title: Cytosolic delivery mediated via electrostatic surface binding of protein, virus, or siRNA cargos to pH-responsive core-shell gel particles.
abstract: We recently described a strategy for intracellular delivery of macromolecules, utilizing pH-responsive "core-shell" structured gel particles. These cross-linked hydrogel particles disrupt endosomes with low toxicity by virtue of physical sequestration of an endosome-disrupting "proton sponge" core inside a nontoxic hydrophilic shell. Here we tested the efficacy of this system for cytosolic delivery of a broad range of macromolecular cargos, and demonstrate the delivery of proteins, whole viral particles, or siRNA oligonucleotides into the cytosol of dendritic cells and epithelial cells via core-shell particles. We assessed the functional impact of particle delivery for vaccine applications and found that cytosolic delivery of protein antigens in dendritic cells via the core-shell particles promotes priming of CD8(+) T-cells at 100-fold lower doses than soluble protein. Functional gene knockdown following delivery of siRNA using the particles was demonstrated in epithelial cells. Based on these findings, these materials may be of interest for a broad range of biomedical applications.
authors.affiliation: Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
authors.forename: Yuhua
authors.initials: Y
authors.lastname: Hu
authors.forename: Prabhani U
authors.initials: PU
authors.lastname: Atukorale
authors.forename: James J
authors.initials: JJ
authors.lastname: Lu
authors.forename: James J
authors.initials: JJ
authors.lastname: Moon
authors.forename: Soong Ho
authors.initials: SH
authors.lastname: Um
authors.forename: Eun Chol
authors.initials: EC
authors.lastname: Cho
authors.forename: Yana
authors.initials: Y
authors.lastname: Wang
authors.forename: Jianzhu
authors.initials: J
authors.lastname: Chen
authors.forename: Darrell J
authors.initials: DJ
authors.lastname: Irvine
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000378:metabolism; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000378:metabolism; D003600:Cytosol / Q000737:chemistry*; D003713:Dendritic Cells / Q000502:physiology / Q000821:virology; D016503:Drug Delivery Systems / Q000379:methods*; D011992:Endosomes / Q000502:physiology / Q000821:virology; D005260:Female; D005782:Gels / Q000737:chemistry*; D055785:Gene Knockdown Techniques; D006863:Hydrogen-Ion Concentration; D009980:Influenza A virus / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D009000:Monocytes / Q000166:cytology / Q000378:metabolism; D053758:Nanoparticles / Q000737:chemistry / Q000648:ultrastructure; D010047:Ovalbumin / Q000378:metabolism*; D034741:RNA, Small Interfering / Q000494:pharmacology*; D011948:Receptors, Antigen, T-Cell / Q000502:physiology; D055672:Static Electricity; D013499:Surface Properties
chemical_list: D005782:Gels; D034741:RNA, Small Interfering; D011948:Receptors, Antigen, T-Cell; D010047:Ovalbumin