1
|
Galindo-Feria AS, Horuluoglu B, Day J, Fernandes-Cerqueira C, Wigren E, Gräslund S, Proudman S, Lundberg IE, Limaye V. Autoantibodies against Four-and-a-Half-LIM Domain 1 (FHL1) in Inflammatory Myopathies: Results from an Australian Single-Center Cohort. Rheumatology (Oxford) 2022; 61:4145-4154. [PMID: 35022656 PMCID: PMC9536793 DOI: 10.1093/rheumatology/keac003] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 01/04/2022] [Indexed: 11/13/2022] Open
Abstract
Objectives To determine the prevalence and associations of autoantibodies targeting a muscle-specific autoantigen, four-and-a-half-LIM-domain 1 (FHL1), in South Australian patients with histologically-confirmed idiopathic inflammatory myopathies (IIM) and in patients with SSc. Material and methods Sera from patients with IIM (n = 267) from the South Australian Myositis Database (SAMD), SSc (n = 174) from the Australian Scleroderma Cohort Study (ASCS) and healthy controls (HC, n = 100) were analysed for anti-FHL1 autoantibodies by Enzyme-Linked ImmunoSorbent Assay (ELISA). Results Autoantibodies to FHL1 were more frequent in patients with IIM (37/267, 13.8%) compared with SSc (12/174, 7%) (P < 0.02) and HC (2/100, 2%) (P < 0.001). The most common IIM subtypes among FHL1+ IIM patients were (32%) and IBM (2/37, 32%). No statistically significant differences in muscular or extra-muscular manifestations of IIM were found when comparing patients who were anti-FHL1+ with their anti-FHL1– counterparts. In 29/37 (78%) anti-FHL1+ patients, no myositis-specific autoantibodies (MSA) were present. In FHL1+ muscle biopsies, there was less frequent infiltration by CD45+ cells (P = 0.04). There was a trend for HLA alleles DRB1*07 and DRB1*15 to be more frequent in anti-FHL1+ compared with anti-FHL1– patients (9/25 vs 19/113, P = 0.09 and 8/25 vs 15/114, P = 0.09, respectively). Conclusions We report a substantial prevalence (13.8%) of anti-FHL1 autoantibodies in a large cohort of patients with histologically confirmed IIM; 75% of these cases did not have a detectable myositis-specific autoantibody. Anti-FHL1 autoantibodies were also detected in a subgroup of patients with SSc (7%), indicating that anti-FHL1 autoantibodies may not be myositis-specific. The trend towards an HLA-DR association might indicate a specific immune response to the FHL1 protein.
Collapse
Affiliation(s)
- Angeles S Galindo-Feria
- Division of Rheumatology, Department of Medicine, Solna, Karolinska Institutet, Stockholm, Sweden.,Center for Molecular Medicine, Karolinska University Hospital Solna, Stockholm, Sweden, Karolinska Institutet
| | - Begum Horuluoglu
- Division of Rheumatology, Department of Medicine, Solna, Karolinska Institutet, Stockholm, Sweden.,Center for Molecular Medicine, Karolinska University Hospital Solna, Stockholm, Sweden, Karolinska Institutet
| | - Jessica Day
- Rheumatology Unit, Royal Adelaide Hospital, Adelaide, Australia.,School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, Australia
| | - Catia Fernandes-Cerqueira
- Division of Rheumatology, Department of Medicine, Solna, Karolinska Institutet, Stockholm, Sweden.,Center for Molecular Medicine, Karolinska University Hospital Solna, Stockholm, Sweden, Karolinska Institutet.,4Dcell, Montreuil, France
| | - Edvard Wigren
- Division of Rheumatology, Department of Medicine, Solna, Karolinska Institutet, Stockholm, Sweden.,Structural Genomics Consortium, Rheumatology Unit, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden
| | - Susanne Gräslund
- Division of Rheumatology, Department of Medicine, Solna, Karolinska Institutet, Stockholm, Sweden.,Structural Genomics Consortium, Rheumatology Unit, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden
| | - Susanna Proudman
- Rheumatology Unit, Royal Adelaide Hospital, Adelaide, Australia.,Discipline of Medicine, University of Adelaide, Adelaide, Australia
| | - Ingrid E Lundberg
- Division of Rheumatology, Department of Medicine, Solna, Karolinska Institutet, Stockholm, Sweden.,Center for Molecular Medicine, Karolinska University Hospital Solna, Stockholm, Sweden, Karolinska Institutet
| | - Vidya Limaye
- Rheumatology Unit, Royal Adelaide Hospital, Adelaide, Australia.,Discipline of Medicine, University of Adelaide, Adelaide, Australia
| |
Collapse
|
2
|
Maundrell A, Proudman S, Limaye V. Prevalence of other connective tissue diseases in idiopathic inflammatory myopathies. Rheumatol Int 2019; 39:1777-1781. [PMID: 31385080 DOI: 10.1007/s00296-019-04411-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 07/31/2019] [Indexed: 01/06/2023]
Abstract
We sought to determine the prevalence of additional connective tissue diseases (CTDs) in patients with idiopathic inflammatory myopathies (IIM), and to study the muscle biopsy patterns in various clinico-serologic subsets of myositis. We undertook a retrospective cohort study of 648 patients with a histological diagnosis of IIM. The following was determined from the South Australian Myositis Database: presence of associated CTDs, histological details and presence of myositis-specific (MSA) or myositis-associated (MAA) antibodies. Among patients with IIM, a significantly greater proportion had systemic sclerosis 32/648 (4.9%) than mixed connective tissue disease (12/648, p = 0.003), primary Sjogren's syndrome (12/648, p = 0.003), systemic lupus erythematosus (10/648, p < 0.001) or rheumatoid arthritis (6/648, p = 0.0001). Polymyositis was the most common IIM diagnosis regardless of the presence or absence of CTD. MSA/MAA was more commonly detected in those with systemic sclerosis than those with IIM alone (OR 5.35, p < 0.005). The higher prevalence of SSc (compared with other CTDs) in IIM, together with the more frequent detection of autoantibodies in this group, suggests that these conditions may be linked.
Collapse
Affiliation(s)
- Adam Maundrell
- Rheumatologist, Rheumatology Tasmania, 4 Warneford St, Hobart, TAS, 7000, Australia
| | - Susanna Proudman
- Rheumatology Department, Royal Adelaide Hospital, Port Rd, Adelaide, SA, 5000, Australia.,Discipline of Medicine, University of Adelaide, North Tce, Adelaide, SA, 5000, Australia
| | - Vidya Limaye
- Rheumatology Department, Royal Adelaide Hospital, Port Rd, Adelaide, SA, 5000, Australia. .,Discipline of Medicine, University of Adelaide, North Tce, Adelaide, SA, 5000, Australia.
| |
Collapse
|
3
|
Waters MJ, Limaye V. Clinico-serologic features of statin-induced necrotising autoimmune myopathy in a single-centre cohort. Clin Rheumatol 2017; 37:543-547. [PMID: 28905130 DOI: 10.1007/s10067-017-3831-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 08/29/2017] [Accepted: 09/05/2017] [Indexed: 01/05/2023]
Abstract
Statin-induced necrotising autoimmune myopathy (NAM) is a rare but disabling complication of statin therapy. Data regarding treatment and outcomes in these patients is sparse. We retrospectively identified those patients with a diagnosis of statin-induced NAM who were managed in a single-tertiary referral centre from January 2014 to January 2017. Data regarding clinical features, serology, antibody status and functional outcome was collected. We identified 16 patients diagnosed with statin-induced NAM. Truncal weakness was present in 9/16 patients, of which one patient presented with camptocormia. Following treatment, the mean improvement in the 8-point manual muscle test (MMT8) score was 11 points (range 1-25). Antibodies to 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMGCR) were detected in 8/14 patients tested. Of patients who were HMGCR positive, 7/8 had significant truncal weakness, compared with 1/6 who were anti-HMGCR negative. In 4/7 patients who had anti-HMGCR retested following treatment, these antibodies subsequently became undetectable. The disappearance of anti-HMGCR was accompanied by sustained clinical improvement in all four patients. The mean Karnofsky Performance Status (KPS) prior to diagnosis was 89/100, and at latest follow-up had fallen to 68/100. We report a novel association of anti-HMGCR antibodies with truncal weakness in patients with statin-induced NAM. Functional impairments persist despite normalisation of muscle strength. Anti-HMGCR antibodies may disappear with treatment, paralleled by clinical remission of disease. Further prospective clinical trials are needed to determine optimal management strategies for statin-induced NAM.
Collapse
Affiliation(s)
- Michael J Waters
- Department of Neurology, Royal Adelaide Hospital, Adelaide, South Australia, 5000, Australia.
| | - Vidya Limaye
- Department of Rheumatology, Royal Adelaide Hospital, Adelaide, South Australia, 5000, Australia.,Discipline of Medicine, Adelaide University, Adelaide, South Australia, 5000, Australia
| |
Collapse
|
4
|
Limaye V, Smith C, Koszyca B, Blumbergs P, Otto S. Infections and vaccinations as possible triggers of inflammatory myopathies. Muscle Nerve 2017; 56:987-989. [DOI: 10.1002/mus.25628] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/19/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Vidya Limaye
- Department of RheumatologyRoyal Adelaide HospitalNorth Terrace, Adelaide South Australia5000 Australia
- Discipline of MedicineAdelaide UniversityNorth Terrace, Adelaide South Australia5000 Australia
| | | | | | - Peter Blumbergs
- Discipline of MedicineAdelaide UniversityNorth Terrace, Adelaide South Australia5000 Australia
| | - Sophia Otto
- SA PathologyAdelaide South Australia5000 Australia
| |
Collapse
|
5
|
Limaye VS, Lester S, Blumbergs P, Greenberg SA. Anti- C N1A antibodies in South Australian patients with inclusion body myositis. Muscle Nerve 2016; 53:654-5. [PMID: 26599102 DOI: 10.1002/mus.24989] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2015] [Revised: 09/04/2015] [Accepted: 11/23/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Vidya S Limaye
- Rheumatology Department, Royal Adelaide Hospital, Adelaide, South Australia, Australia
| | - Sue Lester
- Rheumatology Department, The Queen Elizabeth Hospital, Woodville South, South Australia, Australia
| | - Peter Blumbergs
- Neuropathology Department, Hanson Institute, Adelaide, South Australia, Australia
| | | |
Collapse
|
6
|
Maundrell A, Lester S, Rischmueller M, Hill C, Cleland LG, Blumbergs P, Wiese M, Limaye V. The PTPN22 gene is associated with idiopathic inflammatory myopathy. Muscle Nerve 2016; 55:270-273. [PMID: 27312665 DOI: 10.1002/mus.25222] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/14/2016] [Indexed: 12/27/2022]
Abstract
INTRODUCTION The aim of this study was to determine whether a single-nucleotide polymorphism (SNP; 1858CT, R620W) in the protein tyrosine phosphatase N22 (PTPN22) gene confers susceptibility to idiopathic inflammatory myopathy (IIM) in South Australian patients with IIM. METHODS Genotyping was performed on stored DNA from 199 patients with histologically confirmed polymyositis (PM), dermatomyositis (DM), and inclusion body myositis (IBM), and then compared with 455 matched controls. Associations with the 8.1 ancestral haplotype (AH), and myositis-specific (MSA) and myositis-associated (MAA) autoantibodies were investigated. RESULTS The PTPN22 R620W minor allele frequency was increased in IIM patients (50 of 398, 12.6%) compared with controls (75 of 910, 8.2%) (odds ratio 1.6, 95% confidence interval 1.1-2.3, P = 0.016). In IIM patients, there was no association between the R620W minor allele and detection of any MSA/MAA (P = 0.70), nor any evidence of epistasis with the 8.1 AH (P = 0.69). CONCLUSIONS The PTPN22 R620W minor allele is associated with susceptibility to IIM in SA patients, independent of the 8.1 AH. Muscle Nerve, 2016 Muscle Nerve 55: 270-273, 2017.
Collapse
Affiliation(s)
- Adam Maundrell
- Rheumatology Department, Royal Adelaide Hospital, North Terrace, Adelaide, South Australia, 5000, Australia
| | - Sue Lester
- Rheumatology Department, The Queen Elizabeth Hospital, Woodville South, South Australia, Australia
| | - Maureen Rischmueller
- Rheumatology Department, The Queen Elizabeth Hospital, Woodville South, South Australia, Australia
| | - Catherine Hill
- Rheumatology Department, The Queen Elizabeth Hospital, Woodville South, South Australia, Australia
| | - Leslie G Cleland
- Rheumatology Department, Royal Adelaide Hospital, North Terrace, Adelaide, South Australia, 5000, Australia
| | - Peter Blumbergs
- Tissue Pathology, South Australia Pathology, Adelaide, South Australia, Australia
| | - Michael Wiese
- School of Pharmacy and Medical Sciences and Sansom Institute for Health Research, University of South Australia, Adelaide, South Australia, Australia
| | - Vidya Limaye
- Rheumatology Department, Royal Adelaide Hospital, North Terrace, Adelaide, South Australia, 5000, Australia
| |
Collapse
|
7
|
Woodman R, Hakendorf P, Limaye V. Seasonality of birth patterns in an Australian cohort of patients with biopsy-confirmed idiopathic inflammatory myopathy. Intern Med J 2016; 46:619-21. [PMID: 27170240 DOI: 10.1111/imj.13061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2015] [Revised: 11/15/2015] [Accepted: 11/29/2015] [Indexed: 11/29/2022]
Abstract
Environmental exposures in the foetal period may predispose to autoimmunity. Aim of this study is to investigate whether seasonality in birth patterns exists in idiopathic inflammatory myopathies (IIM). We used Stata (StataCorp USA, version 13.0) and the user-written routine command 'circsummarise' to assess birth seasonality among South Australian patients with histologically confirmed IIM subsequent to 1980 using their date of birth. There was no evidence for a seasonal birth pattern among IIM patients overall (n = 568), however there were some ethnic variances in birth patterns among non-Caucasian patients. There was evidence for birth seasonality among both Aboriginal (mean = 7 July, Rayleigh P = 0.04) and Asian patients (mean = 12 August, Rayleigh P-value = 0.038). Non-Caucasians born in the third quarter of the calendar year may have an increased risk of developing IIM. Large international studies of IIM patients of diverse ethnicity are required to clarify the role of perinatal exposures in disease susceptibility.
Collapse
Affiliation(s)
- R Woodman
- Department of Epidemiology, Flinders University, Adelaide, South Australia, Australia
| | - P Hakendorf
- Clinical Epidemiology Unit, Flinders Medical Centre, Adelaide, South Australia, Australia
| | - V Limaye
- Rheumatology Department, Royal Adelaide Hospital, Adelaide, South Australia, Australia.,Discipline of Medicine, University of Adelaide, Adelaide, South Australia, Australia
| |
Collapse
|
8
|
Tieu J, Lundberg IE, Limaye V. Idiopathic inflammatory myositis. Best Pract Res Clin Rheumatol 2016; 30:149-68. [DOI: 10.1016/j.berh.2016.04.007] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 04/12/2016] [Accepted: 04/18/2016] [Indexed: 12/11/2022]
|
9
|
Dermatomyositis, polymyositis and immune-mediated necrotising myopathies. Biochim Biophys Acta Mol Basis Dis 2015; 1852:622-32. [DOI: 10.1016/j.bbadis.2014.05.034] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 05/18/2014] [Accepted: 05/20/2014] [Indexed: 12/11/2022]
|
10
|
Limaye V, Bundell C, Hollingsworth P, Rojana-Udomsart A, Mastaglia F, Blumbergs P, Lester S. Clinical and genetic associations of autoantibodies to 3-hydroxy-3-methyl-glutaryl-coenzyme a reductase in patients with immune-mediated myositis and necrotizing myopathy. Muscle Nerve 2015; 52:196-203. [PMID: 25521389 DOI: 10.1002/mus.24541] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/04/2014] [Indexed: 11/07/2022]
Abstract
INTRODUCTION Inhibition of 3-hydroxy-3-methyl-glutaryl-coenzyme A reductase (HMGCR) with statins may trigger idiopathic inflammatory myositis (IIM) or immune-mediated necrotizing myopathy (IMNM). Anti-HMGCR antibodies have been detected in patients with IIM/IMNM. We aimed to determine the associations of anti-HMGCR in IIM/IMNM. METHODS Anti-HMGCR antibodies were detected by ELISA in sera from patients with IIM/IMNM. RESULTS Anti-HMGCR antibodies were detected in 19 of 207 patients with IIM/IMNM, and there was a trend toward an association with male gender (P = 0.079). Anti-HMGCR antibodies were associated strongly with statin exposure (OR = 39, P = 0.0001) and HLA-DRB1*11 (OR = 50, P < 0.0001). The highest risk for development of anti-HMGCR antibodies was among HLA-DR11 carriers exposed to statins. Univariate analysis showed a strong association of anti-HMGCR antibodies with diabetes mellitus (P = 0.008), which was not confirmed by multiple regression. Among anti-HMGCR(+) patients there was a trend toward increased malignancy (P = 0.15). CONCLUSIONS Anti-HMGCR antibodies are seen in all subtypes of IIM and IMNM and are associated strongly with statin use and HLA-DR11. Muscle Nerve 52: 196-203, 2015.
Collapse
Affiliation(s)
- Vidya Limaye
- Rheumatology Department, Royal Adelaide Hospital, North Tce, Adelaide, South Australia SA, 5000, Australia.,Discipline of Medicine, Adelaide University, Adelaide, South Australia, Australia
| | - Chris Bundell
- PathWest Laboratory Medicine, Queen Elizabeth II Medical Centre, Perth, Western Australia, Australia
| | - Peter Hollingsworth
- PathWest Laboratory Medicine, Queen Elizabeth II Medical Centre, Perth, Western Australia, Australia.,Clinical Immunology, Sir Charles Gairdner Hospital
| | - Arada Rojana-Udomsart
- PathWest Laboratory Medicine, Queen Elizabeth II Medical Centre, Perth, Western Australia, Australia
| | - Frank Mastaglia
- West Australian Neuroscience Research Institute, Queen Elizabeth II Medical Centre, Perth, Western Australia, Australia
| | - Peter Blumbergs
- Discipline of Medicine, Adelaide University, Adelaide, South Australia, Australia
| | - Sue Lester
- Rheumatology Department, The Queen Elizabeth Hospital, Adelaide, South Australia, Australia
| |
Collapse
|
11
|
Limaye VS, Bonder CS, Sun WY, Lester S, Roberts-Thomson PJ, Blumbergs P. Levels of soluble adhesion molecules and their associations in inflammatory myositis. Int J Rheum Dis 2013; 16:99-101. [DOI: 10.1111/1756-185x.12039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Wai Y. Sun
- Vascular Biology and Cell Trafficking Laboratory; Human Immunology Centre for Cancer Biology; Adelaide; SA; Australia
| | - Susan Lester
- Rheumatology Department; The Queen Elizabeth Hospital; Woodville South; SA; Australia
| | | | - Peter Blumbergs
- Neuropathology Laboratory; Hanson Institute; Institute of Medical and Veterinary Science; Adelaide; SA; Australia
| |
Collapse
|
12
|
Current world literature. Curr Opin Rheumatol 2012; 24:694-702. [PMID: 23018859 DOI: 10.1097/bor.0b013e328359ee5b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
13
|
Rojana-udomsart A, Bundell C, James I, Castley A, Martinez P, Christiansen F, Hollingsworth P, Mastaglia F. Frequency of autoantibodies and correlation with HLA-DRB1 genotype in sporadic inclusion body myositis (s-IBM): A population control study. J Neuroimmunol 2012; 249:66-70. [DOI: 10.1016/j.jneuroim.2012.04.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2012] [Revised: 03/19/2012] [Accepted: 04/16/2012] [Indexed: 12/17/2022]
|
14
|
Limaye V, Luke C, Tucker G, Hill C, Lester S, Blumbergs P, Roberts-Thomson P. The incidence and associations of malignancy in a large cohort of patients with biopsy-determined idiopathic inflammatory myositis. Rheumatol Int 2012; 33:965-71. [PMID: 22833242 DOI: 10.1007/s00296-012-2489-y] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Accepted: 07/07/2012] [Indexed: 12/11/2022]
Abstract
The South Australian (SA) myositis database has registered all patients with biopsy-proven inflammatory myositis in SA from 1980 to 2009. We determined the incidence and associations of malignancy in myositis by linking this database with the SA cancer registry. Standardized incidence ratios (SIR) for malignancy were determined using the total SA population over the same time period, stratified by age and gender. The SIR for cancer in the myositis population (n = 373) was 1.39, p = 0.047. There was a trend towards an increased SIR in dermatomyositis but no increased risk of malignancy in polymyositis or inclusion body myositis. Malignancies of the lung and prostate were the commonest and 28 % of malignancies occurred within one year of IIM diagnosis. The odds of developing cancer were significantly raised in the presence of a shawl sign, male gender, and in patients with overlap syndrome or rheumatoid arthritis whilst myalgia was a significant protective factor. HLA-A28 allele was overrepresented in patients with malignancy (11 vs 2 %, p = 0.006). Patients in SA with myositis are at modestly increased risk for malignancy. We report clinical and genetic risk factors allowing the identification of patients at greatest risk for malignancy.
Collapse
Affiliation(s)
- Vidya Limaye
- Department of Rheumatology, Royal Adelaide Hospital, North Terrace, Adelaide, SA 5000, Australia.
| | | | | | | | | | | | | |
Collapse
|
15
|
TAN JA, ROBERTS-THOMSON PJ, BLUMBERGS P, HAKENDORF P, COX SR, LIMAYE V. Incidence and prevalence of idiopathic inflammatory myopathies in South Australia: a 30-year epidemiologic study of histology-proven cases. Int J Rheum Dis 2011; 16:331-8. [DOI: 10.1111/j.1756-185x.2011.01669.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
16
|
Salajegheh M, Lam T, Greenberg SA. Autoantibodies against a 43 KDa muscle protein in inclusion body myositis. PLoS One 2011; 6:e20266. [PMID: 21629782 PMCID: PMC3100335 DOI: 10.1371/journal.pone.0020266] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2011] [Accepted: 04/28/2011] [Indexed: 01/18/2023] Open
Abstract
Background Inclusion body myositis (IBM) is a poorly understood and refractory autoimmune muscle disease. Though widely believed to have no significant humoral autoimmunity, we sought to identify novel autoantibodies with high specificity for this disease. Methodology/Principal Findings Plasma autoantibodies from 65 people, including 25 with IBM, were analyzed by immunoblots against normal human muscle. Thirteen of 25 (52%) IBM patient samples recognized an approximately 43 kDa muscle protein. No other disease (N = 25) or healthy volunteer (N = 15) samples recognized this protein. Conclusions Circulating antibodies against a 43-kDa muscle autoantigen may lead to the discovery of a novel biomarker for IBM. Its high specificity for IBM among patients with autoimmune myopathies furthermore suggests a relationship to disease pathogenesis.
Collapse
Affiliation(s)
- Mohammad Salajegheh
- Department of Neurology, Brigham and Women's Hospital, Boston, Massachusetts, United States of America.
| | | | | |
Collapse
|