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Endothelin-1 effects on aqueous humor dynamics in monkeys
J C Millar1, B T Gabelt, W C Hubbard
1Department of Ophthalmology & Visual Sciences, University of Wisconsin-Madison 53792-3220, USA.
Acta Ophthalmologica Scandinavica
|January 9, 1999
Summary
Endothelin-1 did not affect aqueous humor formation or outflow facility in cynomolgus monkeys. These findings contrast with previous studies in rabbits and other monkeys, suggesting species-specific responses.
Area of Science:
- Ophthalmology
- Pharmacology
- Physiology
Background:
- Endothelin-1 is a potent vasoconstrictor with known effects on ocular hemodynamics.
- Previous research indicated endothelin-1 influences aqueous humor dynamics, but findings vary across species.
Purpose of the Study:
- To investigate the effect of endothelin-1 on aqueous humor formation and outflow facility in cynomolgus monkeys.
- To compare these findings with previously reported effects in rabbits and other primate models.
Main Methods:
- Intracameral or intravitreal administration of endothelin-1 in cynomolgus monkeys.
- Measurement of total outflow facility using constant pressure perfusion.
- Measurement of aqueous humor flow using scanning fluorophotometry.
Main Results:
- Endothelin-1 administration did not alter total outflow facility.
- Endothelin-1 did not affect aqueous humor flow.
- No significant changes were observed with varying concentrations or administration routes.
Conclusions:
- Endothelin-1 does not appear to influence aqueous humor dynamics in cynomolgus monkeys.
- The effects of endothelin-1 on ocular physiology may be species-dependent.
- Further research is needed to elucidate the variable roles of endothelin-1 in different species.