Abstract
Latanoprost, a new ocular hypotensive prostaglandin F 2α, analogue prodrug, was found to induce increased pigmentation of monkey irides in chronic toxicity studies. This prompted us to investigate the effect of naturally occurring prostaglandins on the monkey iris to determine whether this pigmentary erect is unique for latanoprost or whether it is a class effect of prostaglandins. PGF 2α -isopropyl ester (IE), PGE 2α-IE and latanoprost were applied topically to cynomolgus monkey eyes tbr 18-44 weeks. One eye of each animal was treated, while the other served as control. In addition, latanoprost was applied to sympathectomized monkey eyes. PGF 2α, -IE, PGE 2α-IE, as well as latanoprost, induced increased pigmentation in the monkey eye. The first signs of this effect were seen after about two months of treatment. Latanoprost also induced increased pigmentation in sympathectomized eyes. It is concluded that both naturally occurring prostaglandins and their synthetic analogues can induce increased iridial pigmentation in cynomolgus monkeys, and that the effect does not require the presence of sympathetic nerves.
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