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2015 ; 2015
(ä): 369462
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English Wikipedia
Nonbilayer Phospholipid Arrangements Are Toll-Like Receptor-2/6 and TLR-4
Agonists and Trigger Inflammation in a Mouse Model Resembling Human Lupus
#MMPMID26568960
Wong-Baeza C
; Tescucano A
; Astudillo H
; Reséndiz A
; Landa C
; España L
; Serafín-López J
; Estrada-García I
; Estrada-Parra S
; Flores-Romo L
; Wong C
; Baeza I
J Immunol Res
2015[]; 2015
(ä): 369462
PMID26568960
show ga
Systemic lupus erythematosus is characterized by dysregulated activation of T and
B cells and autoantibodies to nuclear antigens and, in some cases, lipid
antigens. Liposomes with nonbilayer phospholipid arrangements induce a disease
resembling human lupus in mice, including IgM and IgG antibodies against
nonbilayer phospholipid arrangements. As the effect of these liposomes on the
innate immune response is unknown and innate immune system activation is
necessary for efficient antibody formation, we evaluated the effect of these
liposomes on Toll-like receptor (TLR) signaling, cytokine production,
proinflammatory gene expression, and T, NKT, dendritic, and B cells. Liposomes
induce TLR-4- and, to a lesser extent, TLR-2/TLR-6-dependent signaling in
TLR-expressing human embryonic kidney (HEK) cells and bone marrow-derived
macrophages. Mice with the lupus-like disease had increased serum concentrations
of proinflammatory cytokines, C3a and C5a; they also had more TLR-4-expressing
splenocytes, a higher expression of genes associated with TRIF-dependent
TLR-4-signaling and complement activation, and a lower expression of
apoptosis-related genes, compared to healthy mice. The percentage of NKT and the
percentage and activation of dendritic and B2 cells were also increased. Thus,
TLR-4 and TLR-2/TLR-6 activation by nonbilayer phospholipid arrangements triggers
an inflammatory response that could contribute to autoantibody production and the
generation of a lupus-like disease in mice.