Autoantibodies to C-reactive protein is a common finding in SLE, but not in primary Sjögren’s syndrome, rheumatoid arthritis or inflammatory bowel disease
2002 (English)In: Journal of Autoimmunity, ISSN 0896-8411, Vol. 19, no 3, 155-160 p.Article in journal (Refereed) Published
The occurrence of antibodies to human C-reactive protein (CRP) was analysed by enzyme-linked immunosorbent assay (ELISA) in 56 patient sera known to contain antibodies to double-stranded DNA (dsDNA) and in 16 sera from patients with primary Sjögren's syndrome (SS), 15 rheumatoid arthritis, 31 Crohn's disease, and 37 ulcerative colitis. Eighty-seven per cent of the patients with anti-dsDNA antibodies had systemic lupus erythematosus (SLE) and the remaining had autoimmune hepatitis. The cut-off for positive anti-CRP test was set at the 95th percentile of 100 healthy blood donors. Twenty of 56 anti-dsDNA sera (36%) and two of 16 SS sera (13%) had antibodies reactive with human CRP, whereas all other samples were negative. Thirteen of 27 SLE patients (48%) were positive on at least one occasion. The sera containing anti-CRP antibodies only reacted with surface-bound antigen, but not with native CRP in solution. In conclusion, we found that autoantibodies to CRP are common in sera from patients with anti-dsDNA antibodies. It is not likely that this explains the relative failure of CRP response in patients with active SLE. However, it cannot be excluded that anti-CRP autoantibodies have other biological potentials of pathophysiological interest in SLE, for instance by binding to CRP deposited on cell and tissue surfaces.
Place, publisher, year, edition, pages
2002. Vol. 19, no 3, 155-160 p.
Autoantibodies, C-reactive protein, rheumatoid arthritis, Sjögren's syndrome, systemic lupus erythematosus
National CategoryMedical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-13892DOI: 10.1006/jaut.2002.0608OAI: oai:DiVA.org:liu-13892DiVA: diva2:22136