Abstract：
:The effect of liposome encapsulation on the antibody response to bovine serum albumin (BSA), human carcinoembryonic antigen (CEA) and sheep IgG (sIgG) has been determined in the mouse. Dipalmitoylphosphatidylcholine/dimyristolylphosphatidylglycerol liposomes (10:1 molar ratio; 1 mumol) containing BSA, CEA or sIgG induced significant levels of IgG antibodies after one injection, and enhanced the proportion of IgG2a/2b to IgG1 on subsequent boost injection. The IgG antibody titre induced by liposomal antigen was 100-400-fold greater than immunization with antigen alone. Immunization with antigen and the water-soluble adjuvant N-acetylmuramyl-L-alanyl-D-isoglutamine (MDP; 50 micrograms) resulted in antibody titres intermediate between free and liposomal antigen. MDP did not enhance the proportion of IgG2a/2b to IgG1. Incorporation of the lipid soluble MDP derivative MDP-glycerol dipalmitate (MDP-GDP; 10 micrograms) liposomes containing protein antigens resulted in higher titres and enhanced IgG2b isotype expression. Analysis of serum IgG antibody-isotype levels after immunization and boost with BSA/MDP showed that the half-life of IgG2a/2b and IgG3 was significantly less than that of IgG1. Liposomal encapsulation resulted in longer IgG2a/2b and IgG3 half-lives, especially when MDP-GDP was present in the liposome. These results demonstrate that, whereas MDP preferentially stimulates IgG1 antibodies, liposomes elicit high levels of IgG2a/2b isotypes with significantly longer serum half-lives.
journal_name
Vaccinejournal_title
Vaccineauthors
Phillips NC,Emili Adoi
10.1016/0264-410x(92)90004-4subject
Has Abstractpub_date
1992-01-01 00:00:00pages
151-8issue
3eissn
0264-410Xissn
1873-2518pii
0264-410X(92)90004-4journal_volume
10pub_type
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