With the preparation method chosen, lipoplex- and polyplex-loaded collagen sponges are superior in mediating sustained gene delivery in vitro and local transfection in vivo as compared to naked DNA-loaded sponges. Protective copolymers are particularly advantageous in promoting the tranfection capacity of polyplex-loaded sponges upon subcutaneous implantation, likely due to their stabilizing and opsonization-inhibiting properties.
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