Stable and monodisperse lipoplex formulations for gene delivery.

Abstract:

:A stable single vial lipoplex formulation has been developed that can be stored frozen without losing either biological activity or physical stability. This formulation was identified by systematically controlling several formulation variables and without introducing either stabilizers or surfactants. Analytical assays were used to unambiguously characterize the formulations. The critical formulation parameters were: (1) the size of the cationic liposomes; (2) the rate and method of DNA and cationic liposome mixing; and (3) the ionic strength of the suspending vehicle. The mixing conditions were precisely controlled by using a novel, specially designed continuous flow pumping system in which the DNA and liposome solutions were mixed at the junction of a T-connector. Homogenous cationic liposome preparations were prepared by extrusion in two different size ranges of either 400 or 100 nm. Extruded liposomes produced more monodisperse and physically stable lipoplex formulations than unextruded liposomes, but the formulations prepared with 100 nm liposomes were less active in in vitro transfection assays than either the 400 nm or unextruded liposomes. Low ionic strength and 5% sorbitol were required for the lipoplex formulations to survive freezing and thawing. A frozen lipoplex formulation stored for more than a year maintained its biological activity. These results have broad implications for the pharmaceutical development of lipoplex formulations for gene delivery.

journal_name

Gene Ther

journal_title

Gene therapy

authors

Zelphati O,Nguyen C,Ferrari M,Felgner J,Tsai Y,Felgner PL

doi

10.1038/sj.gt.3300707

subject

Has Abstract

pub_date

1998-09-01 00:00:00

pages

1272-82

issue

9

eissn

0969-7128

issn

1476-5462

journal_volume

5

pub_type

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