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Trans-scleral diffusion of triamcinolone acetonide
Paolo Mora1, Simone Eperon, Olivia Felt-Baeyens
1Jules Gonin Eye Hospital, University of Lausanne, Ocular Immunology, Lausanne, Switzerland.
Current Eye Research
|July 16, 2005
Summary
Triamcinolone acetonide (TA) effectively crosses human sclera, with permeability comparable to other corticosteroids. This indicates potential for scleral drug delivery applications.
Area of Science:
- Ophthalmology
- Pharmacology
- Materials Science
Background:
- Corticosteroids are used to treat ocular inflammation.
- Understanding drug penetration through the sclera is crucial for developing effective ocular therapies.
- Triamcinolone acetonide (TA) is a potent corticosteroid with potential for intraocular use.
Purpose of the Study:
- To determine the ex vivo permeability of human sclera to triamcinolone acetonide (TA).
- To quantify the rate and extent of TA diffusion through the scleral tissue.
Main Methods:
- Human scleral samples were mounted in a Franz-type vertical diffusion cell.
- A TA suspension was placed in the donor chamber, and concentrations were measured over time using HPLC.
- Permeability coefficient was calculated based on diffusion rates.
Main Results:
- TA demonstrated significant diffusion across the human sclera.
- Diffusion reached 72% after 4 days, with equilibrium achieved thereafter.
- The human scleral permeability coefficient for TA was determined to be 1.47 x 10(-5) cm/s.
Conclusions:
- Triamcinolone acetonide (TA) effectively penetrates human scleral tissue.
- Drug retention in the sclera increased over time, requiring 4 days for flux equilibration.
- The scleral permeability of TA is comparable to that of other corticosteroid agents.
