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Comparison of Three Immunoassays for the Detection of Myositis Specific Antibodies
Conclusion: The data hold promise for advancements in standardization of MSA assays as well as for the potential inclusion of MSA in future classification criteria. Introduction Myositis specific (MSA) and myositis associated antibodies (MAA) have been used as an aid in the diagnosis of idiopathic inflammatory myopathies (IIM) for decades (1). Since many of the MSA (e.g., anti-synthetase antibodies), partly depending on the screening dilution, are accompanied by limited sensitivity of the indirect immunofluorescence (IIF) test, this method has limited utility as a screening test for suspected myositis (2–6)...
Source: Frontiers in Immunology - April 29, 2019 Category: Allergy & Immunology Source Type: research

Scurfy Mice Develop Features of Connective Tissue Disease Overlap Syndrome and Mixed Connective Tissue Disease in the Absence of Regulatory T Cells
Discussion Treg represent a lineage of T cells which play a fundamental role in maintaining humoral tolerance in the periphery. This subset of “suppressor T cells” is identified as FoxP3-expressing CD4+ T cells (16, 17). The unrestrained expression of FoxP3 is essential for the development and function of Treg (4). Accordingly, a disruption of the Foxp3 gene in scurfy mice results in an autoimmune lymphoproliferative disorder with fatal multi-organ inflammation (18). Since the causative mutation occurs in orthologous genes, the scurfy phenotype is indicated as the murine equivalent of the human IPEX sy...
Source: Frontiers in Immunology - April 23, 2019 Category: Allergy & Immunology Source Type: research

Anti-NT5c1A Autoantibodies as Biomarkers in Inclusion Body Myositis
Conclusions: Anti-NT5c1A has moderate sensitivity and high specificity for sIBM using ALBIA. The presence of anti-NT5c1A antibodies may be associated with muscle weakness. Anti-NT5c1A antibodies were not associated with a specific IIF staining pattern, hence screening using HEp-2 substrate is unlikely to be a useful predictor for presence of these autoantibodies. Introduction Sporadic Inclusion Body Myositis (sIBM) is one subset of idiopathic inflammatory myopathies (IIM) that is characterized by a clinical presentation of asymmetrical muscle involvement, predominantly affecting the long finger flexors, quadriceps mu...
Source: Frontiers in Immunology - April 8, 2019 Category: Allergy & Immunology Source Type: research