Reactivity with dichotomous determinants of Ro 60 stratifies autoantibody responses in lupus and primary Sjögren's syndrome

Arthritis and Rheumatism
Joanne H ReedTom P Gordon

Abstract

Analysis of B cell determinants of Ro 60 exposed on the surface of apoptotic cells (apotopes) or intracellular epitopes provides insight into the structural forms of the autoantigen that break immune tolerance. This study was initiated to compare anti-Ro 60 responses in systemic lupus erythematosus (SLE) and primary Sjögren's syndrome (SS) against membrane-bound and intracellular forms of Ro 60. The reactivity of autoantibodies from patients with SLE and primary SS to Ro 60 apotopes and epitopes was assessed by multiparameter flow cytometry and solid-phase immunoassay. Anti-Ro 60 IgG was eluted from early apoptotic cells or recombinant Ro 60 immobilized on nitrocellulose, and binding to membrane-bound and intracellular forms of Ro 60 was quantitated by flow cytometry. An immunodominant apotope, which was recognized by IgG from a subset of SLE patients with anti-Ro, but not anti-La, autoantibodies, was mapped to a region forming a helix-loop-helix at the apical tip of the Ro 60 molecule. Immobilization of this region to the solid phase exposed an epitope that was recognized by IgG from primary SS and SLE patients whose sera had both anti-Ro and anti-La autoantibodies. Autoantibodies eluted from either the surface of apoptotic ce...Continue Reading

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Citations

Feb 20, 2013·Nature Reviews. Rheumatology·John J O'SheaIain B McInnes
Feb 19, 2011·Current Opinion in Rheumatology·William StohlMichael P Cancro
Aug 9, 2015·Annals of the Rheumatic Diseases·David F FiorentinoLivia Casciola-Rosen
May 24, 2011·The Journal of Immunology : Official Journal of the American Association of Immunologists·Joanne H ReedJill P Buyon

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