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2017 ; 7
(1
): 11153
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T-cell tolerance and exhaustion in the clearance of Echinococcus multilocularis:
role of inoculum size in a quantitative hepatic experimental model
#MMPMID28894272
Zhang C
; Shao Y
; Yang S
; Bi X
; Li L
; Wang H
; Yang N
; Li Z
; Sun C
; Li L
; Lü G
; Aji T
; Vuitton DA
; Lin R
; Wen H
Sci Rep
2017[Sep]; 7
(1
): 11153
PMID28894272
show ga
The local immune mechanisms responsible for either self-healing or sustained
chronic infection are not clear, in the development of E. multilocularis larvae.
Here, we developed a suitable experimental model that mimics naturally infected
livers, according to the parasite load. We demonstrated that local cellular
immunity and fibrogenesis are actually protective and fully able to limit
metacestode growth in the liver of low or medium dose-infected mice (LDG or MDG),
or even to clear it, while impairment of cellular immunity is followed by a more
rapid and severe course of the disease in high dose-infected mice (HDG). And
recruitment and/ or proliferation of memory T cells (including CD4 Tem, CD8 Tcm
and CD8 Tem) and imbalance of T1/T2/T17/Treg-type T cells in liver were not only
associated with clearance of the parasite infection in LDG, but also with
increased hepatic injury in HDG; in particular the dual role of CD8 T cells
depending on the parasite load and the various stages of metacestode growth.
Besides, we first demonstrate the association between LAG3- or 2B4-expressing T
cells exhaustion and HD inocula in late stages. Our quantitative experimental
model appears fully appropriate to study immunomodulation as a therapeutic
strategy for patients with Alveolar Echinococcosis.