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2017 ; 176
(ä): 12-22
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Estrogen-regulated STAT1 activation promotes TLR8 expression to facilitate
signaling via microRNA-21 in systemic lupus erythematosus
#MMPMID28039018
Young NA
; Valiente GR
; Hampton JM
; Wu LC
; Burd CJ
; Willis WL
; Bruss M
; Steigelman H
; Gotsatsenko M
; Amici SA
; Severin M
; Claverie LM
; Guerau-de-Arellano M
; Lovett-Racke A
; Ardoin S
; Jarjour WN
Clin Immunol
2017[Mar]; 176
(ä): 12-22
PMID28039018
show ga
Recent studies implicate innate immunity to systemic lupus erythematosus (SLE)
pathogenesis. Toll-like receptor (TLR)8 is estrogen-regulated and binds viral
ssRNA to stimulate innate immune responses, but recent work indicates that
microRNA (miR)-21 within extracellular vesicles (EVs) can also trigger this
receptor. Our objective was to examine TLR8 expression/activation to better
understand sex-biased responses involving TLR8 in SLE. Our data identify an
estrogen response element that promotes STAT1 expression and demonstrate
STAT1-dependent transcriptional activation of TLR8 with estrogen stimulation. In
lieu of viral ssRNA activation, we explored EV-encapsulated miR-21 as an
endogenous ligand and observed induction of both TLR8 and cytokine expression in
vitro. Moreover, extracellular miR detection was found predominantly within EVs.
Thus, just as a cytokine or chemokine, EV-encapsulated miR-21 can act as an
inflammatory signaling molecule, or miRokine, by virtue of being an endogenous
ligand of TLR8. Collectively, our data elucidates a novel innate inflammatory
pathway in SLE.