Heat shock protein 90 associates with Toll-like receptors 7/9 and mediates self-nucleic acid recognition in SLE - PubMed (original) (raw)
. 2015 Jul;45(7):2028-41.
doi: 10.1002/eji.201445293. Epub 2015 Apr 28.
Kazuharu Kukita 1 2, Goro Kutomi 2, Koichi Okuya 2, Hiroko Asanuma 1, Tetsuya Tabeya 3, Yasuka Naishiro 3, Motohisa Yamamoto 3, Hiroki Takahashi 3, Toshihiko Torigoe 1, Akira Nakai 4, Yasuhisa Shinomura 3, Koichi Hirata 2, Noriyuki Sato 1, Yasuaki Tamura 1 5
Affiliations
- PMID: 25871979
- DOI: 10.1002/eji.201445293
Free article
Heat shock protein 90 associates with Toll-like receptors 7/9 and mediates self-nucleic acid recognition in SLE
Keita Saito et al. Eur J Immunol. 2015 Jul.
Free article
Abstract
Systemic lupus erythematosus (SLE) is a prototype systemic autoimmune disease, and disease activity is associated with serum IFN-α level. Plasmacytoid dendritic cells (pDCs) sense microbial as well as self-nucleic acids by TLRs 7 and 9 and produce a large amount of IFN-α. Here, we show that heat shock protein 90 (Hsp90) associates with and delivers TLR7/9 from the ER to early endosomes for ligand recognition. Inhibition of Hsp90 by various approaches including the use of Hsp90 inhibitor, a geldanamycin derivative, suppressed the Hsp90 association with TLR7/9, which resulted in inhibition of IFN-α production, leading to improvement of SLE symptoms in mice. Notably, we observed that serum Hsp90 is clearly increased in patients with active SLE compared with that in patients with inactive disease. Furthermore, we demonstrated that serum Hsp90 detected in SLE patients binds to self-DNA and/or anti-DNA Ab, thus leading to stimulation of pDCs to produce IFN-α. Our data demonstrate that Hsp90 plays a crucial role in the pathogenesis of SLE and that an Hsp90 inhibitor will therefore provide a new therapeutic approach to SLE and other nucleic acid-related autoimmune diseases.
Keywords: Hsp90; IFN-α; Plasmacytoid DC; SLE; TLR.
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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