Transforming growth factor-beta gene therapy ameliorates experimental colitis in rats.

Abstract:

OBJECTIVE:To modulate experimental colitis by the direct intramuscular injection of cDNA expression vector encoding transforming growth factor-beta 1. METHODS:Colitis was induced in rats by the intracolonic administration of 0.25 ml 50% ethanol containing 30 mg trinitrobenzene sulfonic acid. Three and 10 days later the rats were injected intramuscularly with 200 micrograms transforming growth factor-beta 1 cDNA subcloned to the pRSV expression vector (pRSVTGF-beta 1). Control rats were injected with pRSVP2. The rats were sacrificed 2 weeks after trinitrobenzene sulfonic acid treatment and a 10 cm long distal colonic segment was resected, weighted, the lesion area measured, sections obtained for histology and the mucosa extracted for determination of myeloperoxidase activity and leukotriene generation. RESULTS:In pRSVP2-treated rats (n = 17) the colon was inflamed and ulcerated with many adhesions to adjacent structures; the pRSVTGF-beta 1-treated rats (n = 21) had minimal swelling and inflammation in the colon. On histological examination 50% of the pRSVTGF-beta 1-treated rats had minimal or no ulceration, whereas 83% of the pRSVP2-treated rats had a maximal damage score. In pRSVTG-beta 1-treated rats the lesion area and wet weight were 21 and 52.5%, respectively, of the values for pRSVP2-treated rats (P < 0.05). The amelioration of tissue injury was accompanied by a significant decrease in mucosal leukotriene C4 generation. CONCLUSIONS:Direct intramuscular transforming growth factor-beta 1 gene delivery effectively ameliorates trinitrobenzene sulfonic acid-induced colitis, suggesting that gene therapy with immunosuppressive cytokines may be a novel approach for the treatment of inflammatory bowel disease.

authors

Giladi E,Raz E,Karmeli F,Okon E,Rachmilewitz D

subject

Has Abstract

pub_date

1995-04-01 00:00:00

pages

341-7

issue

4

eissn

0954-691X

issn

1473-5687

journal_volume

7

pub_type

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