Pharmaceutical evaluation of gas-filled microparticles as gene delivery system.

Abstract:

PURPOSE:To produce and characterize a nonviral ultrasound-controlled release system of plasmid DNA (pDNA) encapsulated in gas-filled poly(D,L-lactide-co-glycolide) microparticles (PLGA-MPs). METHODS:Different cationic polymers were used to form pDNA/polymer complexes to enhance the stability of pDNA during microparticle preparation. The physico-acoustical properties of the microparticles, particle size, pDNA integrity, encapsulation efficiency and pDNA release behavior were studied in vitro. RESULTS:The microparticles had an average particle size of around 5 microm. More than 50% of all microparticles contained a gas core, and when exposed to pulsed ultrasound as used for color Doppler imaging create a signal that yields typical color patterns (stimulated acoustic emission) as a result of the ultrasound-induced destruction of the microparticles. Thirty percent of the pDNA used was successfully encapsulated and approximately 10% of the encapsulated pDNA was released by ultrasound within 10 min. CONCLUSIONS:Plasmid DNA can be encapsulated in biodegradable gas-filled PLGA-MPs without hints for a structural disintegration. A pDNA release by ultrasound-induced microparticle-destruction could be shown in vitro.

journal_name

Pharm Res

journal_title

Pharmaceutical research

authors

Seemann S,Hauff P,Schultze-Mosgau M,Lehmann C,Reszka R

doi

10.1023/a:1014430631844

subject

Has Abstract

pub_date

2002-03-01 00:00:00

pages

250-7

issue

3

eissn

0724-8741

issn

1573-904X

journal_volume

19

pub_type

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