Co-administration of interleukins 7 and 15 with DNA vaccine improves protective immunity against Toxoplasma gondii
文献类型: 外文期刊
第一作者: Chen, Jia
作者: Chen, Jia;Li, Zhong-Yuan;Liu, Wen-Ge;Zhu, Xing-Quan;Chen, Jia;Petersen, Eskild;Zhu, Xing-Quan
作者机构:
关键词: Toxoplasma gondii;Toxoplasmosis;TgCDPK1;pVAX-IL-7-IL-15;DNA vaccine;Protective immunity
期刊名称:EXPERIMENTAL PARASITOLOGY ( 影响因子:2.011; 五年影响因子:2.132 )
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收录情况: SCI
摘要: Toxoplasma gondii is an obligatory intracellular parasite, which can infect all warm-blooded animals including humans. Cytokines, including IL-15 and IL-7, play a critical role in the regulation of the homeostasis of naive and memory T cells. Co-administration the DNA vaccine with cytokines may improve its efficacy. IL-7 and IL-15 from splenic tissues of Kunming mice were cloned, and eukaryotic plasmid pVAX-IL-7-IL-15 was constructed. Kunming mice were administrated with DNA vaccine expressing T gondii calcium-dependent protein kinase 1 (TgCDPK1), pVAX-CDPK1, in the presence or absence of IL-7 and IL-15 plasmids (pVAX-IL-7-IL-15), immune responses were analyzed including lymphoproliferative assay, cytokine and serum antibody measurements, flow cytometric surface markers on lymphocytes, and thus protective immunity against acute and chronic T. gondii infection was estimated. Mice injected with pVAX-CDPK1 supplemented with pVAX-IL-7-IL-15 showed higher Toxoplasma-specific IgG2a titers, Th1 responses associated with the production of IFN-gamma, IL-2 as well as cell-mediated cytotoxic activity where stronger frequencies of IFN-gamma secreting CD8+ and CD4+ T cells (CD8+/CD4+ IFN-gamma+ T cells) compared to controls. Co-administration of pVAX-IL-7-IL-15 and pVAX-CDPK1 significantly (P < 0.05) increased survival time (18.07 +/- 5.43 days) compared with pVAX-CDPK1 (14.13 +/- 3.85 days) or pVAX-IL-7-IL-15 (11.73 +/- 1.83 days) alone, and pVAX-IL-7-IL-15 + pVAX-CDPK1 significantly reduced the number of brain cysts (73.5%) in contrast to pVAX-CDPK1 (46.0%) or pVAX-IL-7-IL-15 alone (45.0%). Our results indicate that supplementation of DNA vaccine with IL-7 and IL-15 would facilitate specific humoral and cellular immune responses elicited by DNA vaccine against acute and chronic T. gondii infection in mice. (C) 2015 Elsevier Inc. All rights reserved.
分类号: Q958.9
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