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Multivalent dendrimer vectors with DNA intercalation motifs for gene delivery
Pamela T Wong1, Kenny Tang, Alexa Coulter
1Michigan Nanotechnology Institute for Medicine and Biological Sciences and ‡Department of Internal Medicine, University of Michigan Medical School , Ann Arbor, Michigan 48109, United States.
Biomacromolecules
|October 7, 2014
Summary
This study introduces novel Poly(amido amine) (PAMAM) dendrimers for targeted gene delivery, incorporating DNA intercalation and receptor recognition. Riboflavin-conjugated dendrimers significantly enhanced gene transfection in cancer cells.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Molecular Biology
Background:
- Poly(amido amine) (PAMAM) dendrimers are effective nonviral vectors for gene delivery.
- Targeted delivery requires specific cell receptor recognition.
- Current dendrimer designs often lack dual functionality for both DNA binding and targeting.
Purpose of the Study:
- To design and synthesize novel dendrimer conjugates with dual binding motifs for enhanced gene delivery.
- To incorporate DNA intercalation and specific receptor targeting ligands (folate and riboflavin) onto a G5 PAMAM dendrimer.
- To evaluate the efficiency and targeting capability of these novel dendrimer vectors in vitro.
Main Methods:
- Synthesis of G5 PAMAM dendrimers conjugated with folate (FA) or riboflavin (RF) ligands and 3,8-diamino-6-phenylphenanthridinium (DAPP) for DNA anchoring.
- Characterization of dendrimer-DNA polyplexes using Surface Plasmon Resonance (SPR) spectroscopy, Dynamic Light Scattering (DLS), and zeta potential measurements.
- In vitro transfection assays using a luciferase-encoding plasmid in KB cancer cells.
Main Results:
- Polyplex formation was confirmed by tight DNA-dendrimer adhesion and changes in particle size and surface charge.
- SPR studies showed minimal impact of the DNA payload on folate receptor binding affinity (KD = 0.22 nM for G5(FA)(DAPP) polyplex).
- Riboflavin-conjugated dendrimers demonstrated 10-100 fold higher efficiency in luciferase gene transfection compared to controls.
Conclusions:
- The study presents a proof-of-concept for DNA-ligand intercalation in multivalent dendrimer vector design.
- Dual-motif dendrimers offer a promising strategy for targeted gene delivery with enhanced transfection efficiency.
- Riboflavin-conjugated dendrimers show significant potential for cancer gene therapy applications.
