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1 General aspects (0)   1.1 Epidemiology (6)   1.2 Population genetics (0)   1.3 Pathogenesis (0)   1.4 Quality of life (12)   1.5 Glaucomas as cause of blindness (6)   1.6 Prevention and screening (15) 2 Anatomical structures in glaucoma (0)   2.1 Conjunctiva (3)   2.2 Cornea (18)   2.3 Sclera (3)   2.4 Anterior chamber angle (4)   2.5 Meshwork (0)     2.5.1 Trabecular meshwork (9)     2.5.2 Schlemms canal (2)     2.5.3 Scleral outlet channels (0)   2.6 Aqueous humor dynamics (1)     2.6.1 Production (0)     2.6.2 Outflow (0)       2.6.2.1 Trabecular meshwork (1)       2.6.2.2 Uveoscleral (0)     2.6.3 Compostion (5)   2.7 Episcleral veins and venous pressure (0)   2.8 Iris (6)   2.9 Ciliary body (0)   2.10 Lens (1)   2.11 Vitreous body (0)   2.12 Choroid, peripapillary choroid, peripapillary atrophy (1)   2.13 Retina and retinal nerve fibre layer (26)   2.14 Optic disc (21)   2.15 Optic nerve (2)   2.16 Chiasma and retrochiasmal central nervous system (4)   2.17 Stem cells (3)   2.20 Other (0) 3 Laboratory methods (0)   3.1 Microscopy (0)   3.2 Electron microscopy (0)   3.3 Immunohistochemistry (0)   3.4 Molecular genetics (0)     3.4.1 Linkage studies (0)     3.4.2 Gene studies (20)   3.5 Molecular biology incl. 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pharmacoeconomics (3) 15 Miscellaneous (47)

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Abstract #94855 Published in IGR 22-2

Distribution of Gold Nanoparticles in the Anterior Chamber of the Eye after Intracameral Injection for Glaucoma Therapy

Sonntag T; Froemel F; Stamer WD; Ohlmann A; Fuchshofer R; Breunig M
Pharmaceutics 2021; 13:

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In glaucoma therapy, nanoparticles (NPs) are a favorable tool for delivering drugs to the outflow tissues of the anterior chamber of the eye where disease development and progression take place. In this context, a prerequisite is an efficient enrichment of NPs in the trabecular meshwork with minimal accumulation in off-target tissues such as the cornea, lens, iris and ciliary body. We evaluated the optimal size for targeting the trabecular meshwork by using gold NPs of 5, 60, 80 and 120 nm with a bare surface (AuNPs) or coated with hyaluronic acid (HA-AuNPs). NPs were compared regarding their colloidal stability, distribution in the anterior chamber of the eye ex vivo and cellular uptake in vitro. HA-AuNPs demonstrated an exceptional colloidal stability. Even after application into porcine eyes ex vivo, the HA coating prevented an aggregation of NPs inside the trabecular meshwork. NPs with a diameter of 120 nm exhibited the highest volume-based accumulation in the trabecular meshwork. Off-target tissues in the anterior chamber demonstrated an exceptionally low gold content. Our findings are particularly important for NPs with encapsulated anti-glaucoma drugs because a higher particle volume would be accompanied by a higher drug payload.

Department of Pharmaceutical Technology, University of Regensburg, Universitaetsstrasse 31, 93040 Regensburg, Germany.

Full article

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Classification:

11.16 Vehicles, delivery systems, pharmacokinetics, formulation (Part of: 11 Medical treatment)

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