Lipid-Polyglutamate Nanoparticle Vaccine Platform.
Peptide-based subunit vaccines are attractive in view of personalized cancer vaccination with neo-antigens, as well as for the design of the newest generation of vaccines against infectious diseases. Key to mounting robust antigen-specific immunity is delivery of antigen to antigen-presenting (innate immune) cells in lymphoid tissue with concomitant innate immune activation to promote antigen presentation to T cells and to shape the amplitude and nature of the immune response. Nanoparticles that co-deliver both peptide antigen and molecular adjuvants are well suited for this task. However, in the context of peptide-based antigen, an unmet need exists for a generic strategy that allows for co-encapsulation of peptide and molecular adjuvants due to the stark variation in physicochemical properties based on the amino acid sequence of the peptide. These properties also strongly differ from those of many molecular adjuvants. Here, we devise a lipid nanoparticle (LNP) platform that addresses these issues. Key in our concept is poly(l-glutamic acid) (PGA), which serves as a hydrophilic backbone for conjugation of, respectively, peptide antigen (Ag) and an imidazoquinoline (IMDQ) TLR7/8 agonist as a molecular adjuvant. Making use of the PGA's polyanionic nature, we condensate PGA-Ag and PGA-IMDQ into LNP by electrostatic interaction with an ionizable lipid. We show in vitro and in vivo in mouse models that LNP encapsulation favors uptake by innate immune cells in lymphoid tissue and promotes the induction of Ag-specific T cells responses both after subcutaneous and intravenous administration.
['Van Lysebetten|Dorien|D|', 'Malfanti|Alessio|A|', 'Deswarte|Kim|K|', 'Koynov|Kaloian|K|http://orcid.org/0000-0002-4062-8834', 'Golba|Bianka|B|http://orcid.org/0000-0003-2468-7233', 'Ye|Tingting|T|', 'Zhong|Zifu|Z|', 'Kasmi|Sabah|S|', 'Lamoot|Alexander|A|', 'Chen|Yong|Y|http://orcid.org/0000-0002-7029-6201', 'Van Herck|Simon|S|', 'Lambrecht|Bart N|BN|', 'Sanders|Niek N|NN|http://orcid.org/0000-0003-4585-0343', 'Lienenklaus|Stefan|S|', 'David|Sunil A|SA|http://orcid.org/0000-0003-1655-4641', 'Vicent|María J|MJ|http://orcid.org/0000-0001-7771-3373', 'De Koker|Stefaan|S|', 'De Geest|Bruno G|BG|http://orcid.org/0000-0001-9826-6170']
D000276:Adjuvants, Immunologic D000818:Animals D002460:Cell Line D008055:Lipids D008214:Lymphocytes D051379:Mice D008807:Mice, Inbred BALB C D015394:Molecular Structure D053758:Nanoparticles D010316:Particle Size D011099:Polyglutamic Acid D000067996:RAW 264.7 Cells D013499:Surface Properties D014612:Vaccines
vaccine peptides lipid nanoparticles TLR agonists