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Adjuvant Activity of Poly-ε-caprolactone/Chitosan Nanoparticles Characterized by Mast Cell Activation and IFN-γ and IL-17 Production
Molecular Pharmaceutics ( IF 4.5 ) Pub Date : 2017-12-07 00:00:00 , DOI: 10.1021/acs.molpharmaceut.7b00730
Sandra Jesus 1, 2 , Edna Soares 1, 2 , Gerrit Borchard 3 , Olga Borges 1, 2
Affiliation  

Polymeric nanoparticles (NPs) are extremely attractive vaccine adjuvants, able to promote antigen delivery and in some instances, exert intrinsic immunostimulatory properties that enhance antigen specific humoral and cellular immune responses. The poly-ε-caprolactone (PCL)/chitosan NPs were designed with the aim of being able to combine the properties of the 2 polymers in the preparation of an adjuvant for the hepatitis B surface antigen (HBsAg). This article reports important results of an in vitro mechanistic study and immunization studies with HBsAg associated with different concentrations of the nanoparticles. The results revealed that PCL/chitosan NPs promoted mast cell (MC) activation (β-hexosaminidase release) and that its adjuvant effect is not mediated by the TNF-α secretion. Moreover, we demonstrated that HBsAg loaded PCL/chitosan NPs, administered through the subcutaneous (SC) route, were able to induce higher specific antibody titers without increasing IgE when compared to a commercial vaccine, and that the IgG titers are nanoparticle-dose dependent. The results also revealed the NPs’ capability to promote a cellular immune response against HBsAg, characterized by the production of IFN-γ and IL-17. These results demonstrated that PCL/chitosan NPs are a good hepatitis B antigen adjuvant, with direct influence on the intensity and type of the immune response generated.

中文翻译:

肥大细胞活化,IFN-γ和IL-17产生的聚ε-己内酯/壳聚糖纳米颗粒的佐剂活性

聚合纳米颗粒(NPs)是极具吸引力的疫苗佐剂,能够促进抗原递送,并在某些情况下发挥内在的免疫刺激特性,从而增强抗原特异性的体液和细胞免疫反应。设计聚ε-己内酯(PCL)/壳聚糖NP的目的是能够结合这两种聚合物的特性来制备乙型肝炎表面抗原(HBsAg)的佐剂。本文报告了体外的重要结果HBsAg与不同浓度的纳米颗粒相关的机理研究和免疫研究。结果表明,PCL /壳聚糖NPs促进肥大细胞(MC)活化(β-己糖胺酶释放),并且其辅助作用不受TNF-α分泌的介导。此外,我们证明与市售疫苗相比,通过皮下(SC)途径施用的HBsAg负载PCL /壳聚糖NPs能够诱导更高的特异性抗体滴度而不增加IgE,并且IgG滴度是纳米颗粒剂量依赖性的。结果还揭示了NPs促进针对HBsAg的细胞免疫反应的能力,其特征是产生IFN-γ和IL-17。这些结果表明,PCL /壳聚糖NPs是良好的乙型肝炎抗原佐剂,
更新日期:2017-12-07
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