Biodegradable Imiquimod-Loaded Mesoporous Organosilica as a Nanocarrier and Adjuvant for Enhanced and Prolonged Immunity against Foot-and-Mouth Disease Virus in Mice

文献类型： 外文期刊

第一作者： Yin, Wenzhu

作者： Yin, Wenzhu;Xuan, Dechun;Wang, Haiyan;Zhou, Mingxu;Deng, Bihua;Ma, Fang;Lu, Yu;Zhang, Jinqiu;Yin, Wenzhu;Lu, Yu;Zhang, Jinqiu;Xuan, Dechun;Lu, Yu;Zhang, Jinqiu

作者机构：

关键词： mesoporous organosilica nanoparticles; imiquimod; FMDV; adjuvant; immunity

期刊名称：ACS APPLIED BIO MATERIALS （ 影响因子：4.7； 五年影响因子：4.6 ）

ISSN： 2576-6422

年卷期： 2022 年 5 卷 6 期

页码：

收录情况： SCI

摘要： Foot-and-mouth disease (FMD), a serious, fast-spreading, and virulent disease, has led to huge economic losses to people all over the world. Vaccines are the most effective way to control FMD. However, the weak immunogenicity of inactivated FMD virus (FMDV) requires the addition of adjuvants to enhance the immune effectiveness of the vaccines. Herein, we formulated and fabricated biodegradable dendritic mesoporous tetrasulfide-doped organosilica nanoparticles SOMSN with imiquimod complex (SOMSN-IMQ) and used it as a platform for FMD vaccine delivery and as an adjuvant. SOMSN-IMQ demonstrated excellent stability for 6 months when stored in PBS, while it could be completely degraded within 42 days in SBF at room temperature. Biosafety experiments such as cell toxicity, hemolysis, and histology indicated that the asprepared SOMSN-IMQ showed nontoxicity and good biocompatibility. Furthermore, SOMSN-IMQ exhibited a maximum adsorption capacity of 1000 mu g/mg for inactivated FMDV antigens. Our results showed that SOMSN-IMQ can be effectively engulfed by RAW264.7 cells in a dose-dependent manner. After immunization, SOMSN-IMQ@FMDV can elicit persistent higher antibody levels, higher IgG2a/IgG1 ratio, and cytokine expression, which indicated that SOMSN-IMQ@FMDV triggered superior humoral and cellular immune responses. Moreover, SOMSN-IMQ could provoke maturation and activation of dendritic cells in lymph nodes (LDCs) as well as the proliferation of lymphocytes in vivo. Thus, SOMSN-IMQ could promote effective and potent immunity and provide a promising adjuvant platform for FMDV vaccination with acceptable safety.

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