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- W2017303352 abstract "The role of natural killer (NK) cells in rheumatoid arthritis (RA) remains unclear. A pathogenetic function of rheumatoid factors (RF) also has not been defined. In the present studies, natural killer (NK) cells were examined as a model for Feγ receptor type III-positive (Feγ RIII+) cells, with regard to their interaction with RF. NK cell antigen CD16 (FcγRIII) and CD56 expression and functional NK and antibody-dependent cell-mediated cytotoxicity (ADCC) activity were compared in peripheral blood lymphocytes and autologous synovial fluid lymphocytes (SFL) of RA patients. Peripheral blood lymphocytes and SFL showed normal CD56 expression. In contrast, both the frequency and the density of CD16 antigen were decreased in SFL. Furthermore, diminished NK cytotoxicity and a significant decrease in ADCC were observed in SF NK cells. In subsequent in vitro studies with normal fresh NK cells, it was demonstrated that IgG-containing RF complexes from RA patients induced a modulation of FCγRIII structure from the NK cell surface, a decrease in NK activity, and a complete loss of ADCC. When purified RF was incubated with NK-enriched cell lines from RA patients, increased transcription and subsequent production of interferon-γ and tumor necrosis factor α were observed. These data suggest a direct involvement of RF complexes in the pathogenetic process of chronic inflammation in RA." @default.
- W2017303352 created "2016-06-24" @default.
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- W2017303352 date "1991-04-01" @default.
- W2017303352 modified "2023-09-27" @default.
- W2017303352 title "Activation of CD16+ effector cells by rheumatoid factor complex. Role of natural killer cells in rheumatoid arthritis" @default.
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- W2017303352 doi "https://doi.org/10.1002/art.1780340407" @default.
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