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    Toll-like receptor 9-dependent and -independent dendritic cell activation by chromatin-immunoglobulin G complexes

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    Author
    Boule, MW; Broughton, C; Mackay, F; Akira, S; Marshak-Rothstein, A; Rifkin, IR
    Date
    2004-06-21
    Source Title
    Journal of Experimental Medicine
    Publisher
    ROCKEFELLER UNIV PRESS
    University of Melbourne Author/s
    Mackay, Fabienne
    Affiliation
    Microbiology and Immunology
    Metadata
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    Document Type
    Journal Article
    Citations
    Boule, M. W., Broughton, C., Mackay, F., Akira, S., Marshak-Rothstein, A. & Rifkin, I. R. (2004). Toll-like receptor 9-dependent and -independent dendritic cell activation by chromatin-immunoglobulin G complexes. JOURNAL OF EXPERIMENTAL MEDICINE, 199 (12), pp.1631-1640. https://doi.org/10.1084/jem.20031942.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/257071
    DOI
    10.1084/jem.20031942
    Abstract
    Dendritic cell (DC) activation by nucleic acid-containing immunoglobulin (Ig)G complexes has been implicated in systemic lupus erythematosus (SLE) pathogenesis. However, the mechanisms responsible for activation and subsequent disease induction are not completely understood. Here we show that murine DCs are much more effectively activated by immune complexes that contain IgG bound to chromatin than by immune complexes that contain foreign protein. Activation by these chromatin immune complexes occurs by two distinct pathways. One pathway involves dual engagement of the Fc receptor FcgammaRIII and Toll-like receptor (TLR)9, whereas the other is TLR9 independent. Furthermore, there is a characteristic cytokine profile elicited by the chromatin immune complexes that distinguishes this response from that of conventional TLR ligands, notably the induction of BAFF and the lack of induction of interleukin 12. The data establish a critical role for self-antigen in DC activation and explain how the innate immune system might drive the adaptive immune response in SLE.

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