SjHSP70, a recombinant Schistosoma japonicum heat shock protein 70, is immunostimulatory and induces protective immunity against cercarial challenge in mice

文献类型： 外文期刊

第一作者： Duan, Ming Ming

作者： Duan, Ming Ming;Xu, Rui Min;Yuan, Chun Xiu;Li, Yun Yan;Liu, Qun;Cheng, Guo Feng;Lin, Jiao-Jiao;Feng, Xin Gang;Li, Yun Yan;Liu, Qun;Lin, Jiao-Jiao

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关键词： Heat shock protein 70;Schistosoma japonicum;Immunostimulation;Adjuvant

期刊名称：PARASITOLOGY RESEARCH （ 影响因子：2.289； 五年影响因子：2.403 ）

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收录情况： SCI

摘要： High levels of protective immunity can be induced in different animals immunized with radiation-attenuated (RA) Schistosoma cercariae or schistosomula. However, the schistosome-derived molecules responsible for the strong protective effect elicited by RA schistosome larvae have not been identified or characterized. The 70-kDa heat shock proteins of schistosomes are considered major immunogens, and may play an important role in stimulating high levels of innate and adaptive immune responses in an RA schistosome vaccine model. Here, we demonstrate the immunobiological functions of Schistosoma japonicum heat shock protein 70 (SjHSP70) by investigating its expression profile in RA-schistosomula-derived cells, evaluating the protection induced by recombinant SjHSP70 (rSjHSP70) against cercarial challenge, and assaying the humoral and cellular immune responses to rSjHSP70 in BALB/c and C57BL/6 mice. The expression of SjHSP70 on the surfaces of cells from RA or normal schistosomula was determined with flow cytometry. Its expression was significantly higher on early RA schistosomula cells than on the cells from normal parasites. The protection afforded both BALB/c and C57BL/6 mice vaccinated with rSjHSP70 alone, rSj22.6 (a membrane-anchoring protein of S. japonicum) alone, or a combination of rSj22.6 and rSjHSP70 without adjuvant was evaluated. rSjHSP70 alone induced the highest protective effect against S. japonicum cercarial challenge, followed by the rSj22.6 plus rSjHSP70 combination and then rSj22.6 alone, in both mouse strains. Like ISA206 adjuvant, rSjHSP70 enhanced the protective efficacy induced by rSj22.6 in the C57BL/6 mouse strain. Antigen-specific IgG1 and IgG2a responses were detected with enzyme-linked immunosorbent assays in mice immunized with rSjHSP70 alone, rSj22.6 alone, or the rSj22.6 plus rSjHSP70 combination. Immunization with rSjHSP70 or the rSj22.6 plus rSjHSP70 combination induced mixed Th1/Th2-type antibody responses in BALB/c mice and a Th2-type antibody response in C57BL/6 mice. The profiles of cytokine production by splenic lymphocytes in both strains of mice immunized with the antigens described above were detected in vitro using a Cytometric Bead Array. The profiles of the proinflammatory cytokines interferon gamma, tumor necrosis factor alpha, interleukin 6 (IL-6), and IL-17A and the regulatory cytokine IL-10 induced by the rSj22.6 plus rSjHSP70 combination were similar to those induced by rSj22.6 emulsified with the ISA206 adjuvant control. Like the ISA206 adjuvant, rSjHSP70 protein enhanced the proinflammatory and Th2-type or regulatory cytokine production induced by the rSj22.6 antigen. These results indicate that SjHSP70 is exposed on the surfaces of cells from RA schistosomula, and that rSjHSP70 protein is a promising protective antigen with a potential adjuvant function. Thus, SjHSP70 protein might play a key role in the protective immunity elicited by the RA schistosome vaccine.

分类号： R53

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