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Abstract #8983 Published in IGR 5-2

Pharmacological characterization of a novel antiglaucoma agent, Bimatoprost (AGN 192024)

Woodward DF; Krauss AH; Chen J; Liang Y; Li C; Protzman CE; Bogardus A; Chen R; Kedzie K; Krauss HA
Journal of Pharmacology and Experimental Therapeutics 2003; 305: 772-785


Replacement of the carboxylic acid group of prostaglandin (PG) F2ALP with a nonacidic moiety, such as hydroxyl, methoxy, or amido, results in compounds with unique pharmacology. Bimatoprost (AGN 192024) is also a pharmacologically novel PGF2ALP analogue, where the carboxylic acid is replaced by a neutral ethylamide substituent. Bimatoprost potently contracted the feline lung parenchymal preparation (EC50 value of 35-55 nm), but exhibited no meaningful activity in a variety of PG-sensitive tissue and cell preparations. Its activity seemed unrelated to FP receptor stimulation according to the following evidence: 1. Bimatoprost exhibited no meaningful activity in tissues and cells containing functional FP receptors. 2. Bimatoprost activity in the cat lung parenchyma is not species-specific because its potent activity in this preparation could not be reproduced in cells stably expressing the feline FP receptor. 3. Radioligand binding studies using feline and human recombinant FP receptors exhibited minimal competition versus (3H)17-phenyl PGF2a for bimatoprost. 4. Bimatoprost pretreatment did not attenuate PGF2ALP-induced Ca2+ signals in Swiss 3T3 cells. 5. Regional differences were apparent for bimatoprost but not FP agonist effects in the cat lung. Bimatoprost reduced intraocular pressure (IOP) in ocular normotensive and hypertensive monkeys over a 0.001-0.1% dose range. A single-dose and multiple-dose ocular distribution/metabolism studies using (3H)bimatoprost (0.1%) were performed. Within the globe, bimatoprost concentrations were ten to 100-fold higher in anterior segment tissues compared with the aqueous humor. Bimatoprost was overwhelmingly the predominant molecular species identified at all time points in ocular tissues, indicating that the intact molecule reduces IOP.

Dr. D.F. Woodward, Department of Biological Sciences, Allergan, Inc., 2525 Dupont Drive, Irvine, CA 92612, USA. woodward_david@allergan.com


Classification:

11.4 Prostaglandins (Part of: 11 Medical treatment)



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