title: Levels of antibodies against C1q and 60 kDa family of heat shock proteins in the sera of patients with various autoimmune diseases.
abstract: Previously a strong positive correlation was found between antibodies to C1q (C1qAb) and antibodies against human heat shock protein (hsp60) and mycobacterial hsp65 in HIV infected patients. Here the levels of these antibodies were measured in the sera of patients with different autoimmune diseases (122 systemic lupus erythematosus (SLE), 55 systemic sclerosis, 33 undifferentiated connective tissue disease (UCTD), 27 primary Raynaud syndrome, 21 rheumatoid arthritis (RA), 14 polymyositis/dermatomyositis (PM/DM), and 192 healthy blood donors. The prevalence of IgG C1qAb was found to be high (P<0.0001 as compared to the healthy controls) only in the SLE group. The levels of the anti-hsp60 (P=0.0094) and anti-hsp65 (P=0.0108) antibodies were high only in the UCTD patients. No correlation was found between the C1qAb and anti-hsp antibodies in any group except a significant (P=0.011) positive correlation between C1qAb and hsp65 antibodies in the patients with UCTD. These findings indicate that the autoantibodies against C1q are heterogeneous: in different diseases different types of C1qAb may dominate.
authors.affiliation: 3rd Department of Medicine, Faculty of Medicine, Semmelweis University, Kútvölgyi út 4, H-1125, Budapest, Hungary.
authors.forename: L
authors.initials: L
authors.lastname: Horváth
authors.forename: L
authors.initials: L
authors.lastname: Czirják
authors.forename: B
authors.initials: B
authors.lastname: Fekete
authors.forename: L
authors.initials: L
authors.lastname: Jakab
authors.forename: Z
authors.initials: Z
authors.lastname: Prohászka
authors.forename: L
authors.initials: L
authors.lastname: Cervenak
authors.forename: L
authors.initials: L
authors.lastname: Romics
authors.forename: M
authors.initials: M
authors.lastname: Singh
authors.forename: M R
authors.initials: MR
authors.lastname: Daha
authors.forename: G
authors.initials: G
authors.lastname: Füst
mesh_terms: D000328:Adult; D000907:Antibodies, Bacterial / Q000097:blood; D001172:Arthritis, Rheumatoid / Q000276:immunology; D001323:Autoantibodies / Q000097:blood*; D001327:Autoimmune Diseases / Q000276:immunology*; D001426:Bacterial Proteins / Q000276:immunology; D016022:Case-Control Studies; D018834:Chaperonin 60 / Q000276:immunology*; D018833:Chaperonins / Q000276:immunology; D015922:Complement C1q / Q000276:immunology*; D003240:Connective Tissue Diseases / Q000276:immunology; D003429:Cross Reactions; D005260:Female; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood; D008180:Lupus Erythematosus, Systemic / Q000276:immunology; D008297:Male; D008875:Middle Aged; D011928:Raynaud Disease / Q000276:immunology; D012595:Scleroderma, Systemic / Q000276:immunology
chemical_list: D000907:Antibodies, Bacterial; D001323:Autoantibodies; D001426:Bacterial Proteins; D018834:Chaperonin 60; D007074:Immunoglobulin G; C074119:heat-shock protein 65, Mycobacterium; D015922:Complement C1q; D018833:Chaperonins