Morphine-stimulated nitric oxide release in rabbit aqueous humor.

Morphine-stimulated nitric oxide release in rabbit aqueous humor. Research Abstract Details 

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Morphine-stimulated nitric oxide release in rabbit aqueous humor. Abstract Text:

Juanita Dortch-Carnes,Karen Russell,

Recent studies in our laboratory have demonstrated a role of nitric oxide (NO) in morphine-induced reduction of intraocular pressure (IOP) and pupil diameter (PD) in the New Zealand white (NZW) rabbit. The present study was designed to determine the effect of morphine on NO release in the aqueous humor of NZW rabbits, as this effect could be associated with morphine-mediated changes in aqueous humor dynamics and iris function. Dark-adapted NZW rabbits were treated as follows: (1) treatment with morphine (10, 33 or 100 microg, 5 min); (2) treatment with morphine or endomorphin-1 for 5, 15 or 30 min; (3) pretreatment with naloxone (100 microg), L-NAME (125 microg) or reduced glutathione (GSH, 100 microg) for 30 min, followed by treatment with morphine (100 microg, 5 min). After the various treatment regimens, aqueous humor samples were obtained by paracenthesis and immediately assayed for nitrates and nitrites (an index of NO production), using a microplate assay kit. Morphine caused a dose-dependent increase in the levels of NO in aqueous humor after 5 min of treatment with each dose. Rabbits treated with endomorphin-1 (100 microg) had no significant change in NO levels in aqueous at any point in the course of time. Aqueous samples from rabbits treated with morphine (100 microg) for 5 min increased from 29.84+/-2.39 microM (control) to 183.94+/-23.48 microM (treated). The increase in NO levels by morphine (100 microg, 5 min) was completely inhibited in the presence of naloxone (100 microg), L-NAME (125 microg) or GSH (100 microg). These results indicate that morphine-induced increase in NO production in aqueous humor is a transient response that is linked to the activation of mu opioid receptors. Data obtained suggest that morphine-stimulated changes in ocular hydrodynamics and iris function are due, in part, to increased release of NO in aqueous humor. In addition, the sensitivity of the response to l-NAME and GSH suggests that morphine-induced release of nitric oxide into aqueous humor is mediated by activation of mu-3 opioid receptors found in the anterior segment of the eye.

Morphine-stimulated nitric oxide release in rabbit aqueous humor. Publishing Authors By Initials

J Dortch-Carnes,K Russell,

For similar animals: chordata: vertebrates: mammals: lagomorpha: rabbits research abstracts see: animals: chordata: vertebrates: mammals: lagomorpha: rabbits research

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MEDLINE DATE:

Morphine-stimulated nitric oxide release in rabbit aqueous humor. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Experimental eye research

VOLUME: 84

Page Numbers: 185-90

Journal Abbreviation: Exp. Eye Res.

ISSN: 0014-4835

DAY: 13

MONTH: 11

YEAR: 2006

Morphine-stimulated nitric oxide release in rabbit aqueous humor. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 370707

Morphine-stimulated nitric oxide release in rabbit aqueous humor. Keywords Mesh Terms:

KEYWORDS: Rabbits

MESH TERMS: pharmacology

Chemical & Substance for Abstract: Morphine-stimulated nitric oxide release in rabbit aqueous humor. Information

Substance Name: Glutathione

Registry Number: 70-18-8

Grant and Affiliation Information for Morphine-stimulated nitric oxide release in rabbit aqueous humor.

AFFILIATION: Department of pharmacology/Toxicology Morehouse School of Medicine, 720 Westview Drive, SW Atlanta, GA 30310-1495, USA. carnesj@msm.edu

Country: England

AGENCY: United States NEI

GRANT: R03 EY014346-03

ACRONYM: EY

MEDLINETA: Exp Eye Res

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