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Self-Adjuvanting Lipopeptide Vaccines

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Despite the important role of adjuvants for vaccine development, relatively few adjuvants have been successfully incorporated into vaccines intended for human administration. This is in part due to the high toxicity associated with many experimental adjuvants. This lack of choice effectively hinders the ability to produce vaccines against many diseases, or to improve current vaccine formulations. The conjugation of immunostimulatory lipids to peptide antigens, to produce self-adjuvanting lipopeptide vaccines, has been tested in human clinical trials. These systems appear to have a number of advantages over more traditional adjuvants (e.g. alum salts) including the capacity for these vaccines to be administered via mucosal routes (e.g. orally or nasally) instead of by injection, elicitation of antigenspecific cytotoxic T-lymphocytes and mucosal immunity, as well as little-to-no observed toxicity. Several lipopeptide vaccine systems have been described in the literature, ranging from the conjugation of single fatty acid chains, to the conjugation of more complex lipids and glycolipids onto peptide antigens. The following review provides an overview of the most studied lipopeptide vaccine systems grouped into the following categories: 1) bacterial lipopeptides, including tri-palmitoyl-S-glyceryl cysteine (Pam3Cys) and di-palmitoyl- S-glyceryl cysteine (Pam2Cys); 2) the lipid-core peptide (LCP) and multiple antigen lipophilic adjuvant carrier (MALAC) systems; 3) single-chain palmitoylated peptides; and 4) glycolipids (e.g. monophosphoryl lipid A). The review also discusses the potential mechanisms of action for lipopeptide and glycolipopeptide vaccines, as well as structure activity relationships, and provides examples of studies utilising each system.
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Keywords: Lipid core peptide system; Pam2Cys; Pam3Cys; lipids; lipopeptide vaccines; monophosphoryl lipid A; palmitic acid; peptide vaccines

Document Type: Research Article

Affiliations: Rockefeller University, Box 223, 1230 York Ave, New York 10065, NY, USA.

Publication date: 01 February 2008

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  • Current Medicinal Chemistry covers all the latest and outstanding developments in medicinal chemistry and rational drug design. Each issue contains a series of timely in-depth reviews written by leaders in the field covering a range of the current topics in medicinal chemistry. Current Medicinal Chemistry is an essential journal for every medicinal chemist who wishes to be kept informed and up-to-date with the latest and most important developments.
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