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2016 ; 7
(ä): 493
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Pneumococcal Polysaccharide Vaccination Elicits IgG Anti-A/B Blood Group
Antibodies in Healthy Individuals and Patients with Type I Diabetes Mellitus
#MMPMID27895641
Wolfram W
; Sauerwein KM
; Binder CJ
; Eibl-Musil N
; Wolf HM
; Fischer MB
Front Immunol
2016[]; 7
(ä): 493
PMID27895641
show ga
HYPOTHESIS: Blood group antibodies are natural antibodies that develop early in
life in response to cross-reactive environmental antigens in the absence of
antigen encounter. Even later in life structural similarities in saccharide
composition between environmental antigens such as bacterial polysaccharides and
blood group A/B antigens could lead to changes in serum levels, IgM/IgG isotype,
and affinity maturation of blood group anti-A/B antibodies. We addressed the
question whether immunization with pneumococcal polysaccharide (PnP) vaccine
Pneumo 23 Vaccine "Pasteur Merieux" (Pn23) could have such an effect in patients
with type I diabetes mellitus (DM I), an autoimmune disease where an aberrant
immune response to microbial antigens likely plays a role. METHODS: Anti-PnP IgM
and IgG responses were determined by ELISA, and the DiaMed-ID Micro Typing System
was used to screen anti-A/B antibody titer before and after Pn23 immunization in
28 healthy individuals and 16 patients with DM I. In addition, surface plasmon
resonance (SPR) technology using the Biacore(®) device and a synthetic blood
group A/B trisaccharide as the antigen was applied to investigate IgM and IgG
anti-A/B antibodies and to measure antibody binding dynamics. RESULTS: All
healthy individuals and DM I patients responded with anti-PnP IgM and IgG
antibody production 4-6?weeks after Pn23 immunization, while no increase in blood
group anti-A/B antibody titer was observed when measured by the DiaMed-ID Micro
Typing System. Interestingly, isotype-specific testing by SPR technology revealed
an increase in blood group anti-A/B IgG, but not IgM, following Pn23 immunization
in both patients and controls. No change in binding characteristics of blood
group anti-A/B antibodies could be detected following Pn23 vaccination,
supporting the assumption of an increase in IgG antibody titer with no or very
little affinity maturation. CONCLUSION: The study provides evidence for epitope
sharing between pneumococcal polysaccharides and blood group ABO antigens, which
leads to a booster of blood group anti-A/B antibodies of the IgG isotype after
Pn23 immunization in healthy individuals. Manifest autoimmunity such as present
in DM I patients has no additional effect on the cross-reactive antibody response
against pneumococcal polysaccharides and blood group antigens.