Induction of mucosal immune responses and protection of cattle against direct-contact challenge by intranasal delivery with foot-and-mouth disease virus antigen mediated by nanoparticles

文献类型： 外文期刊

第一作者： Pan, Li

作者： Pan, Li;Zhang, Zhongwang;Lv, Jianliang;Zhou, Peng;Hu, Wenfa;Fang, Yuzhen;Chen, Haotai;Liu, Xinsheng;Shao, Junjun;Zhao, Furong;Ding, Yaozhong;Lin, Tong;Chang, Huiyun;Zhang, Jie;Zhang, Yongguang;Wang, Yonglu;Zhang, Zhongwang;Lv, Jianliang;Zhou, Peng;Hu, Wenfa;Fang, Yuzhen;Chen, Haotai;Liu, Xinsheng;Shao, Junjun;Zhao, Furong;Ding, Yaozhong;Lin, Tong;Chang, Huiyun;Zhang, Jie;Zhang, Yongguang;Wang, Yonglu

作者机构：

关键词： FMDV;nanoparticles;chitosan;trehalose;poly(lactic-co-glycolic acid);PLGA

期刊名称：INTERNATIONAL JOURNAL OF NANOMEDICINE （ 影响因子：6.4； 五年影响因子：6.761 ）

ISSN： 1178-2013

年卷期： 2014 年 9 卷

页码：

收录情况： SCI

摘要： The aim of this study was to enhance specific mucosal, systemic, and cell-mediated immunity and to induce earlier onset of protection against direct-contact challenge in cattle by intranasal delivery of a nanoparticle-based nasal vaccine against type A foot-and-mouth disease ( FMD). In this study, two kinds of nanoparticle-based nasal vaccines against type A FMD were designed: (1) chitosan-coated poly(lactic-co-glycolic acid) (PLGA) loaded with plasmid DNA (Chi-PLGA-DNA) and (2) chitosan-trehalose and inactivated foot-and-mouth disease virus (FMDV) (Chi-Tre-Inactivated). Cattle were immunized by an intranasal route with nanoparticles and then challenged for 48 hours by direct contact with two infected donor cattle per pen. Donors were inoculated intradermally in the tongue 48 hours before challenge, with 0.2 mL cattle-passaged FMDV. Serological and mucosal antibody responses were evaluated, and virus excretion and the number of contact infections were quantified. FMDV-specific secretory immunoglobulin (I-g) A (sIgA) antibodies in nasal washes were initially detected at 4 days postvaccination (dpv) with two kinds of nanoparticles. The highest levels of sIgA expression were observed in nasal washes, at 10 dpv, from animals with Chi-PLGA-DNA nanoparticles, followed by animals immunized once by intranasal route with a double dose of Chi-Tre-Inactivated nanoparticles and animals immunized by intranasal route three times with Chi-Tre-Inactivated nanoparticles (P<0.05).FMDV-specificIgA antibodies in serum showed a similar pattern. All animals immunized byintranasal route developed low levels of detectable IgG in serum at 10 dpv. Following stimulation with FMDV, the highest levels of proliferation were observed in splenocytes harvested from Chi-PLGA-DNA-immunized animals, followed by proliferation of cells harvested from Chi-TreInactivatednanoparticle- immunized animals (P<0.05). Higher protection rates were associated with the highest sIgA antibody responses induced in the Chi-PLGA-DNA nanoparticle-immunized group. Only one animal was clinically affected with mild signs after 7 days of contact challenge, after a delay of 2-3 days compared with the clinically affected negative-control group. Of the five animals directly challenged that were vaccinated by intranasal route with a double dose of ChiTre-Inactivated, four were clinically infected; however, the degree of severity of disease in this group was lower than in control cattle. The number of viral RNA copies in nasal swabs from the vaccinated, severely infected group was significantly higher than in swabs from the vaccinated, clinically protected group. These data suggested that intranasal delivery of Chi-PLGA-DNA nanoparticles resulted in higher levels of mucosal, systemic, and cell-mediated immunity than did of Chi-Tre-Inactivated nanoparticles. In conclusion, although intranasal delivery with FMDV antigen mediated by nanoparticles did not provide complete clinical protection, it reduced disease severity and virus excretion and delayed clinical symptoms. Chi-PLGA-DNA nanoparticle vaccines have potential as a nasal delivery system for vaccines.

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