Universiteit Leiden

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PLGA-based particulate vaccine delivery systems for immunotherapy of cancer

Promotores: W. Jiskoot, F. Ossendorp

A.L. Monteiro Garrido Castro e Silva
22 december 2015
Thesis in Leiden Repository

Synthetic long peptides (SLPs) derived from cancer antigens hold great promise as well-defined antigens for immunotherapy of cancer. However, the formulation of SLPs for in vivo administration still needs to be improved. So far, SLPs have been formulated in Montanide-based water-in-oil emulsions in (pre-)clinical trials. However, the use of Montanide as an adjuvant has some important limitations, such as: non-biodegradability; significant local side effects; poor control of release rate; lack of specific dentritic cell (DC)-activating capacity; and the presence of organic solvents (needed to dissolve the peptides prior to mixing with the adjuvant) in the final formulation. Therefore, alternative formulations containing an effective delivery system for peptide-based cancer vaccines are highly needed. Among the numerous vaccine delivery systems, poly(lactic-co-glycolic acid) (PLGA) biodegradable particulate delivery systems are particularly interesting because they are biocompatible; can protect soluble antigens from degradation and rapid clearance once administered; allow for co-encapsulation of (multiple) antigens and adjuvants; and mimic the size and structure of a pathogen, being more efficiently taken up by DCs than soluble antigen. This thesis describes fundamental studies on the design and applicability in a preclinical setting of PLGA-based particulate formulations for the delivery of SLP-based cancer vaccines.