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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 J+Immunol
2015 ; 194
(12
): 5838-50
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Neonatal exposure to pneumococcal phosphorylcholine modulates the development of
house dust mite allergy during adult life
#MMPMID25957171
Patel PS
; Kearney JF
J Immunol
2015[Jun]; 194
(12
): 5838-50
PMID25957171
show ga
Currently, ?20% of the global population suffers from an allergic disorder.
Allergies and asthma occur at higher rates in developed and industrialized
countries. It is clear that many human atopic diseases are initiated neonatally
and herald more severe IgE-mediated disorders, including allergic asthma, which
is driven by the priming of Th2 effector T cells. The hygiene hypothesis attempts
to link the increased excessively sanitary conditions early in life to a default
Th2 response and increasing allergic phenomena. Despite the substantial
involvement of IgE Abs in such conditions, little attention has been paid to the
effects of early microbial exposure on the B cell repertoire prior to the
initiation of these diseases. In this study, we use Ab-binding assays to
demonstrate that Streptococcus pneumoniae and house dust mite (HDM) bear similar
phosphorylcholine (PC) epitopes. Neonatal C57BL/6 mice immunized with a
PC-bearing pneumococcal vaccine expressed increased frequencies of PC-specific B
cells in the lungs following sensitizing exposure to HDM as adults. Anti-PC IgM
Abs in the lung decreased the interaction of HDM with pulmonary APCs and were
affiliated with lowered allergy-associated cell infiltration into the lung, IgE
production, development of airway hyperresponsiveness, and Th2 T cell priming.
Thus, exposure of neonatal mice to PC-bearing pneumococci significantly reduced
the development of HDM-induced allergic disease during adult life. Our findings
demonstrate that B cells generated against conserved epitopes expressed by
bacteria, encountered early in life, are also protective against the development
of allergic disease during adult life.