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2017 ; 8
(ä): 651
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TWEAK/Fn14 Activation Participates in Ro52-Mediated Photosensitization in
Cutaneous Lupus Erythematosus
#MMPMID28620393
Liu Y
; Xu M
; Min X
; Wu K
; Zhang T
; Li K
; Xiao S
; Xia Y
Front Immunol
2017[]; 8
(ä): 651
PMID28620393
show ga
Tumor necrosis factor (TNF)-like weak inducer of apoptosis (TWEAK) binds to its
sole receptor fibroblast growth factor-inducible 14 (Fn14), participating in
various inflammatory responses. Recently, TWEAK/Fn14 activation was found
prominent in the lesions of cutaneous lupus erythematosus (CLE). This study was
designed to further reveal the potential role of this pathway in Ro52-mediated
photosensitization. TWEAK, Fn14, and Ro52 were determined in the skin lesions of
patients with CLE. Murine keratinocytes received ultraviolet B (UVB) irradiation
or plus TWEAK stimulation and underwent detection for Ro52 and proinflammatory
cytokines. The chemotaxis of J774.2 macrophages was evaluated on TWEAK
stimulation of cocultured keratinocytes. We found that TWEAK, Fn14, and
downstream cytokines were highly expressed in CLE lesions that overexpressed
Ro52. Moreover, TWEAK enhanced the UVB-induced Ro52 upregulation in murine
keratinocytes. Meanwhile, TWEAK stimulation of keratinocytes favored the
migration of macrophages through promoting the production of chemokine C-C motif
ligands 17 and 22. Furthermore, Fn14 siRNA transfection or nuclear factor-kappa B
(NF-?B) inhibitor abrogated the TWEAK enhancement of Ro52 expression in
keratinocytes. Similarly, TNF receptor associated factor 2 (TRAF2) siRNA reduced
the protein level of Ro52 in these cells upon TWEAK stimulation. Interestingly,
UVB irradiation increased the expression of TNF receptor type 1 (TNFR1) but not
affecting TNFR2 expression in keratinocytes. In conclusion, the TWEAK/Fn14
signaling participates in Ro52-mediated photosensitization and involves the
activation of NF-?B pathway as well as the function of the TRAF2/TNFR partners.