Identification of a novel autoantibody against self-vimentin specific in secondary Sjögren’s syndrome

Abstract

BackgroundSjögren’s syndrome (SS) is a primary autoimmune disease (pSS) or secondarily associated with other autoimmune diseases (sSS). The mechanisms underlying immune dysregulation in this syndrome remain unknown, and clinically it is difficult to diagnose owing to a lack of specific biomarkers.MethodsWe extracted immunoglobulins (Igs) from the sera of patients with sSS associated with rheumatoid arthritis (RA) and used them to screen a phage display library of peptides with random sequences.ResultsOur results show that an sSS-specific peptide, designated 3S-P, was recognized by sera of 68.2% (60 of 88) patients with sSS, 66.2% of patients with RA-sSS, and 76.5% of patients with systemic lupus erythematosus (SLE)-sSS. The anti-3S-P antibody was scarcely found in patients with pSS (1.8%), RA (1.3%), SLE (4.2%), ankylosing spondylitis (0%), and gout (3.3%), as well as in healthy donors (2%). The 3S-P-binding Igs (antibodies) were used to identify antigens from salivary glands and synovial tissues from patients with sSS. A putative target autoantigen expressed in the synovium and salivary gland recognized by anti-3S-P antibody was identified as self-vimentin.ConclusionsThis novel autoantibody is highly specific in the diagnosis of sSS, and the underlying molecular mechanism of the disease might be epitope spreading involved with vimentin.Electronic supplementary materialThe online version of this article (doi:10.1186/s13075-017-1508-5) contains supplementary material, which is available to authorized users.

<p>Sj&ouml;gren&#39;s syndrome and systemic lupus erythematosus: links and risks</p>

“…In addition to the usual autoantibodies, a novel reactivity appears to be promising for the differential diagnosis between pSS and sSS. The anti-self-vimentin specific antibody (anti-3S-P) was detected in 68.2% sera from sSS patients (66.2% with sSS-RA and 76.5% with sSS-SLE), and only in 1.8% of pSS, 1.3% of RA, and 4.2% of SLE patients 87…”

Oral Lichen Planus and Lichenoid Lesions in Sjogren’s Syndrome Patients: A Prospective Study

“…Sjögren's syndrome (SS) is a systemic autoimmune disease characterized by marked reduction of exocrine glandular secretions and by its progression to lymphocytic infiltration and destruction [1].…”

Poria Acid, Triterpenoids Extracted from Poria cocos, Inhibits the Invasion and Metastasis of Gastric Cancer Cells

“…Specifically, the downregulation of E-cadherin could be balanced by the increased expression of N-cadherin [ 35 , 36 ]. Vimentin, as a typical marker, can regulate a variety of cell types involved in cell migration and enhance cell invasiveness [ 37 , 38 ]. This study showed that PA increased the expression of E-cadherin and decreased the expression of N-cadherin and Vimentin.…”