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2018 ; 5
(1
): e000259
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Accelerated model of lupus autoimmunity and vasculopathy driven by toll-like
receptor 7/9 imbalance
#MMPMID29765617
Liu Y
; Seto NL
; Carmona-Rivera C
; Kaplan MJ
Lupus Sci Med
2018[]; 5
(1
): e000259
PMID29765617
show ga
OBJECTIVES: Activation of endosomal toll-like receptor (TLR)7 or TLR9 has been
proposed as a critical step for the initiation and development of SLE.
Traditional spontaneous lupus models normally introduce multiple risk alleles,
thereby adding additional confounding factors. In the induced lupus models, the
role of TLR9 remains unclear. In the present study, we explored the role of an
imbalance between TLR7 and TLR9 pathways in the pathogenesis of lupus and its
associated vasculopathy using the imiquimod model in TLR9 KO/B6 background.
METHODS: Wild type (WT) and Tlr9(-/-) mice were epicutaneously treated with
imiquimod cream 5% on both ears three times per week for indicated times. At
euthanasia, mice were analysed for organ involvement, endothelium-dependent
vasorelaxation, serum autoantibodies, and innate and adaptive immune responses.
RESULTS: Compared with the lupus-like phenotype that develops in
imiquimod-treated WT mice, Tlr9(-/-) mice exposed to imiquimod have increased
severity of autoimmunity features and inflammatory phenotype that develops at
earlier stages. These abnormalities are characterised by enhanced TLR7 expression
and immune activation, increased immune complex deposition, Th1 T cells and
dendritic cell kidney infiltration and significant impairments in endothelial
function. Modulation of TLR7 expression was observed in the Tlr9(-/-) mice.
CONCLUSIONS: These findings further underscore the protective role of TLR9 in
TLR7-driven autoimmunity and also in the development of vasculopathy, further
strengthening the importance of tightly manipulating TLRs in putative therapeutic
strategies. This study provides a new model of accelerated lupus phenotype driven
by danger-associated molecular patterns.