Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12857/116757
Title: Novel Oligo-Guanidyl-PEG Carrier Forming Rod-Shaped Polyplexes
Authors: Malfanti, Alessio 
Mastrotto, Francesca 
Han, Yanxiao
Král, Petr
Balasso, Anna
Scomparin, Anna 
Pozzi, Sabina
Satchi-Fainaro, Ronit
Salmaso, Stefano 
Caliceti, Paolo 
Keywords: cationic carriers;nanoparticles;nonviral carriers;oligonucleotides delivery;polyplexes
Keywords Plus: GENE DELIVERY;CELLULAR UPTAKE;TRANSFECTION EFFICIENCY;BLOCK-COPOLYMERS;VIRAL VECTORS;PLASMID DNA;IN-VIVO;SIRNA;NANOPARTICLES;POLYMERS
Issue Date: 2019
Publisher: AMER CHEMICAL SOC
Journal: Molecular pharmaceutics 
Abstract: 
A novel unconventional supramolecular oligo-cationic structure (Agm6-M-PEG-OCH3) has been synthesized to yield high efficiency therapeutic oligonucleotide (ON) delivery. Agm6-M-PEG-OCH3 was obtained by a multistep protocol that included the conjugation of agmatine (Agm) moieties to maltotriose (M), which was further derivatized with one poly(ethylene glycol) (PEG) chain. Gel electrophoresis analysis showed that the 19 base pairs dsDNA model ON completely associates with Agm6-M-PEG-OCH3 at 3 N/P molar ratio, which is in agreement with the in silico molecular predictions. Isothermal titration calorimetry (ITC) analyses showed that the Agm6-M-PEG-OCH3/ON association occurs through a combination of mechanisms depending on the N/P ratios resulting in different nanostructures. Dynamic light scattering (DLS) and transmission electron microscopy (TEM) revealed that the Agm6-M-PEG-OCH3/ON polyplexes have rod-shape structure with a mean diameter of 50-75 nm and aspect ratio depending on the N/P ratio. The polyplexes were stable over time in buffer, while a slight size increase was observed in the presence of serum proteins. Cell culture studies showed that neither Agm6-M-PEG-OCH3 nor polyplexes displayed cytotoxic effects. Cellular uptake depended on the cell line and polyplex composition: cellular internalization was higher in the case of MCF-7 and KB cells compared to MC3T3-E1 cells and polyplexes with smaller aspect ratio were taken-up by cells more efficiently than polyplexes with higher aspect ratio. Finally, preliminary studies showed that our novel carrier efficiently delivered ONs into cells providing gene silencing.
URI: http://hdl.handle.net/20.500.12857/116757
ISSN: 15438384
DOI: 10.1021/acs.molpharmaceut.9b00014
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