title: PEGylation of cationic, shell-crosslinked-knedel-like nanoparticles modulates inflammation and enhances cellular uptake in the lung.
abstract: The airway provides a direct route for administration of nanoparticles bearing therapeutic or diagnostic payloads to the lung, however optimization of nanoplatforms for intracellular delivery remains challenging. Poly(ethylene glycol) (PEG) surface modification improves systemic performance but less is known about PEGylated nanoparticles administered to the airway. To test this, we generated a library of cationic, shell crosslinked knedel-like nanoparticles (cSCKs), including PEG (1.5 kDa PEG; 2, 5, 10 molecules/polymer arm) on the outer shell. Delivery of PEGylated cSCK to the mouse airway showed significantly less inflammation in a PEG dose-dependent manner. PEGylation also enhanced the entry of cSCKs in lung alveolar epithelial cells and improved surfactant penetration. The PEGylation effect could be explained by the altered mechanism of endocytosis. While non-PEGylated cSCKs used the clathrin-dependent route for endocytosis, entry of PEGylated cSCK was clathrin-independent. Thus, nanoparticle surface modification with PEG represents an advantageous design for lung delivery.
  
  
  BACKGROUND
  In this study, the effects of PEGylation were studied on cross linked knedel-like nanoparticles in drug delivery through the lungs, demonstrating less airway inflammation in the studied model than with non-PEGylated nanoparticles, which suggests an overall favorable profile of PEGylated nanoparticles for alveolar delivery.
authors: Department of Internal Medicine, Washington University, St. Louis, Missouri, USA.
authors: Aida
authors: A
authors: Ibricevic
authors: Sean P
authors: SP
authors: Guntsen
authors: Ke
authors: K
authors: Zhang
authors: Ritu
authors: R
authors: Shrestha
authors: Yongjian
authors: Y
authors: Liu
authors: Jing Yi
authors: JY
authors: Sun
authors: Michael J
authors: MJ
authors: Welch
authors: Karen L
authors: KL
authors: Wooley
authors: Steven L
authors: SL
authors: Brody
mesh_terms: D056809:Alveolar Epithelial Cells / Q000378:metabolism / Q000473:pathology; D000818:Animals; D002412:Cations; D002460:Cell Line; D003432:Cross-Linking Reagents / Q000737:chemistry*; D016503:Drug Delivery Systems; D004705:Endocytosis; D007249:Inflammation / Q000473:pathology*; D042541:Intracellular Space / Q000378:metabolism; D008168:Lung / Q000473:pathology*; D051379:Mice; D008810:Mice, Inbred C57BL; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D011092:Polyethylene Glycols / Q000737:chemistry*
chemical_list: D002412:Cations; D003432:Cross-Linking Reagents; D011092:Polyethylene Glycols
keywords: Airway; Alveolar epithelial cells; BAL; CPM; MDC; Macrophage; MβCD; NP; PEG; Poly(ethylene glycol); SD; Surfactant; bronchoalveolar lavage; cSCK; cationic shell crosslinked knedel-like; chlorpromazine; methyl-β-cyclodextran; monodansylcadaverine; nanoparticle; poly(ethylene glycol); standard deviation