TY - JOUR
T1 - Effects of a prostaglandin DP receptor agonist, AL-6598, on aqueous humor dynamics in a nonhuman primate model of glaucoma
AU - Toris, Carol B.
AU - Zhan, Gui Lin
AU - Feilmeier, Michael R.
AU - Camras, Carl B.
AU - McLaughlin, Marsha A.
PY - 2006/4
Y1 - 2006/4
N2 - This study examines, in 11 cynomolgus monkeys with unilateral laser-induced glaucoma, the ocular hypotensive mechanism of action of AL-6598, partial agonist at the DP and EP prostanoid receptors. In a crossover fashion, both eyes of each monkey were dosed twice-daily with 25 μL of either AL-6598 0.01% or vehicle for 2 days and on the morning of the 3rd day. Measurements were made on day 3 of each treatment. Alternative treatments were separated by at least 2 weeks. Intraocular pressures (IOPs) were measured by pneumatonometry and aqueous flow and outflow facility by fluorophotometry. Uveoscleral outflow was calculated mathematically. In the normotensive eyes, compared to vehicle treatment, AL-6598 decreased IOP from 22.5 ± 0.7 to 18.7 ± 0.9 mmHg (P = 0.006), increased uveoscleral outflow from 0.47 ± 0.17 to 1.22 ± 0.17 μL/min (P = 0.03), and increased aqueous flow from 1.49 ± 0.10 to 1.93 ± 0.13 μL/min (P = 0.01). No measurement in AL-6598-treated hypertensive eyes was significantly different from vehicle treatment. It is concluded that AL-6598 reduces IOP by increasing uveoscleral outflow in normotensive eyes of ketamine-sedated monkeys, despite an increase in aqueous flow. This effect is different from that of PGD2, which decreases aqueous flow, and of the selective DP receptor agonist, BW245C, which increases both outflow facility and uveoscleral outflow in addition to decreasing aqueous flow.
AB - This study examines, in 11 cynomolgus monkeys with unilateral laser-induced glaucoma, the ocular hypotensive mechanism of action of AL-6598, partial agonist at the DP and EP prostanoid receptors. In a crossover fashion, both eyes of each monkey were dosed twice-daily with 25 μL of either AL-6598 0.01% or vehicle for 2 days and on the morning of the 3rd day. Measurements were made on day 3 of each treatment. Alternative treatments were separated by at least 2 weeks. Intraocular pressures (IOPs) were measured by pneumatonometry and aqueous flow and outflow facility by fluorophotometry. Uveoscleral outflow was calculated mathematically. In the normotensive eyes, compared to vehicle treatment, AL-6598 decreased IOP from 22.5 ± 0.7 to 18.7 ± 0.9 mmHg (P = 0.006), increased uveoscleral outflow from 0.47 ± 0.17 to 1.22 ± 0.17 μL/min (P = 0.03), and increased aqueous flow from 1.49 ± 0.10 to 1.93 ± 0.13 μL/min (P = 0.01). No measurement in AL-6598-treated hypertensive eyes was significantly different from vehicle treatment. It is concluded that AL-6598 reduces IOP by increasing uveoscleral outflow in normotensive eyes of ketamine-sedated monkeys, despite an increase in aqueous flow. This effect is different from that of PGD2, which decreases aqueous flow, and of the selective DP receptor agonist, BW245C, which increases both outflow facility and uveoscleral outflow in addition to decreasing aqueous flow.
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U2 - 10.1089/jop.2006.22.86
DO - 10.1089/jop.2006.22.86
M3 - Article
C2 - 16722794
AN - SCOPUS:33646687247
SN - 1080-7683
VL - 22
SP - 86
EP - 92
JO - Journal of Ocular Pharmacology and Therapeutics
JF - Journal of Ocular Pharmacology and Therapeutics
IS - 2
ER -