Structure-activity relationship (SAR) between some natural flavonoids and ocular blood flow in the rabbit.
OBJECTIVE
Flavonoids with two to five hydroxy groups, with or without sugar, and/or methoxy groups were studied on their effects to affect ocular blood flow.


METHODS
Colored microsphere technique was used to determine the ocular blood flow in rabbit eyes.


RESULTS
Flavonoids with three free hydroxy (OH) groups seemed to produce the optimal effects in increasing ocular blood flow (naringenin and hesperitin, Pfalts and Bauer, Waterbury, CT). Whether the OH groups are below three (naringenin, hesperitin, Pfalts and Bauer, Waterbury, CT) or above four (Quercetin, Pfalts and Bauer, Waterbury, CT), they produced no effects on the ocular blood flow. When OH groups are four (rutin, Aldrich, Milwaukee, WI), it produced mixed effects on ocular blood flow. The attachment of rutinose and/or methoxy group in the structure did not affect the ocular blood flow one way or the other.


CONCLUSIONS
The ocular blood flow is increased significantly by the number of OH group in the molecule, with three the best to increase the ocular blood flow.
Park
Young-Hyun
YH
Soonchunhyang University, Korea.
Chiou
George C Y
GC
D000818:Animals; D004195:Disease Models, Animal; D005123:Eye / Q000098:blood supply* / Q000187:drug effects; D005260:Female; D005419:Flavonoids / Q000737:chemistry* / Q000494:pharmacology*; D007322:Instillation, Drug; D008297:Male; D009798:Ocular Hypertension / Q000503:physiopathology*; D011817:Rabbits; D012039:Regional Blood Flow / Q000187:drug effects / Q000502:physiology; D013329:Structure-Activity Relationship
D005419:Flavonoids