Abstract
The immune responses of mice against glycosphingolipid (GSL) antigens and the effect of the phospholipid composition of liposomes on the immunogenicity in mice of liposome-associated GSL antigens were examined. The immunization with GSL antigen alone was unable to induce any detectable anti-GSL antibody responses. On the other hand, the immune responses against GSL antigens were detected after immunization with liposomes composed of dipalmitoylphosphatidylcholine (DPPC) (0.5 micromol), cholesterol (Chol) (0.5 micromol), Salmonella minnesota R595 lipopolysaccharides (LPS) (10 microg) and GSL (0.05 micromol) (DPPC-liposome). However, the administration with liposome composed of dimyristoylphosphatidylcholine (DMPC) (0.5 micromol), Chol (0.5 micromol), S. minnesota R595 LPS (10 microg) and GSL (0.05 micromol) and with liposomes composed of distearylphosphatidylcholine (DSPC) (0.5 micromol), Chol (0.5 micromol), and S. minnesota R595 LPS (10 microg) and GSL (0.05 micromol) was ineffective for the induction of the immune responses against GSL antigens. These results suggest that DPPC-liposome would serve effectively as a delivery vehicle for inducing immune responses against GSL antigen.
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