4.7 Article

Topical Therapy with Antisense Tumor Necrosis Factor Alpha Using Novel β-Glucan-Based Drug Delivery System Ameliorates Intestinal Inflammation

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Publisher

MDPI
DOI: 10.3390/ijms21020683

Keywords

inflammatory bowel disease; antisense therapy; drug delivery system

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  1. [25460963]

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Anti-tumor necrosis factor alpha (TNF-alpha) antibodies are effective in patients with inflammatory bowel disease (IBD). However, the effect is not optimal because a sufficient concentration of antibodies cannot be maintained at the site of inflammation. Thus, a macromolecular complex was developed with schizophyllan (SPG) and antisense oligonucleotides. In the present study, an SPG-antisense TNF-alpha complex was prepared, and its therapeutic efficacy was examined using a dextran sodium sulfate (DSS)-induced colitis model. The TNF-alpha production in CD11b+ macrophages significantly increased in the colon of DSS-treated mice. Dectin-1, a receptor of SPG, binds with SPG and is subsequently taken into the cells via phagocytosis. The expression of dectin-1 by CD11b+ macrophages significantly increased in DSS-treated mice. Flow cytometry revealed that the uptake of SPG-antisense TNF-alpha in the macrophages was efficient. TNF-alpha production was suppressed significantly by SPG-antisense TNF-alpha in vitro, which was administered via enema to evaluate its efficacy. The intrarectal administration of SPG-antisense TNF-alpha ameliorated the intestinal inflammation. In this study, we showed that the delivery system that conjugates SPG and antisense can have higher therapeutic efficacy. Thus, the new therapeutic approach presented in this study may be used in the management of IBD.

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