Document Detail


Hepatic and extra-hepatic stimulation of glutathione release into plasma by norepinephrine in vivo.
MedLine Citation:
PMID:  11092338     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Studies were conducted to determine the effect of norepinephrine (NE) on reduced glutathione (GSH) and oxidized glutathione (GSSG) export from hepatic and extra-hepatic tissues in vivo. Anesthetized Single Comb White Leghorn (SCWL) males were implanted with cannulae in the carotid artery, hepatic vein (HV) and hepatic portal veins (PV), and the left bile duct. In Experiment 1, GSH and GSSG in hepatic and portal venous plasma and bile were determined prior to, during, and following two 20-min infusions of NE (2 and 10 microg/min per kg BW) into the hepatic PV. The lower NE infusion rate increased hepatic venous GSH (indicative of increased GSH export into liver sinusoids) without affecting systemic or hepatic vascular pressures; however, it had no affect on portal venous GSH. The higher NE infusion rate increased GSH in the HV and hepatic PV (indicative of extra hepatic export of glutathione) as well as systemic pressure, hepatic and portal venous pressures, and the transhepatic pressure gradient. Biliary secretion of GSH and GSSG was unaffected by either rate of NE infusion in Experiment 1. In Experiment 2, pretreatment of birds with phentolamine, an alpha-adrenergic receptor blocker (alpha-block), abolished sinusoidal export GSH as well as the ability of NE to stimulate GSH release from hepatic and extra-hepatic tissue. Although HV and PV pressures were lower in alpha-block birds compared with controls, there were no differences in the transhepatic pressure gradient between groups. Plasma GSSG was below the limits of detection in Experiments 1 and 2. The combined results of Experiments 1 and 2 indicate that hepatic export of GSH was independent of changes in systemic or hepatic vascular pressures or changes in the transhepatic pressure gradient. The results of these studies are the first to demonstrate that export of GSH into plasma in vivo is mediated by an alpha-receptor-mediated mechanism in hepatic and extra-hepatic tissues. The findings may be particularly important with regard to antioxidant homeostasis of animals during periods of stress.
Authors:
Z Song; D Cawthon; K Beers; W G Bottje
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Poultry science     Volume:  79     ISSN:  0032-5791     ISO Abbreviation:  Poult. Sci.     Publication Date:  2000 Nov 
Date Detail:
Created Date:  2001-03-08     Completed Date:  2001-05-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0401150     Medline TA:  Poult Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1632-9     Citation Subset:  IM    
Affiliation:
Department of Poultry Science, University of Arkansas, Fayetteville 72701, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Bile / metabolism
Blood Pressure / drug effects
Carotid Arteries
Chickens
Glutathione / blood,  metabolism*
Glutathione Disulfide / blood,  metabolism*
Heart Rate / drug effects
Infusions, Intravenous
Kinetics
Liver / drug effects,  metabolism*
Male
Norepinephrine / administration & dosage,  pharmacology*
Organ Specificity
Phentolamine / pharmacology
Portal Vein
Receptors, Adrenergic, alpha / physiology
Chemical
Reg. No./Substance:
0/Receptors, Adrenergic, alpha; 27025-41-8/Glutathione Disulfide; 50-60-2/Phentolamine; 51-41-2/Norepinephrine; 70-18-8/Glutathione

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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