Linked Life Data

16600512

Source:http://linkedlifedata.com/resource/pubmed/id/16600512

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2006-5-8
pubmed:abstractText
The basolateral amygdala and portions of the "extended" amygdala (i.e. central nucleus of the amygdala, bed nucleus of the stria terminalis and shell of the nucleus accumbens) have been implicated in the aversive aspects of withdrawal from chronic opiate administration. Given that similar withdrawal signs are observed following a single opiate exposure, these structures may also play a role in "acute opiate dependence." In the current study, drug-naïve rats underwent naloxone-precipitated withdrawal from acute morphine (10 mg/kg) exposure on two successive days. On either the first or second day of testing, the basolateral amygdala, central nucleus of the amygdala, bed nucleus of the stria terminalis, or nucleus accumbens was temporarily inactivated immediately prior to naloxone injection by microinfusion of the glutamatergic alpha-amino-3-hydroxy-5-methyl-4-isoxazole proprionic acid receptor antagonist 1,2,3,4-tetrahydro-6-nitro-2,3-dioxo-benzo(f)quinoxaline-7-sulfonamide (3 microg/0.5 microl). On the first day, inactivation of the basolateral amygdala, central nucleus of the amygdala, or bed nucleus of the stria terminalis, but not the nucleus accumbens blocked withdrawal-potentiated startle, a behavioral measure of the anxiogenic effects of withdrawal. On the second day, inactivation of the nucleus accumbens, but not the basolateral amygdala, central nucleus of the amygdala, or bed nucleus of the stria terminalis disrupted the withdrawal effect. Effects of structural inactivations on withdrawal-potentiated startle were not influenced by differences in withdrawal severity on the two days of testing. A fear-potentiated startle procedure provided functional confirmation of correct cannulae placement in basolateral amygdale- and central nucleus of the amygdala-implanted animals. Our findings indicate a double dissociation in the neural substrates of withdrawal-potentiated startle following a first versus second morphine exposure, and may reflect a reorganization of the neural circuitry underlying the expression of withdrawal-induced negative affect during the earliest stages of opiate dependence.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0306-4522
pubmed:author
pubmed:issnType
Print
pubmed:volume
139
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1201-10
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed-meshheading:16600512-Acoustic Stimulation, pubmed-meshheading:16600512-Amygdala, pubmed-meshheading:16600512-Analysis of Variance, pubmed-meshheading:16600512-Animals, pubmed-meshheading:16600512-Behavior, Animal, pubmed-meshheading:16600512-Drug Interactions, pubmed-meshheading:16600512-Excitatory Amino Acid Antagonists, pubmed-meshheading:16600512-Fear, pubmed-meshheading:16600512-Male, pubmed-meshheading:16600512-Morphine, pubmed-meshheading:16600512-Naloxone, pubmed-meshheading:16600512-Narcotic Antagonists, pubmed-meshheading:16600512-Narcotics, pubmed-meshheading:16600512-Nucleus Accumbens, pubmed-meshheading:16600512-Opioid-Related Disorders, pubmed-meshheading:16600512-Quinoxalines, pubmed-meshheading:16600512-Rats, pubmed-meshheading:16600512-Rats, Sprague-Dawley, pubmed-meshheading:16600512-Startle Reaction
pubmed:year
2006
pubmed:articleTitle
Double dissociation in the neural substrates of acute opiate dependence as measured by withdrawal-potentiated startle.
pubmed:affiliation
Department of Psychology, University of Minnesota, Minneapolis, 55455, USA.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural