Cationic Nano-Lipidic Carrier Mediated Ocular Delivery of Triamcinolone Acetonide: A Preclinical Investigation in the Management of Uveitis

The current study was undertaken to evaluate the efficacy of a novel nano-lipoidal eye drop formulation of triamcinolone acetonide (TA) for the topical treatment of uveitis. The triamcinolone acetonide-loaded nanostructured lipid carriers (cTA-NLC) were developed by employing 'hot microemulsion method' using biocompatible lipids, which exhibited a sustained release nature and enhanced efficacy when evaluated in vitro. The in vivo efficacy of this developed formulation was tested on Wistar rats, and a single-dose pharmacokinetic study was conducted in rabbits. The eyes of animals were examined for any signs of inflammation using the 'Slit-lamp microscopic' method. The aqueous humor collected from the sacrificed rats was tested for total protein count and cell count. The total protein count was determined using BSA assay method, while the total cell count was determined by Neubaur's hemocytometer method. The results showed that the cTA-NLC formulation had negligible signs of inflammation, with a clinical score of uveitis 0.82 +/- 0.166, which is much less than control/untreated (3.80 +/- 0.3) and free drug suspension (2.66 +/- 0.405). The total cell count was also found to be significantly low for cTA-NLC (8.73 +/- 1.79 x 10(5)) as compared to control (52.4 +/- 7.71 x 10(5)) and free drug suspension (30.13 +/- 3.021 x 10(5)). Conclusively, the animal studies conducted showed that our developed formulation holds the potential for effective management of uveitis.