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Altamirano-Vallejo JC, Navarro-Partida J, Gonzalez-De la Rosa A, Hsiao JH, Olguín-Gutierrez JS, Gonzalez-Villegas AC, Keller BC, Bouzo-Lopez L, Santos A. Characterization and Pharmacokinetics of Triamcinolone Acetonide-Loaded Liposomes Topical Formulations for Vitreoretinal Drug Delivery. J Ocul Pharmacol Ther 2018; 34:416-425. [PMID: 29584529 DOI: 10.1089/jop.2017.0099] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
PURPOSE To achieve a safer alternative to intravitreal injection of corticosteroids, we developed and characterized triamcinolone acetonide-loaded liposomes formulations (TA-LFs) to be used topically for vitreoretinal drug delivery. METHODS Four different 0.2% TA-LFs (TA-LF1 to TA-LF4) were generated and submitted to physicochemical characterization. Posteriorly, an ex vivo diffusion assay was performed using rabbit corneas as membranes. Finally, concentrations of triamcinolone acetonide (TA) were determined by high-performance liquid chromatography in ocular tissues from New Zealand white rabbits after multiple topical doses of TA-LF2 (6 times per day, 14 days). In addition, toxicity and tolerability of TA-LF2 was evaluated by cell viability assay and eye examination of study animals, respectively. RESULTS TA-LF2 was the most stable formulation maintaining a stable hidrogenion potential (pH) at 30 and 40°C and even improving encapsulation with higher temperature. TA-LF2 and TA-LF3 presented the best diffusion performance in vitro reaching the highest TA concentrations after 8 h of follow-up. In vivo diffusion and pharmacokinetics analysis showed that concentrations of TA in retina and vitreous reached the highest peak at 12 h after topical administration of TA-LF2 (252.10 ± 90.00 ng/g and 32.6 ± 10.27 ng/g, respectively) and subsequently decline to 24.0 ± 11.72 ng/g and 19.5 ± 13.14 ng/g, respectively, at 14 days of follow-up. Finally, cell viability was unaffected by TA-LF2, and no increase in intraocular pressure nor ocular alterations were observed after topical administration of this formulation in rabbits. CONCLUSION TA-loaded liposomes, administered topically, can deliver TA in the vitreous cavity and reach the retina efficiently.
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Affiliation(s)
- Juan C Altamirano-Vallejo
- 1 Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud , Campus Guadalajara, Zapopan, México.,2 Centro de Retina Medica y Quirurgica , S.C., Centro Medico Puerta de Hierro, Zapopan, México
| | - Jose Navarro-Partida
- 1 Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud , Campus Guadalajara, Zapopan, México.,2 Centro de Retina Medica y Quirurgica , S.C., Centro Medico Puerta de Hierro, Zapopan, México
| | - Alejandro Gonzalez-De la Rosa
- 1 Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud , Campus Guadalajara, Zapopan, México.,2 Centro de Retina Medica y Quirurgica , S.C., Centro Medico Puerta de Hierro, Zapopan, México
| | | | | | | | | | | | - Arturo Santos
- 1 Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud , Campus Guadalajara, Zapopan, México.,2 Centro de Retina Medica y Quirurgica , S.C., Centro Medico Puerta de Hierro, Zapopan, México
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