Abstract
Cyclodextrins (CDs) have been applied widely as an oral micro-nano drug delivery material for the treatment of ulcerative colitis (UC) because of their stability around the stomach. However, the further application of CDs is hindered due to their inherent poor targeting and controlled release properties. In this study, CD-supramolecular nanoparticles (HA-CsT@RH) were developed based on the structural characteristics of CDs (e.g., multi-group modifiability and hydrophobic cavity) to encapsulate rhein (RH) for oral delivery against UC. The HA-CsT@RH showed an average size of 154.70 ± 1.80 nm and exhibited high encapsulation efficiency (95.55 ± 2.37 %). When incubated in simulated gastric fluid for 2 h, HA-CsT@RH only released 20.3 ± 0.47 % RH due to the protection of supramolecular effects of CDs. However, RH was rapidly released from HA-CsT@RH (released 66.3 ± 2.50 %) after H2O2 was treated with the assistance of the ROS-sensitive properties. Moreover, HA-CsT@RH were taken up by macrophages in 1.5 times higher amounts than preparations which did not have CD44-targeted effects. Notably, the results showed that HA-CsT@RH with an accurate on-demand drug release strategy achieved the best anti-inflammatory and antioxidant effects, and they are expected to be a promising carrier in the UC treatment.
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