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2016 ; 73
(ä): 30-41
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Modulation of natural IgM autoantibodies to oxidative stress-related neo-epitopes
on apoptotic cells in newborns of mothers with anti-Ro autoimmunity
#MMPMID27289167
Grönwall C
; Clancy RM
; Getu L
; Lloyd KA
; Siegel DL
; Reed JH
; Buyon JP
; Silverman GJ
J Autoimmun
2016[Sep]; 73
(ä): 30-41
PMID27289167
show ga
At birth, the human immune system already contains substantial levels of
polymeric IgM, that include autoantibodies to neo-epitopes on apoptotic cells
(ACs) that are proposed to play homeostatic and anti-inflammatory roles. Yet the
biologic origins and developmental regulation of these naturally arising
antibodies remain poorly understood. Herein, we report that levels of
IgM-antibodies to malondialdehyde (MDA) protein adducts, a common type of in vivo
generated oxidative stress-related neoepitope, directly correlate with the
relative binding of neonatal-IgM to ACs. Levels of IgM to phosphorylcholine (PC),
a natural antibody prevalent in adults, were relatively scant in cord blood,
while there was significantly greater relative representation of IgM anti-MDA
antibodies in newborns compared to adults. To investigate the potential
interrelationships between neonatal IgM with pathogenic IgG-autoantibodies, we
studied 103 newborns born to autoimmune mothers with IgG anti-Ro (i.e., 70 with
neonatal lupus and 33 without neonatal lupus). In these subjects the mean levels
of IgM anti-Ro60 were significantly higher than in the newborns from
non-autoimmune mothers. In contrast, levels of IgM anti-MDA in IgG anti-Ro
exposed neonates were significantly lower than in neonates from non-autoimmune
mothers. The presence or absence of neonatal lupus did not appear to influence
the total levels of IgM in the anti-Ro exposed newborns. Taken together, our
studies provide evidence that the immune development of the natural
IgM-repertoire may be affected, and become imprinted by, the transfer of maternal
IgG into the fetus.