title: Spontaneous and in vitro activation of synovial fluid and peripheral blood lymphocytes in rheumatoid arthritis.
abstract: Peripheral blood (PB) and synovial fluid (SF) were compared in parallel samples in rheumatoid arthritis (RA). The kinetics of in vitro T-cell activation was assessed in phytohemagglutinin (PHA) stimulated PB or SF mononuclear cell cultures on days 0, 1, 3 and 5. The early lymphocyte activation as assessed by interleukin-2 receptor expression was faster in SF than in PB cell cultures. In particular, IFN-gamma secretion was higher in SF than in PB cell cultures (p less than 0.01). Accordingly, lymphocyte major histocompatibility complex (MHC) locus II antigen expression was higher in SF than in PB cell cultures (53 +/- 7% vs. 21 +/- 5%; p less than 0.01). Our results suggest that lymphocytes, which are particularly effective producers of IFN-gamma when stimulated in vitro are sequestered in the diseased joints in RA.
authors: Fourth Department of Medicine, Helsinki University Central Hospital, Finland.
authors: Y T
authors: YT
authors: Konttinen
authors: T
authors: T
authors: Pettersson
authors: P
authors: P
authors: Kemppinen
authors: C
authors: C
authors: Friman
mesh_terms: D000328:Adult; D000368:Aged; D015703:Antigens, CD / Q000032:analysis; D001172:Arthritis, Rheumatoid / Q000473:pathology / Q000503:physiopathology*; D001773:Blood Cells / Q000276:immunology / Q000502:physiology*; D005260:Female; D000949:Histocompatibility Antigens Class II / Q000032:analysis; D006801:Humans; D007371:Interferon-gamma / Q000378:metabolism; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000276:immunology / Q000378:metabolism / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D009000:Monocytes / Q000276:immunology; D010641:Phenotype; D010835:Phytohemagglutinins; D015375:Receptors, Interleukin-2 / Q000378:metabolism; D013582:Synovial Fluid / Q000166:cytology*
chemical_list: D015703:Antigens, CD; D000949:Histocompatibility Antigens Class II; D010835:Phytohemagglutinins; D015375:Receptors, Interleukin-2; D007371:Interferon-gamma