title: Expression of inactive stage anti-dsDNA idiotypes on anti-ssDNA antibodies in a lupus patient during active stage of lupus cerebritis.
abstract: The possibility that idiotypes (Ids) defined on anti-double stranded DNA (dsDNA) antibodies during active and inactive stages of lupus (1/84 Id and 4/90 Id, respectively) were expressed on anti-DNA antibodies during a subsequent active period (9/90) of the disease was investigated in a lupus patient with lupus cerebritis. Using rabbit (R)-anti-Ids specific to 1/84 Id and 4/90 Id in inhibition assays, the 4/90 Id was shown to be expressed on the framework regions of anti-single stranded DNA (ssDNA) but poorly on co-existing anti-dsDNA antibodies of active (9/90) stage. The 1/84 Id was poorly expressed on both types of 9/90 anti-DNA antibodies. While the 9/90 anti-ssDNA significantly bound to immobilized ssDNA and several single-stranded polynucleotides, only ssDNA inhibited the binding of the anti-ssDNA to ssDNA, suggesting its monospecificity toward ssDNA. Western blot analysis following isoelectric focusing showed that a spectrotype pattern of 4/90 Id-positive 9/90 anti-ssDNA IgG was similar to that of the 4/90 anti-dsDNA, suggesting that they are of related clonal origin. The present study suggests the idiotypic heterogeneity of anti-DNA antibodies and the shift of antigen specificity within an idiotypically related anti-DNA population during exacerbation of the disease.
authors.affiliation: Immunology Research Laboratory, St. Luke's Hospital, Kansas City, MO 64111.
authors.forename: R
authors.initials: R
authors.lastname: Suenaga
authors.forename: N I
authors.initials: NI
authors.lastname: Abdou
mesh_terms: D000818:Animals; D000974:Antibodies, Antinuclear / Q000096:biosynthesis* / Q000276:immunology; D000918:Antibody Specificity; D001327:Autoimmune Diseases / Q000150:complications / Q000276:immunology*; D003429:Cross Reactions; D004247:DNA / Q000276:immunology*; D004277:DNA, Single-Stranded / Q000276:immunology; D005260:Female; D006801:Humans; D007130:Immunoglobulin Idiotypes / Q000276:immunology*; D008180:Lupus Erythematosus, Systemic / Q000150:complications / Q000276:immunology*; D019965:Neurocognitive Disorders / Q000209:etiology / Q000276:immunology*; D011119:Polynucleotides / Q000138:chemical synthesis / Q000276:immunology; D011817:Rabbits; D012640:Seizures / Q000209:etiology / Q000276:immunology*
chemical_list: D000974:Antibodies, Antinuclear; D004277:DNA, Single-Stranded; D007130:Immunoglobulin Idiotypes; D011119:Polynucleotides; D004247:DNA