Abstract
In situ gelling eye drops of tacrolimus (FK506 Gel) were developed to address the formulation challenge of tacrolimus for anterior ocular inflammatory diseases. Both in silico and in vitro investigations were conducted to screen a suitable cyclodextrin species to increase the drug solubility. Guanosine was employed as the gelator and combined with inclusion complexes of tacrolimus in the presence of borate anions to obtain FK506 Gel, which gelated when came into contact with cations in tear fluid and led to the formation of a nanofibrous hydrogel. The versatility of our design to improve the solubility and ocular retention of the hydrophobic drug was demonstrated in vivo with coumarin 6 as a model drug. A mouse dry eye model was used to evaluate the therapeutic effects of FK506 Gel, which, in combination with the biocompatibility study, suggested that FK506 Gel served as a superior treatment for anterior ocular inflammatory diseases.
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