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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Front+Microbiol
2018 ; 9
(ä): 1488
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Helicobacter pylori Infection Increased Anti-dsDNA and Enhanced Lupus Severity in
Symptomatic Fc?RIIb-Deficient Lupus Mice
#MMPMID30034379
Surawut S
; Panpetch W
; Makjaroen J
; Tangtanatakul P
; Thim-Uam A
; Wongphoom J
; Tumwasorn S
; Leelahavanichkul A
Front Microbiol
2018[]; 9
(ä): 1488
PMID30034379
show ga
The defect on Fc gamma receptor IIb (Fc?RIIb), the only inhibitory Fc?R, has been
identified as one of the genetic factors increasing susceptibility to lupus. The
prevalence of Helicobacter pylori (HP) and Fc?RIIb dysfunction-polymorphisms are
high among Asians, and their co-existence is possible. Unfortunately, the
influence of HP against lupus progression in patients with lupus is still
controversial. In this study, the interactions between these conditions were
tested with HP infection in 24-week-old Fc?RIIb-/- mice (symptomatic lupus). HP
induced failure to thrive, increased stomach bacterial burdens and stomach injury
(histology and cytokines) in both wild-type and Fc?RIIb-/- mice. While the
severity of HP infection, as determined by these parameters, was not different
between both strains, antibodies production (anti-HP, anti-dsDNA and serum
gammaglobulin) were higher in Fc?RIIb-/- mice compared to wild-type. Accordingly,
HP infection also accelerated the severity of lupus as determined by proteinuria,
serum creatinine, serum cytokines, renal histology, and renal immune complex
deposition. Although HP increased serum cytokines in both wild-type and
Fc?RIIb-/- mice, the levels were higher in Fc?RIIb-/- mice. As such, HP also
increased spleen weight and induced several splenic immune cells responsible for
antibody productions (activated B cell, plasma cell and follicular helper T cell)
in Fc?RIIb-/- mice, but not in wild-type. These data describe the different
systemic responses against localized HP infection from diverse host genetic
background. In conclusion, the mutual interactions between HP and lupus
manifestations of Fc?RIIb-/-mice were demonstrated in this study. With the
prominent immune responses from the loss of inhibitory signaling in Fc?RIIb-/-
mice, HP infection in these mice induced intense chronic inflammation, increased
antibody production, and enhanced lupus severity. Thus, the increased systemic
inflammatory responses due to localized HP inducing gastritis in some patients
with lupus may enhance lupus progression. More studies are needed.