Controlled In Vitro Delivery of Voriconazole and Diclofenac to the Cornea using Contact Lenses for the Treatment of Acanthamoeba Keratitis

Publication date: Available online 31 January 2020Source: International Journal of PharmaceuticsAuthor(s): Siân R. Morgan, Nicole Pilia, Melissa Hewitt, Rachael L. Moses, Ryan Moseley, Philip N. Lewis, Peter W.J. Morrison, Steven L. Kelly, Josie E. Parker, David Whitaker, Andrew J. Quantock, Charles M. HeardAbstractAcanthamoeba keratitis is caused by a protozoal infection of the cornea, with 80% of cases involving the improper use of contact lenses. The infection causes intense pain and is potentially blinding. However, early diagnosis improves treatment efficacy and the chances of healing. Despite the apparent accessibility of the cornea, patients do not always respond well to current eye drop treatments largely due to rapid dose loss due to blinking and nasolacrimal drainage. Here, the topical drug delivery of voriconazole alone and in combination with diclofenac via drug-loaded contact lenses, were investigated in vitro. The contact lenses were applied onto excised porcine eyeballs and maintained at 32°C under constant irrigation, with simulated tear fluid applied to mimic in vivo conditions. The drug delivered to the corneas was quantified by HPLC analysis. The system was further tested in terms of cytotoxicity and a scratch wound repopulation model, using corneal epithelial cells. Sustained drug delivery to the cornea was achieved and for voriconazole, the MIC against Acanthamoeba castellanii was attained alone and in combination with diclofenac. MTT and scratch wound ...
Source: International Journal of Pharmaceutics - Category: Drugs & Pharmacology Source Type: research