HKUST Library Institutional Repository Banner

HKUST Institutional Repository >
The Nano Science and Technology Program >
NSNT Master Theses  >

Please use this identifier to cite or link to this item:
Title: Study on nanoparticles as vaccine adjuvants
Authors: Leung, Thomas Chun Yiu
Issue Date: 2010
Abstract: Adjuvants are materials that can enhance the immune response of a specific antigen and prolong the immune effects induced by the antigen. The addition of an adjuvant to vaccines can enhance, sustain and direct the immunogenicity of antigens, and so reduce the amount of antigen and/or number of immunizations required. In this study, a modified swine Foot and Mouse Disease (FMD) antigen was used as a test antigen in an animal model. Two types of nanoparticles, silver nanoparticles and lipid nanoparticles, were designed and synthesized for the adjuvant testing. A novel, green method was developed in synthesizing silver nanoparticles using biopolymers, such as carboxymethylated-curdlan or fucoidan; whereas the lipid nanoparticles were derived from microbial cell wall components of Salmonella typhimurium, named monophosphoryl lipid A (MPL-ST). In animal trials, we investigated different formulations of nanoparticles, including silver nanoparticles alone, MPL-ST alone or combined with Al(OH)3 as adjuvants for the FMD vaccine. Our ELISA results indicated that silver nanoparticles only show a slightly enhanced effect on the vaccine functions. In contrast, MPL-ST was found to be very effective; the serum FMD-specific IgG, IgG1, IgG 2a antibody titers in the immunized mice were significantly enhanced by MPL-ST. Al(OH)3 combined with MPL-ST induced even higher immune responses. Al(OH)3 elicited a strong biased Th2 immune response, as evaluated by an increase in the IgG1:IgG2a ratio, while MPL-ST showed a more balanced response. Moreover, amongst all the different formulations, the use of the MPL-ST and Al(OH)3 combination led to the induction of the highest IgG levels. This result implies that MPL-ST and Al(OH)3 act synergistically as a potent vaccine formulation.
Description: Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2010
xvi, 85 p. : ill. (some col.) ; 30 cm
HKUST Call Number: Thesis NSNT 2010 Leung
Appears in Collections:NSNT Master Theses

Files in This Item:

File Description SizeFormat

All items in this Repository are protected by copyright, with all rights reserved.