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Preparation of influenza virosome vaccine with muramyldipeptide derivative B30-MDP
Abstract:
An influenza virosome vaccine, consisting of influenza hemagglutinin-neuraminidase antigens (HANA), the muramyldipeptide derivative 6-O-(2-tetra-decylhexadecanoyl)-N-acetyl-muramyl-L-alanyl-D-isoglu tamine (B30-MDP) and cholesterol, was prepared by the detergent removal method using a flow-through dialyzer, Liposomat. The shape of the influenza virosome vaccine mimicked that of the influenza virus, namely, B30-MDP/cholesterol vesicle covered with HANA spikes. THe particle size and size distribution of prepared virosomes were evaluated by quasi-elastic laser light scattering and gel permeation chromatography. The state of incorporation of HANA spikes at the membrane surface of virosome was confirmed by electron microscopy. The results indicated that virosome formation was influenced by initial B30-MDP concentration in the mixed micellar solution prior to dialysis. It is apparent that the initial concentration of B30-MDP, relative to the mixed-micelle-to-virosome transition, is an important factor for virosome preparation. Accordingly, the transition was evaluated and clarified by the changes in membrane fluidity and particle size during the dialysis process. The results indicated that it is important to adjust the initial B30-MDP concentration in the mixed micellar solution before dialysis so that the concentration for the mixed-micelle-to-vesicle transition coincides with that for mixed-micelle-to-rosette-transition appropriate for virosome formation.
Insights
This study details the creation of an influenza virosome vaccine using a novel detergent removal method. Optimizing the initial concentration of B30-MDP is crucial for successful virosome formation and vaccine efficacy.
Area of Science:
- Biotechnology
- Vaccine Development
- Materials Science
Background:
- Influenza virosomes are promising vaccine candidates that mimic the structure of influenza viruses.
- The preparation of these virosomes involves complex self-assembly processes requiring precise control.
Purpose of the Study:
- To investigate the critical factors influencing the formation of influenza virosomes.
- To optimize the preparation method for influenza virosome vaccines.
Main Methods:
- Preparation of influenza virosomes using hemagglutinin-neuraminidase antigens (HANA), B30-MDP, and cholesterol via detergent removal with a Liposomat.
- Evaluation of particle size, size distribution, and HANA spike incorporation using quasi-elastic laser light scattering, gel permeation chromatography, and electron microscopy.
- Analysis of the mixed-micelle-to-vesicle and mixed-micelle-to-rosette transitions by monitoring membrane fluidity and particle size during dialysis.
Main Results:
- Virosome formation is significantly influenced by the initial concentration of B30-MDP in the mixed micellar solution.
- The initial B30-MDP concentration dictates the transition points from mixed micelles to vesicles and rosettes.
- Successful virosome formation requires aligning these transition concentrations for optimal vaccine structure.
Conclusions:
- Adjusting the initial B30-MDP concentration is a key parameter for reproducible and effective influenza virosome vaccine preparation.
- Understanding and controlling the self-assembly transitions are essential for producing structurally sound virosomes.
- This optimized method contributes to the advancement of influenza vaccine technology.