title: Interleukin-1, interleukin-1 receptor antagonist and macrophage populations in rheumatoid arthritis synovial membrane.
abstract: To determine whether interleukin-1 (IL-1) and interleukin-1 receptor antagonist (IL-1ra) are produced by different macrophage subsets, we applied immunoperoxidase and double-labelling immunofluorescence techniques to 10 rheumatoid arthritis (RA) and 10 osteoarthritis (OA) synovial membranes. In RA, greater numbers of early 27E10+ macrophages were found in the sublining layer while mature 25F9+ macrophages were more abundant in the lining layers. The majority of IL-1alpha+ cells were also IL-1ra+ (79 +/- 12% sublining layer, 98 +/- 2% lining layer). In OA sublining layer, a higher percentage of cells double stained for 25F9 and IL-1ra was detected compared to those double stained for 25F9 and IL-1alpha (P < 0.004). In OA, 25F9+ macrophages demonstrated a lower percentage of IL-1alpha+ in the lining and sublining layers compared to RA (P < 0.02 and P < 0.004, respectively). It may be concluded that once monocytes have migrated into the RA joint, they undergo phenotypic and functional changes from an early profile (27E10+, CD14+, low percentage of IL-1+ and IL-1ra+ cells) to a mature profile (CD14+/-, 25F9+, RM3/1+, high percentage of IL-1+ and IL-1ra+ cells).
authors.affiliation: Division of Medicine, UMDS, Guy's Hospital, London.
authors.forename: A
authors.initials: A
authors.lastname: Cauli
authors.forename: G
authors.initials: G
authors.lastname: Yanni
authors.forename: G S
authors.initials: GS
authors.lastname: Panayi
mesh_terms: D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000276:immunology / Q000473:pathology*; D005260:Female; D005455:Fluorescent Antibody Technique; D006801:Humans; D016130:Immunophenotyping; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1 / Q000032:analysis*; D008264:Macrophages / Q000737:chemistry / Q000166:cytology* / Q000276:immunology; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000276:immunology / Q000473:pathology; D017472:Receptors, Interleukin-1 / Q000037:antagonists & inhibitors; D012795:Sialoglycoproteins / Q000032:analysis*; D013194:Staining and Labeling; D013583:Synovial Membrane / Q000737:chemistry* / Q000276:immunology / Q000473:pathology
chemical_list: C507763:IL1RN protein, human; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1; D017472:Receptors, Interleukin-1; D012795:Sialoglycoproteins