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. 1997 Nov;110(2):250–256. doi: 10.1111/j.1365-2249.1997.tb08324.x

Specificities of anti-neutrophil autoantibodies in patients with rheumatoid arthritis (RA)

J BRIMNES *, P HALBERG *, S JACOBSEN *, A WIIK *, N H H HEEGAARD *
PMCID: PMC2265490  PMID: 9367409

Abstract

The objective of this study was to characterize antigens recognized by neutrophil-specific autoantibodies from patients with RA. Sera from 62 RA patients were screened by indirect immunofluorescence (IIF). Positive sera were further tested by ELISAs for antibodies against various granule proteins and by immunoblotting of electrophoretically separated cell, granule or nuclear extracts. Forty-two sera (68%) reacted with ethanol-fixed neutrophils. In the ELISAs 32% of the 28 medium to strongly IIF-positive sera were negative, while 43% were weakly positive for more than one antigen. Immunoblots of whole neutrophils showed IgG reactions at 25–35 kD, in the 55-kD region, at 80 kD, and at 110kD. Most sera reacted with more than one band. Except for the 55-kD antigen, none of the antigens appeared in lymphocytes. The most notable reactivity in subcellular fractions was with lactoferrin and with bands of 25–35 kD from nuclei. In conclusion, anti-neutrophil autoantibodies from RA patients recognize different antigens in the cytoplasm and in the nucleus. Lactoferrin is one of the common antigens recognized, but also unknown nuclear antigens of 25–35 kD mol. wt are involved.

Keywords: rheumatoid arthritis, autoantibodies, neutrophil autoantigens

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