregnancy on relapse occurrence in historical cohorts. More recent studies suggest that the protective effect of pregnancy against relapse may be lost in those women with more active disease treated with high efficacy therapies. Furthermore, a strong body of evidence suggests that gravidity after diagnosis of MS does not lead to worse long-term outcomes. More contentious however, is whether pregnancy can delay a first episode of demyelination or a confirmed diagnosis of MS. This review provides a detailed analysis of the literature relating to the clinical effects of pregnancy on MS outcomes across a woman's reproductive lifespan.
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Affiliation(s)
- Ai-Lan Nguyen
- Department of Medicine, University of Melbourne, Parkville, Australia; Department of Neurology, Royal Melbourne Hospital, Parkville, Australia.
| | - Alana Eastaugh
- Department of Neurology, Royal Melbourne Hospital, Parkville, Australia
| | - Anneke van der Walt
- Department of Medicine, University of Melbourne, Parkville, Australia; Department of Neurology, Royal Melbourne Hospital, Parkville, Australia; Department of Neuroscience, Central Clinical School, Monash University, Melbourne, Australia; Department of Neurology, MSNI Service, Alfred Health, Melbourne, Australia
| | - Vilija G Jokubaitis
- Department of Medicine, University of Melbourne, Parkville, Australia; Department of Neurology, Royal Melbourne Hospital, Parkville, Australia; Department of Neuroscience, Central Clinical School, Monash University, Melbourne, Australia; Department of Neurology, MSNI Service, Alfred Health, Melbourne, Australia
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13
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Hachim MY, Elemam NM, Maghazachi AA. The Beneficial and Debilitating Effects of Environmental and Microbial Toxins, Drugs, Organic Solvents and Heavy Metals on the Onset and Progression of Multiple Sclerosis. Toxins (Basel) 2019; 11:E147. [PMID: 30841532 PMCID: PMC6468554 DOI: 10.3390/toxins11030147] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 02/13/2019] [Accepted: 02/28/2019] [Indexed: 12/30/2022] Open
Abstract
Multiple sclerosis (MS), a chronic inflammatory disease of the central nervous system is common amongst young adults, leading to major personal and socioeconomic burdens. However, it is still considered complex and challenging to understand and treat, in spite of the efforts made to explain its etiopathology. Despite the discovery of many genetic and environmental factors that might be related to its etiology, no clear answer was found about the causes of the illness and neither about the detailed mechanism of these environmental triggers that make individuals susceptible to MS. In this review, we will attempt to explore the major contributors to MS autoimmunity including genetic, epigenetic and ecological factors with a particular focus on toxins, chemicals or drugs that may trigger, modify or prevent MS disease.
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Affiliation(s)
- Mahmood Y Hachim
- Department of Clinical Sciences, College of Medicine, and the Immuno-Oncology group, Sharjah Institute for Medical Research (SIMR), University of Sharjah, Sharjah P.O. Box 27272, United Arab Emirates.
| | - Noha M Elemam
- Department of Clinical Sciences, College of Medicine, and the Immuno-Oncology group, Sharjah Institute for Medical Research (SIMR), University of Sharjah, Sharjah P.O. Box 27272, United Arab Emirates.
| | - Azzam A Maghazachi
- Department of Clinical Sciences, College of Medicine, and the Immuno-Oncology group, Sharjah Institute for Medical Research (SIMR), University of Sharjah, Sharjah P.O. Box 27272, United Arab Emirates.
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14
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Abdollahpour I, Nedjat S, Salimi Y, Moradzadeh R, Mansournia MA, Sahraian MA, Shokoohi M. No association between socioeconomic status and risk of multiple sclerosis: A population-based incident case-control study in a developing country. Mult Scler Relat Disord 2018; 25:292-296. [DOI: 10.1016/j.msard.2018.08.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 08/16/2018] [Accepted: 08/21/2018] [Indexed: 12/31/2022]
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15
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Boesen MS, Koch-Henriksen N, Thygesen LC, Eriksson F, Greisen G, Born AP, Blinkenberg M, Uldall PV, Magyari M. Infections seem to be more frequent before onset of pediatric multiple sclerosis: A Danish nationwide nested case–control study. Mult Scler 2018; 25:783-791. [DOI: 10.1177/1352458518771871] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Background: Infections are suspected environmental triggers for multiple sclerosis (MS). The relationship between the timing and cumulative number of childhood infections regarding pediatric MS risk is uninvestigated. Objectives: To investigate whether childhood infections contribute to pediatric MS. Methods: A nationwide nested case–control study with detailed MS case ascertainment including chart review was undertaken. For each MS case, we selected five control children using density sampling from the entire Danish population, matching controls to children with MS by sex and birthdate. We analyzed data with the cumulative number of childhood infections as exposure and MS as outcome. Hazard ratios (HRs) including 95% confidence intervals (CIs) were estimated using Cox regression. Results: We identified 212 children with MS and 1,060 controls. Median age at MS onset was 15.3 years (range: 7.6–17.8 years); 72% were girls. Each infection during the preceding 3 years increased the hazard for MS by 11% (95% CI = 1.01–1.22, p = 0.04); having 5+ infections compared with 0–4 infections in the preceding 3 years doubled the hazard for MS (HR: 2.18; 95% CI = 1.12–4.30, p = 0.02). Conclusion: Children with MS appeared to have more infections in the 3 years preceding MS clinical onset; accordingly, immune response to infections may influence MS pathogenesis.
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Affiliation(s)
- Magnus Spangsberg Boesen
- Department of Paediatrics, Juliane Marie Center, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Nils Koch-Henriksen
- Department of Clinical Epidemiology, Clinical Institute, Aarhus University, Aarhus, Denmark/The Danish Multiple Sclerosis Registry, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Lau Caspar Thygesen
- National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark
| | - Frank Eriksson
- Section of Biostatistics, Department of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Gorm Greisen
- Department of Neonatology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Alfred Peter Born
- Department of Paediatrics, Juliane Marie Center, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Morten Blinkenberg
- Danish Multiple Sclerosis Center, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Peter Vilhelm Uldall
- Department of Paediatrics, Juliane Marie Center, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Melinda Magyari
- The Danish Multiple Sclerosis Registry, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark/Danish Multiple Sclerosis Center, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
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16
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Gustavsen S, Søndergaard HB, Oturai DB, Laursen B, Laursen JH, Magyari M, Ullum H, Larsen MH, Sellebjerg F, Oturai AB. Shift work at young age is associated with increased risk of multiple sclerosis in a Danish population. Mult Scler Relat Disord 2016; 9:104-9. [PMID: 27645354 DOI: 10.1016/j.msard.2016.06.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 05/30/2016] [Accepted: 06/25/2016] [Indexed: 12/24/2022]
Abstract
BACKGROUND Epidemiological studies suggest an important role for environmental factors in developing multiple sclerosis (MS). Furthermore several studies have indicated that the effect of environmental factors may be especially pronounced in adolescents. Recently only one study investigated and found that shift work at young age is associated with an increased risk of developing MS. In this study we focused on the effect of shift work in the vulnerable period between 15-19 years. OBJECTIVE The aim of this study was to investigate the association between shift work at young age and the risk of developing MS. METHODS We performed a large case-control study including 1723 patients diagnosed with MS and 4067 controls. MS patients were recruited from the Danish Multiple Sclerosis Biobank and controls from The Danish Blood Donor Study. Information on working patterns and lifestyle factors was obtained using a comprehensive lifestyle-environmental factor questionnaire with participants enrolled between 2009 and 2014. Logistic regression models were used to investigate the association between shift work at age 15-19 years and the subsequent risk of MS and were controlled for effects due to established MS risk factors. RESULTS We found a statistically significant association when total numbers of night shifts were compared with non-shift workers. For every additional 100 night shifts the odds ratio (OR) for MS was 1.20 (95% confidence interval (CI), 1.08-1.34, p=0.001). Increasing intensity of shift work also increased MS risk. For every additional night per month the OR was 1.04 (95% CI, 1.01-1.06, p=0.002). Duration of shift work in years was not associated with risk of MS. CONCLUSION This study supports a statistically significant association between shift work at age 15-19 years and MS risk.
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Affiliation(s)
- S Gustavsen
- Danish Multiple Sclerosis Center, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, Denmark.
| | - H B Søndergaard
- Danish Multiple Sclerosis Center, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, Denmark
| | - D B Oturai
- Danish Multiple Sclerosis Center, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, Denmark
| | - B Laursen
- The National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark
| | - J H Laursen
- Danish Multiple Sclerosis Center, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, Denmark
| | - M Magyari
- Danish Multiple Sclerosis Center, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, Denmark; The Danish Multiple Sclerosis Registry, Department of Neurology, Rigshospitalet, Copenhagen, Denmark
| | - H Ullum
- Department of Clinical Immunology, Center of Clinical Investigation, Copenhagen University Hospital, Denmark
| | - M H Larsen
- Department of Clinical Immunology, Center of Clinical Investigation, Copenhagen University Hospital, Denmark
| | - F Sellebjerg
- Danish Multiple Sclerosis Center, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, Denmark
| | - A B Oturai
- Danish Multiple Sclerosis Center, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, Denmark
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17
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Anaya JM, Ramirez-Santana C, Alzate MA, Molano-Gonzalez N, Rojas-Villarraga A. The Autoimmune Ecology. Front Immunol 2016; 7:139. [PMID: 27199979 PMCID: PMC4844615 DOI: 10.3389/fimmu.2016.00139] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Accepted: 03/29/2016] [Indexed: 12/21/2022] Open
Abstract
Autoimmune diseases (ADs) represent a heterogeneous group of disorders that affect specific target organs or multiple organ systems. These conditions share common immunopathogenic mechanisms (i.e., the autoimmune tautology), which explain the clinical similarities they have among them as well as their familial clustering (i.e., coaggregation). As part of the autoimmune tautology, the influence of environmental exposure on the risk of developing ADs is paramount (i.e., the autoimmune ecology). In fact, environment, more than genetics, shapes immune system. Autoimmune ecology is akin to exposome, that is all the exposures - internal and external - across the lifespan, interacting with hereditary factors (both genetics and epigenetics) to favor or protect against autoimmunity and its outcomes. Herein, we provide an overview of the autoimmune ecology, focusing on the immune response to environmental agents in general, and microbiota, cigarette smoking, alcohol and coffee consumption, socioeconomic status (SES), gender and sex hormones, vitamin D, organic solvents, and vaccines in particular. Inclusion of the autoimmune ecology in disease etiology and health will improve the way personalized medicine is currently conceived and applied.
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Affiliation(s)
- Juan-Manuel Anaya
- Center for Autoimmune Diseases Research (CREA), School of Medicine and Health Sciences, Universidad del Rosario , Bogotá , Colombia
| | - Carolina Ramirez-Santana
- Center for Autoimmune Diseases Research (CREA), School of Medicine and Health Sciences, Universidad del Rosario , Bogotá , Colombia
| | - Maria A Alzate
- Center for Autoimmune Diseases Research (CREA), School of Medicine and Health Sciences, Universidad del Rosario , Bogotá , Colombia
| | - Nicolas Molano-Gonzalez
- Center for Autoimmune Diseases Research (CREA), School of Medicine and Health Sciences, Universidad del Rosario , Bogotá , Colombia
| | - Adriana Rojas-Villarraga
- Center for Autoimmune Diseases Research (CREA), School of Medicine and Health Sciences, Universidad del Rosario , Bogotá , Colombia
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18
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Magyari M. Role of socio-economic and reproductive factors in the risk of multiple sclerosis. Acta Neurol Scand 2016; 132:20-3. [PMID: 26046554 DOI: 10.1111/ane.12426] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/15/2015] [Indexed: 11/27/2022]
Abstract
The incidence of multiple sclerosis is increasing in Danish women. Their risk of developing multiple sclerosis has more than doubled in 25 years while it has remained virtually unchanged for men. The explanation for these epidemiological changes should be sought in the environment as they are too rapid to be explained by gene alterations. We investigated the effect of numerous biological social physical and chemical environmental exposures in different periods of life. These data were available from population-based registries and were used in a case-control approach. This study database included all multiple sclerosis cases (n = 1403) from the Danish MS Registry with clinical onset between 2000 and 2004 as well as 35,045 controls drawn by random from the Danish Civil Registration System and matched by sex year of birth and residential municipality at the reference year. Having newborn children reduced the risk of multiple sclerosis (MS) in women but not in men. Childbirths reduced the risk of MS by about 46% during the following 5 years. Even pregnancies terminated early had a protective effect on the risk of developing MS suggesting a temporary immunosuppression during pregnancy. Our data on social behaviour regarding educational level income and relationship stability did not indicate reverse causality. A greater likelihood to be exposed to common infections did not show any effect on the risk of MS neither in puberty nor in adulthood. Socio-economic status and lifestyle expressed in educational level and sanitary conditions in youth were not associated with the risk of MS.
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Affiliation(s)
- M. Magyari
- Danish Multiple Sclerosis Centre; Department of Neurology; University of Copenhagen; Copenhagen Denmark
- Danish Multiple Sclerosis Registry; Neuroscience Centre; Rigshospitalet; University of Copenhagen; Copenhagen Denmark
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19
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Koch-Henriksen N, Magyari M, Laursen B. Registers of multiple sclerosis in Denmark. Acta Neurol Scand 2015; 132:4-10. [PMID: 26046552 DOI: 10.1111/ane.12424] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/10/2015] [Indexed: 01/07/2023]
Abstract
There are two nationwide population-based registers for multiple sclerosis (MS) in Denmark. The oldest register is The Danish Multiple Sclerosis Registry (DMSR), which is an epidemiological register for estimation of prevalence and incidence of MS and survival, and for identifying exposures earlier in life that may affect the risk of MS. This register has no systematic follow-up data except for survival. The DMSR has over the years published nationwide incidence- and prevalence data from Denmark and has been involved in a number of 'historical prospective' studies to elucidate the association between a number of different environmental exposures in the past and the subsequent risk of MS. Some of these studies have been able to exonerate suspected risk factors. The other register, the nationwide Danish Multiple Sclerosis Treatment Register, is a follow-up register for all patients who have received disease-modifying treatments since 1996. It has, in particular, contributed to the knowledge of the role of antibodies against the biological drugs used for the treatment of MS.
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Affiliation(s)
- N. Koch-Henriksen
- Department of Clinical Epidemiology; University of Aarhus; Aarhus Denmark
- The Danish Multiple Sclerosis Registry; Rigshospitalet; Copenhagen Denmark
| | - M. Magyari
- The Danish Multiple Sclerosis Registry; Rigshospitalet; Copenhagen Denmark
- Danish Multiple Sclerosis Center; Department of Neurology; Righospitalet; Copenhagen Denmark
| | - B. Laursen
- The National Institute of Public Health; University of Southern Denmark; Copenhagen Denmark
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20
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Tedeholm H, Skoog B, Lisovskaja V, Runmarker B, Nerman O, Andersen O. The outcome spectrum of multiple sclerosis: disability, mortality, and a cluster of predictors from onset. J Neurol 2015; 262:1148-63. [PMID: 25712541 DOI: 10.1007/s00415-015-7674-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 02/06/2015] [Accepted: 02/08/2015] [Indexed: 02/07/2023]
Abstract
Interest in the long-term natural history of multiple sclerosis (MS) is being revived, as disability endpoints become increasingly important with the advent of highly efficacious long range but potentially harmful drugs. MS had an increasingly benign course, probably due to better assessment and changing diagnostic criteria. Incidence cohorts reduce inclusion bias, capturing both extreme benign and severe cases. We conducted a 50-year follow-up of an incidence cohort of Gothenburg residents with MS onset in 1950-1964 (n = 254; 212 with an initial relapsing-remitting course and 42 with a monophasic course, diagnostic criteria according to Poser). Patients were followed longitudinally until censoring, death, or study termination in 2012 and evaluated using Kaplan-Meier estimates and Cox regression analysis. Median time to secondary progression was 15 years. Median time to EDSS6 and EDSS7 was 26 and 48 years (n = 254), respectively. The cumulative risk of reaching EDSS6 was 50% at 55 years of age and 80% at 80 years of age (n = 212). A score based on a cluster of clinical features at onset predicted secondary progression, EDSS6, EDSS7, and EDSS10 (hazard ratio 1.6-2.3 per score unit for women, 0.99-1.49 for men). This score predicted the disease course during five decades indirectly, by predicting time to secondary progression. Age at onset predicted the course in men, with 3-6% yearly increase in the risk of reaching disability milestones. The present incidence cohort provided hard outcome data in untreated patients over several decades.
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Affiliation(s)
- Helen Tedeholm
- Section of Clinical Neuroscience and Rehabilitation, Institute of Neuroscience and Physiology, the Sahlgrenska Academy, University of Gothenburg, Gröna Stråket 11, 3tr, Sahlgrenska Universitetssjukhuset, 413 45, Gothenburg, Sweden
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