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2017 ; 7
(1
): 11334
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FCN1 (M-ficolin), which directly associates with immunoglobulin G1, is a
molecular target of intravenous immunoglobulin therapy for Kawasaki disease
#MMPMID28900133
Okuzaki D
; Ota K
; Takatsuki SI
; Akiyoshi Y
; Naoi K
; Yabuta N
; Saji T
; Nojima H
Sci Rep
2017[Sep]; 7
(1
): 11334
PMID28900133
show ga
Kawasaki disease (KD), an acute systemic vasculitis of early childhood, is of
unknown etiology. High-dose intravenous immunoglobulin (IVIG) is an effective
treatment, but its molecular target remains elusive. DNA microarray analysis of
peripheral blood mononuclear cells (PBMCs) revealed that at least 21 genes are
drastically down-regulated after IVIG treatment in most KD patients. qRT-PCR
analysis confirmed that the mRNA levels of five of these genes were considerably
reduced in almost all KD patients after IVIG treatment. Western blot (Wb) of PBMC
extracts revealed that levels of FCN1 (M-ficolin), a protein of the complement
system that defends against infectious agents, were reduced after IVIG treatment
in many KD patients. In another set of KD patients, Wb confirmed that levels of
both FCN1 were greatly reduced after IVIG therapy. Wb revealed that the
collagen-like domain of FCN1 directly bound to IgG1 in vitro through a portion of
the CH1 and CH3 domains, and synthetic peptides corresponding to these domains of
IgG1 efficiently inhibited these associations. These results suggest that FCN1 is
a molecular target of intravenous IVIG in KD patients. We propose that these
peptides and a humanized monoclonal antibody against FCN1 could be useful in
combination therapy with IVIG.
|*Immunoglobulins, Intravenous/therapeutic use
[MESH]