PEGylated adenoviruses for gene delivery to the intestinal epithelium by the oral route.

Abstract:

PURPOSE:Adenoviruses are being developed for diseases of the gastrointestinal tract. Several in vitro assays were used to predict stability of PEGylated adenovirus along the GI tract and determine in vivo gene transfer after oral administration. METHODS:Recombinant adenovirus was modified with monomethoxypoly(ethylene) glycols activated by cyanuric chloride, succinimidyl succinate, and tresyl chloride. Transduction efficiency was assessed on Caco-2 cells. In vitro stability of viruses in simulated gastric fluid, pancreatic fluid, and bile was assessed by serial dilution on 293 cells. Transduction efficiency in vivo was determined by oral administration of 1 x 10(12) particles of unmodified or PEGylated virus to fasted Sprague-Dawley rats. RESULTS:Titers of unmodified virus declined to undetectable levels after 40 min in simulated gastric fluid while the infectious titer of the modified vectors did not change for 3 h. Similar results were seen with simulated pancreatic fluid. PEGylation also enhanced adenoviral transduction efficiency in Caco-2 cells by a factor of 20. PEGylation enhanced adenovirus transduction efficiency 10- to 40-fold in vivo in intestinal segments that do not express significant amounts of adenovirus receptors (jejunum, colon) with transgene expression located in the crypt regions. CONCLUSIONS:PEGylated adenoviruses are suitable gene delivery vehicles for oral administration.

journal_name

Pharm Res

journal_title

Pharmaceutical research

authors

Cheng X,Ming X,Croyle MA

doi

10.1023/a:1025714412337

subject

Has Abstract

pub_date

2003-09-01 00:00:00

pages

1444-51

issue

9

eissn

0724-8741

issn

1573-904X

journal_volume

20

pub_type

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