title: Increased IL-1 receptor antagonist (IL-1ra) production and decreased IL-1 beta/IL-1ra ratio in mononuclear cells from rheumatoid arthritis patients.
abstract: In order to investigate the possible role of IL-1 receptor antagonist (IL-1ra) in patients with rheumatoid arthritis (RA), this study was undertaken to measure the amounts of IL-1ra and interleukin-1 beta (IL-1 beta) protein produced by mononuclear cells (MNC) and to investigate the relationship between production of these cytokines and clinical parameters. The MNC were cultured for 24 h and the supernatants were measured for IL-1ra and IL-1 beta by ELISA kits. MNC from peripheral blood (PB) and synovial fluid of RA patients produced significantly higher amounts of IL-1ra than normal PBMNC (P < 0.01 and P < 0.05, respectively). When the IL-1 beta/IL-1ra ratio was calculated, IL-1 beta/IL-1ra ratios of RA PBMNC were significantly lower than those of normal PBMNC (P < 0.001). The IL-1 beta/IL-1ra ratio of RA PBMNC was significantly higher in active RA patients than in RA patients in remission (P < 0.02). The amounts of IL-1ra produced by stimulated RA PBMNC positively correlated with the joint score (P < 0.05), serum CRP levels (P < 0.05) and the amounts of IL-1 beta produced (P < 0.01). The amounts of IL-1ra produced by unstimulated RA PBMNC did not correlate with any of the clinical parameters studied. Gold sodium thiomalate (GST), but not auranofin, increased IL-1ra production in vitro.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Clinical Immunology, Kyushu University, Beppu, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Shingu
authors.forename: Y
authors.initials: Y
authors.lastname: Fujikawa
authors.forename: T
authors.initials: T
authors.lastname: Wada
authors.forename: S
authors.initials: S
authors.lastname: Nonaka
authors.forename: M
authors.initials: M
authors.lastname: Nobunaga
mesh_terms: D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000150:complications / Q000188:drug therapy / Q000378:metabolism*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006052:Gold Sodium Thiomalate / Q000627:therapeutic use; D006801:Humans; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1 / Q000378:metabolism*; D015847:Interleukin-4 / Q000494:pharmacology; D007963:Leukocytes, Mononuclear / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D012795:Sialoglycoproteins / Q000187:drug effects / Q000378:metabolism*; D013582:Synovial Fluid / Q000166:cytology
chemical_list: C507763:IL1RN protein, human; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1; D012795:Sialoglycoproteins; D006052:Gold Sodium Thiomalate; D015847:Interleukin-4