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2014 ; 111
(48
): E5169-77
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Basophil-mediated protection against gastrointestinal helminths requires
IgE-induced cytokine secretion
#MMPMID25404305
Schwartz C
; Turqueti-Neves A
; Hartmann S
; Yu P
; Nimmerjahn F
; Voehringer D
Proc Natl Acad Sci U S A
2014[Dec]; 111
(48
): E5169-77
PMID25404305
show ga
Basophils orchestrate protection against reinfections with gastrointestinal
helminths and ticks, but the underlying mechanisms remain elusive. We
investigated the role of Fc receptors on basophils, the antibody isotypes IgG1
and IgE, and basophil-derived IL-4/IL-13 during challenge infections with
Heligmosomoides polygyrus and Nippostrongylus brasiliensis. Using mixed bone
marrow chimeras, we found that activating Fc receptors on basophils were required
for protective immunity but not for regulation of basophil homeostasis.
Furthermore, rapid worm expulsion was impaired in IgE-deficient but not in
IgG1-deficient mice. Basophils promoted the recruitment of other effector cells
into the small intestine and induced expression of the antihelminthic proteins
resistin-like molecule ? and mucin 5ac. Selective deletion of IL-4/IL-13 in
basophils resulted in impaired worm expulsion. Collectively, our results indicate
that IgE-mediated activation of basophils and the release of basophil-derived
IL-4/IL-13 are critical steps in protective immunity against helminths.
Therefore, development of effective vaccines against helminths should consider
boosting the IL-4/IgE/basophil axis of the immune system.