Abstract
Abstract The purpose of this study was to design a novel and versatile adjuvant intended for mucosal vaccination based on biodegradable poly(DL-lactic-co-glycolic acid) (PLGA) nanoparticles (NPs) modified with the cationic surfactant dimethyldioctadecylammonium (DDA) bromide and the immunopotentiator trehalose-6,6′-dibehenate (TDB) (CAF01) to tailor humoral and cellular immunity characterized by antibodies and Th1/Th17 responses. Such responses are important for the protection against diseases caused by intracellular bacteria such as Chlamydia trachomatis and Mycobacterium tuberculosis. The hybrid NPs were engineered using an oil-in-water single emulsion method and a quality-by-design approach was adopted to define the optimal operating space (OOS). Four critical process parameters (CPPs) were identified, including the acetone concentration in the water phase, the stabilizer [polyvinylalcohol (PVA)] concentration, the lipid-to-total solid ratio, and the total concentration. The CPPs were linked to critical quality attributes consisting of the particle size, polydispersity index (PDI), zeta-potential, thermotropic phase behavior, yield and stability. A central composite face-centered design was performed followed by multiple linear regression analysis. The size, PDI, enthalpy of the phase transition and yield were successfully modeled, whereas the models for the zeta-potential and the stability were poor. Cryo-transmission electron microscopy revealed that the main structural effect on the nanoparticle architecture is caused by the use of PVA, and two different morphologies were identified: i) A PLGA core coated with one or several concentric lipid bilayers, and ii) a PLGA nanoshell encapsulating lipid membrane structures. The optimal formulation, identified from the OOS, was evaluated in vivo. The hybrid NPs induced antibody and Th1/Th17 immune responses that were similar in quality and magnitude to the response induced by DDA/TDB liposomes, showing that the adjuvant properties of DDA/TDB are maintained in the PLGA hybrid matrix. This study demonstrates the complexity of formulation design for the engineering of a hybrid lipid-polymer nanoparticle adjuvant.
Original language | English |
---|---|
Article number | 7669 |
Pages (from-to) | 48-57 |
Number of pages | 10 |
Journal | Journal of Controlled Release |
Volume | 210 |
DOIs | |
Publication status | Published - 28 Jul 2015 |
Bibliographical note
Funding Information:The work was funded by Innovation Fund Denmark (grant number 069-2011-1 and Centre for Nano-Vaccine , grant number 09-067052 ). We acknowledge the Danish Agency for Science, Technology and Innovation for funding the Zetasizer Nano ZS and Innovation Fund Denmark and the Danish Ministry of Science, Technology and Innovation for funding the nano-DSC. We also thank Apotekerfonden af 1991 for funding the Bomem IR spectrometer. The funding sources had no involvement in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; nor in the decision to submit the paper for publication.
Publisher Copyright:
© 2015 Elsevier B.V.
Other keywords
- Adjuvant
- Dimethyldioctadecylammonium (DDA)
- Drug delivery
- Nanomedicine
- Nanoparticles
- PLGA
- Quality-by-design (QbD)
- Trehalose 6,6-dibehenate
- Vaccine