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Does exposure to chronic stress influence blood pressure in rats?
MedLine Citation:
PMID:  23721955     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The principal aim of this study was to determine whether prolonged chronic footshock stress can evoke sustained changes in blood pressure in rats and to elucidate possible underlying neurochemical mechanisms as mediated by the sympathoadrenal system. Adult male Wistar rats instrumented for telemetric recording of arterial pressure, heart rate and locomotor activity were subjected to six weeks of inescapable unpredictable electrical footshocks (FS+) or were exposed to shock chambers but were not shocked (FS-). Compared to FS- animals, FS+ animals had significantly reduced body weight gain (by 30%), locomotor activity (by 25%) and social interaction time (by 30%) - symptoms commonly induced by chronic stress and depression in humans. These changes were associated with small, but significant increases in systolic blood pressure (by 7%) and pulse pressure (by 11%) in FS+ rats relative to FS- rats. We have also found neurochemical alterations in sympathoadrenal pathways (that lasted for at least one week post-stress) including about 2-3 fold increases in the levels of tyrosine hydroxylase phosphorylation in the sympathetic ganglia and adrenal gland and a 1.8-fold increase in the expression of the Angiotensin II receptor type 1 protein in the adrenal gland of FS+ rats relative to FS- rats. We conclude that uncontrollable and unpredictable footshock stress can lead to elevation in systolic blood pressure when applied for an extended period of time (six weeks) in Wistar rats, and that these changes could be mediated by stress-induced modifications in sympathoadrenal pathways.
Authors:
Larisa Bobrovskaya; Daniel Beard; Evgeny Bondarenko; Mirza I Beig; Phillip Jobling; Frederick R Walker; Trevor A Day; Eugene Nalivaiko
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-5-27
Journal Detail:
Title:  Autonomic neuroscience : basic & clinical     Volume:  -     ISSN:  1872-7484     ISO Abbreviation:  Auton Neurosci     Publication Date:  2013 May 
Date Detail:
Created Date:  2013-5-31     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100909359     Medline TA:  Auton Neurosci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013. Published by Elsevier B.V.
Affiliation:
School of Biomedical Sciences and Pharmacy, Hunter Medical Research Institute, University of Newcastle, Callaghan, NSW, Australia. Electronic address: Larisa.Bobrovskaya@unisa.edu.au.
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