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Beneficial anti-inflammatory effect of paeonol self-microemulsion-loaded colon-specific capsules on experimental ulcerative colitis rats.
Artificial Cells, Nanomedicine, and Biotechnology 2018 January 10
Paeonol, as the main phenolic compound isolated from the Chinese herbs, has been confirmed to present anti-inflammatory effects on ulcerative colitis (UC) in our previous study. However, its poor solubility has hindered its development of being a favourable pharmaceutical product in treating colon diseases. In this study, we prepared the colon-specific delivery system (Pae-SME-CSC) with paeonol-loaded self-microemulsion (Pae-SMEDDS), and evaluated its in vitro and in vivo properties, especially the anti-inflammatory effects on UC rats. The anti-inflammatory effects were evaluated by the disease activity index, colon weight/length ratio, and macroscopic damage and microscopic damage scores. IL-17, IL-6, and TGF-β1 levels were also determined by enzyme-linked immunosorbent assay. The results showed that Pae-SME-CSC had good colon-targeting property in vivo and in vitro, with favourable stability. Efficacy evaluation showed that the dose of the paeonol group (100 mg/kg) exhibited no significant effect on UC (p > .05, compared with the model group), while the Pae-SME-CSC group (100 mg/kg) showed better anti-UC effects (p < .01 or p < .05), and its anti-inflammatory effect was close to that of the paeonol group (200 mg/kg) (p > .05). These results indicated that the developed Pae-SME-CSC was suitable for colon-specific drug delivery.
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