Degradable Self-Assembling Dendrons for Gene Delivery: Experimental and Theoretical Insights into the Barriers to Cellular Uptake
摘要:
This paper uses a combined experimental and theoretical approach to gain unique insight into gene delivery. We report the synthesis and investigation of a new family of second-generation dendrons with four triamine surface ligands capable of binding to DNA, degradable aliphatic-ester dendritic scaffolds, and hydrophobic units at their focal points. Dendron self-assembly significantly enhances DNA binding as monitored by a range of experimental methods and confirmed by multiscale modeling. Cellular uptake studies indicate that some of these dendrons are highly effective at transporting DNA into cells (ca. 10 times better than poly(ethyleneimine), PEI). However, levels of transgene expression are relatively low (ca. 10% of PEI). This indicates that these dendrons cannot navigate all of the intracellular barriers to gene delivery. The addition of chloroquine indicates that endosomal escape is not the limiting factor in this case, and it is shown, both experimentally and theoretically, that gene delivery can be correlated with the ability of the dendron assemblies to release DNA. Mass spectrometric assays demonstrate that the dendrons, as intended, do degrade under biologically relevant conditions over a period of hours. Multiscale modeling of degraded dendron structures suggests that complete dendron degradation would be required for DNA release. Importantly, in the presence of the lower pH associated with endosomes, or when bound to DNA, complete degradation of these dendrons becomes ineffective on the transfection time scale we propose this explains the poor transfection performance of these dendrons. As such, this paper demonstrates that taking this kind of multidisciplinary approach can yield a fundamental insight into the way in which dendrons can navigate barriers to cellular uptake. Lessons learned from this work will inform future dendron design for enhanced gene delivery.
Double-degradable responsive self-assembled multivalent arrays – temporary nanoscale recognition between dendrons and DNA
作者:Anna Barnard、Paola Posocco、Maurizio Fermeglia、Ariane Tschiche、Marcelo Calderon、Sabrina Pricl、David K. Smith
DOI:10.1039/c3ob42202j
日期:——
This article reports self-assembling dendrons which bind DNA in a multivalent manner. The molecular design directly impacts on self-assembly which subsequently controls the way these multivalent nanostructures bind DNA – this can be simulated by multiscale modelling. Incorporation of an S–S linkage between the multivalent hydrophilic dendron and the hydrophobic units responsible for self-assembly allows
[EN] CARRIERS FOR EFFICIENT NUCLEIC ACID DELIVERY<br/>[FR] VECTEURS DESTINÉS À L'ADMINISTRATION EFFICACE D'ACIDES NUCLÉIQUES
申请人:TIBA BIOTECH LLC
公开号:WO2021207020A1
公开(公告)日:2021-10-14
Nanoparticle compositions for delivery of nucleic acids to subjects including carriers comprising polyester (PE) dendrimers or dendrons, and therapeutic or immunogenic nucleic acid agents enclosed within the PE are described. Methods for treating or preventing diseases or conditions in a subject by administering the nanoparticle compositions that provide immune responses and synergistic therapeutic or preventive effects are provided.
[EN] DENDRITIC ARCHITECTURES AS NONVIRAL VECTORS IN GENE DELIVERY<br/>[FR] ARCHITECTURES DENDRITIQUES EN TANT QUE VECTEURS NON VIRAUX DANS LA DISTRIBUTION DE GÈNES
申请人:[en]TIBA BIOTECH LLC
公开号:WO2022212838A1
公开(公告)日:2022-10-06
Disclosed herein are novel dendritic structures that can be used in combination with other lipid components to form nanoparticles with nucleic acids, to facilitate the intracellular delivery of nucleic acids bothin vitroandin vivo. Nanoparticle compositions comprising the compounds and methods for their use for treating or preventing diseases or conditions are also provided.
NANOPARTICLE COMPOSITION FOR THE DELIVERY OF NUCLEIC ACID AGENTS
申请人:Tiba Biotech LLC
公开号:US20230310645A1
公开(公告)日:2023-10-05
The present disclosure relates to nanoparticle compositions for delivery of nucleic acid agents. The nanoparticle composition disclosed includes a carrier containing a dendritic polymer skeleton, a PEG moiety, an amine, and a hydrophobic unit. The size of the PEG moiety may be limited, potentially reducing or avoiding anti-PEG antibody induction.