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Placental Extracellular Vesicles Can Be Loaded with Plasmid DNA
Matthew Kang1, Colin Hisey1,2, Bridget Tsai1
1Department of Obstetrics and Gynaecology, University of Auckland, Auckland, 1023 New Zealand.
Molecular Pharmaceutics
|March 15, 2023
Summary
Placental extracellular vesicles (EVs) offer a promising solution for large-scale production and safe gene therapy delivery. Researchers successfully loaded plasmid DNA into placental EVs, demonstrating their potential as effective DNA delivery vehicles.
Area of Science:
- Biotechnology
- Nanomedicine
- Gene Therapy
Background:
- Extracellular vesicles (EVs) are explored for drug delivery, but scalable production remains a challenge.
- Placental EVs are immunologically privileged, suggesting reduced inflammatory responses and immune clearance.
- Current EV generation methods limit large-scale production for therapeutic applications.
Purpose of the Study:
- To evaluate placental explant cultures as an efficient method for large-scale EV production.
- To investigate placental EVs as safe and effective vehicles for delivering large exogenous plasmids.
- To optimize plasmid DNA loading into placental EVs.
Main Methods:
- Compared EV production from placental explant cultures versus placental cells in monolayer cultures.
- Employed three strategies for loading plasmid DNA into placental EVs: electroporation of placental tissue, electroporation of EVs, and direct incubation of EVs in plasmid solution.
- Analyzed EV quantity, size, and plasmid DNA loading efficiency based on DNA dose and size.
Main Results:
- Placental explant cultures yielded significantly higher quantities of EVs compared to monolayer cultures.
- Successful plasmid DNA loading into both large and small placental EVs was achieved using exogenous loading strategies.
- Loading efficiency was dependent on exogenous plasmid DNA dose and size, with larger EVs encapsulating more plasmid DNA.
- Direct incubation did not affect EV quantity or size.
Conclusions:
- Placental explant cultures provide an efficient method for scalable production of extracellular vesicles.
- Placental EVs demonstrate significant potential as safe and effective vehicles for delivering large exogenous plasmids in gene therapy.
- Exogenous loading strategies, particularly those targeting larger EVs, show promise for optimizing DNA delivery capacity.
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