TITLE

Local delivery of adenoviral vectors encoding murine interleukin 10 induces colonic interleukin 10 production and is therapeutic for murine colitis

AUTHOR(S)
Lindsay, J.O.; Ciesielski, C.J.; Scheinin, T.; Brennan, F.M.; Hodgson, H.J.
PUB. DATE
July 2003
SOURCE
Gut;Jul2003, Vol. 52 Issue 7, p981
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Introduction: Interleukin 10 knockout (IL-10-/-) mice spontaneously develop a Th1 T cell mediated colitis with many similarities to Crohn's disease. Daily injections of IL-10 are unable to induce remission in mice with established disease. In contrast, we have shown previously that intravenous administration of adenoviral vectors encoding IL-10 (AdvmulL-10) induces hepatic IL-10 release and leads to long term disease suppression with profound systemic immunoregulatory changes. Aims: To determine whether rectal delivery of AdvmulL-10 induces localised colonic IL-10 expression without systemic immune suppression, and assess its therapeutic efficacy in IL-10-/-mice with established colitis. Results: A single rectal infusion of 5×10[sup 8] PFU AdvmulL-10 to 10 week IL-10-/-mice resulted in a median level of 27.3 pg/mg IL-10 in colonic homogenates harvested one week later. IL-10-/-mice with established colitis treated with an enema of 5×10[sup 8] PFU AdvmulL-10 entered clinical and histological remission whereas empty cassette adenovirus (Adv0) or phosphate buffered saline (PBS) treated mice developed progressive disease. After four weeks, the histological score of AdvmulL-10 treated mice (4.4 (1.5)) was significantly lower than that of Adv0 (11.1 (1.1); p < 0.001) and PBS (10.9 (1.0); p < 0.01) treated controls. In addition, the stool concentration of IL-1β over the four week experiment was significantly higher in mice treated with saline or Adv0 than in those treated with AdvmulL-10 (p < 0.01). Conclusion: Local AdvmulL-10 therapy reverses colitis in IL-10-/-mice without the systemic effects seen after intravenous administration. Gene therapy strategies using adenoviral vectors encoding immunoregulatory cytokines may prove to be a potent approach to the treatment of chronic inflammatory diseases such as Crohn's disease.
ACCESSION #
10998103

 

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