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2017 ; 11
(8
): e0005861
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Host regulation of liver fibroproliferative pathology during experimental
schistosomiasis via interleukin-4 receptor alpha
#MMPMID28827803
Nono JK
; Ndlovu H
; Aziz NA
; Mpotje T
; Hlaka L
; Brombacher F
PLoS Negl Trop Dis
2017[Aug]; 11
(8
): e0005861
PMID28827803
show ga
Interleukin-4 receptor (IL-4R?) is critical for the initiation of type-2 immune
responses and implicated in the pathogenesis of experimental schistosomiasis.
IL-4R? mediated type-2 responses are critical for the control of pathology during
acute schistosomiasis. However, type-2 responses tightly associate with
fibrogranulomatous inflammation that drives host pathology during chronic
schistosomiasis. To address such controversy on the role of IL-4R?, we generated
a novel inducible IL-4R?-deficient mouse model that allows for temporal knockdown
of il-4r? gene after oral administration of Tamoxifen. Interrupting IL-4R?
mediated signaling during the acute phase impaired the development of protective
type-2 immune responses, leading to rapid weight loss and premature death,
confirming a protective role of IL-4R? during acute schistosomiasis. Conversely,
IL-4R? removal at the chronic phase of schistosomiasis ameliorated the
pathological fibro-granulomatous pathology and reversed liver scarification
without affecting the host fitness. This amelioration of the morbidity was
accompanied by a reduced Th2 response and increased frequencies of FoxP3+ Tregs
and CD1dhiCD5+ Bregs. Collectively, these data demonstrate that IL-4R? mediated
signaling has two opposing functions during experimental schistosomiasis
depending on the stage of advancement of the disease and indicate that
interrupting IL-4R? mediated signaling is a viable therapeutic strategy to
ameliorate liver fibroproliferative pathology in diseases like chronic
schistosomiasis.