Add time:08/26/2019         Source:sciencedirect.com

It has been shown that prostaglandin A2 (PGA2) is a more potent ocular hypotensive agent in cats than other PG free acids. We report here that significant IOP reduction can be achieved in normotensive cat eyes with the use of even lower doses of PGA2-1-isopropyl ester (PGA2-IE) than with PGA2, PGF2α-1-isopropyl ester (PGF2α-IE), or any other known ocular hypotensive agent. Furthermore, single applications of 0·5 μg of PGA2-IE maintain significant IOP reductions for at least 24 hr. This hypotensive effect is enhanced during the first 3–5 days of daily treatment. Significant IOP reductions were maintained for several months as long as PGA2-IE was applied daily or at least once every 48 hr. None of the cats manifested signs of discomfort in response to treatment with doses ranging from 0·10 to 1·25 μg of PGA2-IE. Moreover, the extent of anterior chamber flare was less than that typically observed after the topical application of hypotensive doses of PGE2, PGD2, PGF2α, or the esters or tromethamine salt of PGF2α. Although it is possible that the human eye would respond differently to PGs of the A type, the results of these studies suggests that PGA2-IE or other esters of derived PGs of the A type, and probably the B type, may offer significant therapeutic advantages over the PGF2α tromethamine salt and PGF2α-IE, which have been shown to exert significant hypotensive effects on normal and glaucomatous human eyes.

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