Document Detail


Long-term synaptic plasticity is impaired in rats with lesions of the ventrolateral preoptic nucleus.
MedLine Citation:
PMID:  20128848     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Impairment of memory functions has been frequently reported in models of sleep deprivation. Similarly, hippocampal long-term synaptic plasticity has been shown to be sensitive to sleep loss caused by acute sleep restriction. However, such approaches are limited by the stressful nature of sleep deprivation, and because it is difficult to study long-term sleep restriction in animals. Here, we report the effects of chronic sleep loss on hippocampal long-term potentiation (LTP) in a rodent model of chronic partial sleep deprivation. We studied LTP of the Schaffer collateral-CA1 synapses in hippocampal slices prepared from rats with lesions of the ventrolateral preoptic nucleus (VLPO), which suffered reductions in total sleep time for several weeks after lesions. In slices prepared from VLPO-lesioned rats, LTP was impaired proportionally to the amount of sleep loss, and the decline in LTP followed a single exponential function over the amount of accumulated sleep debt. As compared with sham-lesioned controls, hippocampal slices from VLPO-lesioned rats showed a greater response to adenosine antagonists and greater paired-pulse facilitation (PPF). However, exogenous adenosine depressed evoked synaptic transmission and increased PPF in VLPO-lesioned and sham-lesioned rats by equal amounts, suggesting that the greater endogenous adenosine inhibitory tone in the VLPO-lesioned rats is associated with greater ligand accumulation rather than a change in adenosine receptor sensitivity or adenosine-mediated neurotransmitter release probability. LTP in VLPO-lesioned animals was partially restored by adenosine antagonists, suggesting that adenosine accumulation in VLPO-lesioned animals could account for some of the observed synaptic plasticity deficits.
Authors:
Elda Arrigoni; Jun Lu; Ramalingam Vetrivelan; Clifford B Saper
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, N.I.H., Extramural     Date:  2009-11-25
Journal Detail:
Title:  The European journal of neuroscience     Volume:  30     ISSN:  1460-9568     ISO Abbreviation:  Eur. J. Neurosci.     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2010-02-04     Completed Date:  2011-06-06     Revised Date:  2014-09-21    
Medline Journal Info:
Nlm Unique ID:  8918110     Medline TA:  Eur J Neurosci     Country:  France    
Other Details:
Languages:  eng     Pagination:  2112-20     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Electric Stimulation / methods
Electroencephalography
Electromyography
Excitatory Postsynaptic Potentials / drug effects,  physiology
Eye Movements / physiology
Hippocampus / cytology
Male
Neural Pathways / physiology
Neuronal Plasticity / drug effects,  physiology*
Preoptic Area / injuries*,  physiology*
Rats
Rats, Sprague-Dawley
Receptor, Adenosine A1 / antagonists & inhibitors
Sleep / physiology
Synapses / drug effects,  physiology*
Wakefulness / physiology
Xanthines / pharmacology
Grant Support
ID/Acronym/Agency:
P50 HL060292/HL/NHLBI NIH HHS; P50 HL060292-010003/HL/NHLBI NIH HHS; P50 HL060292-020003/HL/NHLBI NIH HHS; P50 HL060292-030003/HL/NHLBI NIH HHS; P50 HL060292-040003/HL/NHLBI NIH HHS; P50 HL060292-050003/HL/NHLBI NIH HHS; P50-HL60292/HL/NHLBI NIH HHS; R01 NS061863/NS/NINDS NIH HHS; R01 NS061863-01A1/NS/NINDS NIH HHS; R01NS061863/NS/NINDS NIH HHS
Chemical
Reg. No./Substance:
0/Receptor, Adenosine A1; 0/Xanthines; 102146-07-6/1,3-dipropyl-8-cyclopentylxanthine
Comments/Corrections

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