Endothelin-1 effects on aqueous humor dynamics in monkeys.
OBJECTIVE
To report data showing no effect of endothelin-1 on aqueous humor formation and total outflow facility in the cynomolgus monkey, in contrast to the enhancement of outflow facility in monkeys and the suppression of aqueous humor flow in rabbits previously reported by others.


METHODS
Living monkeys received, unilaterally: (i) intracameral endothelin-1 (10 microl bolus, or 2ml or 4ml exchange; final intracameral concentration 1 or 10 nM) with total outflow facility measured for up to 1 hr post-treatment by two-level constant pressure perfusion, and (ii) intravitreal endothelin-1 (20 microl, final intravitreal concentration 0.1 or 1 microM) with aqueous humor flow measured by scanning fluorophotometry for 5 hr starting 12 hr post-treatment. Contralateral eyes received vehicle.


RESULTS
Endothelin-1 had no effect on total outflow facility or aqueous humor flow with any of the methods described.


CONCLUSIONS
Endothelin-1 seems have a variable effect on aqueous humor dynamics within and between species.
Millar
J C
JC
Department of Ophthalmology & Visual Sciences, University of Wisconsin-Madison 53792-3220, USA.
Gabelt
B T
BT
Hubbard
W C
WC
Kiland
J A
JA
Kaufman
P L
PL
D000818:Animals; D000867:Anterior Chamber / Q000187:drug effects*; D001082:Aqueous Humor / Q000378:metabolism*; D019332:Endothelin-1 / Q000494:pharmacology*; D005260:Female; D019793:Fluorescein / Q000378:metabolism; D015590:Fluorophotometry; D008252:Macaca fascicularis; D008297:Male
D019332:Endothelin-1; D019793:Fluorescein