Related Experiment Videos
PGF2 alpha/pilocarpine interactions on IOP and accommodation in monkeys
1Department of Ophthalmology & Visual Sciences, University of Wisconsin-Madison 53792-3220, USA.
Experimental Eye Research
|December 1, 1995
Summary
Topical prostaglandin F2 alpha (PGF2 alpha) eye drops reduce intraocular pressure but do not affect accommodation response to pilocarpine in monkeys. Pilocarpine
Area of Science:
- Ophthalmology
- Pharmacology
- Neuroscience
Background:
- Prostaglandin F2 alpha (PGF2 alpha) analogs are widely used to treat glaucoma by lowering intraocular pressure (IOP).
- The effects of PGF2 alpha on the eye's accommodative response, particularly in conjunction with miotics like pilocarpine, require further elucidation.
- Understanding these interactions is crucial for optimizing glaucoma treatment and managing potential side effects.
Purpose of the Study:
- To investigate the impact of topical prostaglandin F2 alpha tromethamine salt (PGF2 alpha-TS) and isopropyl ester (PGF2 alpha-IE) on the accommodative response to pilocarpine.
- To determine if pilocarpine administration affects the ocular hypotensive effect of PGF2 alpha when given in a different sequence.
- To assess the effects of single and repeated topical PGF2 alpha administration on IOP and accommodation in cynomolgus monkeys.
Main Methods:
- Cynomolgus monkeys received twice-daily topical applications of PGF2 alpha-IE or PGF2 alpha-TS for 4 days.
- Intraocular pressure (IOP) and refraction were measured before and after dosing.
- Pilocarpine was administered topically or systemically after PGF2 alpha treatment, with subsequent IOP and refraction measurements.
Main Results:
- Repeated topical PGF2 alpha (both forms) significantly reduced ipsilateral IOP by approximately 10 mmHg.
- Neither single nor repeated PGF2 alpha treatment affected the accommodative response to pilocarpine in either the ipsilateral or contralateral eye.
- Pilocarpine reversed the PGF2 alpha-induced IOP reduction when administered before PGF2 alpha, but not when given after.
Conclusions:
- Topical PGF2 alpha (tromethamine salt or isopropyl ester) effectively lowers IOP in cynomolgus monkeys without impairing accommodation.
- The sequence of administration is critical: pilocarpine can counteract PGF2 alpha's hypotensive effect if given beforehand.
- These findings suggest PGF2 alpha's utility in glaucoma management without compromising the eye's focusing ability.