Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2003: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2002: ¥1,200,000 (Direct Cost: ¥1,200,000)
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Research Abstract |
We developed the drug delivery system with microcapsules targeting gastrointestinal lymphoid tissues, which play an important role in mucosal immune-response, for getting more therapeutic efficacy of immuno modulators with avoiding the side effects. In this study, we have successfully incorporated FK506 into these microcapsules (FK506 microcapsules). And the therapeutic and pharmacokinetic effects of oral administration of FK506 microcapsules on dextran sulfate sodium (DSS)-induced coltis and 2,4,6-trinitrobenzene sulfonic acid (TNBS)-induced colitis were examined. (Results) No significant elevation of FK506 in plasma was observed after administration of FK506 microcapsules. Histological score is significantly lower in the groups treated with FK506 microcapsules (FK506-MS) than in non-treated group. Compared to non-treated group, MPO activity and NO production of colonic tissue were significantly decreased in the groups treated with FK506-MS as well as the expression of proinflammatory cytokines. Moreover, transcriptional factor, T-bet and NF-kappa B expression, which are mainly involved in expressions of Th1 cytokines, were decreased in the group treated with FK506-MS. These results suggested that treatment with FK506-MS might have a potent effect on improving experimental colitis without systemic adverse effects. Now, we have already started to investigate the effect of FK506-MS on interleukin-10 knock out mice, which mostly resemble human Crohn's disease.
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