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Trichinella Spiralisthioredoxin Peroxidase 2 Regulates Protective Th2 Immune Response In Mice By Directly Inducing Alternatively Activated Macrophages

文献类型： 外文期刊

作者： Jin, QW; Zhang, NZ; Li, WH; Qin, HT; Liu, YJ; Ohiolei, JA; Niu, DY; Yan, HB; Li, L; Jia, WZ; Song, MX; Fu, BQ

作者机构：

关键词： Trichinella Spiralis; Thioredoxin Peroxidase-2; Th2 Immune Responses; Macrophage; Alternative Activation

期刊名称： FRONTIERS IN IMMUNOLOGY

ISSN： 1664-3224

年卷期： 2020 年 11 卷

页码：

收录情况： JCR（2021版）

摘要： Trichinellainfection can induce macrophages into the alternatively activated phenotype, which is primarily associated with the development of a polarized Th2 immune response. In the present study, we examined the immunomodulatory effect ofT. spiralisthioredoxin peroxidase-2 (TsTPX2), a protein derived fromT. spiralisES products, in the regulation of Th2 response through direct activation of macrophages. The location of TsTPX2 was detected by immunohistochemistry and immunofluorescence analyses. The immune responsein vivoinduced by rTsTPX2 was characterized by analyzing the Th2 cytokines and Th1 cytokines in the peripheral blood. The rTsTPX2-activated macrophages (M-rTsTPX2) were tested for polarization, their ability to evoke naive CD4(+)T cells, and resistance to the larval infection after adoptive transfer in BALB/c mice. The immunolocalization analysis showed TsTPX2 in cuticles and stichosome ofT. spiralisML. The immunostaining was detected in cuticles and stichosome ofT. spiralisAd3 and ML, as well as in tissue-dwellings around ML after the intestines and muscle tissues of infected mice were incubated with anti-rTsTPX2 antibody. Immunization of BALB/c mice with rTsTPX2 could induce a Th1-suppressing mixed immune response given the increased levels of Th2 cytokines (IL-4 and IL-10) production along with the decreased levels of Th1 cytokines (IFN-gamma, IL-12, and TNF-alpha).In vitrostudies showed that rTsTPX2 could directly drive RAW264.7 and peritoneal macrophages to the M2 phenotype. Moreover, M(rTsTPX2)could promote CD4(+)T cells polarized into Th2 typein vitro. Adoptive transfer of M(rTsTPX2)into mice suppressed Th1 responses by enhancing Th2 responses and exhibited a 44.7% reduction in adult worm burden following challenge withT. spiralisinfective larval, suggesting that the TsTPX2 is a potential vaccine candidate against trichinosis. Our study showed that TsTPX2 would be at least one of the molecules to switch macrophages into the M2 phenotype duringT. spiralisinfection, which provides a new therapeutic approach to various inflammatory disorders like allergies or autoimmune diseases.

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