Abstract
Leishmania major antigen-liposomes prepared as dehydration-rehydration vesicles (DRV) and composed of equimolar amounts of L-alpha-distearoyl phosphatidylcholine and cholesterol confer high-level host-protective immunity against virulent homologous challenge to susceptible BALB/c mice. Physical and antigenic characterization of these protective liposomes is described. Both empty and L. major antigen-DRV were multilamellate and heterogeneous in size, ranging from 0.10 to 2.00 microns. Although the liposomes were made by using a crude mixture of promastigote antigens, lipophosphoglycan covered the liposome surface; this was demonstrated by immunogold electron microscopy. Application of sodium dodecyl sulfate-polyacrylamide gel electrophoresis and Western blot (immunoblot) analysis revealed preferential entrapment of the 63-kilodalton promastigote protease (gp63) into the DRV. We suggest that our L. major antigen-DRV merit further study because of their preferential entrapment of these two host protective antigens together with their long in vivo half-life. In addition, this report illustrates that intravenous or subcutaneous immunization of BALB/c mice with the same limited subset of protective antigens, predominantly lipophosphoglycan and gp63, within DRV liposomes leads to either protection and low splenic interleukin-3 production or to nonprotection and high splenic interleukin-3 production, respectively. This was consistent with our hypothesis that differential antigen presentation after administration of the same immunogen by the intravenous or the subcutaneous route results in differential T-cell activation.
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