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Gene-therapy Inspired Polycation Coating for Protection of DNA Origami Nanostructures
Published on: January 19, 2019
A covalently stabilized lipid-polycation-DNA (sLPD) vector for antisense oligonucleotide delivery
Xiaojuan Yang1, Yong Peng, Bo Yu
1Division of Pharmaceutics, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, USA.
Molecular Pharmaceutics
|March 4, 2011
Summary
Novel nanoparticles effectively deliver G3139 to cancer cells, significantly downregulating Bcl-2. These stabilized lipid-polycation-DNA (sLPD) nanoparticles also demonstrated potent in vivo antitumor activity, suggesting an immune-mediated mechanism.
Area of Science:
- Nanomedicine
- Cancer Therapeutics
- Oligonucleotide Delivery
Background:
- Antisense oligonucleotide G3139 targets Bcl-2 for cancer therapy and activates toll-like receptors.
- Effective delivery of G3139 is crucial for its therapeutic potential.
- Lipid-polycation-DNA (LPD) nanoparticles are investigated for drug delivery applications.
Purpose of the Study:
- To develop and characterize novel stabilized LPD (sLPD) nanoparticles for G3139 delivery.
- To evaluate the in vitro efficacy of sLPD-G3139 in human carcinoma KB cells.
- To assess the in vivo therapeutic potential and underlying mechanisms of sLPD-G3139 in a mouse tumor model.
Main Methods:
- sLPD nanoparticles were formulated using DOTAP/DDAB/Chol/TPGS/linoleic acid/hexadecenal and Polyethylenimine (PEI).
- Nanoparticle stabilization was achieved via a reversible covalent bond between hexadecenal and PEI.
- In vitro transfection of KB cells and in vivo efficacy studies in mice bearing KB tumors were performed.
Main Results:
- sLPD-G3139 achieved 90.4% Bcl-2 downregulation in KB cells, significantly higher than free G3139 or non-stabilized LPD-G3139.
- In vivo studies showed sLPD-G3139 inhibited tumor growth and increased lifespan by 72% in mice.
- Antitumor activity in vivo correlated with increased cytokine induction, suggesting an immunological response.
Conclusions:
- Stabilized LPD nanoparticles provide an effective platform for delivering G3139, enhancing its anticancer efficacy.
- The observed in vivo antitumor effects are likely mediated by an immune response rather than direct Bcl-2 downregulation.
- sLPD-G3139 holds promise as an immunotherapeutic agent for cancer treatment.
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