Efficient gene delivery to the inflamed colon by local administration of recombinant adenoviruses with normal or modified fibre structure.

Abstract:

BACKGROUND/AIMS:Replication deficient recombinant adenoviruses represent an efficient means of transferring genes in vivo into a wide variety of dividing and quiescent cells from many different organs. Although the gastrointestinal tract is a potentially attractive target for gene therapy approaches, only a few studies on the use of viral gene transfer vehicles in the gut have been reported. The prospects of using recombinant adenoviruses for gene delivery into epithelial and subepithelial cells of the normal and inflamed colon are here analysed. METHODS:An E1/E3 deleted recombinant adenovirus (denoted AdCMVbetaGal) and an adenovirus with modified fibre structure (denoted AdZ.F(pk7)) both expressing the bacterial lacZ gene under the control of a human cytomegalovirus promoter were used for reporter gene expression in vitro and in vivo. beta-Galactosidase activity was determined by specific chemiluminescent reporter gene assay. RESULTS:Intravenous or intraperitoneal injection of AdCMVbetaGal into healthy Balb/c mice caused strong reporter gene expression in the liver and spleen but not in the colon. In contrast, local administration of AdCMVbetaGal resulted in high reporter gene expression in colonic epithelial cells and lamina propria mononuclear cells. A local route of adenovirus administration in mice with experimental colitis induced by the hapten reagent trinitrobenzenesulphonic acid was next evaluated. Interestingly, rectal administration of AdCMVbetaGal caused a higher beta-galactosidase activity in isolated lamina propria cells from infected mice with experimental colitis than in those from controls. Furthermore, isolated lamina propria cells from mice with colitis infected in vitro showed a significant increase in reporter gene activity compared with controls. Finally, AdZ.F(pk7) adenoviruses with modified fibre structure produced 10- to 40-fold higher reporter gene activity in spleen T cells and lamina propria mononuclear cells of colitic mice compared with standard AdCMVbetaGal vectors. CONCLUSIONS:Local administration of recombinant adenoviruses with normal or modified fibre structure could provide a new reliable method for targeted gene expression in the inflamed colon. Such gene delivery could be used to specifically express signal transduction proteins with therapeutic potential in inflamed colonic tissue. In particular, adenoviruses with modified fibre structure may be useful in T cell directed therapies in intestinal inflammation.

journal_name

Gut

journal_title

Gut

authors

Wirtz S,Galle PR,Neurath MF

doi

10.1136/gut.44.6.800

keywords:

subject

Has Abstract

pub_date

1999-06-01 00:00:00

pages

800-7

issue

6

eissn

0017-5749

issn

1468-3288

journal_volume

44

pub_type

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