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Bimatoprost effects on aqueous humor dynamics in monkeys
David F Woodward1, Achim H-P Krauss, Siv F E Nilsson
1Department of Biological Sciences, Allergan, Inc., Irvine, CA 92612, USA.
Journal of Ophthalmology
|May 29, 2010
Summary
Bimatoprost, a glaucoma medication, was found to increase uveoscleral outflow in monkey eyes. This study indicates bimatoprost lowers intraocular pressure exclusively through enhancing uveoscleral outflow.
Area of Science:
- Ophthalmology
- Pharmacology
Background:
- Glaucoma management often involves medications to reduce intraocular pressure (IOP).
- Understanding the precise mechanisms by which IOP-lowering drugs function is crucial for optimizing treatment strategies.
Purpose of the Study:
- To investigate the specific effects of bimatoprost on the dynamics of aqueous humor in non-human primate eyes.
- To determine whether bimatoprost influences uveoscleral outflow, total outflow facility, or aqueous humor flow.
Main Methods:
- Uveoscleral outflow was measured using the anterior chamber perfusion method with FITC-dextran.
- Total outflow facility was assessed via the two-level constant pressure method.
- Aqueous humor flow was quantified using a scanning ocular fluorophotometer.
Main Results:
- Bimatoprost (0.01% b.i.d. for 5 days) significantly increased uveoscleral outflow compared to vehicle control (1.37 +/- 0.27 muL/min vs. 0.96 +/- 0.19 muL/min, P < .05).
- Bimatoprost did not alter total outflow facility (0.42 +/- 0.05 muL/min at baseline vs. 0.42 +/- 0.04 muL/min post-treatment).
- No significant effect of bimatoprost on aqueous humor flow was observed.
Conclusions:
- Bimatoprost effectively enhances uveoscleral outflow in ocular normotensive monkeys.
- The IOP-lowering effect of bimatoprost in this model is primarily mediated by an increase in uveoscleral outflow.
- Bimatoprost does not appear to affect total outflow facility or aqueous humor production, suggesting a targeted mechanism of action.
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