The effect of topical CS-088, an angiotensin AT1 receptor antagonist, on intraocular pressure and aqueous humor dynamics in rabbits.

Abstract

PURPOSE:

To evaluate the ocular hypotensive effect of topical CS-088, an angiotensin AT1 receptor antagonist, and the effect of CS-088 on aqueous humor dynamics.

METHODS:

The effects of CS-088 on intraocular pressure (IOP) were studied in 2 models of rabbit ocular hypertension. Experimental ocular hypertension was induced in albino rabbits by injecting alpha-chymotrypsin into the anterior chamber (alpha-chymotrypsin rabbit). The effects of the single application of CS-088 were examined. Additionally, CS-088 was repeatedly administered over a period of 3 weeks to hereditary ocular hypertensive rabbits (buphthalmic rabbits, JWHR bu/bu) and the IOPs were monitored throughout the experiment. The effects of CS-088 on aqueous humor dynamics were also examined in normal rabbits. In this study, the methods of IOP recovery rate, two-level constant pressure perfusion and fluorescein-dextran perfusion were used respectively to determine the aqueous inflow, outflow facility and uveoscleral outflow (USF).

RESULTS:

CS-088 at 1% and 2% significantly lowered the IOP in the alpha-chymotrypsin rabbits with a maximum IOP reduction of 10.1 mmHg. The maximum effect obtained with 2% CS-088 was no greater than that with 1% CS-088. In the buphthalmic rabbits, 2% CS-088 also lowered IOP significantly. Timolol was effective in both models. In the study on aqueous humor dynamics, a slight increase in USF (17%) was seen after a topical application of CS-088 whereas changes in aqueous inflow or outflow facility were not observed.

CONCLUSIONS:

Topical CS-088 can decrease IOP in rabbits. Despite the USF change, the ocular hypotensive mechanism by CS-088 was not fully determined.

• Authors: T Inoue, T Yokoyoma, Y Mori, Y Sasaki, T Hosokawa, H Yanagisawa, H Koike
• Journal: Current eye research (Curr Eye Res) Vol. 23 Issue 2 Pg. 133-8 (Aug 2001) ISSN: 0271-3683 [Print] England
• PMID: 11840352 (Publication Type: Journal Article)

Chemical References

• Adrenergic beta-Antagonists
• Angiotensin Receptor Antagonists
• Imidazoles
• Ophthalmic Solutions
• Receptor, Angiotensin, Type 1
• Tetrazoles
• Timolol
• olmesartan
• Chymotrypsin
• alpha-chymotrypsin

Topics

• Administration, Topical
• Adrenergic beta-Antagonists (administration & dosage, pharmacology)
• Angiotensin Receptor Antagonists
• Animals
• Aqueous Humor (metabolism)
• Chymotrypsin
• Disease Models, Animal
• Imidazoles (administration & dosage, pharmacology)
• Intraocular Pressure (drug effects)
• Male
• Ocular Hypertension (drug therapy, metabolism)
• Ophthalmic Solutions
• Rabbits
• Receptor, Angiotensin, Type 1
• Tetrazoles (administration & dosage, pharmacology)
• Timolol (administration & dosage, pharmacology)