Document Detail


Stress-induced behaviour in adult and old rats: effects of neonatal asphyxia, body temperature and chelation of iron.
MedLine Citation:
PMID:  17242470     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Perinatal asphyxia in mammals leads to iron accumulation in the brain, which results in delayed neurobehavioural disturbances, including impaired learning and abnormal alertness over their entire life span. The aim of this investigation was to verify our hypothesis that newborn rats, showing reduced normal body temperature, are protected against neurotoxicity of the asphyxia up to senescence. Alertness was studied in adult and old male Wistar rats after exposure to critical neonatal anoxia: (i) at physiological neonatal body temperature of 33 degrees C, (ii) at body temperature elevated to 37 degrees C, or (iii) at body temperature elevated to 39 degrees C (the thermal conditions remained unchanged both during anoxia and for 2 h postanoxia). To elucidate the effect of iron-dependent postanoxic oxidative damage to the brain, half of the group (iii) was injected with deferoxamine, a chelator of iron. Postanoxic behavioural disturbances were recorded in open-field, elevated plus-maze, and sudden silence tests when the rats reached the age of 12 and 24 months. Open-field stress-induced motor activity was reduced in rats subjected to neonatal anoxia under hyperthermic conditions. In contrast, these rats were hyperactive in the plus-maze test. Both the plus-maze and sudden silence tests show reduced alertness of these rats to external stimuli signalling potential dangers. The behavioural disturbances were prevented by body temperature of 33 degrees C and by administration of deferoxamine.
Authors:
J Rogalska; M Caputa; K Wentowska; A Nowakowska
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of physiology and pharmacology : an official journal of the Polish Physiological Society     Volume:  57 Suppl 8     ISSN:  1899-1505     ISO Abbreviation:  J. Physiol. Pharmacol.     Publication Date:  2006 Nov 
Date Detail:
Created Date:  2007-01-23     Completed Date:  2007-12-06     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9114501     Medline TA:  J Physiol Pharmacol     Country:  Poland    
Other Details:
Languages:  eng     Pagination:  17-34     Citation Subset:  IM    
Affiliation:
Department of Animal Physiology, Institute of General and Molecular Biology, N. Copernicus University, Toruń, Poland. rogal@biol.uni.torun.pl
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MeSH Terms
Descriptor/Qualifier:
Age Factors
Animals
Animals, Newborn
Asphyxia / metabolism,  physiopathology*
Behavior, Animal / physiology*
Body Temperature / physiology*
Brain / metabolism
Female
Iron / metabolism*
Male
Maze Learning
Motor Activity / physiology
Rats
Rats, Wistar
Stress, Physiological / metabolism,  physiopathology*
Chemical
Reg. No./Substance:
7439-89-6/Iron

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


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