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Curr Eye Res. 2010 Aug;35(8):742-50. doi: 10.3109/02713683.2010.486519.

Intraocular properties of a repository urokinase receptor antagonist a36 Peptide in rabbits.

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  • 1Joan and Irwin Jacobs Retina Center, Department of Ophthalmology, Shiley Eye Center, University of California, La Jolla, California, USA.

Abstract

PURPOSE:

To evaluate the intraocular properties of A36, a peptide that directly antagonizes the cell surface urokinase receptor and so prevents pericellular urokinase plasminogen activator activity.

METHODS:

A total of 41 rabbits were used. The toxicity study tested three doses of A36: 1 mg/ eye, 0.3 mg/eye, and 0.1 mg/eye. At 2 and 12 weeks, eyes were evaluated by ERG and histology. Pharmacokinetics were studied in rabbit eyes with the dose of 1 mg/eye in two different formulations: a micronized preparation and a non-micronized formulation. Eyes were enucleated at months 1, 2, 3, 4, and 5. Vitreous, retina, and choroid were collected separately for active A36 analysis.

RESULTS:

We did not find ocular toxicity with low and medium doses. At the highest dose, there was a transient toxicity at 2 weeks but was not notable at 3 months. The target choroid concentration of A36 was chosen as > or =100 nM. The micronized formulation at months 1, 2, and 3 combined, showed variable levels in the choroid giving 5/10 (50%) of the therapeutic level; the non-micronized formulation at months 4 and 5 combined, gave 6/7 (86%) of the therapeutic level, although this difference was not statistically significant.

CONCLUSION:

A36 appears to be long lasting; the non-micronized formulation of A36 gave concentrations above therapeutic level in the choroid at months 4 and 5. Optimization of the formulation of A36, particularly the particle size, may result in a promising new compound for exudative age-related macular degeneration treatment.

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