Document Detail


Melatonin differentially affects vascular blood flow in humans.
MedLine Citation:
PMID:  21148765     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Melatonin is synthesized and released into the circulation by the pineal gland in a circadian rhythm. Melatonin has been demonstrated to differentially alter blood flow to assorted vascular beds by the activation of different melatonin receptors in animal models. The purpose of the present study was to determine the effect of melatonin on blood flow to various vascular beds in humans. Renal (Doppler ultrasound), forearm (venous occlusion plethysmography), and cerebral blood flow (transcranial Doppler), arterial blood pressure, and heart rate were measured in 10 healthy subjects (29±1 yr; 5 men and 5 women) in the supine position for 3 min. The protocol began 45 min after the ingestion of either melatonin (3 mg) or placebo (sucrose). Subjects returned at least 2 days later at the same time of day to repeat the trial after ingesting the other substance. Melatonin did not alter heart rate and mean arterial pressure. Renal blood flow velocity (RBFV) and renal vascular conductance (RVC) were lower during the melatonin trial compared with placebo (RBFV, 40.5±2.9 vs. 45.4±1.5 cm/s; and RVC, 0.47±0.02 vs. 0.54±0.01 cm·s(-1)·mmHg(-1), respectively). In contrast, forearm blood flow (FBF) and forearm vascular conductance (FVC) were greater with melatonin compared with placebo (FBF, 2.4±0.2 vs. 1.9±0.1 ml·100 ml(-1)·min(-1); and FVC, 0.029±0.003 vs. 0.023±0.002 arbitrary units, respectively). Melatonin did not alter cerebral blood flow measurements compared with placebo. Additionally, phentolamine (5-mg bolus) after melatonin reversed the decrease in RVC, suggesting that melatonin increases sympathetic outflow to the kidney to mediate renal vasoconstriction. In summary, exogenous melatonin differentially alters vascular blood flow in humans. These data suggest the complex nature of melatonin on the vasculature in humans.
Authors:
Jonathan S Cook; Charity L Sauder; Chester A Ray
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2010-12-10
Journal Detail:
Title:  American journal of physiology. Heart and circulatory physiology     Volume:  300     ISSN:  1522-1539     ISO Abbreviation:  Am. J. Physiol. Heart Circ. Physiol.     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-02-01     Completed Date:  2011-03-15     Revised Date:  2012-02-01    
Medline Journal Info:
Nlm Unique ID:  100901228     Medline TA:  Am J Physiol Heart Circ Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  H670-4     Citation Subset:  IM    
Affiliation:
Pennsylvania State Heart and Vascular Institute, Department of Cellular and Molecular Physiology, General Clinical Research Center, Pennsylvania State University College of Medicine, H047, 500 Univ. Dr., Hershey, PA 17033-2390, USA.
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MeSH Terms
Descriptor/Qualifier:
Adrenergic alpha-Antagonists / pharmacology
Adult
Blood Pressure / drug effects
Cerebrovascular Circulation / drug effects
Double-Blind Method
Echocardiography, Doppler
Female
Forearm / blood supply*
Heart Rate / drug effects
Humans
Male
Melatonin / pharmacology*
Phentolamine / pharmacology
Plethysmography
Regional Blood Flow / drug effects*
Renal Circulation / drug effects
Ultrasonography, Doppler, Transcranial
Grant Support
ID/Acronym/Agency:
P01-HL-077670/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
0/Adrenergic alpha-Antagonists; 50-60-2/Phentolamine; 73-31-4/Melatonin

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


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