title: Antigen-displaying lipid-enveloped PLGA nanoparticles as delivery agents for a Plasmodium vivax malaria vaccine.
abstract: The parasite Plasmodium vivax is the most frequent cause of malaria outside of sub-Saharan Africa, but efforts to develop viable vaccines against P. vivax so far have been inadequate. We recently developed pathogen-mimicking polymeric vaccine nanoparticles composed of the FDA-approved biodegradable polymer poly(lactide-co-glycolide) acid (PLGA) "enveloped" by a lipid membrane. In this study, we sought to determine whether this vaccine delivery platform could be applied to enhance the immune response against P. vivax sporozoites. A candidate malaria antigen, VMP001, was conjugated to the lipid membrane of the particles, and an immunostimulatory molecule, monophosphoryl lipid A (MPLA), was incorporated into the lipid membranes, creating pathogen-mimicking nanoparticle vaccines (VMP001-NPs). Vaccination with VMP001-NPs promoted germinal center formation and elicited durable antigen-specific antibodies with significantly higher titers and more balanced Th1/Th2 responses in vivo, compared with vaccines composed of soluble protein mixed with MPLA. Antibodies raised by NP vaccinations also exhibited enhanced avidity and affinity toward the domains within the circumsporozoite protein implicated in protection and were able to agglutinate live P. vivax sporozoites. These results demonstrate that these VMP001-NPs are promising vaccines candidates that may elicit protective immunity against P. vivax sporozoites.
authors.affiliation: Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America.
authors.forename: James J
authors.initials: JJ
authors.lastname: Moon
authors.forename: Heikyung
authors.initials: H
authors.lastname: Suh
authors.forename: Mark E
authors.initials: ME
authors.lastname: Polhemus
authors.forename: Christian F
authors.initials: CF
authors.lastname: Ockenhouse
authors.forename: Anjali
authors.initials: A
authors.lastname: Yadava
authors.forename: Darrell J
authors.initials: DJ
authors.lastname: Irvine
mesh_terms: D000818:Animals; D019344:Lactic Acid / Q000737:chemistry*; D017780:Malaria Vaccines / Q000008:administration & dosage* / Q000737:chemistry; D016780:Malaria, Vivax / Q000517:prevention & control*; D051379:Mice; D053758:Nanoparticles / Q000737:chemistry*; D010966:Plasmodium vivax / Q000276:immunology*; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D034101:Sporozoites / Q000276:immunology
chemical_list: D017780:Malaria Vaccines; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid