Adjuvancy enhancement of muramyl dipeptide by modulating its release from a physicochemically modified matrix of ovalbumin microspheres: I. In vitro characterization

The weak immunogenicity of subunit vaccines has necessitated research into the development of novel adjuvants and methods to enhance the adjuvancy associated with vaccine delivery systems. The purpose of the present study was to modulate the release of muramyl dipeptide (MDP) from a physicochemicall...

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Bibliographic Details
Published in:Journal of controlled release 2000-10, Vol.69 (1), p.53-67
Main Authors: Puri, Navneet, Kou, Jim H., Sinko, Patrick J.
Format: Article
Language:English
Subjects:
Acetylmuramyl-Alanyl-Isoglutamine - chemistry
Adjuvancy
Adjuvants, Pharmaceutic - chemistry
Algorithms
Biological and medical sciences
Calorimetry, Differential Scanning
Chemical Phenomena
Chemistry, Physical
Controlled release
Cross-Linking Reagents
Electrophoresis, Polyacrylamide Gel
Emulsions
General pharmacology
Immunomodulators
Medical sciences
Microspheres
Muramyl dipeptide
Ovalbumin
Ovalbumin - chemistry
Particle Size
Pharmaceutical technology. Pharmaceutical industry
Pharmacology. Drug treatments
Solubility
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Summary:The weak immunogenicity of subunit vaccines has necessitated research into the development of novel adjuvants and methods to enhance the adjuvancy associated with vaccine delivery systems. The purpose of the present study was to modulate the release of muramyl dipeptide (MDP) from a physicochemically modified matrix of ovalbumin microspheres (OVA-MSs). A two-component MS vaccine delivery system was fabricated, which utilized OVA as the antigen and delivery matrix, and MDP as the adjuvant. The MSs were prepared from OVA using a water/oil emulsion method, followed by suspension cross-linking using glutaraldehyde. The MS matrix was modified with respect to the degree of cross-linking by varying the concentration of glutaraldehyde and matrix density, a function of disulfide-bond formation. The modifications in the MS matrix were characterized using SDS–PAGE, scanning electron microscopy, differential scanning calorimetry, and thin layer wicking (TLW). The in vitro release of MDP and OVA from the various preparations of OVA-MSs exhibited triphasic and biphasic profiles, respectively. The degree of cross-linking and the matrix density were found to be significant physicochemical parameters that affected the release profiles of MDP and OVA through two mechanisms: controlled surface erosion and bulk degradation of the MSs.
ISSN:0168-3659
1873-4995
DOI:10.1016/S0168-3659(00)00289-3