| Involvement of cannabinoid receptors in the intraocular pressure-lowering effects of WIN55212-2. | |
| | |
MedLine Citation:
|
PMID: 10604940 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
It is known that marijuana smoking and administration of natural cannabinoids reduce intraocular pressure. However, it has not been established whether the intraocular pressure-lowering effects of cannabinoids are mediated by cannabinoid receptors. Aminoalkylindoles are a new class of cannabimimetics with structures entirely different from those of natural cannabinoids. WIN55212-2, a prototypic aminoalkylindole, has been shown to bind cannabinoid receptors and to exhibit cannabinoid-like activities. The objective of this study was to determine whether aminoalkylindoles lower intraocular pressure and whether the effects of aminoalkylindoles are mediated by ocular cannabinoid receptors. The intraocular pressure of New Zealand White rabbits was measured with the use of applanation pneumatonography. After the measurement of baseline intraocular pressure, drugs were applied topically and the intraocular pressure was monitored. The topical application of WIN55212-2 significantly reduced intraocular pressure in the treated eyes. The intraocular pressure-lowering effects of WIN55212-2 were time and dose dependent, and the maximal reduction was 4.7 +/- 0.5 mm Hg at a dose of 100 microg. In contrast to treated eyes, the intraocular pressure on the contralateral eyes was not significantly affected. The topical application of WIN55212-3, the enantiomer of WIN55212-2, had no effect on intraocular pressure. Furthermore, the intraocular pressure-lowering effects of WIN55212-2 were significantly reduced by topically administered SR141716A, a selective antagonist for the CB1 cannabinoid receptor. The dose-response curve of WIN55212-2 is shifted parallel to the right by SR141716A. These data demonstrate that like natural cannabinoids, WIN55212-2 also reduces intraocular pressure, and the effects of WIN55212-2 are mediated at least in part by the CB1 cannabinoid receptors in the eye. |
| | |
Authors:
|
Z H Song; C A Slowey |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
|
Title: The Journal of pharmacology and experimental therapeutics Volume: 292 ISSN: 0022-3565 ISO Abbreviation: J. Pharmacol. Exp. Ther. Publication Date: 2000 Jan |
Date Detail:
|
Created Date: 2000-01-27 Completed Date: 2000-01-27 Revised Date: 2007-11-15 |
Medline Journal Info:
|
Nlm Unique ID: 0376362 Medline TA: J Pharmacol Exp Ther Country: UNITED STATES |
Other Details:
|
Languages: eng Pagination: 136-9 Citation Subset: IM |
Affiliation:
|
Department of Pharmacology and Toxicology, University of Louisville School of Medicine, Louisville, KY 40292, USA. zhsong@louisville.edu |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Administration, Topical Analgesics / pharmacology* Animals Benzoxazines Dose-Response Relationship, Drug Drug Interactions Female Intraocular Pressure / drug effects* Male Morpholines / pharmacology* Naphthalenes / pharmacology* Piperidines / pharmacology Pyrazoles / pharmacology Rabbits Receptors, Cannabinoid Receptors, Drug / antagonists & inhibitors, drug effects, physiology* Stereoisomerism Time Factors Tonometry, Ocular |
| Chemical | |
Reg. No./Substance:
|
0/Analgesics; 0/Benzoxazines; 0/Morpholines; 0/Naphthalenes; 0/Piperidines; 0/Pyrazoles; 0/Receptors, Cannabinoid; 0/Receptors, Drug; 134959-51-6/Win 55212-2; 158681-13-1/rimonabant |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: MCC-134, a novel vascular relaxing agent, is an inverse agonist for the pancreatic-type ATP-sensitiv...
Next Document: Metabolism of antisense oligonucleotides in rat liver homogenates.