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Cited by 506

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Stimulation of T cell autoreactivity by anomalous expression of NKG2D and its MIC ligands in rheumatoid arthritis

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Groh, Veronika, Brühl, Anja, El-Gabalawy, Hani, Nelson, J. Lee, Spies, Thomas·2003·Proceedings of the National Academy of Sciences

Abstract

Effector T cell responses can be modulated by competing positive or negative signals transduced by natural killer (NK) cell receptors. This raises the possibility that dominant T cell stimulation might promote autoimmune reactions. In rheumatoid arthritis (RA), the severity of autoimmune and inflammatory joint disease correlates with large numbers of CD4 + CD28 – T cells, which are scarce in healthy individuals. For poorly defined reasons, these T cells are autoreactive, implying that they may contribute to disease manifestations. CD4 + CD28 – T cells in peripheral blood and synovial tissue of RA patients were found to express NKG2D, a costimulatory receptor that is absent on normal CD4 T cells. NKG2D was induced by tumor necrosis factor α and IL-15, which are abundant in inflamed synovia and RA patient sera. RA synoviocytes aberrantly expressed the stress-inducible MIC ligands of NKG2D, which stimulated autologous CD4 + CD28 – T cell cytokine and proliferative responses. Peripheral blood serum samples of RA patients contained substantial amounts of synoviocyte-derived soluble MICA, which failed to induce down-modulation of NKG2D because of the opposing activity of tumor necrosis factor α and IL-15. These results suggest that a profound dysregulation of NKG2D and its MIC ligands may cause autoreactive T cell stimulation, thus promoting the self-perpetuating pathology in RA and possibly other autoimmune diseases.

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Metadata

Authors
Groh, V., Brühl, A., El-Gabalawy, H., Nelson, J. L., & Spies, T.
Venue
Proceedings of the National Academy of Sciences
Published
2003-07-23
Volume
100
Issue
16
Pages
9452-9457
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2060387930
Cited by
506
References
34
FWCI
10.61
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Stimulation of T cell autoreactivity by anomalous expression of NKG2D and its MIC ligands in rheumatoid arthritis. https://app.cochat.ai/papers/10.1073/pnas.1632807100
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Groh, V., Brühl, A., El-Gabalawy, H., Nelson, J. L., & Spies, T. (2003). Stimulation of T cell autoreactivity by anomalous expression of NKG2D and its MIC ligands in rheumatoid arthritis. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1632807100

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