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NCX 125, a compound targeting 2 different mechanisms, is endowed with potent ocular hypotensive effects. This may lead to potential new perspectives in the treatment of patients at risk of glaucoma.

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PURPOSE. The prostaglandin F2alpha (PGF2a) analogue bimatoprost lowers intraocular pressure (IOP) by increasing uveoscleral outflow at doses shown to elicit redness of the eye. With the aim to enhance the IOP-lowering effect of bimatoprost we studied NCX 470, a dual-acting compound combining bimatoprost with nitric oxide (NO) known to mainly act via relaxation of trabecular meshwork and Schlemm's canal.METHODS. New Zealand white rabbits with transient hypertonic saline-induced IOP elevation (tOHT-rabbits), cynomolgus monkeys with laser-induced ocular hypertension (OHT-monkeys), and normotensive dogs (ONT-dogs) were used. The levels of NCX 470, bimatoprost, and bimatoprost acid were determined in aqueous humor (AH), cornea (CR), and iris/ciliary body (ICB) by liquid chromatography-mass spectrometry/mass (LC-MS/MS), while cGMP in AH and ICB was monitored using an enzyme immunoassay (EIA) kit in pigmented Dutch Belted rabbits.RESULTS. NCX 470 (0.14%, 30 lL) lowered IOP in tOHT-rabbits with an E max of À7.2 6 2.8 mm Hg at 90 minutes. Bimatoprost at equimolar dose (0.1%, 30 lL) was noneffective in this model. NCX 470 (0.042%, 30 lL) was more effective than equimolar (0.03%, 30 lL) bimatoprost in ONT-dogs (IOP change, À5.4 6 0.7 and À3.4 6 0.7 mm Hg, respectively, P < 0.05) and in OHT-monkeys (IOP change, À7.7 6 1.4 and À4.8 6 1.7 mm Hg, respectively, P < 0.05) at 18 hours post dosing. NCX 470 (0.042%, 30 lL) or bimatoprost (0.03%, 30 lL) resulted in similar bimatoprost acid exposure in AH, CR, and ICB while cGMP was significantly increased in AH and ICB at 18 and 24 hours after NCX 470 dosing.CONCLUSIONS. NCX 470 lowers IOP more than equimolar bimatoprost in three animal models of glaucoma by activating PGF2a and NO/cGMP signaling pathways.

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