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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 Ann+Rheum+Dis
2016 ; 75
(3
): 617-22
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Interaction between innate immunity and Ro52-induced antibody causes Sjögren s
syndrome-like disorder in mice
#MMPMID25906316
Szczerba BM
; Kaplonek P
; Wolska N
; Podsiadlowska A
; Rybakowska PD
; Dey P
; Rasmussen A
; Grundahl K
; Hefner KS
; Stone DU
; Young S
; Lewis DM
; Radfar L
; Scofield RH
; Sivils KL
; Bagavant H
; Deshmukh US
Ann Rheum Dis
2016[Mar]; 75
(3
): 617-22
PMID25906316
show ga
OBJECTIVES: Autoantibodies reactive with Ro52 are often found in sera of patients
with Sjögren's syndrome (SS). This study was undertaken to investigate the role
of Ro52-induced immune responses in pathogenesis of SS. METHODS: New Zealand
Mixed (NZM) 2758 mice were immunised with Ro52 in alum adjuvant. Control mice
were immunised either with maltose-binding protein or injected with alum alone.
Mice were monitored for anti-Ro52 antibody, sialoadenitis and pilocarpine-induced
salivation. Antibody binding to salivary gland (SG) cells was analysed in vivo
and in vitro by immunofluorescence. Sera from immunised mice were passively
transferred into untreated or alum injected NZM2758 mice. RESULTS: By day 30
post-immunisation, Ro52 immunised mice generated immunoprecipitating anti-Ro52
antibodies and they had the maximum drop in saliva production. Both Ro52
immunised and control mice showed evidence of mild sialoadenitis. However, only
Ro52 immunised mice had antibody deposition in their SG. Passive transfer of
Ro52-immune sera induced SG dysfunction in recipient mice, only if the recipients
were primed with alum. In vitro, antibodies from Ro52-immune sera were
internalised by a SG cell line and this uptake was inhibited by cytochalasin D
treatment. CONCLUSIONS: Our data show for the first time that antibodies induced
by Ro52 are capable of inducing SG dysfunction, and that this phenomenon is
dependent on the activation of innate immunity. The mouse model described in this
study implies that autoantibody deposition in the SG might be an important step
in the induction of xerostomia and pathogenesis of SS.