Summary
The muramyldipeptide derivative B30-MDP has immunoadjuvant activity and vesicleforming ability in aqueous solutions. To assist in the clinical application of B30-MDP to liposomal vaccine, we investigated the physicochemical properties including membrane fluidity, surface charge and particle size of B30-MDP vesicles containing cholesterol, dipalmitoylphosphatidyl-choline (DPPC) or dipalmitoylphosphatidylglycerol (DPPG).
The membrane fluidity of B30-MDP/cholesterol vesicles was slightly influenced by cholesterol concentration and temperature. The membrane fluidity of B30-MDP/phospholipid vesicle was dependent on temperature. ESR spectra clearly showed the good miscibility of cholesterol with B30-MDP and the occurrence of phase separation between B30-MDP and phospholipid.
The surface charge and particle size of B30-MDP/cholesterol vesicles were hardly influenced by cholesterol concentration in the membrane because the membrane surface was covered with the hydrophilic region of B30-MDP. The effect of this hydrophilic region of B30-MDP on the surface charge and particle size of B30-MDP/phospholipid vesicle was greater than that of phospholipid.
This study showed that the membrane structure of B30-MDP/cholesterol vesicle differed from that of B30-MDP/phospholipid vesicle. Further, the hydrophilic region of B30-MDP is considered to play an important role in the physicochemical properties and formation of the vesicle.
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Ando, S., Tsuge, H. & Mayumi, T. Effect of cholesterol or phospholipids incorporation on vesicle formation of muramyldipeptide derivative B30-MDP. Colloid Polym Sci 274, 178–185 (1996). https://doi.org/10.1007/BF00663451
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DOI: https://doi.org/10.1007/BF00663451