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* Division of Medicine, Imperial College London, London, United Kingdom;
Medical Research Council Human Immunology Unit, John Radcliffe Hospital, Oxford, United Kingdom;
Nuffield Orthopedic Center, Oxford, United Kingdom; and
Oxford Pleural Disease Clinic, Oxford Radcliffe Hospital, Oxford, United Kingdom
Human NK cells may be divided into a CD56dim subset and a CD56bright subset. In peripheral blood, CD56dim NK cells dominate, whereas in lymph nodes, CD56bright NK cells are more common. In this study we show that CD56bright NK cells accumulate within inflammatory lesions in a wide variety of clinical diseases affecting several different anatomical sites. We demonstrate that when activated by the monokines IL-12, IL-15, and IL-18, these NK cells promote TNF-
production by CD14+ monocytes in a manner that is dependent on cell:cell contact. Conversely, CD14+ monocytes synergize with monokines to promote IFN-
production by these NK cells. Again, this interaction is dependent on cell:cell contact. The experiments show that CD56bright NK cells accumulate in inflammatory lesions and, in the appropriate cytokine environment, can engage with CD14+ monocytes in a reciprocal activatory fashion, thereby amplifying the inflammatory response. Such a positive feedback loop is likely to be important in the pathogenesis of chronic inflammatory conditions such as rheumatoid arthritis.
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