Activation of murine autoreactive b cells by interleukin 1-like factors released from synovial inflammatory cells of rheumatoid arthritis patients.
The effect of interleukin 1 (IL-1)-like factor(s), produced by cells isolated from the synovial fluids of rheumatoid arthritis (RA) patients, on an in vitro murine model of spontaneous autoimmunity, i.e., the development of plaque-forming cells (PFC) to bromelain-treated mouse red blood cells (Br-MRBC) in mouse peritoneal cell (PC) cultures, has been investigated. It has been found that IL-1-containing culture supernatants from cells isolated from joint fluids of RA patients, as well as recombinant IL-1, determine a marked increase in anti-Br-MRBC PFC development. Moreover, factor(s) of 10-20 KD molecular weight, with IL-1-like biological activity, capable of increasing the anti-Br-MRBC PFC development in mouse PC cultures, have been demonstrated in joint fluids from RA patients. The finding that synovial inflammatory cells produce factors that activate autoreactive B cells further supports the role of autoimmunity in the pathogenesis of rheumatoid arthritis, as self-perpetuing disorder.
Institute of Medical Pathology, University of Pisa.
L
L
Bazzichi
A L
AL
Soletti
M L
ML
Ciompi
C
C
Garzelli
D000818:Animals; D001172:Arthritis, Rheumatoid / Q000276:immunology*; D015551:Autoimmunity; D001402:B-Lymphocytes / Q000276:immunology*; D002478:Cells, Cultured; D002850:Chromatography, Gel; D006462:Hemolytic Plaque Technique; D006801:Humans; D066298:In Vitro Techniques; D007375:Interleukin-1 / Q000096:biosynthesis*; D008070:Lipopolysaccharides; D008213:Lymphocyte Activation / Q000276:immunology; D051379:Mice; D008808:Mice, Inbred CBA; D013582:Synovial Fluid / Q000276:immunology*
D007375:Interleukin-1; D008070:Lipopolysaccharides