Poloxamer 407/TPGS Mixed Micelles as Promising Carriers for Cyclosporine Ocular Delivery

Molecular Pharmaceutics
Maria A GrimaudoSara Nicoli

Abstract

Cyclosporine is an immunosuppressant agent approved for the treatment of dry eye disease and used off-label for other ocular pathologies. Its formulation and ocular bioavailability present a real challenge due to the large molecular weight (1.2 kDa), high lipophilicity, and low water solubility. The aim of the work was to develop an aqueous micellar formulation for an efficient cyclosporine delivery to the ocular tissues, using a water-soluble derivative of vitamin E (TPGS: d-α-tocopheryl polyethylene glycol 1000 succinate) and poloxamer 407 (Pluronic ®F127) as excipients. The mixed micelles were characterized in terms of particle size, zeta potential, rheology, and stability upon dilution and freeze-drying. Additionally, the enzymatic-triggered release of vitamin E and vitamin E succinate from TPGS was investigated in vitro in the presence of esterase. Compared to the commercially available ophthalmic formulation, the poloxamer 407:TPGS 1:1 molar ratio micellar formulation significantly improved cyclosporine solubility, which increased proportionally to surfactant concentration reaching 0.4% (w/v) for 20 mM surfactant total concentration. Cyclosporine-loaded mixed micelles efficiently retained the drug once diluted in simulate...Continue Reading

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Citations

Mar 9, 2018·International Journal of Molecular Sciences·Ana Rey-Rico, Magali Cucchiarini
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