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2015 ; 181
(3
): 407-16
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Targeted IgA Fc receptor I (Fc?RI) therapy in the early intervention and
treatment of pristane-induced lupus nephritis in mice
#MMPMID25907714
Liu C
; Kanamaru Y
; Watanabe T
; Tada N
; Horikoshi S
; Suzuki Y
; Liu Z
; Tomino Y
Clin Exp Immunol
2015[Sep]; 181
(3
): 407-16
PMID25907714
show ga
The Fc receptor I for IgA (Fc?RI) down-regulates humoral immune responses and
modulates the risk of autoimmunity. This study aimed to investigate whether Fc?RI
targeting can affect progression of pristine-induced lupus nephritis. In the
first experiment (early intervention), four groups of animals were evaluated:
untreated Fc?RI/FcR? transgenic (Tg) mice and Tg mice administered control
antibody (Ctr Fab), saline and anti-Fc?RI Fab [macrophage inflammatory protein
(MIP)-8a], respectively, three times a week for 29 weeks, after being injected
once intraperitoneally with 0ˇ5 ml pristane. In the second experiment, antibody
injection started after the onset of nephritis and was carried out for 2 months,
with similar groups as described above. MIP-8a improved proteinuria, decreased
the amounts of glomerular injury markers, serum interleukin (IL)-6, IL-1 and
monocyte chemoattractant protein (MCP)-1, and F4/80 macrophages in the
interstitium and glomeruli, in both experiments. When MIP-8a was used as early
intervention, a decrease in mouse serum anti-nuclear antibody (ANA) titres and
reduced deposition of immunoglobulins in glomeruli were observed. This effect was
associated with reduced serum titres of immunoglobulin (Ig)G2a but not IgG1,
IgG2b and IgG3. Furthermore, pathological analysis showed lower glomerular
activity index and less fibronectin in MIP-8a treated mice. This study suggests
that Fc?RI targeting could halt disease progression and lupus activation by
selective inhibition of cytokine production, leucocyte recruitment and renal
inflammation. Our findings provide a basis for the use of Fc?RI as a molecular
target for the treatment of lupus.